tooth model

Abstract

To provide a training tooth model that enables efficient training in abutment tooth formation. [Solution] The practice tooth model 20A is a model tooth used for practicing the formation of an abutment tooth, and comprises a crown portion 21 and a root portion 22 connected to the crown portion 21. The crown portion 21 has a practice portion 210 where the crown portion 21 is not cut, and a hand portion 211 where a portion of the crown portion 21 is cut to serve as a model for the abutment tooth. The practice tooth model 20A allows the practice portion 210 and the hand portion 211 to be located within the same field of view of the user, so the target hand portion 211 can be constantly confirmed while cutting the practice portion 210, and any misalignment can be immediately noticed.

Description

[Technical Field]

[0001] The present invention relates to a tooth model. [Background technology]

[0002] One type of tooth grinding treatment involves forming abutment teeth, which serve as the base for prosthetics such as crowns and bridges. Abutment tooth preparation requires the skill to establish a three-dimensional image and then operate a dental handpiece to cut toward that goal, making it quite difficult for inexperienced dentists and students. Dentists and students acquire these skills through repeated practice, much like an artistic sculptor, by grinding down teeth.

[0003] Tooth models are widely used in training for forming abutment teeth. For example, Patent Document 1 describes a dental model that includes a tooth model base with multiple insertion holes and multiple tooth models detachably inserted into the insertion holes. Dentists, students, and others can use the tooth models to practice in a way that closely resembles actual treatment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7575746 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, training in abutment tooth preparation is performed on unprepared model teeth while referring to a completed model of the abutment tooth or a photograph of a model abutment tooth. However, with this training method, the completed model, photograph, etc. and the actual model tooth are sometimes not within the same field of view of the dentist, student, etc. This poses a problem in that it is difficult for the dentist, etc. to notice any discrepancy between the shape cut by themselves and the ideal shape.

[0006] Therefore, an object of the present invention is to provide a training tooth model for improving the efficiency of abutment tooth formation training. [Means for solving the problem]

[0007] The tooth model according to this invention is A model tooth for practicing abutment tooth preparation, A crown portion of the tooth; a root portion connected to the crown portion, The crown portion is a training portion in which the crown portion is not cut; a dental crown portion cut to serve as a model for an abutment tooth; It has. [Effects of the Invention]

[0008] According to this invention, the hand position and practice area can be placed within the same field of vision of the user, so the target hand position can be constantly checked while cutting the practice area, and any deviations can be immediately noticed. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of a schematic configuration of a dental model according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view showing an example of the configuration of a tooth model when viewed from the lip side according to the present embodiment. [Figure 3] FIG. 1 is a perspective view showing an example of the configuration of a tooth model when viewed from the palate side according to the present embodiment. [Figure 4] FIG. 1 is a side view showing an example of the configuration of a tooth model having a practice portion and a hand portion according to this embodiment. [Figure 5] FIG. 1 is a front view showing an example of the configuration of a tooth model having a practice portion and a hand portion according to the present embodiment. [Figure 6] FIG. 10 is a perspective view showing an example of the configuration of a tooth model as viewed from the lip side according to a first modified example. [Figure 7] FIG. 11 is a perspective view showing an example of the configuration of a tooth model according to a second modified example, as viewed from the labial side. [Figure 8] FIG. 11 is a perspective view showing an example of the configuration of a tooth model as viewed from the palate side according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] A training tooth model according to a preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the drawings may contain parts with different dimensional relationships and ratios.

[0011] [Example of dental model 1 configuration] Fig. 1 is a diagram showing an example of the schematic configuration of a dental model 1 according to this embodiment. For convenience, Fig. 1 shows only the maxillary dental model 1, but the mandibular dental model also has a similar configuration to the maxillary dental model 1. Fig. 1 also shows the maxillary dental model 1 inverted upside down and placed on a work table. In this embodiment, the inside of the mouth of the dental model 1 is the palate side, and the side opposite the palate side of the dental model 1 is the lip side.

