CN114246698A - Design method and manufacturing method of shell-shaped tooth appliance - Google Patents
Design method and manufacturing method of shell-shaped tooth appliance Download PDFInfo
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- CN114246698A CN114246698A CN202011016472.8A CN202011016472A CN114246698A CN 114246698 A CN114246698 A CN 114246698A CN 202011016472 A CN202011016472 A CN 202011016472A CN 114246698 A CN114246698 A CN 114246698A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
Abstract
The invention discloses a design method and a manufacturing method of a shell-shaped tooth appliance, which solve the problem of insufficient retention of the existing shell-shaped tooth appliance, particularly the problem of insufficient retention of teeth with short dental crowns, improve the correction curative effect of the shell-shaped tooth appliance, increase the retention of the short teeth without influencing the appearance, and achieve the purposes of increasing the invisible correction treatment effect and the satisfaction degree of patients. The design method of the shell-shaped tooth appliance comprises the steps of obtaining a digital tooth jaw model, cutting the digital tooth jaw model, virtually designing an appliance plan and designing the digital model of the shell-shaped tooth appliance. The manufacturing method is to manufacture the shell-shaped tooth appliance based on the design method.
Description
Technical Field
The invention belongs to the technical field of tooth correction, more particularly relates to a shell-shaped tooth corrector manufacturing technology, and particularly relates to a design method and a manufacturing method of a shell-shaped tooth corrector with a reinforced retention effect.
Background
In recent years, with the widespread use of orthodontic treatment, more and more people select invisible correction, and the appearance and comfort are both achieved in the process of receiving orthodontic treatment.
However, in the invisible correction, the tooth retention aiming at the crown shortness is a great technical difficulty to be solved at present. Insufficient retention of the short crown may cause the invisible dental appliance to be unable to retain with the teeth for a long time, resulting in the appliance being unable to provide a continuous correction force for a long time, affecting the correction efficacy and the correction process. In addition, the adhesion of the attachments on the short dental crowns is difficult, and the problem of insufficient expression of the attachment effect is easily caused, so that the short dental crowns are more crowds and teenagers, the dental crowns are short and have poor compliance, and the attachment is difficult to keep an open state and be stuck in the mouth for a long time.
In traditional dental instruments, the functional correction device generally adopts adjacent hooks made of stainless steel wires, mainly adopts the right-angle-shaped hooks to go deep into the adjacent gaps of teeth, and utilizes the undercut to play a role in retention, but the functional correction device is not only not attractive and not enough, but also easily causes the injury of the oral mucosa. In particular, the interproximal hooks of the anterior dental area and the anterior molar area are easily exposed during patient communication, which may lead to social disability or psychosocial issues for the patient. In addition, the conventional interproximal hook is divided into two parts: a retention channel and a connector; the retention groove enters the inverted concave area of the adjacent surface of the tooth, and the connector prevents the steel wire from rotating in the base. The structure of the traditional adjacent hook is a common structure for fixed correction, and the combination effect cannot be achieved when the invisible correction is used.
Therefore, the invisible appliance which can be worn beautifully and comfortably and can achieve the correction effect has important significance.
Disclosure of Invention
The invention mainly aims to provide a design method and a manufacturing method of a shell-shaped tooth appliance, which solve the problems of insufficient retention of the existing shell-shaped tooth appliance, particularly insufficient retention of teeth with short dental crowns, improve the correction curative effect of the shell-shaped tooth appliance, increase the retention of the short teeth without influencing the appearance, and further achieve the purposes of increasing the invisible correction treatment effect and the satisfaction degree of patients.
