JP2007014461A - Production aid of model for denture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production aid of a model for a denture which can precisely reproduce a virtual occlusal plane and can drastically improve the parallelism between the virtual occlusal plane and a model basal surface. <P>SOLUTION: The production aid of the model for the denture 1 comprises a front contact section 11 which can be in contact with a first reference position located on the front side of the model of the upper jaw or the lower jaw, a back contact section 12 which can be in contact with a second reference position located on both the left and right sides of the further back side than the first reference position, and a base 13 which connects the contact section 11 and the contact section 12 and has a plane section h on a surface. The projection length a from the plane section h of the front contact section 11 and the projection length b from the plane section h of the back contact section 12 are set to be the prescribed reference values. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a manufacturing aid for a denture model manufactured during the manufacturing process of a denture such as a complete denture.

A general method for preparing a complete denture is as follows. First, the upper and lower jaw models are made of plaster on the basis of the impression taken in the oral cavity of the patient's upper and lower jaws, and an occlusal floor is formed on the plaster model with wax. And after attaching wax dentures with artificial teeth on the occlusal floor in the articulator and the patient's mouth and performing fine adjustment (obtaining occlusion) such as meshing and tooth alignment, the wax part of the wax dentures Replace with resin to get dentures. This replacement with resin is performed by burying wax dentures in the gypsum for implantation, heating the gypsum after heating to remove the wax, pouring the resin into the space obtained by this wax, and then polymerizing the resin. It is performed by curing (for example, see Patent Document 1).
JP-A-9-238958

  Since patients who need dentures do not have some or all of their teeth, the occlusal plane (the mating surface of the upper and lower jaw teeth) is first assumed when creating the occlusal floor. Then, it is necessary to produce an occlusal floor corresponding to this virtual occlusal plane, and to make the end face of the artificial tooth implanted coincide with the virtual occlusal plane with high accuracy. When the shift between the occlusal floor and the occlusal plane is large, much time and labor are required for subsequent occlusion acquisition.

  The distance between a specific reference position on the intraoral surface of the edentulous jaw and the occlusal plane is generally grasped as a reference value based on an anatomical average value. Therefore, it is possible to determine the virtual occlusal plane even from an edentulous model in which all teeth are lost. However, in the case of an edentulous jaw, for example, the maxillary or mandibular model in which the intraoral impression is reproduced has no reference to indicate the virtual occlusal plane, so it is easy to create an occlusal floor that accurately corresponds to the virtual occlusal plane. is not.

  Here, in order to make the occlusal floor correspond to the virtual occlusal plane with high accuracy, it is effective to make the basal plane (bottom surface) of the model parallel to the virtual occlusal plane before the formation of the occlusal floor. In this case, since the height from the basal plane of the model to the virtual occlusal plane is constant, the upper surface of the occlusal floor (or the end face of the artificial tooth) and the virtual occlusal plane can be obtained simply by keeping the height from the basal plane constant. Can be matched.

  In order to make the basal plane of the model parallel to the virtual occlusal plane, it is considered to trim the basal plane with a trimer etc. while measuring the distance between each reference position and the basal plane with calipers etc. based on the reference value described above. It is done. However, in this case, since there are errors in the operator's line of sight and during trimming, it is extremely difficult to obtain a model basal plane with high parallelism to the virtual occlusal plane.

  The present invention has been made in view of such a situation, and can assist in the production of a denture model that can accurately reproduce a virtual occlusal plane and contribute to the production of a model base surface having high parallelism with the virtual occlusal plane. The purpose is to provide ingredients.

  The present invention includes a front abutting portion capable of abutting on a first reference position located on a front side of a model of an upper jaw or a lower jaw obtained based on taking an impression in an oral cavity, and the front abutting on the first reference position. In a state in which the contact portion is in contact, a rear contact portion that can be in contact with a second reference position that is on the rear side of the first reference position and on both the left and right sides, the front contact portion, and the rear contact And a base portion having a flat portion on one surface, and a protruding length of the front abutting portion from the flat portion is set to a predetermined first reference value, and the rear abutting portion is connected. The protrusive length of the portion from the flat portion is set to a predetermined second reference value.

  By using such a production aid and setting each reference value to an appropriate value based on an anatomical average value, the plane portion of the production aid placed on the model is virtually occluded. The plane can be accurately reproduced. Therefore, it is possible to accurately grasp the virtual occlusal plane even from a model without teeth. Moreover, the parallelism of a virtual occlusal plane and a model basal plane can be improved by making the said plane part which reproduced the virtual occlusal plane, and the basal plane of a model parallel.

The production assisting tool is roughly classified into an upper jaw model and a lower jaw model, and the following is preferable for the upper jaw model. That is, the model is a maxillary model obtained based on obtaining an impression in the maxillary oral cavity, and the first reference position is an intermediate incisor gingival lip transition portion at the time of a dentition in the maxilla, The two reference positions are preferably Hammer notches located on the left and right sides.
In this case, since the reference position in the upper jaw model is appropriately set, the reproduction accuracy of the virtual occlusal plane by the plane portion is further increased.

  Further, in the manufacturing aid for the upper jaw model, the front contact portion protrudes from the front edge portion of the base portion, and the rear contact portion moves in the front-rear direction with respect to the base portion. It is preferable to be provided on a member that is capable of rotating in the in-plane direction of the plane portion.

