Dental technician working model and dowel pins used therefor

Abstract

To provide a dental technique work model capable of minimizing materials of a dowel pin, shortening its machining time and suppressing a machining cost.SOLUTION: A dental technique work model comprises: a fixing plate 6 to which a dental model 4 is fixed; a plurality of dowel pins 8 implanted in the fixing plate 6; and a support base 10 for supporting the fixing plate 6. A plurality of insertion holes 18 are provided on an upper surface of the support base 10, and an insertion-side opening of each insertion hole 18 is formed into a conical shape whose inner diameter gradually decreases toward a tip end side. Each dowel pin 8 includes: a pin body 38 supported by the insertion hole 18; a tip-side portion 40 extending from the pin body 38 to a tip side; and a base-end side 42 extending from the pin body 38 to a base end side. The pin body 38 of the dowel pin 8 is formed into a conical shape whose outer diameter gradually decreases toward the tip side, corresponding to the insertion-side opening of the insertion hole 18, where the pin body 38 is supported by the insertion opening of the insertion hole 18.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a dental laboratory working model used in dental treatment and the dowel pins used therefor.

Background Art

[0002] Generally, a dental laboratory working model used in dental treatment and the like includes a fixing plate to which a tooth-shaped model is fixed, a plurality of dowel pins implanted in the fixing plate, and a support base for supporting the fixing plate. The tooth-shaped model is fixed to the upper surface of the fixing plate (see, for example, FIG. 5 of Patent Document 1). The support base is formed of a synthetic resin, and a plurality of insertion holes for inserting dowel pins are provided on the upper surface thereof, and these insertion holes are arranged at intervals on the support base.

[0003] A first engaging protrusion is provided on one side edge of the upper surface of the support base, and a plurality of first protruding portions and a plurality of first concave portions are alternately provided on the inner side portion of the first engaging protrusion. A second engaging protrusion is provided on the other side edge, and a plurality of second protruding portions and a plurality of second concave portions are provided on the inner side portion of the second engaging protrusion.

[0004] On the other hand, the fixing plate is formed of gypsum, and first and second engaging recesses are provided on both side edges of the lower surface thereof corresponding to the first and second engaging protrusions on the support base side. A plurality of first concave portions and a plurality of first protruding portions are provided on the inner side portion of the first engaging recess corresponding to the plurality of first protruding portions and the plurality of first concave portions on the support base side. A plurality of second concave portions and a plurality of second protruding portions are provided on the inner side portion of the second engaging recess corresponding to the plurality of second protruding portions and the plurality of second concave portions on the support base side.

[0005] In such a dental laboratory working model, when a plurality of dowel pins on the fixing plate side are inserted into a plurality of insertion holes on the support base side and the fixing plate is placed on the support base, the first and second engaging protrusions on the support base side are Fixing plateengaged with the first and second engaging recesses on the side, and a plurality of first and second protruding portions and a plurality of first and second concave portions on the support base side are Fixing plate engaged with the plurality of first and second concave portions and the plurality of first and second protruding portions on the side, whereby the fixing plate can be reliably placed and supported on the support base.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in such a dental laboratory working model, the inner peripheral surface of each insertion hole of the support base is formed in an elongated conical shape with an outer diameter gradually decreasing toward the tip side. Correspondingly, the outer diameter of the pin main body portion of each dowel pin is also formed in an elongated conical shape toward the tip side, and the outer peripheral surface of the dowel pin (pin main body portion) corresponding to the entire area of the inner peripheral surface of this insertion hole is configured to be in contact support. Since it is configured in this way, when the contact length between the insertion hole on the support base side and the dowel pin becomes long, it is necessary to increase the inner diameter of this insertion hole, and as a result, a dowel pin with a thick outer diameter is also used for the dowel pin inserted therein. Therefore, because a thick material is used as the dowel pin, the material cost becomes high. In addition, since the area that needs to be processed with high precision (the area in contact with the insertion hole) becomes long, a long processing time is required for processing this area, and the processing cost also becomes high.

[0008] In such a dental laboratory work model, the base end portion of the dowel pin extends from the base end of the pin main body portion with the same thickness. When forming the work model, the dowel pin is inserted into the insertion hole of the support base, and with the dowel pin inserted in this way, a frame body is attached to the upper part of the support base, and then, plaster is poured into this frame body and the plaster is solidified. After that, the surface is ground so that the dental model is fixed to the fixing plate as desired and is formed into a clean and flat state.

[0009] At this time, in order to make the thickness of the fixing plate uniform, grinding is performed until it abuts on the base end surface of the dowel pin (in other words, the base end surface is exposed). However, when grinding up to this point, a large load of the grinding work is transmitted to the operator's hand, and the work burden on the operator increases.

[0010] An object of the present invention is to provide a dental laboratory work model that can suppress the amount of material of the dowel pin, shorten its processing time, and also suppress the processing cost, and a dowel pin used therefor.