The technical scheme provided by the invention is as follows:
a design method of a shell-shaped dental appliance comprises the following steps:
acquiring a digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital tooth model and a digital gum model;
cutting the digital dental model: dividing the digital dental model into an independent digital gum model and a single digital dental crown model;
virtual design of the orthodontic plan: virtually designing the single digital dental crown model to enable the single digital dental crown model to gradually change from an initial position to a target correcting position to obtain a series of intermediate digital dental models;
design of a shell-shaped dental appliance digital model: the shell-shaped tooth appliance comprises a shell-shaped body, wherein the shell-shaped body is provided with a cavity for accommodating a plurality of teeth, an auxiliary retaining part is arranged between the cavities for accommodating two adjacent teeth, and the auxiliary retaining part is designed to have a geometric structure for providing retaining force for stably wrapping the shell-shaped body on the plurality of teeth.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention part and the cavity for accommodating the teeth are used for firmly wrapping 70-100% of the area of a single tooth.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portions are designed to have a geometry concavely formed toward the gaps between teeth and/or the gum.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention part is arranged at a part of the shell-shaped body adjacent to one side of the gingiva and/or adjacent to a tooth gap between two adjacent teeth.
As a preferable embodiment of the design method of the shell-shaped dental appliance, when the auxiliary retention portion is disposed at a position of the shell-shaped body adjacent to a gap between two adjacent teeth, the auxiliary retention portion is designed as a filling portion which is formed to be concave inward toward the gap between the teeth and can fill the gap between the teeth.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the filling portion is designed to be a plate-shaped structure connecting the teeth in the buccal/lingual or labial/lingual direction between the teeth slits, or the filling portion is designed to be an indent structure disposed in the buccal/lingual or labial/lingual direction between the teeth slits, the indent structure at least partially covering the mesial/distal surfaces of two adjacent teeth.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention part is designed as a concave triangular structure wrapping the gingival papilla and having a shape matching the shape of the gingival papilla.
As a preferable embodiment of the method for designing the shell-shaped dental appliance, the auxiliary retention part is designed to be spaced from the gingival papilla by a distance of 0.1 to 0.6 mm.
As a preferable embodiment of the method of designing the shell-shaped dental appliance, the auxiliary retention portions are provided on the lingual side, or the labial/buccal side, or both the lingual side and the labial/buccal side of the shell-shaped body.
As a preferable embodiment of the design method of the shell-shaped dental appliance, the auxiliary retention portions are provided in an anterior tooth region, a posterior tooth region, or both of the anterior tooth region and the posterior tooth region of the shell-shaped body.
As a preferable embodiment of the method of designing the shell-shaped dental appliance, the modulus of elasticity of the auxiliary retention portion is greater than the modulus of elasticity of the portion of the shell-shaped body other than the auxiliary retention portion.
As a preferred embodiment of the method of designing the shell-shaped dental appliance for increasing the retention of an abbreviated crown; the shell-like body is designed with a geometry that gradually repositions the teeth from an initial position to a target correction position.
Based on the same inventive concept, the invention also provides a manufacturing method of the shell-shaped tooth appliance, wherein the shell-shaped tooth appliance is obtained by manufacturing the digital model of the shell-shaped tooth appliance obtained by the design method of any one of the shell-shaped tooth appliances by adopting hot-pressing film forming or an additive manufacturing process.
Through the design method and the manufacturing method of the shell-shaped tooth appliance provided by the invention, at least one of the following beneficial effects can be brought:
the shell-shaped tooth appliance obtained by the design method and the manufacturing method provided by the invention is also provided with the auxiliary retention part between the cavities of the shell-shaped body for accommodating two adjacent teeth, the auxiliary retention part has a geometric structure for providing retention force for enabling the shell-shaped body to stably wrap the multiple teeth, better retention force is provided for the teeth, attachment sticking of accessories can be reduced for a patient with a small dental crown, the comfort of the patient is improved, particularly for teenager patients, the chair-side visit time of the patient is shortened, and the compliance of the patient is indirectly improved.
The shell-shaped tooth appliance obtained by the design method and the manufacturing method provided by the invention can also directly or indirectly increase the gap distance between teeth, and can maintain the gap distance for patients needing to maintain the gap between teeth, thereby providing the appliance condition for the subsequent correction.
