JP2019000615A - Partial denture - Google Patents

Abstract

To provide a partial denture that does not require cutting of remaining teeth or alveolar bone as in a crown bridge or implant, and can be attached without using a dental plate as in a partial plate denture while allowing removal.SOLUTION: A partial denture includes: an artificial tooth; an inner engaging member that supports the artificial tooth and engages with an inside of a tooth row; and an outer engaging member that is coupled to an inner engaging member or an artificial tooth, that is elastic, that is elastically deformed away from the inner engaging member to allow insertion of the tooth row between the inner and outer engaging members, and that is elastically restored to engage with the outside of the tooth row. The inner engaging member has first engaging sections that engage with respective inclined sections of a plurality of teeth in the tooth row, the inclined sections being inclined further in a spreading direction as getting closer to tooth roots. The outer engaging member has a second engaging section that engages with an undercut section of at least one tooth in the tooth row, the undercut section being inclined in a direction opposite to a direction in which the inclined sections are inclined.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a removable partial denture.

  Partial dentures have been used for a long time as dental prostheses for partially missing teeth. Later, crown bridges and implants have also been used. Various dental prostheses have been proposed in view of user convenience, and those described in Patent Documents 1 to 5 are examples of partial dentures.

Japanese Patent Laid-Open No. 7-236647 JP2015-109965A Japanese Unexamined Patent Publication No. 2016-196 JP 2004-254911 A JP 2004-89443 A

  Partial dentures are artificial denture bases with artificial teeth that are placed on the alveolar ridge in the missing part of the dentition. The occlusal force applied to the artificial teeth acts on the gums (mucous membrane) of the alveolar ridge. It is like that. Therefore, partial dentures have a problem that hard foods that require a strong bite force cannot be eaten.

  Some partial dentures are provided with a clasp that engages with the remaining teeth in order to apply a partial occlusal force to the remaining teeth and to stabilize the attachment of the dentures. However, according to this structure, the occlusal force acts on both the flexible gingiva and the remaining tooth that is difficult to move, and the load is unbalanced. Therefore, the burden on the remaining tooth is large, and the life of the remaining tooth is shortened. There is a problem.

  In the crown bridge, crowns integrally formed on both sides of the artificial tooth are attached to the remaining teeth positioned before and after the missing portion of the dentition. Therefore, in the crown bridge, in order to cover the remaining tooth with the crown, there is a problem that the healthy remaining tooth must be cut by the thickness of the crown.

  In the implant, an artificial tooth root is planted in the alveolar bone, and the artificial tooth is fixed to the upper end portion of the artificial tooth root. Therefore, in an implant, in order to plant an artificial dental root in an alveolar bone, there exists a problem that a gum is cut and the alveolar bone must be cut. In addition, unlike the natural tooth root, the artificial tooth root is directly planted in the alveolar bone without going through the periodontal ligament. Therefore, the implant has a problem that an appropriate cushioning property cannot be obtained. Furthermore, in the implant, there is no protective mechanism against plaques in the surrounding mucous membranes and bacteria in the oral cavity.

  Therefore, the present invention has been made in view of such circumstances, and does not involve cutting of residual teeth or alveolar bone like a crown bridge or an implant, and is mounted without using a denture base like a partial denture. It is an object of the present invention to provide a partial denture that can be removed.

The partial denture according to the present invention is
An artificial tooth placed in the missing part of the dentition,
An inner engaging member that supports the artificial tooth and engages the inside of the dentition;
It is connected to the inner engagement member or artificial tooth, has elasticity, and elastically deforms in a direction away from the inner engagement member, thereby enabling insertion of a tooth row between the inner engagement member and the inner engagement member. And an outer engaging member that engages the outside of the dentition by elastically restoring,
The inner engagement member includes a first engagement portion that engages with an inclined portion that is inclined in a direction that widens toward the root of each of the plurality of teeth in the dentition,
The outer engaging member includes a second engaging portion that engages with an undercut portion that is inclined to the opposite side of the inclined portion of at least one tooth in the dentition.