Means for Solving the Problems

[0012] The dental laboratory work model of the present invention is a dental laboratory work model including a fixing plate to which a dental model is fixed, a plurality of dowel pins implanted in the fixing plate, and a support base for supporting the fixing plate, On the upper surface of the support base, a plurality of insertion holes for inserting the plurality of dowel pins are provided, and at least the insertion-side openings of the plurality of insertion holes are in a conical shape with an inner diameter gradually decreasing toward the tip side Formed and, The plurality of dowel pins have a pin main body portion supported by the plurality of insertion holes of the support base, a tip-side portion extending from the pin main body portion toward the tip side, and a base-side portion extending from the Pin body part toward the base end side. The pin main body portions of the plurality of dowel pins are formed in a conical shape with an outer diameter gradually decreasing toward the tip side corresponding to the insertion-side openings of the plurality of insertion holes on the support base side, and the base-side portions of the plurality of dowel pins are embedded in the fixing plate. Inserting the plurality of dowel pins into the plurality of insertion holes and placing the Fixing plate on the support base, the outer peripheral surface of the pin body portion of the plurality of dowel pins is supported by the inner peripheral surface of the insertion-side opening of the plurality of insertion holes on the support base side. In this placed state, the tip-side portions of the plurality of dowel pins are not substantially supported by the inner peripheral surface of the plurality of insertion holes on the support base side.

[0013] Further, the dowel pin of the present invention is a dowel pin inserted and supported in an insertion hole provided in a support base for supporting a fixing plate, of the support base The a pin body portion supported in the insertion hole, a tip-side portion extending from the pin body portion toward the tip side, and the Pin body part having a base-end side portion extending from the base end side and embedded in the fixing plate. The pin body portion is formed in a conical shape with an outer diameter gradually decreasing toward the tip side so as to correspond to the Insertion side opening shape of the insertion hole. In a state where the pin body portion is attached to the insertion-side opening of the insertion hole, the tip-side portion is configured not to be substantially supported by the inner peripheral surface of the insertion hole.

[0014] In such a dental laboratory work model (and dowel pin), it is desirable that the axial length of the pin body portion of the dowel pin be 1.2 to 5.0 mm. By setting the length in this way, it is possible to reduce the outer diameter of the dowel pin, thereby reducing the amount of material used and suppressing the material cost, and shortening the length of the portion that must be processed with high precision.

[0015] Also, in such a dental laboratory work model (and dowel pins), it is preferable to form the end of the base end side portion of the dowel pin into a conical shape, a stepped shape, or a thin cylindrical shape such that the outer diameter of the end face is smaller than that of other parts of the base end side portion. By forming it in this way, the outer diameter of the end face of the base end side portion becomes smaller, and even if the base end side portion of the dowel pin is ground during the grinding operation, the work load is reduced, and the burden on the operator can be decreased.

[0016] Also, in such a dental laboratory work model, a first engaging protrusion protruding upward is provided at a part of at least one side edge on the upper surface of the support base, and a plurality of first protruding portions and a plurality of first concave portions are alternately provided inside the first engaging protrusion. Also, a first engaging recess is provided at a part of at least one side edge on the lower surface of the fixing plate. Further, Fixing plate it is preferable to alternately provide a plurality of first concave portions and a plurality of first protruding portions inside the first engaging recess on the other side. By configuring it in this way, a plurality of dowel pins on the fixing plate side can be inserted into a plurality of insertion holes on the support base side, and the fixing plate can be reliably placed and supported on the upper surface of the support base without looseness.

[0017] Such engaging protrusions (first and second engaging protrusions) may be provided at parts of both side edges on the upper surface of the support base, and such engaging recesses (first and second engaging recesses) may be provided at parts of both side edges on the lower surface of the fixing plate. By configuring it in this way, the fixing plate can be more reliably placed and supported on the upper surface of the support base without looseness.

[0018] In such a dental laboratory work model, a plurality of small protrusions may be provided in the inner region between one side edge and a plurality of insertion holes on the upper surface of the support base, and a plurality of small concave portions may be provided on the lower surface of the fixing plate corresponding to these small protrusions. Even with this configuration, the fixing plate can be reliably placed and supported on the upper surface of the support base without looseness.

Advantages of the Invention

[0020] According to the dental laboratory working model (and dowel pin) of the present invention, the pin body portion of the dowel pin inserted into the insertion hole of the support base is formed in a conical shape with a gradually decreasing outer diameter toward the tip side corresponding to the insertion side opening of the insertion hole on the support base side. Therefore, this pin body portion is Insertion side opening contact-supported by this, and as a result, the axial length of the pin body portion (that is, the conical portion supported by the insertion hole) becomes shorter than in the conventional case. As a result, the length of the portion to be machined with high precision becomes shorter, and it is possible to reduce the machining time and machining costs. Further, since the axial length of the pin body portion becomes shorter, it becomes possible to make the outer diameter of the dowel pin itself thinner, and thereby, it is possible to reduce the material cost by suppressing the amount of material. Further, in a state where the fixing plate is placed on the support base, the tip side portion of the dowel pin is not supported by the inner peripheral surface of the insertion hole on the support base side. Therefore, this dowel pin comes to be supported by the pin body portion, and thereby, the dowel pin can be reliably supported without play.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0023] Hereinafter, with reference to the accompanying drawings, various embodiments of the dental laboratory working model according to the present invention and the dowel pin used therefor will be described.

[0024] First, with reference to FIGS. 1 to 9, the dental laboratory working model of the first embodiment and the dowel pin used therefor will be described. With reference to FIGS. 1 to 4, the illustrated dental laboratory working model 2 includes a fixing plate 6 to which a tooth-shaped model 4 is fixed, a plurality (in this embodiment, five) of dowel pins 8 implanted in the fixing plate 6, and a support base 10 for supporting the fixing plate 6.