Drawings
The foregoing features, technical features, advantages and embodiments are further described in the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic flow chart of a method for designing a shell-shaped dental appliance according to the present invention;
FIG. 2 is a schematic structural view of a shell-shaped dental appliance according to the design method of the present invention;
fig. 3a, 3b are sectional views along a-a' of fig. 2, with emphasis on illustrating the auxiliary retainers;
FIG. 4 is a partial view of another auxiliary retention portion of a shell-shaped dental appliance according to the present invention;
FIG. 5 is a schematic structural view of another shell-shaped dental appliance provided by the design method of the present invention;
FIGS. 6a and 6B are sectional views taken along line B-B' in FIG. 5, wherein two views are partial sectional views of two types of filling parts in plate-like structures;
FIG. 7 is a cross-sectional view of another shell-shaped dental appliance designed according to the present invention, wherein the filling portion is a partial cross-sectional view of the concave structure.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1
The present embodiment provides a method for designing a shell-shaped dental appliance for reinforcing and fixing the appliance to teeth, referring to fig. 1, the method comprises the following steps:
s1, acquisition of the digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital tooth model and a digital gum model;
s2, cutting of the digital dental model: dividing the digital dental model into an independent digital gum model and a single digital dental crown model;
s3, virtual design of the correction plan: virtually designing the single digital dental crown model to enable the single digital dental crown model to gradually change from an initial position to a target correcting position to obtain a series of intermediate digital dental models; the initial position can be the original layout of teeth before orthodontic correction, or any stage in the correction process, and the target correction position can be any stage after orthodontic correction, and can be the later stage or the later stages of the original layout of teeth;
s4, designing a shell-shaped dental appliance digital model: the shell-shaped tooth appliance comprises a shell-shaped body, wherein the shell-shaped body is provided with a cavity for accommodating a plurality of teeth, an auxiliary retaining part is arranged between the cavities for accommodating two adjacent teeth, and the auxiliary retaining part is designed to have a geometric structure for providing retaining force for stably wrapping the shell-shaped body on the plurality of teeth.
In the design method described in the present embodiment,
the digital dental model obtained in step S1 can be obtained by any method of: obtaining a digital model representing an original tooth layout by means of tomographic X-ray scanning (CAT scanning), digital tomographic X-ray scanning (CT), cone-beam CT scanning (CBCT), Magnetic Resonance Imaging (MRI), intraoral optical scanning, and the like; alternatively, a plaster cast of the patient's teeth may be made by conventional means and then scanned by a scanning device, such as a laser scanning device, a CT scanning device, to obtain a digital model representing the original tooth layout;
the cutting of the digitized dental model in step S2 can take the following non-limiting examples:
the segmentation method is performed, for example, by the following steps:
s200: selecting a first class of characteristic points on a digital dental model to be segmented, wherein the digital dental model is a triangular patch model.
S201: and classifying the second class of feature points in the digital dental model according to the first class of feature points, and determining the tooth to which each second class of feature point belongs.
S202: respectively merging the second type of characteristic points belonging to each tooth to obtain a digital tooth area of each single tooth after the digital tooth jaw model is segmented;
the first type of characteristic points are triangular patch vertexes which are selected based on the digital dental model and used for guiding the segmentation of each single tooth in the dental jaw, and the second type of characteristic points are triangular patch vertexes which are selected based on the digital dental model and used for representing the overall shape of the digital dental model; that is, the first type of feature points are used to guide the segmentation of the dental jaw, and the second type of feature points are feature points when the dental jaw is specifically segmented; through the segmentation guidance of the first class of feature points, the second class of feature points can be accurately classified to each tooth, so that the segmentation precision of the dental jaw is improved;
the first class of feature points are selected on the whole digital dental model, then the second class of feature points on the digital dental model are classified and collected according to the first class of feature points, and the segmentation of the single tooth is realized.
In step S3, virtually designing the single digital dental crown model so that the single digital dental crown model gradually changes from an initial position to a target correction position to obtain a series of intermediate digital dental models; the initial position can be the original layout of the teeth before orthodontic correction, or any stage in the correction process, and the target correction position can be any stage after orthodontic correction, and can be the later stage or the later stages of the original layout of the teeth; the target correcting position can be a position for finally correcting the effect according to the patient appeal and the oral condition by doctors and medical designers, can also be recommended according to the oral digital design software and the target correcting position according to similar cases, and can also be adjusted more specifically for the treatment of patients according to the recommendation result.