  According to this configuration, when the partial denture is mounted on the dentition, first, the partial denture is adjusted to an appropriate position with respect to the dentition and then pushed into the root side. As a result, the outer engagement member elastically changes in a direction away from the inner engagement member as the second engagement portion comes into contact with the outer surface of the tooth and moves toward the maximum ridge of the outer surface. And if a 2nd engaging part exceeds the maximum bulge part of the outer surface of a tooth | gear, an outer engaging member will be elastically restored. As a result, the pair of engaging members engage with the inside and outside of the dentition, and the partial denture is mounted on the dentition.

  When the partial denture is mounted on the dentition, the first engagement portion engages with the inside of the dentition and the second engagement portion engages with the outside of the dentition. The engaging member engages so as to sandwich the tooth row from the inside and the outside. Therefore, the partial denture is firmly attached to the dentition without moving in any of the inner and outer directions (horizontal direction) of the dentition, the occlusal direction (vertical direction), and the rotation direction with respect to the dentition.

  In addition, while the partial denture is mounted, the first engaging portion is engaged with each of the plurality of teeth in the dentition that is inclined in a direction that widens toward the root. Therefore, the occlusal force applied to the artificial tooth does not substantially act on the alveolar ridge in the defect portion and is distributed to a plurality of teeth.

  Further, while the partial denture is mounted, the second engagement portion is engaged with an undercut portion that is an inclined portion inclined to the opposite side of the inclined portion of at least one tooth in the dentition. . Therefore, the partial denture does not come out of the dentition.

  On the other hand, when removing the partial denture from the dentition, the partial denture is pulled to the occlusal side. Thus, as the second engaging portion moves toward the largest bump on the outer surface of the tooth, the outer engaging member elastically changes in a direction away from the inner engaging member, and the pair of engaging members Since the interval increases, the partial denture can be removed.

  “Inner side” means the side where the tongue is located (tongue side) when the teeth are used as a reference, and “outer side” means the front teeth (one or two incisors) when the teeth are used as a reference. And 3 canine teeth), it refers to the side with the lips (lip side), and the back teeth (4th to 7th molars) refers to the side with the cheeks (cheek side). In addition, the “tooth root side” refers to the side that approaches the tooth root in the occlusal direction (vertical direction), and the “occlusion side” refers to the side that approaches the incision if it is an anterior tooth in the occlusal direction (vertical direction). In the case of the back teeth, it means the side closer to the occlusal surface (the surface where the upper dentition and the lower dentition mesh, more specifically, the surface surrounded by the raised cusp at the top of the tooth).

  Here, as one aspect of the partial denture according to the present invention, it is a partial denture for the free ends on both sides of the dentition on both sides of the dentition where there are no teeth in the distal side than the missing part, The artificial teeth are connected to each other and are formed in an arch shape that engages the inside of the dentition, and the outer engagement member includes a pair of left and right arm portions extending from the distal side along the dentition to the mesial position. The engaging portion may employ a configuration in which a plurality of engaging portions are provided on each of the pair of arm portions corresponding to each of a plurality of teeth including the front teeth and molar teeth in the dentition.

  Further, as another aspect of the partial denture according to the present invention, it is a partial denture for a one-side free end where there is no tooth in the distal side of the missing part on the right side or the left side of the dentition, and the inner engagement member is the right side or An artificial tooth is connected to one end of the left side and is formed into an arch shape that engages the inside of the dentition, and the outer engagement member includes a pair of left and right arm portions extending from the distal side along the dentition. It is possible to employ a configuration in which a plurality of the second engaging portions are provided in each of the pair of arm portions corresponding to each of the plurality of teeth including the front teeth and the molar teeth in the dentition.

