JP2863100B2 - Tooth retention device and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dentition retention device and a method of manufacturing the same. More specifically, the orthodontic device comprises a base portion which is in close contact with the upper or lower surface of the palate and the root portion of each tooth on the back side of the dentition, and a holding means made of a thermoplastic resin having an end portion fixed to the base portion. The present invention relates to a dentition retention device for maintaining a desired dentition by pressing a set tooth between the base portion and the holding means, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a saddle-shaped base portion formed by taking the shape of the lower or upper jaw of a patient's palate so as to be in close contact with the inner surface of the palate and the back surface of each tooth of the dentition. There is known a dentition retention device (hereinafter referred to as a retention device) comprising a metal holding means fixed to a front end of the base portion. In the case of this retaining device, after attaching the metal hook-shaped support parts provided on the left and right sides of the rear end of the base to the molars, the both ends of the metal wire are attached to the front end of the base. A fixed, loop-shaped retaining means is mounted to surround the plurality of teeth, including the corrected teeth.

[0003] The base portion of the retaining device mounted on the dentition in this manner is stably fixed to the dentition because it is supported by the left and right molar teeth and the front end of the dentition at three points.

[0004] Further, since the corrected teeth are attached in a ring shape by the holding means, even if it is attempted to return to the state before the correction, a reaction force is generated in the holding means. Pressed. Since the state of the dentition corrected in this way is maintained, it is prevented from being twisted or inclined again as before.

[0005]

However, in the above-mentioned conventional retaining device, there is a problem that the retaining means is made of metal, so that the retaining means is inevitably noticeable during the period of attachment to the dentition.

Further, in the case of the conventional retaining device, it is necessary to form the retaining means in an annular shape as described above, and when attaching the retaining device to the dentition, the dentist or dental technician optimizes the retaining effect. Therefore, it is necessary to make fine adjustments on site after checking the holding means and the degree of contact with the teeth and the gaps so that the teeth can be adapted to the patient's dentition. For this reason, as the material of the holding means, a metal which can easily perform plastic working must be selected. Therefore, with the conventional retaining device, the corrected teeth cannot be positively urged against the base portion, so that there is a problem that the state slightly returns to the state before the correction.

Further, there is a problem that the retaining device comes off during the meal of the patient, and a gap is formed between the teeth and the holding means during repeated attachment and detachment.

[0008] The present invention provides a retaining device which does not stand out during mounting, and which can maintain a desired dentition state for a certain period of time while reliably urging the corrected teeth against the base portion. The purpose is to provide.

[0009]

According to a first aspect of the present invention, the palate has a shape adapted to the upper or lower surface shape of the palate, and its peripheral edge is in close contact with the back side of each tooth of the dentition. A formed base portion, one or more holding means, made of thermoplastic resin, having an end fixed to the base portion and being looped around a plurality of teeth including the orthodontic treated teeth; What is claimed is: 1. A dentition retention device comprising: a spring portion for applying an urging force to a row; and a support portion for supporting the base portion on a molar, wherein the thermoplastic resin is polycarbonate, polyethylene terephthalate, polybutylene terephthalate, cyclohexane It is selected from a synthetic resin consisting of a group consisting of dimethanol-terephthalic acid copolymer and is heated at a heating temperature higher than a past heating temperature within a certain temperature range. Has a property of deformation is fixed when cooled, and dental positioner, characterized in that it comprises a heat-shrinkable, is provided.

According to a second aspect of the present invention, (a) a thermoplastic resin wire having a length substantially equal to the total length of the upper or lower dentition is wound around the dentition model, and the straight portion and the circular portion are wound. Bending into a substantially U-shape having an arcuate portion, and heating the portion of the arcuate portion that contacts the incisor and canine to the first temperature, so that the portion has a rectangular cross section. Press working, (b) deforming a portion adjacent to the portion in contact with the incisor and canine teeth, heating at a second temperature lower than the first temperature, and cooling to form a spring portion; (C) attaching the wire to a dentition model, bending the distal end of the wire into a hook shape so that a molar can be wrapped around the wire, and forming the straight portion including the hook portion into the second temperature. A step of heating and heat shrinking after deformation at a lower third temperature A method for producing a tooth retention device, wherein the thermoplastic resin is selected from a synthetic resin consisting of a group consisting of polycarbonate, polyethylene terephthalate, polybutylene terephthalate, and cyclohexanedimethanol-terephthalic acid copolymer, and has a certain temperature range. Inside, heating at a heating temperature higher than the past heating temperature,
Provided is a method for manufacturing a dentition retention device, which has a property of fixing deformation when cooled and has heat shrinkability.

[0011]

According to the tooth retention device of the present invention, since the holding means made of a thermoplastic resin is used and can be made transparent, it is inconspicuous even when the retention device is mounted.

