CN114948290A - Shell-like dental instrument - Google Patents

Abstract

The invention discloses a shell-shaped dental appliance, which comprises an appliance body and an accessory, wherein a cavity for accommodating teeth is formed in the appliance body, the appliance body is provided with a first matching part, the accessory is provided with a second matching part, the shell-shaped dental appliance also comprises a connecting part for connecting the first matching part and the second matching part, two of the first matching part, the second matching part and the connecting part form a limiting part which is mutually limited in a first direction, and the first direction is the direction of the appliance body towards the accessory. The appliance body and the accessories of the invention realize double retention through the connecting part and the limiting part, and can effectively enhance the connecting strength and the connecting reliability between the appliance body and the accessories, thereby reducing the risk of falling off of the accessories.

Description

Shell-like dental instrument

Technical Field

The invention relates to the technical field of tooth correction, in particular to a shell-shaped dental appliance.

Background

Shell-like dental instruments made of polymeric materials are becoming more and more popular due to their advantages of aesthetic appearance, convenience, and cleaning benefits. In general, orthodontic treatment using shell dental appliances requires a series of successive shell dental appliances, each of which has a tooth-receiving cavity with a geometry that substantially matches the tooth arrangement desired for the corresponding corrective step.

In many cases, it is difficult to ensure that a proper force system is applied to teeth by simply relying on the shell-shaped dental appliance, for example, in order to achieve the functions of traction, guiding the lower jaw forward, opening occlusion, etc., the current shell-shaped dental appliance includes an appliance body for accommodating teeth and an accessory combined to the appliance body, but the connection strength between the accessory and the appliance body is limited, and the risk of falling off of the accessory during clinical use is high.

Disclosure of Invention

The invention aims to provide a shell-shaped dental appliance which can enhance the connection strength and the connection reliability between an accessory and an appliance body and further reduce the risk of falling off of the accessory.

In order to achieve one of the above objects, an embodiment of the present invention provides a shell-shaped dental appliance, including an appliance body forming a cavity for accommodating a tooth, and an attachment, wherein the appliance body has a first matching portion, the attachment has a second matching portion, the shell-shaped dental appliance further includes a connecting portion connecting the first matching portion and the second matching portion, two of the first matching portion, the second matching portion and the connecting portion form a limiting portion for limiting each other in a first direction, and the first direction is a direction of the appliance body toward the attachment.

As a further improvement of an embodiment of the present invention, the connecting portion is a glue joint portion or a welding portion.

As a further improvement of an embodiment of the present invention, the connecting portion is at least filled in the stopper portion.

As a further improvement of an embodiment of the present invention, the position-limiting portion includes a groove and a protrusion that are engaged with each other.

As a further development of an embodiment of the invention, the inner contour of the recess and the outer contour of the projection match each other.

As a further improvement of an embodiment of the present invention, the cross section of the protrusion has an inverted trapezoidal shape, a mushroom shape, or a screw shape.

As a further improvement of the embodiment of the present invention, the groove is located in one of the first matching portion and the second matching portion, and the protrusion is located in the other of the first matching portion and the second matching portion.

As a further improvement of an embodiment of the present invention, the connecting portion is at least filled in a gap formed by the matching of the groove and the protrusion.

As a further improvement of the embodiment of the present invention, the groove is located on one of the first matching portion and the connecting portion, and the protrusion is located on the other of the first matching portion and the connecting portion.

As a further improvement of an embodiment of the present invention, the second engaging portion and the connecting portion are engaged with each other in a flat manner or in a concave-convex manner.

As a further improvement of an embodiment of the present invention, a cross section of the protrusion is in an inverted trapezoid shape or a trapezoid shape, the limiting portion includes a first included angle between a lower bottom and a waist, and the first included angle is an acute angle.

As a further improvement of an embodiment of the present invention, the first included angle ranges from 60 ° to 80 °.

As a further improvement of an embodiment of the present invention, the stopper portion is formed between the second fitting portion and the connecting portion.

As a further improvement of an embodiment of the present invention, the appliance body includes a cavity matching with the teeth and a first mating portion protruding out of the cavity, the first mating portion includes a cavity communicating with the cavity, and the groove is located in the cavity.

As a further improvement of the embodiment of the present invention, the groove is located on one of the second matching portion and the connecting portion, and the protrusion is located on the other of the second matching portion and the connecting portion.

As a further improvement of an embodiment of the present invention, the first engaging portion and the connecting portion are engaged with each other in a flat manner or in a concave-convex manner.

As a further improvement of an embodiment of the present invention, the limiting portion includes a hook and an opening that are matched with each other, the hook includes a hook portion, and the hook portion and an edge of the opening limit each other.

As a further improvement of the embodiment of the present invention, the hook is located at one of the first matching portion and the second matching portion, and the opening is located at the other of the first matching portion and the second matching portion.

As a further improvement of an embodiment of the present invention, the connecting portion is at least filled in a space formed by the hook portion and an edge of the opening in cooperation.

As a further improvement of the embodiment of the invention, the appliance body includes a cavity matching with the teeth and a first matching portion protruding out of the cavity, the first matching portion includes a cavity communicating with the cavity and the opening communicating with the cavity, and the hook passes through the opening and extends into the cavity.

As a further improvement of an embodiment of the present invention, the hook is located at the connecting portion, and the opening is located at the second matching portion.

As a further improvement of the embodiment of the invention, the attachment includes a lower surface close to the appliance body and an upper surface far from the appliance body, the opening penetrates through the lower surface and the upper surface, and the connecting portion penetrates through the opening and extends to the upper surface to form the hook.

As a further improvement of an embodiment of the present invention, the upper surface has a recessed portion communicating with the opening, and the hook is located in the recessed portion.

In a further improvement of an embodiment of the present invention, the connecting portion is a glue portion or a welding portion filled in the opening and the upper surface.

As a further improvement of an embodiment of the present invention, a gap is provided between the lower surface and the first fitting portion, and the connecting portion extends into the gap.

As a further improvement of an embodiment of the present invention, the connecting portion includes a supporting portion and a solder retention point connected to each other, the supporting portion passes through the opening, and the solder retention point is formed on the upper surface as the hook by a welding process.

As a further improvement of an embodiment of the present invention, the welding process is ultrasonic welding, laser welding, electrothermal fusion welding, friction welding, impulse welding or infrared welding.

As a further improvement of an embodiment of the present invention, the connecting portion is integrally formed with the appliance body.

As a further improvement of one embodiment of the invention, the appliance body comprises an inner surface close to the cavity, an outer surface far away from the cavity and an opening penetrating through the inner surface and the outer surface, the connecting part penetrates through the opening and forms another welding point on the inner surface, and the welding point is formed by a welding process.

As a further improvement of an embodiment of the present invention, the hook is located at the connecting portion, and the opening is located at the first matching portion.

As a further improvement of an embodiment of the invention, the appliance body includes an inner surface close to the cavity and an outer surface far from the cavity, the opening penetrates through the inner surface and the outer surface, and the connecting portion penetrates through the opening and extends to the inner surface to serve as the hook.