[0025] The support base 10 includes a support base body 12, and this support base body 12 is formed of a synthetic resin such as polyethylene resin, polypropylene resin, nylon resin, or urethane resin. This support base body 12 has a horizontally long and cylindrical peripheral side wall 14 and a horizontally long upper wall 16 that covers the upper side of the peripheral side wall 14. Five insertion holes 18 are provided at intervals in the longitudinal direction (the left-right direction in FIGS. 2 and 3) on the upper surface of the upper wall 16 (defining the upper surface of the support base 10).

[0026] In the space 20 formed inside the peripheral side wall 14, cylindrical protrusions 22 extending downward from the lower surface of the upper wall 16 are provided corresponding to the respective insertion holes 18, and each insertion hole 18 is provided penetrating through the inside of the cylindrical protrusion 22 (see FIG. 4). These insertion holes 18 are formed in a conical shape (i.e., a tapered shape with a thinner cross-sectional shape) with the inner diameter gradually decreasing from the upper end to the lower end of the cylindrical protrusion 22. Note that, as will be understood from the later description, it is not necessary for each insertion hole 18 to be conical (cross-sectionally tapered) over its entire length, and only the Insertion side opening (the part that contacts and supports the pin body portion of the dowel pin 8 to be described later) needs to be conical.

[0027] A pair of engaging protrusions, that is, first and second engaging protrusions 24, 26, are provided on both side edges of the upper wall 16 of this support base 10 (support base body 12) facing each other. These engaging protrusions 24, 26 each protrude upward and extend in the longitudinal direction of the upper wall 16. In this embodiment, the first and second engaging protrusions 24, 26 are provided at the intermediate portion in the longitudinal direction of the upper wall 16 and are not provided at both ends thereof. The protruding height of the first and second engaging protrusions 24, 26 from the upper wall 16 is set to about 1.5 mm, for example.

[0028] A plurality of first and second protruding portions 28, 30 are provided at intervals inside the first and second engaging protrusions 24, 26, and first and second concave portions 32, 34 are provided between the plurality of first and second protruding portions 28, 30, respectively (see FIGS. 2 and 3). That is, a first engaging protrusion 24 is provided on one side edge of the upper wall 16, and the first protruding portion 28 and the first concave portion 32 are alternately provided in the longitudinal direction of the first engaging protrusion 24. A second engaging protrusion 26 is provided on the other side edge of the upper wall 16, and the second protruding portion 30 and the second concave portion 34 are alternately provided in the longitudinal direction of the second engaging protrusion 26.

[0029] The first and second protruding portions 28 and 30 are formed with inclined surfaces that slope downward toward the inside, and the first and second concave portions 32 and 34 are also formed with inclined surfaces that slope downward toward the inside. The inclined surfaces of the first and second protruding strips 28 and 30 are formed such that their inclinations are gentler than those of the inclined surfaces of the first and second concave portions 32 and 34. By configuring in this way, the first and second protruding portions 28 and 30 protrude more inward than the first and second concave portions 32 and 34 (see FIGS. 3 and 4).

[0030] Also, positioning protrusions 36 are provided on the outer peripheral surface of the peripheral side wall 14 of the support base 10 (supporting main body 12) corresponding to each insertion hole 18 (in other words, corresponding to the dowel pins 8 of the fixing plate 6). These positioning protrusions 36 are disposed on both sides of the insertion hole 18 sandwiching it.

[0031] The fixing plate 6 placed on the support base 10 is formed of gypsum and has a horizontally long shape corresponding to the shape of the upper wall 16 of the support base main body 12. Dowel pins 8 are implanted in this fixing plate 6 corresponding to each insertion hole 18 of the support base main body 12. As shown in FIG. 5, this dowel pin 8 has a pin main body portion 38, a tip side portion 40 extending from the tip side (lower side in FIG. 5) of this pin main body portion 38, and a base end side portion 42 extending from the base end side (upper side in FIG. 5) of this pin main body portion 38. The base end side portion 42 is implanted in the fixing plate 6 in the manner described later. This dowel pin 8 will be described in detail later.

[0032] Next, regarding the fixing plate 6, on both side edges of the lower surface of this fixing plate 6 (that is, the surface on the side where the dowel pins 8 protrude), corresponding to the first and second engaging protrusions 24 and 26 on the support base 10 (support base main body 12) side, a pair of engaging recesses, that is, the first and second engaging recesses 44 and 46 are provided. The first and second engaging recesses 44 and 46 are each recessed upward and extend in the longitudinal direction of the fixing plate 6.

[0033] On the inner sides of the first and second engaging concave portions 44 and 46, first and second concave portions 48 and 50 are provided corresponding to the first and second protruding portions 28 and 30 on the support base 10 side, and first and second protruding portions 52 and 54 are provided corresponding to the first and second concave portions 32 and 34 on the support base 10 side. That is, on one side edge of the fixing plate 6, a first engaging concave portion 44 is provided corresponding to the first engaging protrusion 24 on the base body 10 side. In this first engaging concave portion 44, first concave portion 48 and first protruding portion 52 are alternately provided corresponding to the first protruding portion 28 and the first concave portion 32 on the base body 10 side. Also, on the other side edge of the fixing plate 6, a second engaging concave portion 46 is provided corresponding to the second engaging protrusion 26 on the base body 10 side. In this second engaging concave portion 46, second concave portion 50 and second protruding portion 54 are alternately provided corresponding to the second protruding portion 30 and the second concave portion 34 on the base body 10 side.