  According to these configurations, since the plurality of second engaging portions are engaged with each other on the outside of the dentition from different directions, the force of the anterior tooth side to rise to the partial denture depending on the direction of the occlusal force applied to the artificial tooth. Even if a force acts to lift either the right side or the left side, the second engaging portion in that direction mainly resists, and the partial denture can be prevented from rising.

  Note that “centrifugation” refers to the direction away from the midline (between the first incisor on the right side and the first incisor on the left side), and “messiah” refers to the direction toward the midline.

  Further, as another aspect of the partial denture according to the present invention, a configuration in which the inner engagement member includes a crown portion that covers each of one or more teeth adjacent to the missing portion can be employed.

  According to such a configuration, in combination with the pair of engaging members engaging so as to sandwich the dentition from the inside and the outside, the partial denture is in the inner and outer direction (horizontal direction) of the dentition, the occlusal direction (up and down) (Direction) and the rotation direction with respect to the dentition are firmly attached to the dentition without moving.

  As still another aspect of the partial denture according to the present invention, the arm portion is disposed on the outer surface of the gingiva, and the outer engagement member is formed from a portion corresponding to each of the plurality of teeth in the arm portion. A configuration in which a plurality of roach portions extending toward the outer surface is provided and the second engaging portion is formed at each tip portion of the plurality of roach portions can be employed.

  Further, in this case, the roach portion may employ a configuration formed in a T shape having a lateral bar portion that is curved along the outer side surface of the tooth as a second engaging portion at the distal end portion.

  As described above, according to the partial denture according to the present invention, by using the remaining tooth as it is, it is not necessary to cut the remaining tooth or the alveolar bone like a crown bridge or an implant, and the partial denture can be detachably mounted. can do. Further, according to the partial denture according to the present invention, the occlusal force applied to the artificial tooth is not burdened on the alveolar ridge via the denture base, but is distributed and burdened on a plurality of remaining teeth. Various problems can be solved.

FIG. 1A is a plan view of an upper jaw model simulating the upper jaw on which the partial denture according to the first embodiment of the present invention is mounted, and FIG. 1B is a plan view of the partial denture on the upper jaw. It is a figure which shows the state with which the model was mounted | worn, Comprising: It is a top view corresponding to Fig.1 (a). 2A is a perspective view of the upper jaw model viewed from the right side of the lower jaw, and FIG. 2B is a view showing a state in which the partial denture is mounted on the upper jaw model, and corresponds to FIG. It is a top view. FIG. 3A is a perspective view of the upper jaw model as viewed from the left side of the lower jaw, and FIG. 3B is a view showing a state in which the partial denture is mounted on the upper jaw model, and corresponds to FIG. It is a top view. FIG. 4A is a perspective view of the partial denture as viewed from the front side, and FIG. 4B is a plan view of the partial denture as viewed from the upper jaw side. 5A is a cross-sectional view taken along line AA in FIG. 1B, FIG. 5B is a cross-sectional view taken along line BB in FIG. 1B, and FIG. It is CC sectional view taken on the line of b). FIG. 6A is a plan view of an upper jaw model simulating the upper jaw on which the partial denture according to the second embodiment of the present invention is mounted, and FIG. 6B is a plan view of the partial denture on the upper jaw. It is a figure which shows the state with which the model was mounted | worn, Comprising: It is a top view corresponding to Fig.6 (a). 7A is a cross-sectional view taken along line AA in FIG. 6B, FIG. 7B is a cross-sectional view taken along line BB in FIG. 6B, and FIG. It is CC sectional view taken on the line of b).

<First embodiment>
Hereinafter, a first embodiment of a partial denture according to the present invention will be described with reference to FIGS. 1 to 5. In addition, although the partial denture based on this embodiment is mounted | worn with the dentition of an upper jaw, here, for convenience, the upper jaw model which imitated the upper jaw is used and this is considered as an actual upper jaw, and is demonstrated.