In a further improvement of an embodiment of the present invention, the connecting portion is a glue portion or a welding portion filled in the opening and the inner surface.

As a further improvement of an embodiment of the present invention, a gap is provided between the outer surface and the attachment, and the connecting portion extends into the gap.

As a further improvement of an embodiment of the present invention, the connecting portion includes a supporting portion and a welding point, the supporting portion passes through the opening, and the welding point is formed on the inner surface by a welding process to form the hook.

As a further improvement of the embodiment of the present invention, the first matching portion is integrally formed on the appliance body, and the second matching portion is integrally formed on the attachment.

As a further improvement of an embodiment of the invention, the attachment is located at a partial region of the appliance body, and the second mating portion and the first mating portion are configured to: the second matching part is inserted into the first matching part along a second direction, and a second included angle between the second direction and the first direction is an acute angle or a right angle.

As a further improvement of an embodiment of the present invention, the second included angle ranges from 60 ° to 90 °.

As a further improvement of one embodiment of the invention, the attachment is located on a buccal surface, a lingual surface or an occlusal surface of the appliance body.

As a further improvement of an embodiment of the invention, the accessory is a traction button, a bracket, a jaw pad, a bi-mandibular plate, a flat guide plate or a reinforcement rib.

Compared with the prior art, the beneficial effects of the embodiment of the invention are as follows: according to the appliance body and the accessories in the embodiment of the invention, double retention is realized through the connecting part and the limiting part, so that the connecting strength and the connecting reliability between the appliance body and the accessories can be effectively enhanced, and the falling risk of the accessories is further reduced.

Drawings

FIG. 1 is a schematic view of a shell-like dental instrument according to a first example of the present invention;

FIG. 2 is a schematic view of a second exemplary shell-like dental implement of the present invention;

FIG. 3 is a schematic view of a shell-like dental instrument according to a third example of the present invention;

FIG. 4 is a schematic view of a shell-like dental instrument according to a fourth example of the present invention;

FIG. 5 is a schematic view of a shell-like dental implement according to a fifth example of the present invention;

FIG. 6 is a schematic view of a shell-like dental implement according to a sixth example of the present invention;

FIG. 7 is a schematic view of a shell-like dental implement according to a seventh example of the present invention;

FIG. 8 is a schematic view of a shell-like dental implement according to an eighth example of the present invention;

FIG. 9 is a schematic view of a shell-like dental implement according to a ninth example of the present invention;

FIG. 10 is a schematic view of a shell-like dental implement according to a tenth example of the present invention;

FIG. 11 is a schematic view of a shell-like dental implement according to an eleventh example of the present invention;

FIG. 12 is a schematic view of a shell-like dental implement according to a twelfth example of the present invention;

FIG. 13 is a schematic view of a shell-like dental implement according to a thirteenth example of the present invention;

FIG. 14 is a schematic view of a shell-like dental instrument according to a fourteenth example of the present invention;

FIG. 15 is a schematic view of a shell-like dental implement according to a fifteenth example of the present invention;

FIG. 16 is a schematic view of a shell-like dental implement according to a sixteenth example of the present invention;

FIG. 17 is a schematic view of a shell-like dental implement according to a seventeenth example of the present invention;

FIG. 18 is a schematic view of a shell-like dental implement according to an eighteenth example of the present invention;

FIG. 19 is a schematic view of a shell-like dental implement according to a nineteenth example of the present invention;

FIG. 20 is a schematic view of a shell-like dental instrument (with the attachment not fully seated) according to a twentieth example of the present invention;

FIG. 21 is a schematic view of a shell-like dental instrument (with the attachment fully seated) according to a twentieth example of the present invention;

FIG. 22 is a schematic view of a shell-like dental instrument (with an accessory not fully seated) according to a twenty-first example of the present invention;

FIG. 23 is a schematic view of a shell-like dental instrument (with the attachment fully seated) according to a twenty-first example of the present invention;

FIG. 24 is a schematic view of a shell-like dental instrument according to a twenty-second example of the present invention;

FIG. 25 is a schematic view of a shell-like dental instrument (with the attachment not fully seated) according to a twenty-third example of the invention;

FIG. 26 is a schematic view of a shell-like dental instrument (with the attachment fully seated) according to a twenty-third example of the invention;

FIG. 27 is a schematic view of a shell-like dental instrument according to a twenty-fourth example of the present invention;

FIG. 28 is a schematic view of a shell-like dental implement according to other embodiments of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes in accordance with the embodiments are within the scope of the present invention.

Referring to fig. 1, one embodiment of the present invention provides a shell-like dental instrument 100.

Shell-like dental appliance 100 includes an appliance body 10 forming a cavity S for receiving a tooth and an attachment 20.

The appliance body 10 has a first matching portion 11, the attachment 20 has a second matching portion 21, the shell-shaped dental appliance 100 further includes a connecting portion 30 connecting the first matching portion 11 and the second matching portion 21, two of the first matching portion 11, the second matching portion 21 and the connecting portion 30 form a limiting portion a limiting each other in a first direction X, and the first direction X is a direction of the appliance body 10 toward the attachment 20.

Here, the connecting portion 30 is a separate member from the first engaging portion 11 and the second engaging portion 21, and the connecting portion 30 connects the first engaging portion 11 and the second engaging portion 21 to fix the appliance body 10 and the attachment 20 to each other.

In addition, the phrase "two of the first engaging portion 11, the second engaging portion 21 and the connecting portion 30 form a limiting portion a limiting each other in the first direction X" means that the forming position of the limiting portion a may include the following situations: the first case is that the stopper portion a is formed at least in a partial region between the first fitting portion 11 and the second fitting portion 21, the second case is that the stopper portion a is formed at least in a partial region between the first fitting portion 11 and the connecting portion 30, and the third case is that the stopper portion a is formed at least in a partial region between the second fitting portion 21 and the connecting portion 30, which may be regarded as mechanical retention that restricts the appliance body 10 and the attachment 20 from separating from each other in the first direction a by restricting each other in the first direction X.

It should be noted that one or more of the three situations may be included in the matching structure of the set of the first matching portion 11, the second matching portion 21 and the connecting portion 30, that is, one limiting portion a or a plurality of limiting portions a may be included in the matching structure of the set of the first matching portion 11, the second matching portion 21 and the connecting portion 30.

It can be seen that, in the present embodiment, the appliance body 10 and the attachment 20 are retained by the connecting portion 30 and the limiting portion a, so that the connection strength and the connection reliability between the appliance body 10 and the attachment 20 can be effectively enhanced, and the risk of dropping the attachment 20 can be further reduced.

In the present embodiment, the connection portion 30 is a glue connection portion or a welding portion, and the connection portion 30 is filled in at least the stopper portion a.

Here, the adhesive portion or the soldering portion refers to a structure having certain fluidity and flexibility, the adhesive portion is, for example, a solidified adhesive, and the soldering portion is, for example, a solder.

It can be understood that the position-limiting portion a can achieve mechanical retention, the glue-connecting portion or the welding portion can achieve glue-connecting retention or welding retention, respectively, and the connection strength and the connection reliability between the appliance body 10 and the attachment 20 can be effectively enhanced through the double retention of the mechanical retention and the glue-connecting retention or the welding retention.