  By projecting the front abutting portion into a bifurcated shape, it is possible to avoid the front abutting portion from hitting the upper lip band. Therefore, the front-end | tip of a front contact part can be made to contact | abut correctly by a middle incisor gingival transition part. In addition, the positional relationship between the central incisor gingival lip transition portion and the Hammerer notch and the positional relationship between the left and right Hammerer notches differ depending on the patient. Can be made to correspond to each patient. Therefore, it can be set as a highly versatile production aid. Moreover, since the said back contact part is provided in the member attached so that rotation was possible in the surface direction of the said plane part, the protrusion length from the plane part of a back contact part does not change by rotation. Therefore, the virtual occlusal plane can be accurately reproduced while adjusting the contact position of the rear contact portion by turning.

Moreover, the following are preferable for the lower jaw model. The model is a mandibular model obtained based on taking an impression in the oral cavity of the lower jaw, and the first reference position is an intermediate incisor gingival lip transition portion at the time of a dentition in the lower jaw, and the second reference The position is preferably the posterior triangle on the left and right sides.
In this case, since the reference position in the lower jaw model is set appropriately, the reproduction accuracy of the virtual occlusal plane by the plane portion is further increased.

  In the manufacturing aid for the lower jaw, the front abutting portion protrudes in a bifurcated manner from the front edge portion of the base portion, and the rear portion of the base portion is provided on each of the left and right sides of the rear edge portion of the base portion. A rotating member that protrudes outward from the left and right sides of the edge portion and is rotatable in the in-plane direction of the flat surface portion is provided, and the rear abutting portion is provided on the rotating member. It is preferable.

  By projecting the front abutting portion into a bifurcated shape, it is possible to avoid the front abutting portion from hitting the lower lip band. Therefore, the front-end | tip of a front contact part can be made to contact | abut correctly by a middle incisor gingival transition part. In addition, the positional relationship between the central incisor gingival lip transition portion and the posterior trigonal triangle and the positional relationship between the left and right posterior triangular portions differ depending on the patient. Can be made to correspond to each patient. Therefore, it can be set as a highly versatile production aid. Further, since the rear abutting portion is provided on a rotating member attached so as to be rotatable in the in-plane direction of the flat portion, the protruding length of the rear abutting portion from the flat portion is changed by the rotation. do not do. Therefore, the virtual occlusal plane can be accurately reproduced while adjusting the contact position of the rear contact portion by turning.

  Since it is an auxiliary tool that can simultaneously contact multiple reference points on the jaw model and accurately reproduce the virtual occlusal plane, it can accurately grasp the virtual occlusal plane in the jaw model and improve the accuracy of the denture model. it can.

Embodiments of the present invention will be described below with reference to the drawings.
The denture model production assistance tool of the present embodiment includes an upper jaw production assistance tool 1 that is a production assistance tool for an upper jaw model and a lower jaw production assistance tool 2 that is a production assistance tool for a lower jaw model.

  1 and 2 are views showing a state in which the upper jaw production assisting tool 1 is placed on the upper jaw model 3, FIG. 1 is a side view, and FIG. 2 is an upper side (from the upper jaw production assisting tool 1 installation side). It is the seen top view. In FIG. 2, the upper jaw production assisting tool 1 is indicated by a broken line for easy understanding, and the upper jaw model 3 is indicated by a solid line including a portion covered by the upper jaw manufacturing aid 1. As shown in FIG. 1, when using the production support tool 1 for the upper jaw, the impression surface 31 (the surface in which the shape of the upper oral cavity is reproduced) 31 of the upper jaw model 3 is set on the upper side. The upper jaw production assisting tool 1 is placed. The upper jaw production assisting tool 1 has a size and shape substantially corresponding to the impression surface 31 of the upper jaw model 3 as a whole. In the state of FIG. 1 in which the upper jaw production assisting tool 1 is placed on the upper jaw impression surface 31 of the upper jaw model 3, the plane portion h of the upper jaw production auxiliary tool 1 reproduces the virtual occlusal plane p.

  3 and 4 are views showing a state where the mandibular production aid 2 is placed on the mandibular model 4, FIG. 3 is a side view, and FIG. 4 is an upper view (the mandibular production aid 2 installation side). ). In FIG. 4, the mandibular production assisting tool 2 is indicated by a broken line for easy understanding, and the lower jaw model 4 is indicated by a solid line including a portion covered with the mandibular production assisting tool 2. As shown in FIG. 3, when using the mandibular production assisting tool 2, the impression surface 41 of the lower jaw model 4 (the surface in which the shape of the upper jaw oral cavity is reproduced) is set on the upper side. The mandibular production assisting tool 2 is placed on. The lower jaw production assisting tool 2 has a size and shape substantially corresponding to the impression surface 41 of the lower jaw model 4 as a whole. In the state of FIG. 3 in which the mandibular production assisting tool 2 is placed on the lower jaw impression surface 41 of the lower jaw model 4, the plane part h of the mandibular production assisting tool 2 reproduces the virtual occlusal plane p.

  In preparing a denture, it is necessary to plant teeth (artificial teeth) with reference to the virtual occlusal plane, so accurate grasping of the virtual occlusal plane is extremely important. FIG. 5 is a side view that reproduces the state of the mouth of the human body with the upper jaw model 3 and the lower jaw model 4 in order to facilitate understanding of the virtual occlusal plane p. As shown in the figure, by making the virtual occlusal plane p coincide with the occlusal plane at the time of the toothed jaw, a denture suitable for the patient can be produced. An occlusal floor having a large error from the virtual occlusal plane p requires a lot of time and labor to obtain an occlusion in the oral cavity. Therefore, it is important to accurately grasp the virtual occlusal plane p at the model stage and to produce an occlusal floor with a small error from the virtual occlusal plane p.