  As shown in FIGS. 1 to 4, the partial denture 1 according to the present embodiment is for prosthesis of left and right 6th and 7th molar missing portions 51, 51, and left and right first incisors 52. , 52, No. 2 incisors 53, 53, No. 3 canines 54, 54, No. 4 molars 55, 55 and No. 5 molars 56, 56. In other words, the partial denture 1 is for the so-called free ends on both sides where there are no teeth in the centrifuge than the left and right missing parts 51, 51.

  The partial denture 1 is connected to the artificial tooth 10 disposed in the defect portion 51, the inner engagement member 20 that supports the artificial tooth 10 and engages the dentition from the inside, and the artificial tooth 10, and has elasticity. Then, by elastically deforming in a direction away from the inner engagement member 20, the tooth row can be inserted between the inner engagement member 20 and elastically restored to engage the tooth row from the outside. And an engaging member 30 on the outside.

  The artificial tooth 10 is a single body imitating the shape of a tooth or a laminated body having a base coated with a well-known coating having a white color of the same color as the tooth to make it appear externally. In the present embodiment, the two adjacent molar teeth of No. 6 and No. 7 on the left and right are missing, and the artificial tooth 10 is provided with these two teeth integrally.

  The inner engagement member 20 has an arch shape that engages the entire dentition from the inside. In the present embodiment, the inner engagement member 20 includes left and right first incisors 52 and 52, second incisors 53 and 53, third canine teeth 54 and 54, fourth molars 55 and 55, and It has an arch shape that engages with the inside of the remaining dentition of the fifth molar 56, 56.

  As shown in detail in FIG. 5, the inner engagement member 20 has a gap between the end edge on the root side and the edge of the inner gum 59 in order to prevent plaque from adhering to the tooth neck. Engage inside the dentition so that it is not possible.

  Moreover, the inner engaging member 20 includes first engaging portions 21,... That engage the inclined portions of the corresponding teeth that are inclined so as to expand toward the tooth root. In the present embodiment, the inner engagement member 20 includes left and right first incisors 52 and 52, second incisors 53 and 53, third canine teeth 54 and 54, fourth molars 55 and 55, and A first engagement portion 21 is provided for each of the fifth molars 56 and 56.

  Further, the inner engagement member 20 is a portion (one occlusion of a crown) of one or a plurality of molars close to the defect portion 51 from the occlusal surface to the inner and outer inclined portions that incline in a direction extending toward the root. A crown portion 22 is provided on the side portion. In the present embodiment, the inner engagement member 20 includes a crown portion 22 for each of the left and right fourth molars 55 and 55 and the fifth molars 56 and 56.

  The inner engagement member 20 includes a spacer portion 23 having a predetermined thickness and covering the cut end portion of each mesial tooth. The spacer portion 23 extends from the end edge portion on the occlusion side of the first engaging portion 21 in each corresponding tooth, bends outward from the inside through the cutting edge, and covers the cutting edge portion of each tooth. The spacer portion 23 is formed of a transparent resin or the like so as not to stand out in appearance. In the present embodiment, the inner engagement member 20 has a spacer portion with respect to the front teeth of the first and second incisors 52 and 52, the second incisors 53 and 53 and the third canines 54 and 54. 23.

  The spacer portion 23 is integrally formed along the front tooth row. In the front tooth row, the first engaging portion 21 is continuous along the front tooth row with an intermediate portion in the occlusion direction (vertical direction) of the crown of each tooth as an end edge portion on the occlusion side. Therefore, the spacer part 23 is arrange | positioned rather than the intermediate part in the occlusion direction of the crown of each tooth | gear in the front tooth row | line | column.

  The outer engagement member 30 is located in a mesial manner along a dentition from a predetermined portion of the artificial tooth 10, more specifically, from a portion corresponding to the outer tooth neck of the artificial tooth 10 corresponding to the sixth molar. The arm part 31 extended, and the T-shaped roach part 32 extended from the site | part corresponding to each tooth | gear in the arm part 31 toward the outer surface of each tooth | gear.