Specifically, taking the connection portion 30 as the glue connection portion as an example, since the glue connection portion has good flexibility, the mechanical retention position is retained by glue, so as to realize flexible combination of materials at the mechanical retention position, and the retention strength between the appliance body 10 and the attachment 20 can be effectively enhanced.

In addition, due to the fluidity of the glue retention, the edge of the glue retention is prone to stress concentration, and the mechanical retention of the present embodiment can weaken the fluidity and avoid the stress concentration at the edge of the glue retention, so that the glue force can be uniformly distributed on the whole glue portion, thereby significantly enhancing the connection strength and the connection reliability between the appliance body 10 and the attachment 20.

For the description of the connecting portion 30 as a welding portion, reference may be made to the description of the glue-bonding portion, and the description thereof is omitted here.

In the present embodiment, the attachment 20 is a traction button, a bracket, a jaw pad, a double jaw plate, a flat guide plate, a reinforcing rib, or the like, but not limited thereto.

The attachment 20 is located in a localized area of the appliance body 10 such that the attachment 20 is not oversized to facilitate installation of the attachment 20 with the detents a.

Specifically, the attachment 20 may be located on the buccal, lingual or occlusal surface of the appliance body 10.

Here, the second fitting portion 21 and the first fitting portion 11 are configured to: the second engaging portion 21 is inserted into the first engaging portion 11 along a second direction, and a second included angle between the second direction and the first direction X is an acute angle or a right angle, and preferably, the second included angle ranges from 60 ° to 90 °.

At this time, the second matching portion 21 and the first matching portion 11 are pre-installed in an inserting manner, and the second matching portion 21 and the first matching portion 11 can be further fixed by the connecting portion 30, or of course, the connecting portion 30 may be formed at the second matching portion 21 or the first matching portion 11, and then the second matching portion 21 and the first matching portion 11 are matched in an inserting manner.

The second direction is, for example, a direction in which a buccal surface of the appliance body 10 faces a lingual surface, or a mesial-distal direction of the appliance body 10, in which case the second fitting portion 21 is laterally inserted into the first fitting portion 11, but the second direction may also have a certain inclination with respect to the direction in which the buccal surface faces the lingual surface (or the mesial-distal direction), and is different from the first direction X.

It will be appreciated that, in consideration of the shape characteristics of some of the attachments 20, there may be a risk of the first fitting portion 11 or the second fitting portion 21 being damaged by a force when the attachments 20 are installed in the first direction X, so that the installation of the attachments 20 in the second direction different from the first direction X can avoid such a risk, greatly improving the convenience and stability of installation.

The first engaging portion 11 is integrally formed on the appliance body 10, that is, the first engaging portion 11 is a part of the appliance body 10, but not limited thereto, the first engaging portion 11 may also be a structure independent of the appliance body 10, and the first engaging portion 11 and the appliance body 10 are assembled with each other.

The second matching portion 21 is integrally formed on the accessory 20, that is, the second matching portion 21 is a part of the accessory 20, but not limited thereto, the second matching portion 21 may be a structure independent from the accessory 20, and the second matching portion 21 and the accessory 20 are assembled with each other.

Several embodiments of shell-like dental instrument 100 are described below, and like or similar structures are identified with like or similar reference numerals and designations for purposes of illustration.

In the first embodiment, referring to fig. 1, the stopper portion a is formed at least in a partial region between the first fitting portion 11 and the second fitting portion 21.

The position-limiting portion a includes a groove a1 and a protrusion a2, which are engaged with each other, the groove a1 is located in one of the first engaging portion 11 and the second engaging portion 21, and the protrusion a2 is located in the other of the first engaging portion 11 and the second engaging portion 21.

When a force is applied to the attachment 20 along the first direction X, the limiting portion a limits the attachment 20 from being separated from the appliance body 10 along the first direction X.

The inner contour of the groove A1 and the outer contour of the protrusion A2 are matched with each other, a gap A3 is formed between the groove A1 and the protrusion A2 in a matching manner, the connecting part 30 is at least filled in the gap A3, in the embodiment, the connecting part 30 is further filled in the extending gap A4 around the gap A3, and therefore the connecting strength of the appliance body 10 and the attachment 20 is further improved.

With reference to fig. 1 to 7, the shapes and the arrangement positions of the grooves a1 and the protrusions a2 have various examples.

Referring to FIG. 1, a schematic illustration of a first exemplary shell-like dental instrument 100 is shown.

The attachment 20 is located on the occlusal surface B1 of the appliance body 10, the limiting portion a is formed between the first matching portion 11 and the second matching portion 21, the groove a1 is located on the second matching portion 21, the protrusion a2 is located on the first matching portion 11, the cross section of the protrusion a2 is trapezoidal, and the connecting portion 30 is filled in the gap A3 and the extending gap a 4.

Here, the "section of the projection a 2" is a section of the projection a2 in the first direction X, the same applies below.

In addition, the limiting part A comprises a first included angle alpha 1 between the lower bottom and the waist of the trapezoid, and the first included angle alpha 1 is an acute angle, so that the groove A1 and the protrusion A2 can be prevented from being separated from each other along the first direction X.

Preferably, the first included angle α 1 ranges from 60 ° to 80 °.

It can be understood that if the first included angle α 1 is too large (e.g. close to 90 °), a good limiting effect cannot be achieved, and if the first included angle α 1 is too large (e.g. close to 0 °), in order to ensure that the protrusion a2 has a certain height in the first direction X, the protrusion a2 needs to be very wide in the mesial-distal direction, which not only occupies a lot of space, but also greatly affects the assembly of the protrusion a2 and the groove a1, so the first included angle α 1 is defined in the range of 60 ° to 80 °.

Of course, when the cross section of the protrusion a2 is inverted trapezoid, the first included angle α 1 as described above exists, and will not be described in detail below.

In fig. 1, since the connection portion 30 is formed in the notch a21 at the edge of the protrusion a2, the connection portion 30 and the notch a21 are restricted from each other in the first direction X, that is, the restriction portion a is also provided between the connection portion 30 and the first engagement portion 11.

Similarly, since the connecting portion 30 is formed in the notch a11 of the groove a1, the connecting portion 30 is limited from the notch a11 in the first direction X, i.e., it can be considered that the connecting portion 30 and the second mating portion 12 have the limiting portion a therebetween.

In addition, in the first example, the accessory 20 may be installed by being inserted laterally, or the groove a1 or the protrusion a2 may be slightly deformed to install the accessory 20, and the connecting portion 30 may be previously disposed in the groove a1 or the protrusion a2, or the connecting portion 30 may be formed in the gap A3 and the extending gap a4 after the accessory 20 is installed.

Referring to FIG. 2, a second exemplary shell-like dental implement 100a is illustrated.

The second example differs from the first example mainly in that: the cross section of the bulge A2 is mushroom-shaped, and at the moment, the limiting area can be properly enlarged to improve the limiting effect of the limiting part A.