[0012] The dental model 1 includes a tooth model base 10 and a plurality of tooth model pieces 20A. The tooth model base 10 has a base portion 11 and a gum portion 12. The base portion 11 supports the gum portion 12 and the tooth model pieces 20A, and has a flat bottom surface so that the dental model 1 can be placed on a work surface such as a desk or table. The gum portion 12 supports the tooth model pieces 20A arranged in a generally arched (U-shaped) configuration and protrudes in a mountain-like shape toward the lower jaw. Insertion holes 13 are formed at the top of the gum portion 12 at positions corresponding to each tooth model 20A, allowing the tooth model 20A to be attached and detached. For example, if the tooth model 20A consists of 14 teeth, including incisors, canines, and molars, as described below, an insertion hole 13 is formed at each position corresponding to each tooth model 20A.

[0013] [Example of tooth model 20A] The tooth model 20A is made up of 14 model teeth, including incisors, canines, and molars. If wisdom teeth are included, the tooth model 20A may be made up of 16 teeth. The tooth model 20A is detachably attached to the corresponding insertion hole 13 in the gum portion 12. The following describes the structure of the tooth model 20A corresponding to the central incisor, a front tooth, among the multiple tooth model 20A provided in the upper jaw, but the same structure as the tooth model 20A can also be applied to other tooth model such as canines and molars.

[0014] Fig. 2 is a perspective view showing an example of the configuration of a tooth model 20A according to this embodiment when viewed from the lip side. Fig. 3 is a perspective view showing an example of the configuration of a tooth model 20A according to this embodiment when viewed from the palate side.

[0015] The model tooth 20A has a crown portion 21 and a root portion 22 connected to the crown portion 21. As shown in FIG. 1 , the crown portion 21 is the portion exposed from the gum portion 12 when the model tooth 20A is attached to the insertion hole 13 of the model tooth table 10. The root portion 22 is the portion covered and embedded by the gum portion 12 when the model tooth 20A is attached to the insertion hole 13 of the model tooth table 10. In this embodiment, the model tooth 20A is basically fixed to the model tooth table 10 by fitting the outer shape of the root portion 22 into the insertion hole 13. However, if the holding power of the fitting is insufficient, the model tooth 20A may be fixed by fastening a screw (not shown) from the bottom side of the base portion 11 into a screw hole formed in the root portion 22. This fixes the multiple model teeth 20A at corresponding positions in the gum portion 12.

[0016] The crown portion 21 includes a training portion 210 that mimics the shape of the crown before cutting, and a hand portion 211 that represents the shape of the prepared abutment tooth. By arranging these components side by side within a single tooth model, the user can practice preparing an abutment tooth with the training portion 210, which serves as the practice target, and the hand portion 211, which serves as the reference, in the same field of view. The training portion 210 mimics the shape of the crown of a natural tooth and has a flattened outer shape with a single-mountain-like side profile. Specifically, it includes a first labial axial surface 210a located on the labial side, a first palatal lateral surface 210b located on the palatal side, a first incisal end portion 210c located on the tip side, a first proximal surface 210d located on the lateral side, a first cervical portion 210e, and a first palatal axial surface 210f. The user can master the abutment tooth preparation technique by sequentially cutting the training portion 210 using a dental handpiece or the like. The names of each component surface will be explained in the following paragraphs.

[0017] The explanation given in this document shall apply.

[0017] The hand portion 211 is a portion that three-dimensionally represents the final shape of the model abutment tooth and functions as a reference when the user forms the practice portion 210. The hand portion 211 is formed, for example, by cutting the crown portion 21 while adjusting a predetermined cutting amount, taper angle, etc., and is processed into an abutment tooth shape that is one size smaller than the outer shape of the practice portion 210. Specifically, the hand portion 211 has a second labial axial surface 211a located on the labial side, a second palatal lateral surface 211b located on the palatal side, a second incisal end portion 211c located on the tip side, a second proximal surface 211d located on the lateral side, a second palatal axial surface 211f located on the palatal cervical portion, and a margin portion 211e corresponding to the first cervical portion 210e of the practice portion 210. Note that in this specification, the second labial axial surface 211a is referred to as the "labial axial surface" in the anterior tooth portion and as the "buccal axial surface" in the molar portion. The second palatal side surface 211b corresponds to the "palatal side surface" in the maxillary anterior teeth, the "lingual side surface" in the mandibular anterior teeth, and the "occlusal surface" in the molar region, and the second palatal axial surface 211f is called the "palatal axial surface" in the maxilla and the "lingual axial surface" in the mandible. The second incisal edge 211c is a component provided only in the anterior teeth region and does not exist in the molar region.