  Since the arm part 31 is long, it has flexibility resulting from elasticity. The arm portions 31 are elastically deformed in a direction (outside) in which each of the roach portions 32 is separated from the inner engagement member 20, so that the interval between the roach portion 32 and the inner engagement member 20 is increased. Yes.

  The lateral bar portion 32a of the roach portion 32 is curved so as to be fitted to the outer surface of the tooth that is curved from the mesial to the centrifugal, and becomes the second engaging portion 33 that engages with the undercut portion outside the tooth. . In the present embodiment, the outer engagement member 30 includes left and right second incisors 53, 53, third canine teeth 54, 54, fourth molars 55, 55, and fifth molars having undercut portions. A second engaging portion 33 is provided for each of the teeth 56 and 56.

  The arm portion 31 is disposed on the outer surface of the gum 59. From there, the roach 32 extends to the occlusal side and reaches the outer surface of the tooth. The second engaging portion 33 (the horizontal bar portion 32a of the roach portion 32) is configured to engage closer to the maximum bulge portion in the undercut portion. In addition, since the undercut part does not necessarily exist in all the teeth (especially the front tooth), in that case, the second engaging part 34 is simply engaged with the outer surface of the tooth.

  Although not shown in the drawings, as an aesthetic treatment, a portion of the outer surface of the outer engagement member 30 that is applied to the gingiva 59 has a skin color that is the same color as that of the gingiva, and is a known coating that looks like gingiva in appearance. In addition, a portion of the outer surface of the outer engagement member 30 that is applied to the teeth may be provided with a known coating having a white color that is the same color as the teeth and appearing on the appearance. is there.

  The material of the partial denture 1 may be any material as long as it has rigidity as a partial denture and can give elasticity to the arm portion 31 of the outer engagement member 30, such as a cobalt-chromium-molybdenum alloy or the like. In addition to metals such as gold alloys, synthetic resins such as polyetheretherketone (PEEK) resin and ceramics such as zirconia can be used. In the present embodiment, the artificial tooth 10, the inner engagement member 20 (excluding the spacer portion 23), and the outer engagement member 30 are made of metal integrally molded by casting using a metal material.

  The partial denture 1 which concerns on this embodiment consists of the above structures, and demonstrates the procedure which mounts this partial denture 1 in a dentition next.

  First, after the partial denture 1 is adjusted to an appropriate position with respect to the dentition, it is pushed into the root side. As a result, the lateral bar portions 32a (second engaging portions 33) of the respective roach portions 32 of the outer engaging member 30 come into contact with the outer surface of the teeth and move toward the maximum bulge portion on the outer surface. The engagement member 30 is elastically changed in a direction away from the inner engagement member 20. And if the horizontal bar part 32a exceeds the largest bulge part of the outer surface of a tooth | gear, the outer engaging member 30 will be elastically restored. Thereby, as shown in FIG. 5, a pair of engaging members 20 and 30 engage with the inner side and the outer side of the dentition, and the partial denture 1 is attached to the dentition.

  Here, as for the partial denture 1 which concerns on this embodiment, the 2nd engaging part 33 engaged with the undercut part of each tooth | gear is formed in the outer engaging member 30. FIG. Therefore, if the partial denture 1 is left as it is, the second engaging portion 33 cannot interfere with the dentition (the ridge on the outer side surface thereof) and attach the partial denture 1 to the dentition. However, the partial denture 1 according to the present embodiment can be elastically changed so that the outer engagement member 30 is widened with the inner engagement member 20. Thereby, the 2nd engaging part 33 can be made to engage with the undercut part in the tooth root side rather than the largest bulge part on the outer side surface of each tooth, and the partial denture 1 can be dentition. Can be easily installed.