For other descriptions of the second example, reference may be made to the first example, which is not described herein again.

Referring to fig. 3, a third exemplary shell-like dental implement 100b is illustrated.

The main differences between the third example and the first example are: the cross section of the protrusion a2 is threaded, at this time, the groove a1 can be matched with the protrusion a2 in a threaded manner, and the limiting area of the third example is relatively large, so as to improve the limiting effect of the limiting part a.

For other descriptions of the third example, reference may be made to the first example, which is not described herein again.

Referring to fig. 4, a fourth exemplary shell-like dental implement 100c is illustrated.

The fourth example differs from the first example mainly in that: the arrangement positions of the groove A1 and the protrusion A2 are interchanged, namely, the groove A1 is positioned at the first matching part 11, the protrusion A2 is positioned at the second matching part 21, and the cross section of the protrusion A2 is in an inverted trapezoid shape.

In the fourth example, the appliance body 10c includes a cavity S matching with the teeth and a first fitting part 11c protruding out of the cavity S, the first fitting part 11c includes a cavity S1 communicating with the cavity S, and the groove a1 is located in the cavity S1.

Here, the first fitting portion 11c is defined as a portion protruding out of the cavity S, i.e., the first fitting portion 11c does not contact or press the teeth when the shell-shaped dental appliance 100c is worn on the teeth, and the groove a1 is located in the cavity S1, i.e., the groove a1 does not contact or press the teeth when the shell-shaped dental appliance 100c is worn on the teeth, avoiding the groove a1 from exerting an unintended force on the teeth.

Of course, when the protrusion a2 is located on the first matching part 11c, the first matching part 11c can also be arranged to protrude outwards from the cavity S, which can be determined according to practical situations.

For other descriptions of the fourth example, reference may be made to the first example, which is not described herein again.

Referring to FIG. 5, a fifth exemplary shell-like dental implement 100d is illustrated.

The main difference between the fifth example and the first example is that: the attachment 20d is located on the buccal surface B2 of the appliance body 10d, where the attachment 20d may be, for example, a tongue button, the recess A1 is located on the first mating portion 11d, and the protrusion A2 is located on the second mating portion 21 d.

For other descriptions of the fifth example, reference may be made to the first example, which is not described herein again.

Referring to fig. 6, a fifth exemplary shell-like dental implement 100e is illustrated.

The sixth example differs from the first example mainly in that: the attachment 20e is located on the buccal surface B2 of the appliance body 10e and the projection a2 is threaded in cross-section.

For other descriptions of the sixth example, reference may be made to the first example, which is not described herein again.

Referring to fig. 7, a seventh exemplary shell-like dental implement 100f is illustrated.

The main difference between the seventh example and the first example is that: the attachment 20f is located on the cheek surface B2 of the appliance body 10f, and the size of the groove a1 is made larger to improve the limiting strength of the limiting portion a.

In the second embodiment, referring to fig. 8, the stopper portion a is formed at least in a partial region between the first fitting portion 11g and the connecting portion 30 g.

The limiting part A comprises a groove A1 and a protrusion A2 which are matched with each other, the groove A1 is located in one of the first matching part 11g and the connecting part 30g, the protrusion A2 is located in the other one of the first matching part 11g and the connecting part 30g, the inner contour of the groove A1 is matched with the outer contour of the protrusion A2, the groove A1 is tightly attached to the protrusion A2, and no gap exists between the groove A1 and the protrusion A2.

That is, the present embodiment forms the stopper portion a directly at the groove a1 or the protrusion a2 by filling of the connection portion 30g, and the connection portion 30g plays a role of not only connecting the first fitting portion 11g and the second fitting portion 21g but also forming the stopper portion a.

When a force is applied to the attachment 20g along the first direction X, the stopper portion a restricts the attachment 20g from being separated from the appliance body 10g along the first direction X.

With reference to fig. 8 to 11, the shapes and the arrangement positions of the grooves a1 and the protrusions a2 are various examples.

Referring to fig. 8, a schematic view of an eighth exemplary shell-like dental instrument 100g is shown.

The accessory 20g is positioned on the occlusal surface B1 of the appliance body 10g, the limiting part A is formed between the first matching part 11g and the connecting part 30g, the groove A1 is positioned on the first matching part 11g, the protrusion A2 is positioned on the connecting part 30g, and the section of the protrusion A2 is in an inverted trapezoid shape.

At this time, since the connection part 30g is formed in the notch a11 of the groove a1, the connection part 30g and the notch a11 are restricted from each other in the first direction X, i.e., the connection part 30g and the first mating part 11g have a stopper part a therebetween.

The second engagement portion 21g of the present example has a boss a5, and in this case, the second engagement portion 21g and the connection portion 30g are engaged in a concavo-convex manner, but the stopper portion a is not formed between the second engagement portion 21g and the connection portion 30 g.

Here, the second fitting portion 21g having the projection a5 can increase the contact area between the second fitting portion 21g and the connection portion 30g, thereby improving the connection strength between the second fitting portion 21g and the connection portion 30 g.

Note that, like the fourth example, the first fitting portion 11g includes a chamber S1 communicating with the cavity S, and the groove a1 is located in the chamber S1.

Referring to fig. 9, a schematic view of a shell-like dental instrument 100h of the first example is shown.

The ninth example differs from the eighth example mainly in that: the arrangement positions of the groove A1 and the projection A2 are interchanged, namely, the groove A1 is positioned at the connecting part 30h, the projection A2 is positioned at the first matching part 11h, and the section of the projection A2 is trapezoidal.

In addition, the second engaging portion 21g of this example has an accommodating groove a6, the accommodating groove a6 is used for accommodating the connecting portion 30h and the protrusion a2, and at this time, the second engaging portion 21h and the connecting portion 30h are in concave-convex engagement, but a limiting portion a is not formed between the second engaging portion 21h and the connecting portion 30h, and the accommodating groove a6 is provided to reduce a gap between the attachment 20h and the appliance body 10h, so that the attachment 20h is more attached to the appliance body 10 h.

For other descriptions of the ninth example, refer to the eighth example, which is not described herein again.

Referring to fig. 10, a schematic view of a tenth example shell-like dental implement 100i is shown.

The tenth example differs from the eighth example mainly in that: the second engagement portion 21i has a receiving groove a6, and at this time, the second engagement portion 21i and the connection portion 30i are engaged in a concavo-convex manner, but the stopper portion a is not formed between the second engagement portion 21i and the connection portion 30 i.

For other descriptions of the tenth example, reference may be made to the eighth example, which is not described herein again.

Referring to fig. 11, a schematic view of an eleventh exemplary shell-like dental implement 100j is shown.

The main difference between the eleventh example and the eighth example is that: the second matching part 21j is matched with the connecting part 30j in a plane mode, and therefore the forming and mounting process of the accessory 20j can be simplified.

For other descriptions of the eleventh example, reference may be made to the eighth example, which is not described herein again.

Referring to fig. 12, a twelfth example shell-like dental implement 100k is shown.

The twelfth example differs from the eighth example mainly in that: the attachment 20k is located on the buccal surface B2 of the appliance body 10k, in which case the attachment 20k may be, for example, a tongue and the second mating portion 21k is a planar mating with the connecting portion 30 k.