[0018] In this embodiment, when the center of the left-right direction of the front of the crown portion 21 of the model tooth 20A when viewed from the palate side is used as a reference, the practice portion 210 is formed in the left half of the crown portion 21, and the hand portion 211 is formed in the right half of the crown portion 21. That is, in the model tooth 20A of this embodiment, half of the crown portion 21 is composed of the practice portion 210, and half of the crown portion 21 is composed of the hand portion 211. This allows the practice portion 210 and the hand portion 211 to be placed within the same field of view of the user. Note that the positions of the practice portion 210 and the hand portion 211 are not limited to those shown in FIG. 2 . For example, the practice portion 210 may be formed in the right half of the crown portion 21, and the hand portion 211 may be formed in the left half of the crown portion 21. In the example described above, the crown portion 21 is divided into left and right portions based on the center line when viewed from the labial side, but this configuration is not limited to this. The crown portion may be divided into a lip side and a palate side, and the practice portion 210 and the hand portion 211 may be formed on each side.

[0019] Next, an example of the specific processed size, shape, etc. of the hand portion 211 will be described. Fig. 4 is a side view showing an example of the configuration of a model tooth 20A having the practice portion 210 and the hand portion 211 according to this embodiment. Fig. 5 is a front view showing an example of the configuration of a model tooth 20A having the practice portion 210 and the hand portion 211 according to this embodiment. In Fig. 5, the imaginary outline of the practice portion 210 after cutting is shown by a thin two-dot chain line, and the thick two-dot chain line of the hand portion 211 shows the outline of the original tooth crown shape that serves as a forming reference.

[0020] The second lip-side axial surface 211a of the hand portion 211 is formed by removing a thickness W1 of 1.3 mm to 1.5 mm from the first lip-side axial surface 210a of the training portion 210. The second palatal side surface 211b and the second palatal side axial surface 211f of the hand portion 211 are formed by removing a thickness W2 of 0.8 mm to 1.0 mm from the first palatal side surface 210b and the first palatal side axial surface 210f of the training portion 210. The second cutting edge portion 211c of the hand portion 211 is formed by removing a thickness W3 of 2.0 mm to 2.5 mm from the first cutting edge portion 210c of the training portion 210.

[0021] The margin portion 211e of the hand portion 211 is formed by removing a thickness W4 of approximately 1 mm from the first cervical portion 210e of the training portion 210. The second proximal surface 211d of the hand portion 211 is formed by removing a thickness W5 of approximately 1.0 mm to 2.0 mm from the first proximal surface 211d' of the original crown shape. The margin portion 211e extending from the labial side to the palatal side of the hand portion 211 is formed in the shape of a heavy chamfer or chamfer. The inclined line L1 is set along the surface located on the cervical side of the second labial axial surface 211a formed by removing the thickness W1 from the first labial axial surface 210a.

[0022] On the other hand, the inclined line L2 based on the second palatal-side axial surface 211f formed on the palate side is formed so that the angle it forms with the inclined line L1, i.e., the taper angle, is approximately 12° to 20°. Regarding the inclined line L3 based on the second proximal surface 211d of the hand part 211, assuming that the training part 210 will be cut symmetrically later, it is formed so that the angle it forms with the virtual symmetric plane, i.e., the taper angle of the mesio-distal axial surface, is 12° to 20°.