Further, the thermoplastic resin employed in the holding means of the present invention has such a property that it is heated at a heating temperature higher than the past heating temperature within a certain temperature range, and the deformation is fixed when cooled. And has heat shrinkability. for that reason,
When the wire at the time of manufacturing is deformed according to the shape of the dentition model of a patient, the wire is bent into a U-shape and the first wire is bent.
After heating the arc-shaped portion at the temperature described above, and then deforming the portion corresponding to the spring portion into a desired shape, heating and cooling at a heating temperature (second temperature) lower than the first temperature, Next, fix the tip of the wire to the teeth, deform the straight part of the wire,
Heating at a temperature lower than the second temperature, followed by cooling and then heat shrinkage allows a perfect fit to the dentition model.

Further, when the thermoplastic resin holding means of the present invention is processed into a shape suitable for the patient's dentition, it is heated at a certain temperature to soften it. And the holding portion are fitted to each other, so that a gap can be prevented. For this reason, even if the corrected teeth try to return to the original state, a force for pressing the teeth against the base portion is reliably generated, so that the retention of the corrected teeth can be effectively performed.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows a combination of the base 1, the holding means 2 and the support 3 suitable for carrying out the present invention.

The retaining device shown in FIG. 1 conforms to the shape of the lower jaw in the palate and is in close contact with the back surface of the dentition, a ring-shaped holding means 2 fixed to the front end of the base 1, and a base. It comprises a hook-shaped support portion 3 provided at the left and right rear ends of the portion 1.

Prior to producing the retaining device, the lower or upper jaw of the patient is first modeled. For example, the lower jaw or the upper jaw is molded with gypsum, and then the holding means 2 and the support 3 are mounted on the mold.

Prior to attachment of the holding means 2 to the model, first, the contact portion 2b with the front teeth (ie, incisors and canines) is heated at a first temperature (about 180 to 230 ° C.) and then pressed to form a rectangular cross section. And a plurality of teeth (i.e., incisors and canines) adjacent to the left and right around the tooth model are attached. Next, after a portion adjacent to the contact portion 2b is deformed into a U-shape, a second temperature (about 150 to 190) lower than the first temperature is used.
C.) to form a spring portion 2a. The spring portion 2a does not deform below the temperature at the time of formation (second temperature). Further, as the shape of the spring portion 2a, a U-shaped or wavy shape can be suitably adopted, but a wavy shape is most preferable (see FIGS. 7 and 8). Next, both ends 2c of the wire are attached to the model without deformation, the free end is wound around the first premolar or an intermediate tooth, and is extended to the back side of the tooth row, and the both ends 2c are lower than the second temperature. 3
At about 140-160 ° C. and cool. At this time, since both ends 2c contract by about 1 to 10%, the entire holding means 2 is tightened and fitted to the dentition.

Finally, a hook-shaped wire made of metal is attached to the left and right molar models to form the support portion 3. One end of this wire also extends to the back side of the dentition.

When the mounting of the holding means and the support portion on the model of the dentition is completed in this way, a molten acrylic resin is poured into the model to form the base portion 1. If left for a few minutes or more, a retaining device is obtained in which the holding means 2 and the support 3 are fixed to the base 1 having a saddle-like shape as shown in FIGS.

As a material of the base 1, a material resistant to various bacteria and stains in the oral cavity, such as an acrylic resin, is preferable. The thickness of the base portion 1 is required to be as thin as possible in order to suppress a patient's discomfort in the oral cavity after attaching the retaining device to the dentition, but it is preferable that the thickness be approximately 0.5 to 1.0 mm. preferable.

The holding means 2 may be made of polyethylene terephthalate, polybutylene terephthalate, polycarbonate, cyclohexane dimethanol-terephthalic acid copolymer, or the like. Those having relatively high strength and tensile strength and resistant to various germs and stains in the oral cavity are preferred. The shape and dimensions of the holding means are, in addition to those having a diameter of about 0.5 to 2.0 mm and a circular cross section,
A rectangular section of about (0.3 to 1.5) × (0.5 to 3.0) mm is preferably used.

Further, the holding means 2 is shown in FIGS.
As shown in FIG. 1, the first holding portion 1 adjacent to the spring portion 2a
0a, one end thereof is firmly connected to the first holding portion 10a, and the other end is provided with a second holding portion having a support portion 3 formed thereon, and a contact portion 2b.

The support portion 3 is attached to the back side of the tooth row, and is not conspicuous. Therefore, either a metal or a synthetic resin may be used, but one having relatively high bending strength and tensile strength is used. preferable. In this embodiment, the shape of the support 3 is hook-shaped (see FIG. 3).
Any shape may be used as long as it can reliably support the third molar.

In the present embodiment, the base portion is formed by the support portion 3 attached to the left and right third molars and the holding means attached so as to hang the incisors, canines and first premolars at the front end of the dentition. The base portion is stably attached to the back surface of the tooth row because it is configured to be supported at three points by the row. In addition, since the support portion 3 is attached to the corrected tooth so as to be wound, even if the corrected tooth returns to the original state before the correction, the corrected tooth is stored in the holding portion 2. Since a reaction force is generated in the direction in which the base portion is pressed, a desired correction state is maintained.