  When the partial denture 1 is mounted on the dentition, the plurality of first engagement portions 21 of the inner engagement member 20 engage with the inner side of the dentition. In addition, the plurality of second engaging portions 33,... Of the outer engaging member 30 engage with the outside of the dentition. Thereby, a pair of engaging members 20 and 30 are engaged so that a tooth row may be pinched | interposed from the inner side and the outer side. In addition, the molar portion in the dentition is covered with a crown portion 22 so as to cover the occlusal side portion of the crown. Therefore, the partial denture 1 according to the present embodiment is firmly attached to the dentition without moving in any of the inner and outer directions (horizontal direction), the occlusal direction (vertical direction), and the rotation direction with respect to the dentition. Can be installed.

  And the partial denture 1 which concerns on this embodiment is a metal rigid body, and is hard to produce bending and a deformation | transformation. Therefore, even if it is used for a long time, the engaged state does not weaken or become uneven. Thereby, the user can use a partial denture with a comfortable wearing feeling.

  Moreover, according to the partial denture 1 which concerns on this embodiment, while mounting | wearing with a dentition, several 1st engaging parts 21 and ... are several teeth in a dentition (in this embodiment, right and left No. 1 incisors 52, 52, No. 2 incisors 53, 53, No. 3 canines 54, 54, No. 4 molars 55, 55 and No. 5 molars 56, 56) It is engaged with the inclined part which inclines in the direction which spreads, so that it goes to a tooth root. Therefore, the occlusal force applied to the artificial tooth 10 does not substantially act on the alveolar ridge in the defect portion 51 and can be distributed to a plurality of teeth. As a result, hard foods that require a strong occlusal force held by partial dentures cannot be eaten, and the load is unbalanced, so the burden on the remaining teeth is large and the life of the remaining teeth is shortened. Can be solved.

  In addition, when the occlusal force is applied to the left and right artificial teeth 10, 10, even if a force is exerted on the partial denture 1 to lift the front teeth, the second incisors 53 engage with the second incisors 53, 53. The engaging portion 33 is mainly resisted and can be prevented from being lifted. Even if the right or left artificial tooth 10 is subjected to an occlusal force, even if the right or left side of the partial denture 1 is subjected to a force to lift the other side, either the right side or the left side The second engaging portion 33 that engages with the other 3rd to 5th teeth mainly resists and can also be prevented from lifting. Such a lifting prevention mechanism is also generated by the end of the second engagement portion 33 because each second engagement portion 33 has a curved shape along the outer surface of the tooth. Is. Therefore, the partial denture 1 according to the present embodiment can be applied in any direction of the inner and outer directions (horizontal direction) of the dentition, the occlusal direction (vertical direction), and the rotation direction with respect to the dentition, no matter how the occlusal force is applied. It can be firmly attached to the dentition without moving.

  And the partial denture 1 which concerns on this embodiment is a metal rigid body, and is hard to produce bending and a deformation | transformation. Therefore, even if it is used for a long time, the engaged state does not weaken or become uneven. As a result, there is no problem in that the effect of dispersion of the occlusal force is biased, and the occlusal force acts excessively on a specific tooth to shorten the life of the tooth.

  Moreover, the partial denture 1 which concerns on this embodiment installs using a residual tooth as it is. This eliminates the need to cut the remaining teeth in order to align the partial dentures like a crown bridge. Therefore, it has a very large effect for the user that the loss of the healthy tooth can be prevented.

  Further, in the partial denture 1 according to the present embodiment, the height of the tooth covered with the crown portion 22 is increased by the thickness of the crown portion 22, so that the artificial tooth 10 is also higher than the original missing tooth. In addition, the front teeth are covered with a spacer portion 23 having a predetermined thickness. Thereby, when the remaining dentition is not properly meshed, the meshing can be corrected (reconstructed).

<Second Embodiment>
Next, a second embodiment of the partial denture according to the present invention will be described with reference to FIGS.