[0034] In this embodiment, the inclined surfaces of the first and second concave portions 50 and 52 are formed corresponding to the inclined surfaces of the first and second protruding portions 28 and 30 on the base body 10 side so that their inclinations become gentle, and the inclined surfaces of the first and second protruding portions 52 and 54 are formed corresponding to the inclined surfaces of the first and second concave portions 32 and 34 on the base body 10 side so that their inclinations become steep.

[0035] On the upper surface of this fixing plate 6, as shown in FIGS. 1, 2, and 4, a tooth-shaped model 4 (a partial type in this embodiment) formed of plaster is fixed. This fixing plate 6 is detachably supported on the upper wall 16 of the support base 10 (support base body 12) by detachably inserting a dowel pin 8 into a corresponding insertion hole 18. In this supported state, the first and second engaging protrusions 24 and 26 of the support base 10 (support base body 12) and the first and second engaging concave portions 44 and 46 on the fixing plate 6 side are detachably engaged, and the first and second protruding portions 28 and 30 on the support base 10 side and the first and second concave portions 48 and 50 on the fixing plate 6 side are detachably engaged, and the first and second concave portions 32 and 34 on the support base 10 side and the first and second protruding portions 52 and 54 on the fixing plate 6 side are detachably engaged (see FIG. 4).

[0036] Next, referring to FIG. 5, the illustrated dowel pin 8 will be described. The pin main body portion 38 of this dowel pin 8 is formed in a conical shape corresponding to the shape of the insertion hole 18 of the support base 10, and its outer diameter gradually decreases toward the tip side. The pin main body portion 38 is inserted and supported in the insertion opening of the insertion hole 18 of the support base 10. Insertion side opening The outer diameter of the pin main body portion 38 is gradually reduced toward the tip side, and the pin main body portion 38 is inserted and supported in the insertion opening of the insertion hole 18 of the support base 10.

[0037] The length of the pin main body portion 38 is set to a length that can stably support the dowel pin 8. The axial length L (FIG. 5) is set in the range of 1.2 to 5.0 mm, and preferably set to 1.5 to 3.5 mm. If this length L is less than 1.2 mm, it becomes difficult to stably support the dowel pin 8. If this length L exceeds 5.0 mm, a material with a large outer diameter is used for the dowel pin 8, and material costs and the like increase.

[0038] When the dowel pin 8 is mounted in the insertion hole 18 of the support base 10, as shown in FIG. 4, the pin main body portion 38 fits into the insertion hole 18 without a gap, and the upper surface (annular upper surface) of the pin main body portion 38 defines the same plane as the upper wall 16 of the support base 10. By configuring in this way, it is possible to prevent gypsum from flowing into the insertion hole 18 during the production of the fixing plate 6. Insertion side opening When the dowel pin 8 is mounted in the insertion hole 18 of the support base 10, as shown in FIG. 4, the pin main body portion 38 fits into the insertion hole 18 without a gap, and the upper surface (annular upper surface) of the pin main body portion 38 defines the same plane as the upper wall 16 of the support base 10. By configuring in this way, it is possible to prevent gypsum from flowing into the insertion hole 18 during the production of the fixing plate 6.

[0039] The tip side portion 40 of the dowel pin 8 extends linearly from the tip side end surface of the pin main body portion 38. Its outer diameter is smaller than the outer diameter of the tip side end surface of the pin main body portion 38, and it is formed in an elongated cylindrical shape. In the mounted state of the dowel pin 8, the tip side portion 40 is not actually in contact and supported by the inner peripheral surface of the insertion hole 18 of the support base 10, and the outer peripheral surface of the pin main body portion 38 is in contact and supported by the inner peripheral surface of the insertion hole 18.

[0040] In this supported state, as shown in FIG. 4, the tip portion of the tip side portion 40 of the dowel pin 8 protrudes downward from the cylindrical protrusion 22 of the support base 10. By protruding it in this way, the protruding portion of the tip side portion 40 is pushed up from below, so that the fixing plate 6 (or a cut part of the fixing plate 6) can be easily removed from the support body 10.

[0041] The base end side portion 42 of this dowel pin 8 extends linearly from the base end side end surface of the pin main body portion 38, and its outer diameter is smaller than the outer diameter of the base end side end surface of the pin main body portion 38. Similar to the tip side portion 40, it is formed in an elongated cylindrical shape. An annular protrusion 62 is provided on this base end side portion 42. By providing the annular protrusion 62 in this way, the dowel pin 8 can be prevented from detaching from the fixing plate 6.

[0042] In this embodiment, further, the tip portion 64 of the base end side portion 42 of the dowel pin 8 is formed in a conical shape in which the outer diameter gradually decreases toward the tip. By forming it in this way, the outer diameter of the tip end surface of this tip portion 64 becomes smaller than that of the other portions of the base end side portion 42, and the area of the tip end surface becomes smaller. By configuring it in this way, the working load during the cutting process when manufacturing the fixing plate (that is, when cutting until the tip end surface of the base end side portion 42 of the dowel pin 8 is exposed) can be kept small, and the working burden on the operator can be reduced.

[0043] Next, with reference to FIGS. 6 to 8, the manufacturing method of the dental laboratory work model 2 described above will be described. When manufacturing this dental laboratory work model 2, plaster is poured into a tooth mold (not shown) to manufacture a tooth form model 4, and the support base 10 (support base body 12) is manufactured by injection molding using synthetic resin. Then, as shown in FIG. 6, the dowel pin 8 is detachably inserted into each insertion hole 18 of the support base body 12 from the tip side (pin insertion step). When inserted in this way, the pin main body portion 38 of the dowel pin 8 is Insertion side opening inserted and supported in the insertion hole 18 of the support base body 12, and its base end side portion 42 protrudes upward from the upper surface of the upper wall 16 by a predetermined length (for example, about 4 mm) (see FIG. 7).