For other descriptions of the twelfth example, reference may be made to the eighth example, which is not described herein again.

In the third embodiment, in conjunction with fig. 13, the stopper portion a is formed at least in a partial region between the second fitting portion 21m and the connecting portion 30 m.

The limiting part A comprises a groove A1 and a protrusion A2 which are mutually matched, the groove A1 is positioned at one of the second matching part 21m and the connecting part 30m, the protrusion A2 is positioned at the other one of the second matching part 21m and the connecting part 30m, the inner contour of the groove A1 is mutually matched with the outer contour of the protrusion A2, the groove A1 is tightly attached to the protrusion A2, and no gap exists between the groove A1 and the protrusion A2.

That is, the present embodiment forms the stopper portion a directly at the groove a1 or the protrusion a2 by filling of the connection portion 30m, and the connection portion 30m plays a role of not only connecting the first fitting portion 11m and the second fitting portion 21m but also forming the stopper portion a.

When a force is applied to the attachment 20m along the first direction X, the stopper portion a restricts the attachment 20m from being separated from the appliance body 10m along the first direction X.

Specifically, referring to fig. 13, a schematic view of a thirteenth exemplary shell-like dental implement 100m is shown.

The attachment 20m is positioned on the occlusal surface B1 of the appliance body 10m, the limiting part A is formed between the second matching part 21m and the connecting part 30m, the groove A1 is positioned on the second matching part 21m, the protrusion A2 is positioned on the connecting part 30m, and the cross section of the protrusion A2 is trapezoidal.

At this time, since the connection part 30m is formed in the notch a11 of the groove a1, the connection part 30m and the notch a11 are restricted from each other in the first direction X, i.e., the connection part 30m and the second mating part 21m have a stopper part a therebetween.

The first engagement portion 11m in this example has a boss a5, and in this case, the first engagement portion 21m and the connection portion 30m are engaged with each other in a concavo-convex manner, but the stopper portion a is not formed between the first engagement portion 21m and the connection portion 30 m.

In the fourth embodiment, referring to fig. 14, the stopper portion a is formed in at least a partial region between the first fitting portion 11n and the connecting portion 30n, and the stopper portion a is formed in at least a partial region between the second fitting portion 21n and the connecting portion 30 n.

That is, the shell-shaped dental instrument 100n of the present embodiment includes a first stopper portion a and a second stopper portion a', the first stopper portion a includes a first groove a1 and a first protrusion a2 that are engaged with each other, the first groove a1 is located in one of the first engaging portion 11n and the connecting portion 30n, the first protrusion a2 is located in the other of the first engaging portion 11n and the connecting portion 30n, an inner contour of the first groove a1 is engaged with an outer contour of the first protrusion a2, the first groove a1 is tightly attached to the first protrusion a2, and there is no gap between the first groove a1 and the first protrusion a 2.

The second position-limiting portion a ' includes a second groove a1 ' and a second protrusion a2 ' that are engaged with each other, the second groove a1 ' is located in one of the second engaging portion 21n and the connecting portion 30n, the second protrusion a2 ' is located in the other of the second engaging portion 21n and the connecting portion 30n, an inner contour of the second groove a1 ' is engaged with an outer contour of the second protrusion a2 ', and the second groove a1 ' fits tightly against the second protrusion a2 ', and there is no gap between the second groove a1 ' and the second protrusion a2 '.

That is, in the present embodiment, the first stopper portion a and the second stopper portion a 'are formed between the first engagement portion 11n and the connection portion 30n and between the second engagement portion 21n and the connection portion 30n by filling the connection portion 30n, and the connection portion 30n not only functions to connect the first engagement portion 11n and the second engagement portion 21n but also functions to form the first stopper portion a and the second stopper portion a'.

When a force is applied to the attachment 20n along the first direction X, the first limiting portion a and the second limiting portion a' limit the attachment 20n from separating from the appliance body 10n along the first direction X.

Specifically, referring to fig. 14, a fourteenth exemplary shell-like dental implement 100n is illustrated.

The appendage 20n is positioned at occlusal surface B1 of the appliance body 10 n.

The first limiting part a is formed between the first matching part 11n and the connecting part 30n, the first groove a1 is located in the first matching part 11n, the first protrusion a2 is located in the connecting part 30n, and the cross section of the first protrusion a2 is in an inverted trapezoid shape.

The second stopper portion a ' is formed between the second engagement portion 21n and the connection portion 30n, the second groove a1 ' is located at the second engagement portion 21n ', the second protrusion a2 ' is located at the connection portion 30n, and the second protrusion a2 ' has a trapezoidal cross-section.

At this time, since the connection part 30n is formed in the first notch a11 of the first groove a1, the connection part 30n and the first notch a11 limit each other in the first direction X, i.e., the connection part 30n and the first fitting part 11n have a first limit part a therebetween.

In addition, since the connection part 30n is formed in the second notch a11 'of the second groove a 1', the connection part 30n and the second notch a11 'are restricted from each other in the first direction X, i.e., there is a second restriction part a' between the connection part 30n and the second mating part 21 n.

The connection portion 30n of the present example also fills into the extension gap a 4.

In the fifth embodiment, referring to fig. 15, the stopper portion a is formed at least in a partial region between the first engagement portion 11p and the second engagement portion 21 p.

The limiting part A comprises a hook A7 and an opening A8 which are matched with each other, the hook A7 comprises a hook part A71, and the hook part A71 and the edge A81 of the opening A8 limit each other.

The hook a7 is located on one of the first mating portion 11p and the second mating portion 21p, and the opening A8 is located on the other of the first mating portion 11p and the second mating portion 21 p.

When a force is applied to the attachment 20p in the first direction X, the stopper portion a restricts the attachment 20p from being detached from the appliance body 10p in the first direction X.

The hook A71 of the hook A7 is spaced apart from the edge A81 of the opening A8 by a distance A9, and the connecting portion 30p is filled at least in the distance A9.

With reference to fig. 15 to 18, the shapes and the arrangement positions of the hook a7 and the opening A8 are various examples.

Referring to fig. 15, a fifteenth example of a shell-like dental implement 100p is illustrated.

The attachment 20p is located on the occlusal surface B1 of the appliance body 10p, the stopper a is formed between the first fitting portion 11p and the second fitting portion 21p, the hook a7 is located on the second fitting portion 21p, and the opening a8 is located on the first fitting portion 11 p.

Specifically, the appliance body 10p includes a cavity S matching with the teeth and a first matching portion 11p protruding out of the cavity S, the first matching portion 11p includes a cavity S1 communicating with the cavity S and an opening a8 communicating with the cavity S1, and the hook a7 extends into the cavity S1 through the opening a 8.

Here, the first mating portion 11p is defined as a portion protruding out of the cavity S, i.e., the first mating portion 11p does not contact or press the tooth when the shell-shaped dental appliance 100p is worn on the tooth, and the hook a7 is located in the cavity S1, i.e., the hook a7 does not contact or press the tooth when the shell-shaped dental appliance 100p is worn on the tooth, so as to prevent the hook a7 from exerting an unintended force on the tooth.