  The partial denture 1 according to the present embodiment is not a bilateral free end as in the first embodiment, but a single free end (in this embodiment, the left 6th molar and left 7th molar missing). It is. Therefore, although it is fundamentally the same structure as the partial denture 1 which concerns on 1st embodiment, since a right artificial tooth 10 becomes unnecessary in this embodiment, the difference is a right outer engagement. The joint member 30 is a point connected to the right end portion of the inner engagement member 20 via the connecting portion 31a. Specifically, in the present embodiment, the inner engagement member 20 has a length in the row direction that can be engaged to the right fifth molar 56, and the right fifth molar on the right end. And a connecting portion 31a extending from the outside to the inside through the interproximal portion between the right and sixth right molars. In the present embodiment, the right outer engagement member 30 is integrally formed with the inner engagement member 20 and connected to the inner engagement member 20.

  Another difference is that the present embodiment does not correct the meshing. Therefore, in this embodiment, the crown part 22 and the spacer part 23 of the partial denture 1 which concern on 1st embodiment are not provided. Therefore, as shown in FIG. 7 (b), the inner engagement member 20 has a height dimension that covers almost the entire inner surface of the teeth with respect to the left and right molars 55, 56, and the first engagement. The portion 21 is formed at the end edge portion on the occlusion side of the inner engagement member 20. However, when the first engaging portion 21 advances to the occlusal surface of the molars 55 and 56, the lower jaw teeth and the first engaging portion 21 come into contact with each other, and the meshing of the teeth changes. Therefore, the first engagement portion 21 is engaged with a portion of the molars 55 and 56 that is inclined in a direction that widens toward the root, not on the occlusal surface, for example, a portion slightly on the root side of the occlusal surface. It comes to match. The same applies to the connecting portion 31a of the engagement member 30 on the right outer side.

  Even with the partial denture 1 according to the present embodiment, the same effects as those of the partial denture 1 according to the first embodiment can be obtained.

  In addition, the partial denture based on this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the first embodiment, the meshing is corrected. In the second embodiment, the meshing is not corrected. However, in the first embodiment, the crown portion 22 and the spacer portion 23 may not be provided (the meshing correction is not performed). In the second embodiment, the crown portion 22 and the spacer portion 23 are not provided. It may be provided (correction of meshing).

  Moreover, in the said embodiment, the 1st engaging part 21 engages with all the teeth of a residual tooth row | line | column, and it remove | excludes the second tooth with respect to all the teeth of a residual tooth row | line | column except the 1st left and right cutting teeth 52 and 52. The engaging portion 33 is engaged. However, the number of the first engaging portions 21 and the second engaging portions 33 may be reduced as long as the effects of the present invention are not impaired.

  Moreover, in the said embodiment, the outer engaging member 30 is provided with the arm part 31, and the roach part 32 extended toward the outer surface of each tooth | gear from the site | part corresponding to each tooth | gear in the arm part 31, 2nd. The engaging portion 33 is formed at the tip end portion (lateral bar portion 32) of the roach portion 32. However, the formation of the second engaging portion 33 is not limited to this form. For example, the roach portion 32 is not provided, and the second engagement portion 33 is formed at the occlusal end edge portion of the inner engagement member 20 (arm portion 31), and is mainly engaged with the tooth neck portion. Also good.

  Moreover, in the said embodiment, the roach part 32 is formed in the T shape which has the horizontal bar part 32a which curves along the outer surface of a tooth | gear as the 2nd engaging part 33 in a front-end | tip part. However, the roach portion 32 may have other shapes such as an I shape, an L shape, and a U shape.

  Moreover, the partial denture 1 which concerns on the said embodiment is a partial denture with respect to the free end of both sides or one side. However, it may be a partial denture for an intermediate defect in which natural teeth remain in the centrifuge rather than the defect part 51. In this case, for the 7th molar (or 8th molar if present), the configuration of the partial denture 1 according to the first embodiment with respect to the 4th and 5th teeth (with the crown portion 22). And a configuration for the fourth and fifth teeth of the partial denture 1 according to the second embodiment (the crown portion 22 is not provided and the first engagement portion 21 is engaged around the occlusal surface). To be adopted).