  However, since the upper jaw model 3 and the lower jaw model 4 are both edentulous models and do not have teeth, a virtual occlusal plane p (shown by a broken line in FIGS. 1 and 3) cannot be set based on the teeth. . Therefore, it is not easy to produce an occlusal floor with little error from the virtual occlusal plane p. Even in such an edentulous jaw model, the upper jaw production assistance tool 1 and the lower jaw production assistance tool 2 can accurately reproduce the virtual occlusal plane p. Thus, the upper jaw production assisting tool 1 and the lower jaw production assistance tool 2 are particularly effective when used as a production aid for a complete denture model.

  Here, in order to facilitate understanding of the present invention, a procedure for manufacturing the upper jaw model 3 and the lower jaw model 4 will be described. Hereinafter, the upper jaw model 3 will be described as an example, but the same applies to the lower jaw model 4. First, the impression in the oral cavity of the patient's upper jaw is modeled using a personal tray or modeling compound. Next, gypsum is poured into the tray and cured, and the impression surface obtained by the modeling compound or the like is transferred to the gypsum. Thereby, an initial plaster mold (not shown) that reproduces the obtained impression surface in the oral cavity is produced. Subsequently, additional plaster is placed on the surface opposite to the impression surface 31 in the initial plaster mold to form a model base portion md (see FIGS. 1 and 3).

  As described above, in order to improve the production accuracy of the denture and increase the production efficiency, it is extremely effective to form the model base surface k (see FIGS. 1 and 3) parallel to the virtual occlusal plane p. Therefore, in this embodiment, the production assisting tool 1 is placed at a predetermined position on the impression surface 31 of the plaster mold (that is, the above-described initial plaster mold) before the model base portion md is formed. In this way, the virtual occlusal plane p is reproduced by the plane portion h of the production aids 1 and 2. In this state, while forming the model base portion md, the model base surface k which is the bottom surface of the model base portion md is formed in parallel with the plane portion h. That is, the manufacturing aid 1 is placed at a predetermined position on the impression surface 31 of the initial plaster mold, and the model is parallel to the plane portion h until the plaster deposited on the opposite side of the impression surface 31 is cured. A basal plane k is formed. Specifically, an initial gypsum mold with a built-up additional gypsum on the bottom and a production aid placed on the top is placed on a reference plane (for example, the top surface of a desk), and the plane h and the reference plane are parallel. The additional plaster is deformed while adjusting the position of the model so as to become. When the additional gypsum is cured, the reference plane is transferred to the additional gypsum, and a model base surface k parallel to the plane portion h (that is, the virtual occlusion plane p) is formed. If it does in this way, the model base face k with high parallelism with virtual occlusion plane p can be formed, without shaving gypsum. Therefore, the parallelism between the model base surface k and the virtual occlusal plane p is increased, and the gypsum is not wasted because it is not cut. Of course, the model base surface k may be produced by cutting the gypsum along the plane part h of the production aid placed on the impression surface.

  Next, the production support tool 1 for the upper jaw and the production support tool 2 for the lower jaw will be described in detail. Each of these production aids 1 and 2 has such a shape that it can be placed on the jaw model in contact with only three or more reference positions defined on the jaw model. Since the production aids 1 and 2 are stabilized if supported at three locations, the reference position may basically be at three locations. Each of the production assisting tools 1 and 2 has an adjustment mechanism that can cope with the positional relationship between the reference positions that differ depending on the individual patient. These production aids are made of a known material such as resin or metal.

  6 shows the upper jaw production assisting tool 1, FIG. 6 (a) is a plan view seen from the flat surface h side, FIG. 6 (b) is a front view seen from the front, and FIG. 6 (c) is a side view. In the present application, the front side (lip side) in the oral cavity of the human body is referred to as the front, and the back side (throat side) is referred to as the rear. Moreover, when referring to the front or back of the auxiliary tool, it means the front or rear in a state where the auxiliary tool is placed on the model in a normal use state (the state shown in FIGS. 1 to 4).

  The upper jaw production assisting tool 1 is an upper jaw front abutting portion 11 as a front abutting portion capable of abutting on a first reference position located on the front side of the upper jaw model 3 obtained based on obtaining an impression in the oral cavity. And a rear abutting portion 12 for the upper jaw as a rear abutting portion that can abut on a second reference position that is located on the rear side of the first reference position and on both the left and right sides. Further, the upper jaw production assisting tool 1 connects the upper jaw front contact portion 11 and the upper jaw rear contact portion 12 and includes an upper jaw base portion 13 as a base portion having a flat surface h on one surface. Yes. The rear edge of the maxillary rear abutment portion 12 has a protruding edge portion 12 a that projects in the same direction as the upper jaw front abutment portion 11.