[0044] Thereafter, as shown in FIGS. 6 and 7, a molding base frame 72 is detachably attached to the upper part of the support base body 12 (frame attachment step). Here, the molding base frame 72 used in the frame attachment step will be described. The molding base frame 72 has a generally rectangular outer shape as a whole and is formed of a rubber material such as silicon rubber or synthetic rubber. An opening 74 penetrating vertically is provided inside the molding base frame 72, and this opening 74 has a shape corresponding to the shape of the upper part of the support base body 12.

[0045] When the molding base frame 72 is attached to the upper part of the support base body 12, the upper wall 16 and the upper end portions of the peripheral side walls 14 of the support base body 12 are inserted into the lower end portion of the opening 74, and the inner peripheral surface of the molding base frame 72 comes into close contact with the outer peripheral surface of the peripheral side wall 14. At this time, the lower end portion of the molding base frame 72 is supported by the positioning protrusion 36 of the support base body 12, so that the molding base frame 72 is positioned with respect to the support base body 12. In this attached state, the molding base frame 72 protrudes upward from the upper wall 16 of the support base body 12 by a predetermined height (for example, about 8 mm), and an injection space 76 is defined by the upper surface of the support base body 12 and the inner peripheral surface of the molding base frame 72.

[0046] Thereafter, as shown in FIG. 8, gypsum 78 for molding the fixing plate 6 is injected into the injection space 76 (plate molding step). This gypsum 78 is injected until the proximal end side portion 42 of the dowel pin 8 is completely immersed in the gypsum 78. At this time, since the first and engaging protrusions 24 and 26 are not provided at both ends of the upper wall 16 of the support base body 12, the injected gypsum 78 flows to both ends of the upper wall 16, and the gypsum 78 can be injected almost uniformly over the entire area of the upper wall 16. Then, as the gypsum 78 injected into the injection space 76 hardens, the fixing plate 6 with the dowel pin 8 implanted is molded. At this time, first and second engaging recesses 44 and 46 are formed on the lower surface of the fixing plate 6 corresponding to the first and second engaging protrusions 24 and 26 of the support base body 12, and first and second concave portions 48 and 50 are formed corresponding to the first and second protruding portions 28 and 30 of the support base body 12. At the same time, first and second protruding portions 52 and 54 are formed corresponding to the first and second concave portions 32 and 34 of the support base body 12.

[0047] Thereafter, the molding base frame 72 is removed from the upper part of the support base body 12, and for example, grinding is performed on the upper surface of the fixing plate 6 so that the thickness becomes uniform and flat (processing step). This processing is performed with the fixing plate 6 supported on the upper surface of the support base body 12, and is performed until the proximal end surface of the dowel pin 8 is exposed to the outside.

[0048] In this grinding operation, the gypsum is soft and easy to grind, but the dowel pin 8 is formed of a metal material such as stainless steel and is hard and not easy to grind. When grinding until reaching the end surface of the proximal end side portion 42 of the dowel pin 8, the working load increases rapidly. Therefore, the operator can know that the grinding has been performed until the dowel pin 8 is exposed. In this embodiment, the tip portion 64 of the proximal end side portion 42 of the dowel pin 8 is formed in a conical shape, and the area of its end surface is small. Therefore, even if the end surface of the proximal end side portion 42 of the dowel pin 8 is reached during the grinding operation, a rapid increase in the working load can be suppressed, thereby reducing the working load of the operator.

[0049] After that, the tooth-shaped model 4 is fixed to the upper surface of the fixing plate 6 that has been ground using an adhesive or the like (model fixing step), and in this way, the dental technician's working model 2 shown in FIGS. 1 and 2 can be produced.

[0050] When performing a predetermined operation using this dental technician's working model 2, with the fixing plate 6 supported on the upper surface of the support base body 12, as shown by the dashed line in FIG. 1, for example, a desired part of the tooth-shaped model 4 is cut along the cutting line 80 using a cutting tool (not shown) together with the fixing plate 6 (cutting step). By cutting in this way, the cut part of the tooth-shaped model 4 can be taken out from the remaining part together with the fixing plate 6 and the dowel pin 8. Incidentally, since the positioning protrusions 36 are provided on the support base body 12 corresponding to the respective insertion holes 18, when cutting the tooth-shaped model 4, by using this positioning protrusion 36 as a mark, the location where the dowel pin 8 is disposed can be easily recognized.

[0051] The required operations (for example, production of a dental crown prosthesis, etc.) using this cut tooth-shaped model 4 are performed with the cut fixing plate 6 supported on the upper surface of the support base body 12. In this dental technician's working model 2, as described above, the first and second engaging protrusions 24, 26 on the support base 10 side and the first and second engaging recesses 44, 46 on the fixing plate 6 side are engaged with each other, and the first and second protruding portions 28, 30 on the support base 10 side and the first and second concave portions 48, 50 on the fixing plate 6 side are engaged with each other, and the first and second concave portions 32, 34 on the support base 10 side and the first and second protruding portions 52, 54 on the fixing plate 6 side are engaged with each other. Therefore, the horizontal engagement strength between the fixing plate 6 and the support base body 12 can be increased, and rotation or wobbling of the cut fixing plate 6 with respect to the support base body 12 can be reliably prevented.