In this embodiment, the holding means is shown when the corrected teeth are at the front end of the dentition. However, when the corrected teeth are on the left and right sides of the dentition, the holding means is also used. Needless to say, two places on the left and right are required.

Also, instead of forming a plurality of holding means, FIG.
6 to 6 may be used. In this embodiment, since the holding means is formed so as to surround the entire dentition including the third molar, the holding means simultaneously serves as a support portion and a holding means. In particular, when the holding means 2 is formed, the connecting part 4 connecting the spring part 2a and the support part 3 is thermally contracted, so that the teeth of the holding means 2 as a whole are reduced by the contracting force of the connecting part 4 when attached to the dentition. The base portion 1 can be firmly fixed by pressing the base portion 1 against the front end side of the row of teeth while tightening. Further, when the corrected teeth are located on the left or right rear end side of the dentition, a support portion may be attached to the front end of the dentition in order to fix the base portion to the dentition in a stable state. However, the supporting portion attached to the front end portion is made of synthetic resin so as to be invisible.

Further, the shape is corrected at a third temperature or higher.
It becomes possible at any time below the second temperature without affecting the spring portion.

Also, the work of retightening the spring portion can be performed at any time if the temperature is higher than the second temperature.

[0030]

The holding device of the present invention uses the holding means made of thermoplastic resin as described above, so that it is not noticeable. By doing, it can be easily processed into a shape suitable for the tooth row, and can be mounted without any gap between the tooth surface of the tooth row by shrinkage after cooling, and at the same time as the normal temperature below the processing temperature. Since there is no deformation in the use state, the corrected tooth can be securely held without returning to the original state.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an embodiment of a dentition retention device of a dentition retention device of the present invention is mounted on a dentition.

FIG. 2 is a perspective view of the dentition retaining device of FIG. 1;

FIG. 3 is a plan view showing a state where the dentition retaining device of FIG. 1 is mounted on a dentition.

FIG. 4 is a perspective view showing a state in which another embodiment of the dentition retention device of the present invention is mounted on a dentition.

FIG. 5 is a perspective view of the dentition retaining device of FIG. 4;

FIG. 6 is a plan view showing a state where the dentition retaining device of FIG. 4 is attached to a dentition.

FIG. 7 is a perspective view showing a state in which still another embodiment of the dentition retaining device of the present invention is mounted on a dentition.

FIG. 8 is a perspective view of the dentition retaining device of FIG. 8;

FIG. 9 is a perspective view showing a state where the dentition retaining device of the present invention is mounted on a dentition.

FIG. 10 is a perspective view of the dentition retaining device of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base part 2 Holding means 2a Spring part 3 Support part

Claims (5)

(57) [Claims] 1. A base portion having a shape conforming to the upper or lower surface shape of the palate and having a peripheral portion formed in close contact with the back side of each tooth of the dentition, and an end portion fixed to the base portion. One or more holding means made of a thermoplastic resin which is looped around a plurality of teeth including orthodontic teeth, a spring portion for applying a biasing force to a tooth row, and the base portion And a support portion for supporting the molars, the thermoplastic resin, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, cyclohexane dimethanol-
It is selected from a synthetic resin consisting of a group consisting of terephthalic acid copolymer and is heated at a heating temperature higher than a past heating temperature within a certain temperature range, and has a property that deformation is fixed when cooled, A dentition retention device characterized by having heat shrinkability. 2. The synthetic resin has a heat shrinkage of about 1% to 1%.
The dentition retention device according to claim 1, which is 5%. 3. The tooth row holding means according to claim 1, wherein said spring portion has a corrugated shape. 4. A metal member in which the holding portion is adjacent to the spring portion and abuts against a tooth surface, and one end is connected to the first holding portion and a support portion is formed at the other end. The dentition retention device according to claim 1, comprising a second holding portion and the contact portion. 5. (a) A wire made of a thermoplastic resin having a length substantially equal to the entire length of the dentition of the upper or lower jaw is wound around the dentition model, and is substantially U-shaped having a straight portion and an arc-shaped portion. Bending into a shape, heating the portion of the arc-shaped portion that contacts the incisors and canines to a first temperature, and then pressing the portion to have a rectangular cross-section,
(B) forming a spring portion by deforming a portion adjacent to the portion in contact with the incisor and canine teeth and then heating and cooling at a second temperature lower than the first temperature;
The wire is attached to the dentition model, and the distal end of the wire is bent into a hook shape so as to be able to wrap around a molar, and the straight portion including the hook portion is bent to a third temperature lower than the second temperature.
And heating and heat shrinking after deformation at a temperature of, wherein the thermoplastic resin comprises polycarbonate, polyethylene terephthalate, polybutylene terephthalate, cyclohexane dimethanol-terephthalic acid copolymer. It is selected from a group of synthetic resins, and has a property of being fixed at a heating temperature higher than the past heating temperature in a certain temperature range and being deformed when cooled, and having a heat shrinkage property. A method of manufacturing a unique dentition retention device.