The protrusion length from the flat surface portion h (the length in a direction perpendicular to the flat surface portion h) of the upper anterior contact portion 11 for the upper jaw (the tip of the protruding end 11a) is for the upper jaw as a predetermined first reference value. The first reference value a is set (see FIGS. 6B and 6C). In addition, the protruding length from the flat surface portion h (the length in the direction perpendicular to the flat surface portion h) of the upper jaw rear abutting portion 12 (the tip of the protruding edge portion 12a) is a predetermined second reference value. Is set to the second reference value b for the upper jaw (see FIGS. 6B and 6C).
The upper jaw production assisting tool 1 is placed on the upper jaw model 3 with the upper jaw front contact portion 11 in contact with the first reference position and the upper jaw rear contact portion 12 in contact with the second reference position. The shape can be placed. The upper jaw production assisting tool 1 has a shape that can be placed on the upper jaw impression surface 31 of the upper jaw model 3 in contact with only the first reference position and the second reference position.

  The structure of the production support tool 1 for the upper jaw will be described more specifically. The upper jaw production assisting tool 1 has a first member 101 having an upper jaw base portion 13 and an upper jaw front abutting portion 11, an upper jaw rear abutting portion 12, and is separated from the first member 101. It has the 2nd member 102 and the connection member 103 which consists of a volt | bolt and a nut and connects the 1st member 101 and the 2nd member 102. FIGS. 7A to 7C are diagrams in which only the second member 102 is extracted and illustrated in each of FIGS. 6A to 6C.

  Corresponding to the impression in the oral cavity being substantially bilaterally symmetric, the first member 101 and the second member 102 have symmetric shapes. In addition, an elongated hole 101a extending in the front-rear direction is provided at the center position in the left-right direction of the first member 101. The second member 102 is provided with a through hole 102a. The first member 101 and the second member 102 are connected by the nut of the connecting member 103 passing through the elongated hole 101 a of the first member 101 and the through hole 102 a of the second member 102. Therefore, the second member 102 is attached to the first member 101 so as to be movable in the front-rear direction and to be rotatable in the in-plane direction of the flat portion h.

  In the first member 101, the upper jaw front contact portion 11 protrudes from the front edge portion of the upper jaw base portion 13 in a substantially bifurcated shape. In the upper jaw manufacturing aid 1, the first reference position is the middle incisor gingival lip transition portion 32 in the upper jaw model 3 at the time of the toothed jaw (see FIGS. 1 and 2). As shown in FIG. 2, there are a total of two intermediate incisor gingival lip transition portions 32 in each of the left and right sides. The upper anterior contact portion 11 for the upper jaw is a central incisor gingiva in these two locations. The shape can be brought into contact with the lip transition portion 32. That is, each of the substantially bifurcated projecting ends 11 a of the upper jaw front abutting portion 11 comes into contact with the left and right middle incisor gingival lip transition portions 32. The interval between the two projecting ends 11a is set corresponding to the interval between the left and right intermediate incisor gingival lip transition portions 32 (the deepest portion thereof), and is preferably 10 mm. By making the upper jaw front contact portion 11 substantially bifurcated, it is possible to avoid the upper jaw front contact portion 11 from hitting the upper lip band 33 (see FIG. 2). In other words, the upper jaw front abutting portion 11 has a shape capable of avoiding abutment with the upper lip band 33 while abutting the two projecting ends 11 a with the intermediate incisor gingival lip transition portion 32. . Therefore, the protruding end 11 a of the upper jaw front contact portion 11 can be accurately brought into contact with the intermediate incisor gingival lip transition portion 32 without being interfered with the upper lip band 33.

  The second member 102 has a rear edge portion 102b extending in the left-right direction, and the rear edge portion 102b constitutes the upper jaw rear contact portion 12. The rear edge portion 102b has a protruding edge portion 12a that protrudes in the same direction as the upper jaw front contact portion 11 in the state of being the upper jaw manufacturing aid 1. In the upper jaw manufacturing aid 1, the second reference position is the Hammer notch 34 located on both the left and right sides, the left side portion of the protruding edge 12a abuts on the left Hammer notch 34, and the protruding edge 12a It abuts on the right-hand side of the right-side Hammer notch 34. Further, the tip of the protruding edge portion 12a is in contact with the Hammeller notch 34.

  Further, the production support tool 1 for the upper jaw is configured so that the incisor papilla of the upper jaw model 3 does not hit in a state where the contact portions 11 and 12 are in contact with the reference positions 32 and 34 (hereinafter also referred to as a reference state). The through-hole 15 for carrying out is provided (refer FIG.6 (b)). Further, the upper jaw production assisting tool 1 includes the blade jaw lower fold 35 of the upper jaw model 3 and the upper jaw production assistance tool 1 in the process of placing the upper jaw production assistance tool 1 on the upper jaw model 3 so as to be in the above-mentioned reference state. Concave portions 16 are provided on each of the left and right sides (see FIG. 6A). Therefore, when the upper jaw production assisting tool 1 is placed on the upper jaw model 3, the wing protrusion lower jaw fold 35 is less likely to get in the way and workability is improved. In order to provide the recess 16, the rear portion of the first member 101 is narrowed in the left-right direction. In order to provide the recess 16, the front part of the second member 102 is narrowed in the left-right direction width, and the rear part of the second member 102 is widened in the left-right direction to have a wing shape.