The hook A7 comprises two opposite hooks A71, a gap is formed between the two hooks A71, the hook A7 is convenient to deform and penetrate through the same opening A8, and the two hooks A71 extend in the direction away from each other.

The edge a81 of the opening A8 includes an inner surface a811 proximate to the cavity S1 and an outer surface a812 distal from the cavity S1, the inner surface a811 and the two hooks a71 each form a spacing a9 therebetween, and the outer surface a812 and a side surface of the attachment 20p proximate to the appliance body 10p form an extended spacing a10 therebetween, and the connecting portion 30p fills the spacing a9 and the extended spacing a 10.

Referring to fig. 16, a sixteenth illustrative shell-like dental implement 100q is shown.

The main difference between the sixteenth example and the fifteenth example is that: the first engaging portion 11q has two openings A8 spaced apart from each other and forming an inner surface a811 therebetween, and the two hook portions a71 of the hook a7 extend in a direction approaching each other and engage with the inner surface a 811.

Fig. 17 is a schematic view of a seventeenth example shell-like dental implement 100 r.

The seventeenth example is mainly different from the fifteenth example in that: the appendage 20r is located on the buccal surface B2 of the appliance body 10r, and the cross-section of the hook A7 is mushroom-shaped, with the perimeter of the mushroom forming a hook A71.

Referring to fig. 18, a schematic view of a shell-like dental instrument 100s of an eighteenth example is shown.

The main difference between the eighteenth example and the fifteenth example is that: the attachment 20s is located on the buccal surface B2 of the appliance body 10s, the hook a7 is located on the first mating portion 11s, and the opening a8 is located on the second mating portion 21 s.

Here, the hook a7 may be integrally formed with the appliance body 10s, the opening A8 is a through hole at the attachment 20s, the surface of the opening A8 away from the appliance body 10s forms an edge a81, the periphery of the hook a7 forms a hook a71, and a connection portion 30s is provided between the hook a71 and the edge a 81.

In the sixth embodiment, in conjunction with fig. 19, the stopper portion a is formed at least in a partial region between the second fitting portion 21t and the connecting portion 30 t.

The limiting part A comprises a hook A7 and an opening A8 which are mutually matched, the hook A7 comprises a hook A71, and the hook A71 and the edge A81 of the opening A8 limit mutually.

The hook A7 is located at the connecting portion 30t, and the opening A8 is located at the second mating portion 21 t.

When a force is applied to the attachment 20t along the first direction X, the stopper portion a restricts the attachment 20t from separating from the appliance body 10t along the first direction X.

Referring to fig. 19 to 23, the shapes and the arrangement positions of the hook a7 and the opening A8 are various examples.

Fig. 19 is a schematic view of a nineteenth example shell-shaped dental instrument 100 t.

The attachment 20t is located on the occlusal surface B1 of the appliance body 10t, the stopper a is formed between the second mating portion 21t and the connecting portion 30t, the hook a7 is located on the connecting portion 30t, and the opening a8 is located on the second mating portion 21 t.

Specifically, the attachment 20t includes a lower surface 201t proximate to the appliance body 10t and an upper surface 202t distal from the appliance body 10t, an opening A8 extends through the lower surface 201t and the upper surface 202t, and the connecting portion 30t extends through the opening A8 and to the upper surface 202t to form a hook a 7.

That is, the upper surface 202t can be regarded as the edge a81 of the opening A8, and the connecting portion 30t extends to the edge a81 to form the hook a 7.

Here, the connecting portion 30t is a glue joint or a welding joint filled in the opening A8 and the upper surface 202t, that is, the connecting portion 30t is a fluid material, and the connecting portion 30t is solidified to form a hook a 7.

In practical applications, in order to avoid excessive extension of the connecting portion 30t, the upper surface 202t has a recessed portion 203t communicating with the opening A8, the hook a7 is located in the recessed portion 203t, that is, the connecting portion 30t fills the recessed portion 203t to form the hook a7, the surface of the recessed portion 203t close to the opening A8 can be regarded as the edge a81 of the opening A8, and the recessed portion 203t can limit the extension range of the connecting portion 30 t.

In addition, the first matching part 11t can be a plane, a gap is formed between the lower surface 201t of the attachment 20t and the first matching part 11t, and the connecting part 30t extends into the gap, so that the connecting strength of the attachment 20t and the appliance body 10t is improved.

Fig. 20 and 21 are schematic views of a twentieth example of a shell-shaped dental instrument 100 u.

The twentieth example differs from the nineteenth example mainly in that: unlike the glued portion or the welded portion of the nineteenth example, the joining portion 30u of the twentieth example is made of a hard material, the joining portion 30u includes a supporting portion 301u and a weld point 302u joined thereto, the supporting portion 301u passes through the opening A8, and the weld point 302u is formed on the upper surface 202u of the attachment 20u as a hook a7 by a welding process.

Specifically, the first engaging portion 11u is an outer surface 102u of the appliance body 10u far away from the cavity S, the second engaging portion 21u is an opening A8 penetrating through a lower surface 201u and an upper surface 202u of the attachment 20u, one end of the connecting portion 30u is connected to the outer surface 102u, the connecting portion 30u can be integrally formed with the appliance body 10u, the connecting portion 30u and the appliance body 10u can be made of the same material, but not limited thereto, the connecting portion 30u can be an independent structure, and the connecting portion 30u and the appliance body 10u are assembled with each other, or the connecting portion 30u and the appliance body 10u are made of different materials.

Referring to fig. 20, when the attachment 20u is not completely fixed, the joining portion 30u does not form the solder point 302u, the joining portion 30u having a columnar shape passes through the opening A8 and forms the solder portion 303u protruding out of the opening A8, and the attachment 20u is pre-positioned with the appliance body 10u by the joining portion 30u and the opening A8.

Referring to fig. 21, the welding portion 303u is melted by a welding process, and the welding portion 303u is formed as a solder retention point 302u received in the recess 203u, wherein the solder retention point 302u is a hook a7 cooperating with an edge a81 of the opening A8.

Here, the welding process is ultrasonic welding, laser welding, electrothermal fusion welding, friction welding, pulse welding, or infrared welding.

Fig. 22 and 23 are schematic views of a twenty-first example of a shell-like dental implement 100 v.

The twenty-first example differs from the twentieth example mainly in that: the accessory 20v is located on a buccal surface B2 of the appliance body 10v, the second matching part 21v comprises two openings a8 distributed at intervals, two connecting parts 30v connecting the first matching part 11v respectively pass through the corresponding openings a8, then a welding part 303v of the connecting part 30v is welded through a welding process to form a fixing welding point 302v on an upper surface 202v of the accessory 20v, and the fixing welding point 302v serves as a clamping hook a7 and forms a limiting part a with an edge a81 (namely the upper surface 202v) of the opening a 8.

In the seventh embodiment, referring to fig. 24, the stopper portion a is formed at least in a partial region between the first fitting portion 11w and the connecting portion 30 w.