In step S4, the shell-like body has a plurality of portions between the cavities for receiving two adjacent teeth, and auxiliary retainers may be provided on one or more of the portions. The stable package includes all the conditions that the auxiliary retainer can generate retaining force, and further can be measured by the covered area of the tooth, for example, the covered area of a single tooth is 70-100% to define the stable package, and the area of the conventional shell-shaped body covering the single tooth is usually 60-65%.
Referring to fig. 2, which shows a structure of a shell-shaped dental appliance provided by the design method of the present embodiment, fig. 2 provides a shell-shaped dental appliance 100, which includes a shell-shaped body 11, where the shell-shaped body 11 has a plurality of cavities 110 for accommodating a plurality of teeth; the shell-like body 11 is provided with auxiliary retainers (e.g. at 111 as indicated in fig. 2) between the cavities accommodating two adjacent teeth, for example the cavities 110a and 110b accommodating two adjacent teeth, said auxiliary retainers having geometrical means providing a further retaining force which firmly wraps the shell-like body 11 around the plurality of teeth.
For the shell-shaped dental appliance 100, the shell-shaped body 11 can also provide partial tooth retention force, but when the crown is short, the retention force generated by only wrapping the shell-shaped body 11 on the surface of the tooth is not enough to ensure the retention effect between the shell-shaped body and the tooth, and the retention force provided by the auxiliary retention part is further strengthened and supplemented to the retention force of the shell-shaped body. For the structure of the specific shell-shaped tooth appliance, the shell-shaped body and the auxiliary retention part can be designed to be an integral structure or a split structure, the two structures are simple to manufacture, and the retention effect is better.
In one embodiment, one or more auxiliary retainers may be disposed on the shell-like body 11 at positions between one or more or all of the adjacent cavities 110 surrounding the teeth. Still further and specifically speaking, the auxiliary retention portion can be disposed on the lingual side or the labial/buccal side, or both the lingual side and the labial/buccal side of the shell-shaped body 11, and the specific configuration and number can be set according to the correction requirement of the actual case, for example, for the child correction patient, the adjacent cavities 110 wrapping the teeth on the shell-shaped body 11 can be spaced at intervals, so that the wearing comfort is achieved, and the retention effect is good.
The auxiliary retainers may have various forms or structures.
In one of the structures, the auxiliary retainer 211 is a geometric structure formed to be concave toward the gap between teeth, and more specifically, the auxiliary retainer 211 is adjacent to the gap between two adjacent teeth, as shown in fig. 3 a. Alternatively, the auxiliary retaining part 311 is a geometrical structure recessed toward the gum, and more specifically, the auxiliary retaining part 311 is disposed on a portion of the shell-shaped body adjacent to the gum side, as shown in fig. 3 b. When the auxiliary retention part 211 is a geometric structure formed by recessing the gap between the teeth, one of the two methods may be a recessed semi-cylindrical shape, for example, when there is a gap between two adjacent teeth, the occlusal ends and the gingival margin ends of the two teeth form a gap matching the height of the mesial surface of the teeth along the extending direction of the dental crown, and at this time, the auxiliary retention part is a recessed semi-cylindrical shape filling or partially filling the gap, and the labial/buccal and lingual sides may be all arranged or may be arranged on one side. When the auxiliary retention portion 311 is a geometric structure recessed toward the gum, one of the ways may be a recessed triangular structure, such as a recessed triangular structure matching with the shape of the papilla of the gum, or a recessed triangular structure matching with a black triangular region formed between two adjacent teeth adjacent to the gum. Alternatively, the auxiliary retainer may be formed by both of the above-described shapes. In a further preferred construction, the auxiliary retention part is located at a distance of 0.1-0.6mm from the gingival papilla. That is, the shape of the auxiliary retention part is identical to that of the gingival papilla, but a certain distance exists between the auxiliary retention part and the gingival papilla, so that the formed structure does not press soft tissue of the gum, and unnecessary intraoral injury is formed. In another embodiment, the auxiliary retaining portion 211 is a geometric structure formed by being inwardly concave toward the teeth gap and simultaneously being inwardly concave toward the gum, such an arrangement can better retain the teeth, and better achieve the retaining effect for the patient with the larger gap between the two adjacent teeth and the larger black triangle area.