FIG. 8 shows the mandibular production assisting tool 2, FIG. 8 (a) is a plan view seen from the plane h side, FIG. 8 (b) is a front view seen from the front, and FIG. 8 (c) is a side view.
The mandibular production assisting tool 2 is a mandibular front abutting portion 21 as a front abutting portion that can abut on a first reference position located on the front side of the mandibular model 4 obtained on the basis of an impression in the oral cavity. And a lower jaw rear abutting portion 22 as a rear abutting portion capable of abutting on a second reference position located on the left side and on the left and right sides of the first reference position. Further, the mandibular production assisting tool 2 connects the lower jaw front contact portion 21 and the lower jaw rear contact portion 22 and includes a lower jaw base portion 23 as a base portion having a flat surface h on one surface. Yes. The lower jaw rear abutting portions 22 are provided on the left and right sides of the lower jaw base portion 23 at the rear.

The protrusion length (length in the direction perpendicular to the plane portion h) of the lower jaw front abutting portion 21 (the tip thereof) from the plane portion h is a first reference value c for the lower jaw as a predetermined first reference value. (See FIGS. 8B and 8C). Further, the protruding length from the flat surface h (the length in the direction perpendicular to the flat surface h) of the lower jaw rear contact portion 22 (the tip thereof) is a second lower jaw value as a predetermined second reference value. The reference value d is set (see FIG. 6C).
The mandibular production assisting tool 2 is placed on the lower jaw model 4 with the lower jaw front contact portion 21 in contact with the first reference position and the lower jaw rear contact portion 22 in contact with the second reference position. The shape can be placed. The mandibular production assisting tool 2 has a shape that can be placed on the lower jaw impression surface 41 of the lower jaw model 4 in contact with only the first reference position and the second reference position.

  The structure of the mandibular production aid 2 will be described more specifically. The lower jaw production assisting tool 2 has a first member 201 having a lower jaw base portion 23 and a lower jaw front contact portion 21, a lower jaw rear contact portion 22, and is separated from the first member 201. It has the 2nd member 202 as a rotation member, and the connection member 203 which consists of a volt | bolt and a nut and connects the 1st member 201 and the 2nd member 202. A total of two second members 202 are provided on the left and right sides of the first member 201, and are attached to the first member 201 so as to be rotatable.

  Corresponding to the impression in the oral cavity being substantially bilaterally symmetric, the first member 201 has a bilaterally symmetric shape, and the two second members 202 are also attached bilaterally symmetric. A through hole 201 a is provided on each of the left and right rear sides of the first member 201. The second member 202 is also provided with a through hole 202a. The first member 201 and the second member 202 are connected by the nut of the connecting member 203 passing through the through hole 201 a of the first member 201 and the through hole 202 a of the second member 202. Therefore, the second member 202 is attached to the first member 201 so as to be rotatable in the in-plane direction of the plane portion h. The second member 202 protrudes outward from the lower jaw base portion 23 (or the first member 201), and has a shape that becomes thinner toward the outer side of the lower jaw base portion 23. The portion where the second member 202 is installed in the first member 201 has a step having the same height as the thickness of the second member 202. Thereby, the upper surface 202j of the second member 202 is flush with the flat surface portion h. Therefore, the upper surface 202j of the second member 202 is also a surface that reproduces the virtual occlusal plane p.

  In the first member 201, the lower jaw front contact portion 21 protrudes from the front edge portion of the lower jaw base portion 23 in a bifurcated manner. In the mandibular production assisting tool 2, the first reference position is the middle incisor gingival lip transition portion 42 in the mandibular model 4 at the time of the toothed jaw (see FIGS. 3 and 4). As shown in FIG. 4, there are a total of two intermediate incisor gingival lip transition portions 42 in each of the left and right sides, but the lower jaw front abutment portion 21 is the middle incisor gingiva of these two locations. The shape can be brought into contact with the lip transition portion 42. That is, each of the substantially bifurcated projecting ends 21a of the lower jaw front abutting portion 21 abuts on the left and right middle incisor gingival lip transition portions 42, respectively. The mutual interval between the two projecting ends 21a corresponds to the interval between the left and right middle incisor gingival lip transition portions 42 (the deepest portion thereof), and is preferably 8 mm. By making the lower jaw front contact portion 21 substantially bifurcated, it is possible to avoid the lower jaw front contact portion 21 from hitting the lower lip band 43 (see FIG. 4). In other words, the lower jaw front abutting portion 21 is shaped so as not to abut on the lower lip band 43 in a state where the two projecting ends 21 a are abutted against the intermediate incisor gingival lip transition portion 42. Therefore, the protruding end 21a of the lower jaw front abutting portion 21 can be accurately brought into contact with the intermediate incisor gingival lip transition portion 42 without being interfered with the lower lip band 43.

  The portion of the second member 202 that contacts the lower jaw model 4 is the left and right outer edge 202b of the second member 202. In the mandibular production assisting tool 2, the second reference position is the posterior triangle 44 located on both the left and right sides. The posterior triangle 44 is a region having a substantially triangular shape in the plan view of FIG. 4, but the posterior triangle 44 has a slope shape that becomes higher from the front side toward the rear side as shown in FIG. Therefore, the entire left and right outer edge 202b of the second member 202 does not abut against the posterior triangle 44, but a part (substantially one point) of the left and right outer edge 202b abuts the posterior triangle 44. In other words, any one of the left and right outer edges 202b is brought into contact with the posterior triangle 44. The second member 202 is rotated so that the laterally outer edge 202b is in contact with a desired height position (such as H2 and H3 described later) of the posterior triangle 44. It is preferable to temporarily fix the rear mortar triangle 44 and the second member 202 by brazing or the like because displacement of the contact position can be prevented.