The limiting part A comprises a hook A7 and an opening A8 which are matched with each other, the hook A7 comprises a hook part A71, and the hook part A71 and the edge A81 of the opening A8 limit each other.

The hook A7 is located at the connecting portion 30w, and the opening A8 is located at the first mating portion 11 w.

When a force is applied to the attachment 20w along the first direction X, the limiting portion a limits the attachment 20w to be separated from the appliance body 10w along the first direction X.

With reference to fig. 24 to 26, the shapes and the arrangement positions of the hook a7 and the opening A8 are various examples.

Referring to fig. 24, a schematic view of a twenty-second example shell-like dental instrument 100w is shown.

The attachment 20w is located on the occlusal surface B1 of the appliance body 10w, the limiting portion a is formed between the first mating portion 11w and the connecting portion 30w, the hook a7 is located on the connecting portion 30w, and the opening a8 is located on the first mating portion 11 w.

Specifically, the appliance body 10w includes an inner surface 101w close to the cavity S and an outer surface 102w far away from the cavity S, the opening A8 penetrates through the inner surface 101w and the outer surface 102w, and the connecting portion 30w penetrates through the opening A8 and extends to the inner surface 101w to form the hook a 7.

That is, the inner surface 101w can be regarded as the edge a81 of the opening A8, and the connecting portion 30w extends to the edge a81 to form the hook a 7.

Here, the connecting portion 30w is a bonding portion or a welding portion filled in the opening A8 and the inner surface 101w, that is, the connecting portion 30w is a fluid material, and the connecting portion 30w is cured to form the hook a 7.

In addition, the second matching portion 21w may be a plane, a gap is formed between the outer surface 102w and the attachment 20w, and the connecting portion 30w extends into the gap, so as to improve the connection strength between the attachment 20w and the appliance body 10 w.

Fig. 25 and 26 are schematic views of a twenty-third example shell-shaped dental instrument 100 x.

The twenty-third example differs from the twenty-second example mainly in that: unlike the glue or weld of the twenty-second example, the joint 30x of the twenty-third example is made of a hard material, the joint 30x includes a support portion 301x and a solder retention point 302x connected to each other, the support portion 301x passes through the opening A8, and the solder retention point 302x is formed on the inner surface 101x of the appliance body 10x as a hook a7 by a welding process.

Specifically, the second engaging portion 21x is a lower surface 201x of the attachment 20x close to the appliance body 10x, the first engaging portion 11x is an opening A8 penetrating through the outer surface 102x and the inner surface 101x of the appliance body 10x, one end of the connecting portion 30x is connected to the lower surface 201x, the connecting portion 30x and the attachment 20x may be integrally formed, the connecting portion 30x and the attachment 20x may be made of the same material, but not limited thereto, the connecting portion 30x may be an independent structure, and the connecting portion 30x and the attachment 20x are assembled with each other, or the connecting portion 30x and the attachment 20x are made of different materials.

Referring to fig. 25, when the attachment 20x is not completely fixed, the joining portion 30x does not form the solder point 302x, the joining portion 30x having a columnar shape passes through the opening A8 and forms the solder portion 303x protruding out of the opening A8, and the attachment 20x is pre-positioned with the appliance body 10x by the joining portion 30x and the opening A8.

Referring to fig. 26, the welding portion 303x is melted by the welding process, and the welding portion 303x is formed as a welding point 302x on the inner surface 101x, wherein the welding point 302x is a hook a7 cooperating with an edge a81 of the opening A8.

Here, the welding process is ultrasonic welding, laser welding, electrothermal fusion welding, friction welding, pulse welding, or infrared welding.

In the eighth embodiment, referring to fig. 27, the stopper portion a is formed at least in a partial region between the first fitting portion 11y and the connecting portion 30y, and the stopper portion a is formed at least in a partial region between the second fitting portion 21y and the connecting portion 30 y.

That is, the shell-shaped dental instrument 100y of the present embodiment includes a first position-limiting portion a and a second position-limiting portion a ', the first position-limiting portion a includes a first hook a7 and a first opening A8 that are engaged with each other, and the second position-limiting portion a' includes a second hook a7 'and a second opening A8' that are engaged with each other.

That is, in the present embodiment, by providing the connecting portion 30y, the first stopper portion a and the second stopper portion a 'are respectively formed between the first engaging portion 11y and the connecting portion 30y and between the second engaging portion 21y and the connecting portion 30y, and the connecting portion 30y not only serves to connect the first engaging portion 11y and the second engaging portion 21y, but also serves to form the first stopper portion a and the second stopper portion a'.

When a force is applied to the attachment 20y along the first direction X, the first limiting portion a and the second limiting portion a' limit the detachment of the attachment 20y from the appliance body 10y along the first direction X.

Specifically, fig. 27 is a schematic view of a twenty-fourth example of a shell-like dental instrument 100 y.

The appendage 20y is positioned at the occlusal surface B1 of the appliance body 10 y.

The connection portion 30y includes a support portion 301y and first and second weld points 302y and 302 y' at both ends of the support portion 301 y.

The first mating portion 11y is a first opening A8 through the inner surface 101y and the outer surface 102y of the appliance body 10y, and the second mating portion 21y is a second opening A8' through the lower surface 201y and the upper surface 202y of the attachment 20 y.

The supporting portion 301y simultaneously passes through the first opening A8 and the second opening A8', and the first retention solder 302y is used as the first hook a7 to limit the inner surface 101y of the appliance body 10y, i.e. the first hook a7 and the first opening A8 are mutually matched to form the first limiting portion a.

The second solder retention point 302y ' serves as a second hook A7 ' for limiting the position of the upper surface 202y of the accessory 20y, i.e., the second hook A7 ' cooperates with the second opening A8 ' to form a second limiting portion A '.

Referring to fig. 28, in other embodiments, the stopper portion a may not be formed between the first engagement portion 11z and the second engagement portion 21 z.

Specifically, the first mating portion 11z and the second mating portion 21z are connected by the connecting portion 30z, because the cross sections of the first mating portion 11z and the second mating portion 21z are both stepped, the cross section of the gap A3 formed between the first mating portion 11z and the second mating portion 21z is also stepped, the connecting portion 30z located in the gap A3 extends along the step portion, and the stepped mating structure does not form a limiting portion a between the first mating portion 11z and the second mating portion 21z, which limits the first direction X.

It should be noted that, although there is no mechanical retention formed by the position-limiting portion a, the stepped structure may also weaken the flow of the connecting portion 30z to avoid the stress concentration at the edge of the glued retention (or welded retention) formed by the connecting portion 30z, and the glue force (or welding force) may be uniformly distributed on the whole glued portion (or welded portion), thereby significantly enhancing the connection strength and connection reliability between the appliance body 10z and the attachment 20 z.

In addition, the outer contour of the first engaging portion 11z and the inner contour of the second engaging portion 21z are matched with each other, and the height of the first engaging portion 11z decreases from the middle to both sides in the first direction X, but not limited thereto, the step-shaped structure may have another form, or the form of the step-shaped structure may be changed to generate the above-described stopper portion a.