[0052] In the first embodiment, in the model fixing step, the tooth-shaped model 4 is fixed to the upper surface of the fixing plate 6 using an adhesive or the like. However, the tooth-shaped model 4 may be pressed against the fixing plate 6 before molding (i.e., the gypsum 78 before curing), and the tooth-shaped model 4 may be fixed to the upper surface of the fixing plate 6 by the curing of the gypsum 78.

[0053] For example, in the above-described embodiment, a pair of engaging protrusions (first and second engaging protrusions 24 and 26) are provided on both side edges of the support base 10 (support base body 12). Correspondingly, a pair of engaging recesses (first and second engaging recesses 44 and 46) are provided on both side edges of the fixing plate 6. However, it is not necessary to always provide such a pair of engaging protrusions and engaging recesses. Either one of them, for example, the first engaging protrusion 24 and the first engaging recess 44 (or the second engaging protrusion 26 and the second engaging recess 46), may be provided.

[0054] For example, when the first engaging protrusion 24 (or the second engaging protrusion 26) is provided on the support base body 12 side and the first engaging recess 44 (or the second engaging recess 46) is provided on the fixing plate 6 side, the first protrusion 28 (or the second protrusion 30) and the first recess 32 (or the second recess 34) provided on the first engaging protrusion 24 (the second engaging protrusion 26) on the support base body 12 side and the first recess 48 (or the second recess 50) and the first protrusion 52 (or the second protrusion 54) provided on the fixing plate 6 side are detachably engaged with each other.

[0055] As the dowel pin, instead of the one in the above-described form, for example, the ones in the forms shown in FIGS. 9(a) to 9(c) can be used. In the following embodiments, the same reference numerals are given to the same members (parts) as those in the above-described embodiment, and the description thereof is omitted.

[0056] In FIG. 9(a) showing the first modified form, in this dowel pin 8A, a plurality (two in this form) of annular protrusions are provided on the proximal end side portion 42A extending from the pin main body portion 38 toward the proximal end side. 62AThey are provided at intervals in the axial direction. Three or more of these annular protrusions 62A may be provided in the axial direction. Instead of these annular protrusions 62A, knurling may be performed.

[0057] In FIG. 9(b) showing the second modified form, in this dowel pin 8B, the tip 64B of the base end side portion 42B extending from the pin body 38 to the base end side is formed in a stepped shape, and the outer diameter of this tip 64B is smaller than that of the other parts of the base end side portion 42B. By machining the tip 64B into a small-diameter portion in this way, the area of the end face of the base end side portion 42B can also be reduced, and the working load when grinding the fixing plate can be reduced as described above.

[0058] In FIG. 9(c) showing the third modified form, in this dowel pin 8C, the entire base end side portion 42C extending from the pin body 38 to the base end side is formed in a thin cylindrical shape, and the outer diameter of the base end side portion 42C is small. The outer diameter d of the base end side portion 42 is formed to be about 2 / 5 to 4 / 5 (2D / 5 ≤ d ≤ 4D / 5) of the outer diameter D of the base end side end face of the pin body portion 38. When configured in this way, for example, two annular protrusions 62C are provided on the base end side portion 42C. Incidentally, one or three or more of these annular protrusions 62C may be provided.

[0059] It can be similarly applied to the forms shown in FIGS. 10 to 12 as a dental laboratory work model. Incidentally, in FIGS. 10 to 12, the entire dental laboratory work model is not shown. In the second embodiment shown in FIG. 10, the support base and the fixing plate are shown, and in the third and fourth embodiments shown in FIGS. 11 and 12, only their support bases are shown.

[0060] In FIG. 10 showing the dental laboratory working model of the second embodiment, in addition to the first and second engaging projections 24 and 26, a plurality of small projections 82 are provided on this support base 10D (support base body 12D). In this embodiment, the plurality of small projections 82 are provided at substantially equal intervals along the longitudinal direction of the support base 10D in the inner region S between the plurality of insertion holes 18 and the second engaging projection 26 on the upper wall 16D of the support base 10D (support base body 12D).

[0061] Corresponding to the plurality of small projections 82 on the support base 10D side, a plurality of small recesses 84 are provided at intervals in the longitudinal direction on the lower surface of the fixing plate 6D, and the small projections 82 corresponding to these small recesses 84 are detachably engaged. The above-described dowel pins 8 (8A to 8C) can be similarly applied to the dental laboratory working model in such a form. Other configurations of this second embodiment are the same as those of the above-described first embodiment.

[0062] Also in this second embodiment, the distal ends of the plurality of dowel pins 8 on the fixing plate 6D side are inserted into the plurality of insertion holes 18 on the support base 10D side, and the fixing plate 6D is placed and supported on the upper wall 16D of the support base 10D. In this supported state, as understood from the above description, the first and second engaging projections 24 and 26 on the support base 10D side and the first and second engaging recesses 44 and 46 on the fixing plate 6D side are engaged with each other, and the first and second protruding portions 28 and 30 on the support base 10D side and the first and second concave portions 48 and 50 on the fixing plate 6D side are engaged with each other, and the first and second concave portions 32 and 34 on the support base 10 side and the first and second protruding portions 52 and 54 on the fixing plate 6D side are engaged with each other. In addition, the plurality of small projections 82 on the support base 10D side and the plurality of small recesses 84 on the fixing plate 6D side are engaged with each other. Since they are engaged in this way in this second embodiment, the horizontal engagement strength between the fixing plate 6 and the support base 10 (support base body 12) can be further increased, and rotation or wobbling of the cut fixing plate 6 with respect to the support base body 12 can be more reliably prevented.