  Using the production aids 1 and 2 as described above, and setting each of the reference values a, b, c, and d to appropriate values based on the anatomical average value, the sample was placed on the model. The plane part h of the production assistants 1 and 2 in the state (the state shown in FIGS. 1 to 4) reproduces the virtual occlusal plane p with high accuracy. Therefore, it is possible to accurately grasp the virtual occlusal plane p. Moreover, the parallelism of the virtual occlusal plane p and the model basal plane k can be improved by making the plane part h reproducing the virtual occlusal plane p parallel to the basal plane k of the models 3 and 4.

  In the above-mentioned production assisting tool 1 for the upper jaw, the middle incisor gingival lip transition portion 32 at the time of the toothed jaw in the upper jaw was set as the first reference position, and the Hammer notches 34 on both the left and right sides were set as the second reference position. The reference position is the central incisor gingival lip transition part 32 and the Hammüller notch 34. The distance (height) from these reference positions to the virtual occlusal plane p is accurate as a reference value based on an anatomical average value. Because it is expensive. Further, by dispersing the contact points at approximately three points of the left and right Hammer's notches 34 on the rear side and the front incisor gingival lip transition part 32, an auxiliary tool for manufacturing the upper jaw when placed on the upper jaw model 3. 1 is stable, and the virtual occlusal plane p is stably reproduced. In order to reproduce the virtual occlusal plane p with high accuracy, the maxillary first reference value a is preferably 22 mm, and the maxillary second reference value b is preferably 5 mm. In addition, the reference position in the upper jaw model can be set in parts other than the central incisor gingival lip transition portion 32 and the Hammer notch 34.

  Further, in the mandibular production assisting tool 2, the central incisor gingival lip transition portion 42 at the time of the toothed jaw in the lower jaw was set as the first reference position, and the posterior triangles 44 on both the left and right sides were set as the second reference position. The reason why the reference position is the central incisor gingival lip transition part 42 and the posterior triangle 44 is that the distance (height) from these reference positions to the virtual occlusal plane p is accurate as a reference value based on an anatomical average value. Because it is expensive. Further, by dispersing the contact points at approximately three points of the rear left and right posterior posterior triangles 44 and the front middle incisor gingival lip transition portion 42, a mandibular production assisting tool when placed on the lower jaw model 4. 2 is stable, and the virtual occlusal plane p is stably reproduced. In order to reproduce the virtual occlusal plane p with high accuracy, the first reference value c for the lower jaw is preferably 18 mm. Further, the second reference value d for the lower jaw varies depending on which position of the post-mortar triangle 44 the second member 202 is brought into contact with. As shown in FIG. 3, the height of the posterior triangle 44 is H, and a point on the posterior triangle 44 whose height from the lowest point H1 of the posterior triangle 44 is 1 / 2H (half of H) is Let H2 be a point on the posterior triangle 44 where the height from the lowest point H1 of the posterior triangle 44 is 2 / 3H. At this time, when the second member 202 is brought into contact between H2 and H3, the lower reference value d for the lower jaw is preferably set to 1.5 mm. In the present embodiment, the lower reference value d for the lower jaw is set as the thickness of the second member 202. When the lower reference value d for the lower jaw is 1.5 mm, the most versatile contact point of the second member 202 is H2 (a point having a height of 1/2). Therefore, it is usually preferable that the contact point of the second member 202 is H2. The position where the contact point of the second member 202 is set can be appropriately adjusted depending on the patient. In addition, the reference position in the lower jaw model can be set in parts other than the central incisor gingival lip transition part 42 and the posterior triangle 44.

  The positional relationship between the maxillary central incisor gingival lip transition portion 32 and the Hammer notch 34 is slightly different depending on the patient. In addition, the left and right Hammer notches are not necessarily located symmetrically, and are rather asymmetric in many cases. In this regard, in the upper jaw production assisting tool 1, the upper jaw rear abutting portion 12 is movable in the front-rear direction with respect to the upper jaw front abutting portion 11, and the upper jaw rear abutting portion 12 is a surface of the flat surface h. Since it is attached so as to be rotatable inward, the positional relationship between the front contact portion and the rear contact portion can be made to correspond to each patient. Therefore, it is regarded as a highly versatile production aid.

  The same applies to the lower jaw. The positional relationship between the lower incisor gingival lip transition portion 42 and the posterior triangle 44 (H2 or H3) differs slightly depending on the patient. In addition, the left and right posterior triangles 44 are not necessarily located symmetrically, but rather are often left-right asymmetric. However, in the lower jaw production assisting tool 2, the lower jaw rear contact portion 22 is attached to the lower jaw front contact portion 21 so as to be rotatable in the in-plane direction of the plane portion h. The positional relationship with the rear contact portion can be made to correspond to each patient. Therefore, it is regarded as a highly versatile production aid.

  In the upper jaw production assisting tool 1, the upper jaw front abutting portion 11 may be brought into contact with both the left and right two central incisor gingival lip transition portions 32 as described above. You may make it contact | abut with only one of the lip transition parts 32. FIG. That is, the left projecting end 11a of the left and right projecting ends 11a in the upper jaw front abutting portion 11 of the upper jaw production assisting tool 1 is replaced with the right middle cut of the left and right central incisors and gingival lip transition portions 32. It is possible to contact the gingival lip transition part 32, or conversely, the right protruding end 11 a can be contacted to the left central incisor gingival lip transition part 32. Even if there is only one point of contact in the upper jaw front contact portion 11, the upper jaw manufacturing aid 1 is in contact with the other two left and right Hammer's notches 34 and is stably supported at three points. Thus, the protruding end 11a of the upper jaw front contact portion 11 may be one instead of two as in the upper jaw production assisting tool 1 described above.