[0023] [Design Significance] According to this embodiment, by configuring a single tooth model 20A with a practice area 210 on the left half and a hand area 211 on the right half, the user can simultaneously check the practice target and the target morphology within the same field of view. This configuration allows the user to immediately notice any discrepancies between the practice area and the target model morphology while cutting the practice area and make appropriate corrections on the spot. Furthermore, the entire process of cultivating precision and a sense of spatial balance while mentally constructing the overall image of the abutment tooth can be completed with a single tooth model.

[0024] [Introduction of the training method, training procedure using the first tooth model] Next, an example of a method for practicing the formation of an abutment tooth using the model tooth 20A according to this embodiment will be described. Using the first model tooth 20A, which has a practice portion 210 formed on the left half of the crown portion and a hand portion 211 formed on the right half, the user cuts the left practice portion 210 using a dental handpiece. The procedure involves first cutting the first cutting edge 210c to a thickness of W3, aiming for the height of the corresponding second cutting edge 211c of the hand portion 211. Next, the first labial axial surface 210a on the labial side is cut to a thickness of W1, shaping it so that it is flush with the second labial axial surface 211a of the hand portion 211. Furthermore, the first palatal side surface 210b and the first palatal axial surface 210f on the palatal side are cut to a thickness of W2, respectively, to match the second palatal side surface 211b and the second palatal axial surface 211f of the hand portion 211. Furthermore, the first proximal surface 210d is cut from the labial side toward the palatal side (210a → 210b) while maintaining the thickness W5 from the first cervical portion 210e to the first incisal end 210c. The labial cutting surface 210a', the mesial proximal surface 210d', and the palatal cutting surface 210f' are each formed to join with adjacent surfaces with smooth curves, forming a continuous and integrated axial surface. The transition curves between these surfaces are adjusted with reference to the curved shapes at the junctions of the second labial axial surface 211a, the second proximal surface 211d, and the second palatal axial surface 211f of the hand portion 211, thereby imitating a consistent three-dimensional form as an abutment tooth. Furthermore, a taper angle (12 to 20°) is formed between the labial cutting surface 210a' and the lingual cutting surface 210f', and between the mesial proximal surface 210d' and the second proximal surface 211d of the hand part 211, respectively, resulting in a formation form suitable for the prosthesis. In this way, since the hand part 211 is always present within the same field of view, the user can proceed with training while receiving visual feedback of the formation process as it progresses.

[0025] [Training procedure using the second tooth model] Next, using the second tooth model 20A, which has a practice area 210 on the right half and a hand area 211 on the left half, cutting training on the right side is performed using the same procedure. The cutting procedure is the same as in the previous section, and by cutting using the hand area as a reference, the basic structure of abutment tooth formation is learned.

[0026] [Structure and significance of alternating training] The first tooth model 20A and the second tooth model 20A are based on the same central incisor and are configured to have half the shape of each side. The user can alternate between these and repeat the shaping training for each side. This makes it easier to understand the symmetry of the shaping target and allows the user to master balanced shaping techniques while visualizing the final shape in space.

[0027] In recent years, advanced teaching materials such as VR have also appeared, but due to the cost of dedicated equipment and the burden of operation, their adoption in general training sites has not progressed. In contrast, according to this embodiment, a tooth model 20A with a hand part 211 can be created using a conventional tooth model, which is less costly and less burdensome than advanced teaching materials such as VR. Therefore, it can be easily and immediately introduced into existing training sites.

[0028] <First Modification> In the tooth model 20B according to the first modification of this embodiment, the hand portion 211 of the crown portion 21 of the tooth model 20A is painted in a color different from that of the practice portion 210. The following description will focus on differences from the above embodiment, and components that are substantially the same as those in the above embodiment may be given the same reference numerals. Furthermore, descriptions of components that are substantially the same as those in the above embodiment will be omitted or simplified.