More specifically, when the auxiliary retention portion is disposed on a side of the shell-shaped body adjacent to the gum, as shown in fig. 4, the auxiliary retention portion 411 includes a first connection portion 411a, a second connection portion 411b, and a transition connection portion 411c, the first connection portion 411a is connected to the cavity 110 of the shell-shaped body 11 wrapping one tooth, the second connection portion 411b is connected to the cavity 110 of the shell-shaped body 11 wrapping the adjacent tooth of the one tooth, and the transition connection portion 411c connects the first connection portion 411a and the second connection portion 411 b. More specifically, the transition connection portion 411c of the auxiliary retention portion 411 may be an arc-shaped transition structure, so that the formed structure can have a more gradual transition without causing damage to the mouth of the patient due to the formation of the corner structure.
The auxiliary retainer can be arranged at another position, and specifically, when the auxiliary retainer is arranged at a position where the shell-shaped body is close to a gap between two adjacent teeth, the auxiliary retainer is a filling part which is formed by inwards recessing the gap between the teeth and can fill the gap between the teeth. The arrangement is particularly suitable for the situation of the missing tooth or the tooth replacing period, wherein the auxiliary retaining part of the patient with the missing tooth not only has the retaining effect, but also can maintain the gap of the missing tooth and prevent the adjacent two teeth from inclining to the missing part to cause the inclination of the tooth root. For the patient in the tooth replacing period, especially for the patient close to the tooth replacing period, as the number of the permanent teeth is increased compared with that of the deciduous teeth, the deciduous teeth can be gradually arranged to generate gaps when replacing the teeth, and the gaps are reserved for the eruption of the permanent teeth, the reserved space which is naturally formed needs to be kept, the gap distance can be well maintained by forming the filling part between two adjacent teeth, and the crowding of the teeth after replacing the teeth due to insufficient gaps in the tooth replacing process is prevented.
Further, the filling portion 511 is a plate- like structure 511a, 511b connecting the labial/lingual direction or the buccal/lingual direction between the tooth gaps, as shown in fig. 5, 6a and 6 b; or the filling portion 611 is an indent structure disposed between the teeth gaps in the buccal/lingual or labial/lingual direction, which at least partially covers the proximal/distal surfaces of two adjacent teeth, as shown in fig. 7. More specifically, when the filling portion is a plate-like structure connecting the labial/lingual direction or the buccal/lingual direction between the teeth gaps, the filling portions 511a and 511b may be integrally or separately formed with the shell-like body 11, and more specifically, as shown in fig. 6a and 6b as 511a and 511b, respectively, the plate-like structure is filled at the gap between two adjacent teeth to maintain the gap distance, and at the same time, the plate-like structure is in contact with the mesial/distal surfaces of two adjacent teeth, increasing the contact area of the shell-like appliance with the teeth, thereby further increasing the retention effect with the teeth. When the filling part is an inward concave structure arranged between the gaps of the teeth along the buccal/lingual or labial/lingual direction, and the inward concave structure at least partially covers the proximal/distal surfaces of two adjacent teeth, as the filling part 611 in fig. 7, the method is suitable for the situation that the gap between two adjacent teeth is large, and the arrangement mode also has the effect of increasing the contact with the proximal/distal surfaces of two adjacent teeth, and meanwhile, the gap distance between two adjacent teeth can be maintained according to the actual correction requirement.
For the shell-shaped dental appliance designed by the design method, the auxiliary retainer can be arranged in the anterior tooth area or the posterior tooth area of the shell-shaped body, or in both the anterior tooth area and the posterior tooth area. More specifically, the selection of the corresponding setting position can be performed according to the correction requirement of the patient.