  Similarly, in the production assisting tool 2 for the lower jaw, the front abutting portion 21 for the lower jaw may be brought into contact with both the left and right middle incisor gingival lip transition portions 42 as described above. You may make it contact | abut only with one of the incisor gingival transition parts 42. FIG. That is, the left projecting end 21a of the left and right projecting ends 21a of the mandibular front abutting portion 21 of the mandibular production assisting tool 2 is connected to the right side of the left and right middle incisor gingival lip transition portions 42. It is possible to contact the intermediate incisor gingival lip transition portion 42, or conversely, the right protruding end 21 a can be in contact with the left central incisor gingival lip transition portion 42. Even if there is only one point of contact in the lower jaw front contact portion 21, the lower jaw manufacturing aid 2 is in contact with the other two left and right posterior triangles 44 and is stably supported at three points. Thus, the protruding end 21a of the lower jaw front abutting portion 21 may be one instead of two as in the lower jaw manufacturing aid 2.

  In the upper jaw production assisting tool 1 and the lower jaw production assistance tool 2, the portions in contact with the models 3, 4 are shaped so as to substantially make point contact with the models 3, 4. That is, the protruding end 11a and the protruding edge portion 12a of the upper jaw production assisting tool 1 are pointed. Similarly, the protruding end 21a of the mandibular production assisting tool 2 is also pointed. Further, the second member 202 of the mandibular production assisting tool 2 does not have a pointed portion, but the second member 202 is made of a plate-like member. Therefore, the laterally outer edge 202b has a corner, and this corner is Point contact is substantially made with the posterior triangle 44 which is a convex surface. As described above, the upper jaw production assisting tool 1 and the lower jaw production assistance tool 2 are placed in a substantially point contact state with respect to the reference position on the model. Reflected in the part h, the reproduction accuracy of the virtual occlusal plane p is improved.

  In addition, it is not a human body but the model which consists of hard materials, such as gypsum, that the production assistance tool 1 for upper jaws and the production assistance tool 2 for lower jaws are mounted. Therefore, sharp parts such as the projecting end 11a and the protruding edge 12a are not pierced and the production aids 1 and 2 do not sink. This point also contributes to improving the reproduction accuracy of the virtual occlusal plane p.

  The upper jaw production auxiliary tool 1 and the lower jaw production auxiliary tool 2 can be used not only as a complete denture model but also as a production aid for a partial denture model when there are residual teeth. If the remaining teeth interfere with the placement of the upper jaw production assisting tool 1 or the lower jaw manufacturing assistance tool 2, the shape should be adjusted according to the position and number of the remaining teeth so as not to interfere with the remaining teeth. . Further, as described above, the left projecting end of the left and right projecting ends of the upper jaw front contact portion 11 and the lower jaw front contact portion 21 is brought into contact with the right middle incisor gingival lip transition portion. Alternatively, by placing the right protruding end in contact with the left central incisor gingival lip transition portion, it is possible to avoid the remaining tooth and place it on the model.

  FIG. 9 is a diagram illustrating an example of the base surface determination assisting tool 6 for forming the model base surface k parallel to the virtual occlusal plane p formed by the plane part h of the production assisting tools 1 and 2. The basal plane determination assisting tool 6 includes a main body portion 6h including a first flat plate portion 61 and a second flat plate portion 62 that are orthogonal to each other, and a separate portion 63 that has a flat plate shape and is separate from the main body portion 6h. And have.

The separate body portion 63 has a surface contact portion 63b that makes surface contact with the second flat plate portion 62 of the main body portion 6h, and an extending portion 63c that extends in a direction perpendicular to the surface contact portion 63b. . The extending portion 63c is attached to one end (lower end) of the surface contact portion 63b. The bottom surface of the extending portion 63 c is parallel to the top surface of the first flat plate portion 61.
The second flat plate portion 62 has a through hole 62a, while the surface contact portion 63b of the separate body portion 63 has a long hole 63a. And the 2nd flat plate part 62 and the separate part 63 of the main-body part 6h are connected by the connection member 65 which consists of a volt | bolt and a wing nut while penetrating the through-hole 62a and the elongate hole 63a. The second flat plate portion 62 and the surface contact portion 63b are in surface contact with each other and can be moved relative to each other in the extending direction of the elongated hole 63a. Therefore, the base surface determination assisting tool 6 changes the relative length relationship between the second flat plate portion 62 and the surface contact portion 63b, thereby extending the length L in the direction orthogonal to the first flat plate portion 61 (FIG. 9). (See (c)) is variable. The surface contact portion 63b of the separate part 63 is provided with a scale g (see FIG. 9B), and the extension length L can be grasped by reading the scale g. Furthermore, the surface contact portion 63b and the second flat plate portion 62 can be oriented in the vertical direction by bringing the bottom surface of the extended portion 63c into surface contact with the upper surface of a work table or the like. In addition, the protrusion edge part 63d which protrudes in the 2nd flat plate part 62 side is provided in the right-and-left both-sides edge part of the surface contact part 63b. The interval between the left and right protruding edge portions 63 d is substantially equal to the width in the left-right direction of the second flat plate portion 62. The second flat plate portion 62 slides in a groove having a substantially U-shaped cross section formed by the left and right protruding edge portions 63d and the surface contact portion 63b.