In summary, the appliance body 10 and the attachment 20 of the present invention realize dual retention through the connecting portion 30 and the limiting portion a, which can effectively enhance the connection strength and connection reliability between the appliance body 10 and the attachment 20, thereby reducing the risk of falling off of the attachment 20; in addition, the mechanical retention formed by the limiting portion a of the present embodiment can weaken the flow of the connecting portion 30 to avoid the stress concentration at the edge of the glue retention (or the welding retention), and the glue force (or the welding force) can be uniformly distributed on the whole glue portion (or the welding portion), thereby significantly enhancing the connection strength and the connection reliability between the appliance body 10 and the attachment 20.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (39)

1. The utility model provides a shellliform dental appliance which characterized in that, is including forming the ware body and the annex of rectifying of holding the cavity of tooth, it has first cooperation portion to rectify the ware body, the annex has second cooperation portion, shellliform dental appliance is still including connecting first cooperation portion reaches the connecting portion of second cooperation portion, first cooperation portion the second cooperation portion reaches be formed with the spacing portion each other on the first direction between two of them of connecting portion, first direction is for rectify the ware body orientation the direction of annex.

2. A shell-like dental instrument according to claim 1, wherein the connection is a glue or weld.

3. A shell-like dental instrument according to claim 1, wherein the connecting portion is filled at least in the stopper portion.

4. A shell-like dental instrument as in claim 1, wherein the stop portion comprises a groove and a protrusion that mate with each other.

5. A shell-like dental instrument according to claim 4, wherein the inner contour of the recess and the outer contour of the projection match each other.

6. A shell-like dental instrument according to claim 4, wherein the cross-section of the protrusion is inverted trapezoidal, mushroom-shaped or threaded.

7. A shell-like dental instrument according to claim 4, wherein the recess is located in one of the first and second mating portions and the projection is located in the other of the first and second mating portions.

8. A shell-like dental instrument according to claim 7, wherein the connecting portion fills at least a gap formed by the fit of the recess and the projection.

9. A shell-like dental instrument as in claim 4, wherein the recess is located in one of the first mating portion and the connecting portion and the projection is located in the other of the first mating portion and the connecting portion.

10. A shell-like dental instrument according to claim 9, wherein the second engagement portion is a flat or a male-female engagement with the connecting portion.

11. A shell-like dental instrument according to claim 9, wherein the second mating portion and the connecting portion form the stop portion therebetween.

12. A shell-like dental implement according to any one of claims 7 to 11, characterised in that the appliance body comprises a cavity to fit the tooth and a first engagement portion projecting outwardly of the cavity, the first engagement portion comprising a chamber communicating with the cavity, the recess being located within the chamber.

13. A shell-like dental instrument as in claim 4, wherein the recess is located in one of the second mating portion and the connecting portion and the projection is located in the other of the second mating portion and the connecting portion.

14. A shell-like dental instrument according to claim 13, wherein the first engagement portion is a flat or a male-female engagement with the connecting portion.

15. A shell-like dental instrument as in claim 4, wherein the cross-section of the protrusion is inverted trapezoidal or trapezoidal, the stop portion comprising a first angle between a lower base and a waist, the first angle being an acute angle.

16. A shell-like dental instrument according to claim 15, wherein the first included angle is in the range of 60 ° to 80 °.

17. A shell-like dental instrument according to claim 1, wherein the stop portion comprises a hook and an opening cooperating with each other, the hook comprising a hook portion which stops against an edge of the opening.

18. A shell-like dental instrument as in claim 17, wherein the hook is located on one of the first and second mating portions and the opening is located on the other of the first and second mating portions.

19. A shell-like dental instrument according to claim 18, wherein the connecting portion fills at least a space formed by the hook portion in cooperation with an edge of the opening.

20. The shell-like dental instrument of claim 18, wherein the appliance body includes a cavity that mates with a tooth and a first mating portion that projects outwardly from the cavity, the first mating portion including a cavity in communication with the cavity and the opening in communication with the cavity, the hook extending through the opening into the cavity.

21. A shell-like dental instrument as in claim 17, wherein the catch is located at the connecting portion and the opening is located at the second mating portion.

22. The shell-like dental instrument of claim 21, wherein the attachment includes a lower surface proximate the appliance body and an upper surface distal from the appliance body, the opening extending through the lower surface and the upper surface, the connection portion extending through the opening to the upper surface to form the catch.

23. A shell-like dental instrument as in claim 22, wherein the upper surface has a recess communicating with the opening, the hook being located in the recess.

24. A shell-like dental instrument according to claim 22, wherein the connection portion is a glue or weld filling the opening and the upper surface.

25. A shell-like dental instrument according to claim 24, wherein the lower surface and the first mating portion have a gap therebetween, the connecting portion extending into the gap.

26. A shell-like dental instrument as in claim 22, wherein the connecting portion comprises a support portion and a weld retention point connected, the support portion passing through the opening, the weld retention point being formed on the upper surface as the hook by a welding process.

27. A shell-like dental instrument according to claim 26, wherein the welding process is ultrasonic welding, laser welding, electro thermal fusion welding, friction welding, impulse welding or infrared welding.

28. A shell-like dental instrument according to claim 26, wherein the attachment portion is integrally formed with the appliance body.

29. The shell-like dental instrument of claim 26, wherein the appliance body includes an inner surface proximate the cavity, an outer surface distal from the cavity, and an opening extending through the inner and outer surfaces, the connection passing through the opening and forming another weld retention point on the inner surface, the weld retention point being formed by a welding process.

30. A shell-like dental instrument according to claim 17, wherein the catch is located at the connection portion and the opening is located at the first mating portion.

31. The shell-like dental instrument of claim 30, wherein the appliance body includes an inner surface proximate the cavity and an outer surface distal from the cavity, the opening extending through the inner and outer surfaces, the connection extending through the opening to the inner surface as the catch.

32. A shell-like dental instrument according to claim 31, wherein the connection portion is a glue or weld filling the opening and the inner surface.

33. A shell-like dental instrument as in claim 31, wherein the outer surface and the attachment have a gap therebetween, the connection extending into the gap.

34. A shell-like dental instrument according to claim 31, wherein the connection portion comprises a support portion and a weld point connected, the support portion passing through the opening, the weld point being formed on the inner surface by a welding process to form the hook.

35. The shell-like dental instrument of claim 1, wherein the first mating portion is integrally formed with the appliance body and the second mating portion is integrally formed with the attachment.

36. The shell-like dental instrument of claim 1, wherein the attachment is located at a localized region of the appliance body, the second mating portion and the first mating portion being configured to: the second matching part is inserted into the first matching part along a second direction, and a second included angle between the second direction and the first direction is an acute angle or a right angle.

37. A shell-like dental instrument according to claim 36, wherein the second included angle is in the range of 60 ° to 90 °.

38. The shell-like dental instrument of claim 1, wherein the attachment is located on a buccal, lingual, or occlusal surface of the appliance body.

39. A shell-like dental instrument as in claim 1, wherein the accessory is a traction button, a bracket, a jaw pad, a bi-mandibular plate, a flat guide plate or a stiffener.

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