In the design method of the present invention, it is preferable that the elastic modulus of the auxiliary retention portion of the shell-shaped dental appliance is larger than the elastic modulus of the portion of the shell-shaped body other than the auxiliary retention portion. The above elastic modulus setting can be realized in various ways, for example, it can be:
in one embodiment, the hardness of the auxiliary retention part is greater than the hardness of the shell-shaped body except the auxiliary retention part, for example, the shore hardness of the auxiliary retention part is 65D-80D, and the shore hardness of the shell-shaped body except the auxiliary retention part is 50D-75D; more specifically, supplementary maintenance portion has than shell body except that supplementary maintenance portion bigger hardness, and this kind of mode of setting can produce to the tooth and rescue the power in for the shell body of parcel tooth is more comfortable at the in-process of wearing, and the hardness of supplementary maintenance portion is bigger still can prevent in addition that shell tooth from correcting the ware and taking the in-process of wearing and breaking off, strengthens the holistic practicality of shell tooth correction ware, extension life cycle.
In another embodiment, the auxiliary retainers are provided as a multi-layer structure comprising a base layer and reinforcing layers, wherein at least one reinforcing layer at least partially overlies the base layer; more specifically, the elastic modulus of the reinforcing layer is greater than that of the base layer, and in this case, the material of the base layer may be one, two or more of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester), TPU (thermoplastic polyurethane) or PC (polycarbonate). It should be noted that the materials of the auxiliary retention portion and the shell-shaped body may be the same or different, and when the materials of the auxiliary retention portion and the shell-shaped body are the same, they may be made of the same material with different elastic moduli.
In the above multilayer structure, the elastic modulus of the reinforcing layer is greater than that of the base layer, and the reinforcing layer having different elastic modulus can be used for targeted therapy according to the age or the intraoral condition of the patient.
Further, the thickness of the auxiliary retainer formed by the multilayer structure may be made larger than the thickness of the portion of the shell-like body other than the auxiliary retainer, further for example, the thickness of the auxiliary retainer is 2 to 5mm, and the thickness of the portion of the shell-like body other than the auxiliary retainer is 0.5 to 1.5 mm; the setting of this kind of form makes supplementary solid position portion have than shell form body stronger intensity, the difficult fracture condition when taking and wearing that takes place, wears comfortablely under the prerequisite of guaranteeing to correct the power simultaneously.
The shell-shaped dental appliance designed by the design method of the invention can be used in any situation where further retention of teeth is required or not easily retained, such as is common, for example, in the case of shell-shaped dental appliances for increased retention of short crowns.
In one embodiment, the shell-shaped dental appliance may also have the function of straightening teeth, in which case the shell-shaped body also has a geometry that gradually repositions the teeth from an initial position to a target straightening position, e.g., the shell-shaped body is aligned approximately or the same as the teeth of the target straightening position. The initial position of the tooth can be the initial position of the tooth to be corrected, or the position before any correction in the tooth correction process, and the target correction position of the tooth can be any position closer to the correction target than the initial position. When the shell-shaped tooth appliance is worn by a patient, the shell-shaped body 11 not only has the effect of wrapping the teeth, but also has the effect of moving and correcting the teeth, if the shell-shaped body has the function of increasing the potential force, the shell-shaped body also has the effect of moving and correcting the teeth, the efficiency of not only stage correction is improved, and the efficiency of correction is also improved to the whole correction scheme.
Example 2
The embodiment provides a method for manufacturing a shell-shaped dental appliance, which is to manufacture a digital model of the shell-shaped dental appliance obtained by the method for designing the shell-shaped dental appliance in the embodiment 1 by hot-pressing film forming or an additive manufacturing process to obtain the shell-shaped dental appliance.
For example, when the hot-pressing film forming process is adopted for manufacturing, a specific manufacturing method comprises the following steps: 3D printing is carried out on the basis of the digital dental model and a series of intermediate digital dental models, a solid dental model is manufactured, then shell-shaped dental appliances containing teeth are obtained on the solid dental model in a hot press molding mode, and then the shell-shaped dental appliances containing teeth are obtained by cutting along a gum line or a position close to the gum line on the shell-shaped dental appliances containing teeth.