  The base surface determination assisting tool 6 is used to form the model base surface k parallel to the virtual occlusal plane p when the above-described model base portion md is formed. Specifically, it can be used as follows. First, the production assisting tool is placed at a predetermined position of the above-described initial plaster-type impression surface 31, and the virtual occlusal plane p is reproduced by the plane portion h of the production assisting tool. Then, place the initial plaster mold with the additional plaster on the lower side and the production aid placed on the upper side on a reference plane (for example, the upper surface of a desk), and so as to overlap the plane portion h. The first flat plate portion 61 of the basal plane determining aid 6 is applied to the portion h. If the second flat plate portion 62 and the surface contact portion 63b are perpendicular to the reference plane, and the first flat plate portion 61 and the flat surface portion h are in surface contact with no gap, the flat portion h and the reference plane are parallel. It turns out that. Therefore, the basal plane determination assisting tool 6 can confirm the parallelism between the plane portion h and the reference plane. By bringing the bottom surface of the extending portion 63c into surface contact with the reference plane, the second flat plate portion 62 and the surface contact portion 63b are in a state perpendicular to the reference plane. In this way, the additional plaster is deformed while confirming the parallelism between the plane portion h and the reference plane by the base surface determination assisting tool 6. By applying the first flat plate portion 61 to a plurality of locations on the plane portion h, the accuracy of confirming the parallelism between the plane portion h and the reference plane is further increased. When the plane portion h and the reference plane are parallel, the gypsum is cured while maintaining the state. Then, the shape of the reference plane is transferred to the additional plaster, and a model base surface k parallel to the plane portion h is formed. Moreover, it is possible to work while confirming the distance between the reference plane and the plane portion h by the scale g described above.

It is a side view of the state which mounted the manufacturing assistance tool for upper jaws which is embodiment of this invention on the upper jaw model. It is the top view which looked at the state of FIG. 1 from the top. It is a side view of the state which mounted the manufacturing aid for the lower jaw which is embodiment of this invention on the lower jaw model. It is the top view which looked at the state of FIG. 3 from the top. It is a side view which shows a mode that the state of the oral cavity of a human body was reproduced combining the upper jaw model and the lower jaw model. It is a figure of the production assistance tool for upper jaws which is embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the 2nd member in the production assistance tool for upper jaws of FIG. 6, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure of the manufacturing aid for the lower jaw which is embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows a basal plane determination auxiliary tool, (a) is a top view, (b) is a front view, (c) is a side view.

Explanation of symbols

1 Production aid for upper jaw (Production aid)
11 Front contact part for upper jaw (front contact part)
12 Maxillary rear abutment (rear abutment)
13 Base part for upper jaw (base part)
102 2nd member (member attached so that it can move to the front-back direction with respect to a base | substrate part, and can rotate in the surface direction of a plane part)
2 Mandibular production aid 21 Mandibular front abutment (front abutment)
22 Mandibular rear abutment (rear abutment)
23 Mandibular base part (base part)
202 Second member (rotating member)
3 Upper jaw model (model)
32 Middle incisor gingival lip transition part in the maxilla with toothed jaw 34 Hammerer notch 4 Mandibular model 42 Middle incisor gingival lip transition part in the mandible in mandible 44 Postmolar triangle p Virtual occlusal plane a First upper jaw Reference value (first reference value)
b Upper jaw second reference value (second reference value)
c First reference value for lower jaw (first reference value)
d Second reference value for lower jaw (second reference value)

Claims (5)

A front abutting portion capable of abutting on a first reference position located on the front side of a model of an upper jaw or a lower jaw obtained based on obtaining an impression in the oral cavity;
A rear abutting portion capable of abutting on a second reference position located on the left side and the rear side of the first reference position in a state where the front abutting portion is in contact with the first reference position;
While connecting the front contact portion and the rear contact portion, and comprising a base portion having a flat portion on one surface,
The protrusion length of the front contact portion from the flat surface portion is set to a predetermined first reference value, and the protrusion length of the rear contact portion from the flat surface portion is set to a predetermined second reference value. An auxiliary tool for the production of denture models. The model is a maxillary model obtained based on taking an impression in the maxillary oral cavity,
The first reference position is a middle incisor gingival lip transition portion at the time of edentulous jaw in the upper jaw,
The denture model manufacturing aid according to claim 1, wherein the second reference position is a Hammer notch located on both the left and right sides. The front abutting portion protrudes in a bifurcated manner from the front edge portion of the base portion,
The said back contact part is provided in the member attached so that it was movable to the front-back direction with respect to the said base | substrate part, and was able to rotate in the surface direction of the said plane part. A tool for making the denture model as described. The model is a lower jaw model obtained on the basis of impression taking in the lower jaw oral cavity,
The first reference position is a central incisor gingival lip transition portion at the time of dentition in the lower jaw,
The denture model manufacturing aid according to claim 1, wherein the second reference position is a posterior triangle on both the left and right sides. The front abutting portion protrudes in a bifurcated manner from the front edge portion of the base portion,
Each of the left and right sides of the rear edge of the base portion protrudes from the left and right sides of the rear edge of the base portion toward the outside of the base portion and is rotatable in the in-plane direction of the flat portion. 5. A tool for manufacturing a denture model according to claim 4, wherein a rotating member is provided, and the rear abutting portion is provided on the rotating member.

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