[0029] FIG. 6 is a perspective view showing an example of the configuration of a tooth model 20B according to the first modification, as viewed from the labial side. The hand portion 211 of the crown portion 21 is painted in a color different from that of the practice portion 210. The painting may be applied to the entire hand portion 211 or a portion thereof. An example of the color is black. This coats the surface of the hand portion 211 with a colored layer of a predetermined thickness. The user can practice feather touch by thinly scraping away only this colored layer. Feather touch is a technique in which a cutting bur attached to a dental handpiece is brought into contact with the target surface with very light force. This technique is essential for delicate shaping while preventing overcutting. In particular, feather touch technique is required in situations requiring careful and precise cutting operations, such as finishing the preparation of abutment teeth, forming margins close to the gingiva, and shaping operations while avoiding interference with adjacent teeth. In addition, feather touch techniques are also required in dental treatments requiring careful and precise cutting operations, such as caries removal close to the dental pulp. In the above example, the case where the hand part 211 is painted in a predetermined color is described, but this is not limited to this, and for example, a colored film, thin film, etc. may be attached to the hand part 211.

[0030] <Second Modification> In a tooth model 20C according to a second modification of this embodiment, the proximal portion 211 of the crown 21 is configured to be 1 / 4 the size of the entire tooth. The following description will focus on differences from the above embodiment, and components that are substantially the same as those in the above embodiment may be given the same reference numerals. Furthermore, descriptions of components that are substantially the same as those in the above embodiment will be omitted or simplified.

[0031] [Example of tooth model 20C] Fig. 7 is a perspective view showing an example of the configuration of a tooth model 20C according to the second modified example, as viewed from the lip side. Fig. 8 is a perspective view showing an example of the configuration of a tooth model 20C according to the second modified example, as viewed from the palate side. The following description will be given representatively of a tooth model 20C corresponding to a central incisor of the maxilla.

[0032] The hand portion 211 of the model tooth 20C of the second modified example is configured to be half the size of the hand portion 211 of the model tooth 20A shown in Figures 2 and 3, etc. In other words, the model tooth 20C of the second modified example is configured with approximately three-quarters of the crown portion 21 as the practice portion 210, and the remaining one-quarter as the hand portion 211. Specifically, the practice portion 210 is configured from the left half of the crown portion 21 and the palatal half of the right half of the crown portion 21, and the hand portion 211 is configured from the lip half of the right half of the crown portion 21.

[0033] The position of the hand portion 211 is not limited to the configuration shown in Figures 7 and 8. For example, the hand portion 211 may be configured in the palate-side half of the right half of the crown portion 21, or in the lip-side half of the left half of the crown portion 21, or in the palate-side half of the left half of the crown portion 21. The area of ​​the crown portion 21 occupied by the hand portion 211 can be flexibly changed depending on the skill and training level of the user. For example, the hand portion 211 may be configured to occupy 1 / 3 or 1 / 5 of the crown portion 21.

[0034] While the preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. Furthermore, various modifications and improvements made by those skilled in the art naturally fall within the technical scope of the present disclosure, provided that they fall within the scope of the technical ideas described in the claims of utility model registrations.

[0035] For example, the practice section 210 may be configured with a two-layer structure consisting of a first section having a model shape of the abutment tooth after cutting, and a second section that covers the entire first section and has the shape before cutting. In this case, by coloring the first section a different color from the second section, when the surface of the first section is exposed by cutting the second section, the user can confirm that the practice section 210 has been cut into the model abutment tooth. [Explanation of symbols]

[0036] 1 Dental model 10 Dental model 11 Base 12 Gingiva 13 Insertion hole 20A, 20B, 20C tooth models 21 Crown part 210 Practice Club 211 Hand Headquarters 22 Root

Claims

1. A model tooth for practicing abutment tooth preparation, A crown portion of the tooth; a root portion connected to the crown portion, The crown portion is a training portion in which the crown portion is not cut; a dental crown portion cut to serve as a model for an abutment tooth; A tooth model having the following features:

2. the practice portion is formed on one side of the center in the left-right direction of the front surface of the crown portion, The hand part is formed on the other side of the center. The tooth model according to claim 1 .

3. The surface of the hand part is colored a different color from the surface of the practice part. The tooth model according to claim 1 .

4. A jaw-shaped dental model having a gum part formed in a substantially U-shape, the dental model being detachably attached to an insertion hole formed in the gum part of the dental model. The tooth model according to claim 1 .

Images