[0063] In this second embodiment, since the plurality of small protrusions 82 are provided between the plurality of insertion holes 18 on the support base 10D (support base body 12D) side and the second engagement protrusion 26, when configured in this way, the second engagement protrusion 26 (as well as the second protrusion 30 and the second concave portion 34) may be omitted. Alternatively, instead of such a configuration, these small protrusions 82 may be provided in the inner region between the first engagement protrusion 24 on the support base 10D (support base body 12D) side and the plurality of insertion holes 18. In this case, the first engagement protrusion 24 (as well as the first protrusion 28 and the first concave portion 32) may be omitted.

[0064] In FIG. 11 showing the dental laboratory working model of the third embodiment, on this support base 10E (support base body 12E), a plurality (five in this embodiment) of insertion holes 18a, 18b are provided in two rows. That is, the insertion holes 18a in one row are provided at intervals along the longitudinal direction of the support base 10E inside the first engagement protrusion 24, and the insertion holes 18b in the other row are provided at intervals along the longitudinal direction of the support base 10E inside the second engagement protrusion 26. Each insertion hole 18a in one row and each insertion hole 18b in the other row are arranged to oppose each other.

[0065] Corresponding to such a configuration of the support base 10E (support base body 12E), although not shown, on the lower surface of the fixing plate 6E, dowel pins are provided in two rows along the longitudinal direction of the fixing plate corresponding to the two rows of insertion holes 18a, 18b. The above-described dowel pins 8 (8a to 8D) can be similarly applied to the dental laboratory working model in such a form. The other configurations of the third embodiment are the same as those of the above-described first embodiment.

[0066] In this third embodiment, the tips of a plurality of dowel pins in two rows on the side of the fixing plate 6D are inserted into corresponding insertion holes 18a and 18b in two rows on the support base 10E side, and the fixing plate 6E is placed and supported on the upper wall 16E of the support base 10E. In this supported state, as understood from the above description, the first and second engaging protrusions 24 and 26 on the support base 10E side and the first and second engaging recesses on the fixing plate side are engaged with each other, and the first and second protruding portions 28 and 30 on the support base 10E side and the first and second concave portions on the fixing plate side are engaged with each other. At the same time, the first and second concave portions 32 and 34 on the support base 10E side and the first and second protruding portions on the fixing plate side are engaged with each other.

[0067] In FIG. 12 showing a dental laboratory working model of the fourth embodiment, the upper wall 16F of this support base 10F (support base body 12F) is formed in a substantially arc shape corresponding to a tooth shape model (not shown) of the entire upper teeth (or the entire lower teeth). A dental laboratory working model in such a form is called a full jaw type. Inside the upper wall 16F of this support base 10F (support base body 12F), a substantially semi-elliptical support recess 92 is provided. Note that in FIG. 12, the positioning protrusion 3 provided on the outer peripheral surface of the peripheral side wall 14F of the support base body 12F is omitted.

[0068] In the dental laboratory working model of this fourth embodiment, 14 insertion holes 18F are provided on the upper wall 16F of the support base 10F (support base body 12F) along the longitudinal direction of this upper wall 16F (that is, the support base body 12F). In the inner region S between these insertion holes 18F and the second engaging protrusion 26F, a plurality of small protrusions 82F are provided in the same manner as in the second embodiment described above.

[0069] In this fourth embodiment, corresponding to a plurality (14 in this embodiment) of insertion holes 18F on the support base 10F side, although not shown, 14 dowel pins are provided along the longitudinal direction on the lower surface of the fixing plate as described above. Further, corresponding to the first and second engaging protrusions 24F and 26F on the support base 10F side, although not shown, first and second engaging recesses are provided on both side edges of the lower surface of the fixing plate. Further, corresponding to the first and second protruding portions 28F and 30F on the support base 10F side, although not shown, first and second concave portions are provided on the lower surface of the fixing plate, and corresponding to the first and second concave portions 32F and 34F on the support base 10F side, although not shown, first and second protruding portions are provided on the lower surface of the fixing plate for the emperor. The above-described dowel pins 8 (8A to 8C) can be similarly applied to such full-jaw types. Other configurations of this fourth embodiment may be the same as those of the above-described second embodiment.

[0070] As described above, various embodiments of the dental laboratory working model according to the present invention and the dowel pins used therefor have been described. However, the present invention is not limited to these embodiments, and various modifications and corrections can be made without departing from the scope of the present invention.

Explanation of Reference Numerals

[0071] 2 Dental laboratory working model 4 Tooth-shaped model 6, 6D Fixing plate 8, 8A, 8B, 8C Dowel pin 10, 10D, 10E, 10F Support base 12, 12D, 12E, 12F Support base body 18, 18a, 18b, 18F Insertion hole 24, 24F, 26, 26F Engaging protrusion 28, 28F, 30, 30F, 52, 54 Protruding portion 32, 32F, 34, 34F, 48, 50 Concave portion 38 Pin main body portion 40 Tip side portion 42, 42A, 42B, 42C Base end side portion 82,82F small protrusion 84 small recess