  The partial denture 1 according to the first embodiment is a partial denture for both free ends, and the partial denture 1 according to the second embodiment is a partial denture for one free end. However, in the partial denture 1 according to the first embodiment, the partial denture in a form in which the opposite side of the right side or the left side of the partial tooth 1 to the front teeth 52 to 54 is removed from the side opposite to the missing part 51. Can be employed as a partial denture for a free end on one side.

  In addition, the number of teeth with which the first engaging portion 21 is engaged is preferably at least three from the viewpoint of suitably dispersing the occlusal force applied to the artificial tooth 10. This also depends on the number of missing teeth, and the first engaging portion 23 is preferably engaged with a number of teeth that is twice or more the number of missing teeth.

  DESCRIPTION OF SYMBOLS 1 ... Partial denture, 10 ... Artificial tooth, 20 ... Inner engagement member, 21 ... First engagement part, 22 ... Crown part, 23 ... Spacer part, 30 ... Outer engagement member, 31 ... Arm part, 31a ... Connection end part, 32 ... Loach part, 32a ... Horizontal bar part, 33 ... Second engaging part, 50 ... Upper jaw, 51 ... Defect part, 52, 53 ... Incisor, 54 ... Canine, 55-58 ... Molars, 59 ... Gingiva

Claims (6)

An artificial tooth placed in the missing part of the dentition,
An inner engaging member that supports the artificial tooth and engages the inner side of the dentition;
It is connected to the inner engagement member or the artificial tooth, has elasticity, and elastically deforms in a direction away from the inner engagement member, so that the dentition is placed between the inner engagement member and the inner engagement member. An outer engagement member that engages with the outside of the dentition by allowing insertion and elastic recovery,
The inner engagement member includes a first engagement portion that engages with an inclined portion that is inclined in a direction that widens toward the root of each of the plurality of teeth in the dentition,
The outer engaging member includes a second engaging portion that engages with an undercut portion that is inclined to the opposite side of the inclined portion of at least one tooth in the dentition. Partial dentures for both sides free end where there is no tooth in the distal side than the missing part on both sides of the dentition,
The inner engagement member is formed in an arch shape in which the artificial tooth is connected to each of both end portions and engaged with the inner side of the dentition,
The outer engaging member includes a pair of left and right arm portions extending from the distal side along the dentition to the mesial position,
2. The partial denture according to claim 1, wherein a plurality of the second engaging portions are provided on each of the pair of arm portions corresponding to each of a plurality of teeth including anterior teeth and molars in the dentition. A partial denture for a one-side free end that has no teeth in the centrifuge rather than the missing part on the right or left side of the dentition,
The inner engagement member is formed in an arch shape in which the artificial tooth is connected to one side end portion on the right side or the left side and engaged with the inner side of the dentition,
The outer engaging member includes a pair of left and right arm portions extending from the distal side along the dentition to the mesial position,
2. The partial denture according to claim 1, wherein a plurality of the second engaging portions are provided on each of the pair of arm portions corresponding to each of a plurality of teeth including anterior teeth and molars in the dentition.   The partial denture according to claim 2 or 3, wherein the inner engaging member includes a crown portion that covers each of one or more teeth adjacent to the missing portion. The arm portion is disposed on the outer surface of the gingiva,
The outer engagement member includes a plurality of roach portions extending from a portion corresponding to each of the plurality of teeth in the arm portion toward an outer surface of each tooth,
The partial denture according to any one of claims 2 to 4, wherein the second engagement portion is formed at a tip portion of each of the plurality of roach portions.   The partial denture according to claim 5, wherein the roach portion is formed in a T shape having a lateral bar portion that is curved along an outer surface of the tooth as a second engaging portion at a distal end portion.

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