For example, when the shell-shaped dental appliance is manufactured by an additive manufacturing process, a specific manufacturing process is to print and manufacture the designed shell-shaped dental appliance digital model by a 3D printing method.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (14)
1. A design method of a shell-shaped tooth appliance is characterized by comprising the following steps:
acquiring a digital dental model: acquiring a digital dental model, wherein the digital dental model comprises a digital tooth model and a digital gum model;
cutting the digital dental model: dividing the digital dental model into an independent digital gum model and a single digital dental crown model;
virtual design of the orthodontic plan: virtually designing the single digital dental crown model to enable the single digital dental crown model to gradually change from an initial position to a target correcting position to obtain a series of intermediate digital dental models;
design of a shell-shaped dental appliance digital model: the shell-shaped tooth appliance comprises a shell-shaped body, wherein the shell-shaped body is provided with a cavity for accommodating a plurality of teeth, an auxiliary retaining part is arranged between the cavities for accommodating two adjacent teeth, and the auxiliary retaining part is designed to have a geometric structure for providing retaining force for stably wrapping the shell-shaped body on the plurality of teeth.
2. The method of claim 1, wherein the auxiliary retention portion together with the tooth receiving cavity securely covers 70% to 100% of the area of a single tooth.
3. The method of claim 1, wherein the auxiliary retention portion is designed to have a geometry that is concave toward the interproximal spaces and/or gingiva direction.
4. The method of claim 3, wherein the auxiliary retention portion is disposed on a portion of the shell-shaped body adjacent to a side of the gum and/or adjacent to a gap between two adjacent teeth.
5. The method of claim 4, wherein when the auxiliary retention portion is disposed at a position of the shell-shaped body adjacent to a gap between two adjacent teeth, the auxiliary retention portion is a filling portion that is recessed inward into the gap and can fill the gap.
6. The method of claim 5, wherein the filling portion is configured as a plate-like structure connecting the teeth in the buccal/lingual or labial/lingual direction between the teeth slits, or is configured as an indent structure disposed in the buccal/lingual or labial/lingual direction between the teeth slits, the indent structure at least partially covering the mesial/distal surfaces of two adjacent teeth.
7. The method of claim 4, wherein when the auxiliary retention portion is disposed on a side of the shell-shaped body adjacent to the gum, the auxiliary retention portion is configured to include a first connection portion, a second connection portion, and a transition connection portion, the first connection portion is connected to a cavity of one tooth wrapped by the shell-shaped body, the second connection portion is connected to a cavity of an adjacent tooth wrapped by the shell-shaped body, and the transition connection portion connects the first connection portion and the second connection portion.
8. The method of claim 7, wherein the auxiliary retention portion is designed as a concave triangular structure that wraps around the gingival papilla and has a shape that conforms to the shape of the gingival papilla.
9. The method of claim 7 or 8, wherein the auxiliary retention part is designed to be 0.1-0.6mm away from the gingival papilla.
10. The method of claim 1, wherein the auxiliary retention portion is provided on a lingual side, or a labial/buccal side, or both the lingual side and the labial/buccal side of the shell-shaped body.
11. The method of claim 1, wherein the auxiliary retention portion is disposed in an anterior dental zone, or a posterior dental zone, or both of the shell-shaped body.
12. The method of designing a shell-shaped dental appliance of claim 1, wherein the auxiliary retention portion has a modulus of elasticity greater than that of a portion of the shell-shaped body other than the auxiliary retention portion.
13. The method of designing a shell-shaped dental appliance of claim 1, wherein the shell-shaped dental appliance is used to increase the retention of an abbreviated crown; the shell-like body is designed with a geometry that gradually repositions the teeth from an initial position to a target correction position.
14. A method for manufacturing a shell-shaped dental appliance, which is characterized in that a shell-shaped dental appliance digital model obtained by the method for designing a shell-shaped dental appliance according to any one of claims 1 to 13 is manufactured by hot-pressing film forming or an additive manufacturing process to obtain the shell-shaped dental appliance.
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