Claims

1. A dental laboratory working model comprising a fixing plate to which a tooth-shaped model is fixed, a plurality of dowel pins implanted in the fixing plate, and a support base for supporting the fixing plate, wherein a plurality of insertion holes for inserting the plurality of dowel pins are provided on the upper surface of the support base, and at least the insertion-side openings of the plurality of insertion holes are formed in a conical shape with a gradually decreasing inner diameter toward the tip side, the plurality of dowel pins have a pin body portion supported by the plurality of insertion holes of the support base, a tip-side portion extending from the pin body portion toward the tip side, and a base-side portion extending from the pin body portion toward the base side. The pin body portions of the plurality of dowel pins are formed in a conical shape with a gradually decreasing outer diameter toward the tip side corresponding to the insertion-side openings of the plurality of insertion holes on the support base side, and the base-side portions of the plurality of dowel pins are embedded in the fixing plate, when the plurality of dowel pins are inserted into the plurality of insertion holes and the fixing plate is placed on the support base, the outer peripheral surfaces of the pin body portions of the plurality of dowel pins are supported by the inner peripheral surfaces of the insertion-side openings of the plurality of insertion holes on the support base side. In this placed state, the tip-side portions of the plurality of dowel pins are substantially not supported by the inner peripheral surfaces of the plurality of insertion holes on the support base side. A dental laboratory working model characterized by this.

2. The dental laboratory working model according to claim 1, wherein the axial length of the pin body portion of the plurality of dowel pins is 1.2 to 5.0 mm.

3. The dental laboratory working model according to claim 1, wherein the end portions of the base-side portions of the plurality of dowel pins are formed in a conical shape, a stepped shape, or a thin cylindrical shape such that the outer diameter of the end surface is smaller than that of other portions of the base-side portions.

4. At least a part of one side edge on the upper surface of the support base is provided with a first engaging protrusion protruding upward, and a plurality of first protruding portions and a plurality of first concave portions are alternately provided inside the first engaging protrusion. Furthermore, on at least a part of one side edge of the lower surface of the fixing plate, a first engaging recess is provided corresponding to the first engaging protrusion on the support base side. Also, inside the first engaging recess on the fixing plate side, a plurality of first concave portions and a plurality of first protruding portions are alternately provided corresponding to the plurality of first protruding portions and the plurality of first concave portions on the support base side. When the plurality of dowel pins are inserted into the plurality of insertion holes and the fixing plate is placed on the support base, the first engaging protrusion on the support base side is engaged with the first engaging recess on the fixing plate side, and the plurality of first protruding portions and the plurality of first concave portions on the support base side are engaged with the plurality of first concave portions and the plurality of first protruding portions on the fixing plate side. The dental technician's working model according to claim 1, characterized in that.

5. On a part of both side edges of the upper surface of the support base, a first engaging protrusion and a second engaging protrusion protruding upward are provided. Also, inside the first engaging protrusion, a plurality of first protruding portions and a plurality of first concave portions are alternately provided, and on the inner surface of the second engaging protrusion, a plurality of second protruding portions and a plurality of second concave portions are alternately provided. Furthermore, on a part of both side edges of the lower surface of the fixing plate, a first engaging recess and a second engaging recess are provided corresponding to the first engaging protrusion and the second engaging protrusion on the support base side. Also, inside the first engaging recess on the fixing plate side, corresponding to the plurality of first protruding portions and the plurality of first concave portions on the support base side, a plurality of first concave portions and a plurality of first protruding portions are alternately provided, and corresponding to the plurality of second protruding portions and the plurality of second concave portions on the support base side, a plurality of second concave portions and a plurality of second protruding portions are alternately provided. When the plurality of dowel pins are inserted into the plurality of insertion holes and the fixing plate is placed on the support base, the first engaging protrusion and the second engaging protrusion on the support base side are engaged with the first engaging recess and the second engaging recess on the fixing plate side, and the plurality of first protrusions, the plurality of second protrusions, the plurality of first concave portions, and the plurality of second concave portions on the support base side are engaged with the plurality of first concave portions, the plurality of second concave portions, the plurality of first protrusions, and the plurality of second protrusions on the fixing plate side. The dental laboratory working model according to claim 1, characterized in that

6. In the inner region between one side edge of the upper surface of the support base and the plurality of insertion holes, a plurality of small protrusions are provided, and on the lower surface of the fixing plate, a plurality of small recesses are provided corresponding to the plurality of small protrusions on the support base side. When the plurality of dowel pins are inserted into the plurality of insertion holes and the fixing plate is placed on the support base, the plurality of small protrusions on the support base side are engaged with the plurality of small recesses on the fixing plate side. The dental laboratory working model according to claim 1, characterized in that

7. A dowel pin inserted and supported in an insertion hole provided in a support base for supporting a fixing plate, It has a pin main body portion supported by the insertion hole of the support base, a tip side portion extending from the pin main body portion toward the tip side, and a base end side portion extending from the pin main body portion toward the base end side and embedded in the fixing plate. The pin main body portion is formed in a conical shape with an outer diameter gradually decreasing toward the tip side so as to correspond to the shape of the insertion side opening of the insertion hole. In a state where the pin main body portion is mounted on the insertion side opening of the insertion hole, the tip side portion is configured not to be substantially supported by the inner peripheral surface of the insertion hole. A dowel pin characterized by that.

8. The dowel pin according to claim 7, characterized in that the axial length of the pin main body portion is 1.2 to 5.0 mm.

9. The dowel pin according to claim 7, characterized in that the end portion of the base end side portion is formed in a conical shape or a stepped shape so that the outer diameter of its end surface is smaller than that of other portions of the base end side portion.

Images