JP6427810B2 - Dental prosthesis creation device - Google Patents

Description

  The present invention relates to a dental prosthesis making apparatus, and more particularly, to a dental prosthesis making apparatus in which a mounting plate having a tooth block mounted on an upper surface thereof is positioned and held on a cradle.

  When a part of the tooth is missing or the tooth is missing, a dental prosthesis is artificially created, and thereby the tooth at the missing part or the extracted part is compensated. When preparing such a dental prosthesis, first put a lump of silicon rubber or alginic acid on the tray and put it in the patient's mouth, and the patient bites this lump of silicon rubber or alginic acid, An uneven inverted shape of the extraction part is obtained. Such uneven silicon rubber or alginic acid is inverted with plaster to reproduce a tooth shape having the same shape as the actual tooth as shown in FIG. That is, the tooth mold 50 is made of gypsum. Thereafter, the lower surface of the tooth mold 50 is cut to a flat surface 52 along the cutting line 51 shown in FIG. 9 (see FIG. 10).

  Thereafter, as shown in FIG. 10, an insertion hole 53 is formed in the flat lower surface 52 of the tooth block 50, and the base side portion of the positioning dowel pin 54 is inserted and fixed in the insertion hole 53. Then, the tip portion of the dowel pin 54 protruding from the tooth block 50 is fitted into the guide sleeve 55 and combined.

  Thereafter, as shown in FIG. 10, the cradle 59 is formed of gypsum. That is, the dowel pin 54 is implanted on the lower surface, and the tooth block 50 with the guide sleeve 55 fitted to the dowel pin 54 is arranged on the mold frame, and the plaster 58 is poured into the mold frame to receive the pedestal 59. Is molded. Then, the lower end portion of the plaster cradle 59 is flattened by the cutting line 60. As a result, a pedestal 59 having a flat bottom surface 61 is formed as shown in FIG. In addition, the operation | work which pours said gypsum takes time in order to repeat about 3 times including the attachment with respect to the below-mentioned articulator.

  The tooth block 50 positioned through the dowel pin 54 by the gypsum pedestal 59 in this manner is attached to the receiving plate 62 of the articulator. After this, by cutting the missing tooth portion of the tooth block 50 with a cutting line 65, a tooth piece 67 is obtained (see FIG. 13). Such a tooth-shaped piece 67 serves as a jig that is processed by the method of a dental technician when processing a convex shape made of wax or a prosthesis of a tooth defect portion obtained by pouring metal.

  When creating a dental prosthesis using the tooth-shaped piece 67, first, a wax crown is created to cover the missing portion 68 of the tooth-shaped piece 67 and restore the complete tooth. At this time, the shape of the defect portion is reproduced on the tooth-shaped piece 67 with wax. When the wax defect is made, the tooth piece 67 is attached to the cut position of the cradle 59 and is combined with another tooth block 50 by the dowel pin 54. And in this state, it engages with an articulator and confirms the meshing with the opposite tooth.

  When it is determined that the crown is incomplete due to the meshing, the tooth piece 67 is removed from the cradle 59 again, and the crown is shaved or added, and the cradle 59 is again connected to the cradle 59 via the dowel pin 54. Position and inspect the engagement over the articulator. A more complete crown is created by repeating this operation many times.

  When the shape of the wax crown portion is determined, the crown is placed in a mold, and gypsum is poured into the gypsum to enclose the wax. Thereafter, the gypsum is heated at about 1,300 ° C. to melt and remove the wax therein. Then, a recess (cavity) is formed in the gypsum in which the convex shape of the wax is inverted inside the gypsum. An alloy crown having the same shape as the wax can be obtained by pouring and casting a molten alloy into the concave portion of the gypsum. The crown thus obtained is again attached to the missing portion 68 of the tooth-shaped piece 67 shown in FIG. 13, and the tooth-shaped piece 67 is again attached to the part cut by the cutting line 65 of the cradle 59. After this, the cradle 59 is put on the articulator and the meshing with the opposite tooth is observed. If the meshing is poor, the tooth-shaped piece 67 is removed from the cradle 59, and the missing part of the alloy crown is corrected. In this way, a prosthesis that compensates for missing or missing teeth is created.

  According to the conventional production of such a dental prosthesis, the pedestal 59 for supporting the tooth-shaped piece 67 must be formed by plaster. Accordingly, the number of steps is large, the time for creating the dental prosthesis is lengthened, and the creation work is troublesome. Moreover, since gypsum expands when it hardens | cures, if a swelling cannot be controlled, accuracy will worsen.

  The tooth-shaped piece 67 cut by the dividing cutting line 65 has a single dowel pin 54 on the lower surface thereof, but a gap is generated with respect to the tooth-shaped block 50 at the portion of the dividing cutting line 65. Therefore, when the crown 59 is attached again to the cradle 59 for correction of the crown, the tooth-shaped piece 67 is loose in the rotational direction around the axis of the dowel pin 54. This can also cause errors in the resulting prosthesis. In order to eliminate such backlash in the rotational direction, the dowel pin must be formed of a non-circular pin, or an auxiliary pin must be provided on the side of the dowel pin having a circular cross section, which makes the structure more complicated. Further, when the vicinity of the dowel pin 54 is cut, there is a drawback that the dowel pin 54 is disconnected and cannot be used. In addition, with a method in which a pin inclined surface and a pinhole inclined surface are combined as in the conventional dowel pin, accuracy cannot be obtained with a molded product. It is necessary to make it possible to absorb a large number of variations in molding and variations due to shots. For this reason, according to the conventional structure, it has been impossible to plasticize all parts.

Japanese Patent Laid-Open No. 10-201774 JP 2012-213668 A

  The subject of this invention is providing the dental prosthesis preparation apparatus which made it unnecessary to shape | mold a base with gypsum.

  Another problem of the present invention is a dental prosthesis in which the tooth-shaped piece rotates on the axis of the positioning means on the cradle, thereby preventing backlash in the rotational direction and deteriorating accuracy. It is to provide an object creation device.

  Still another object of the present invention is to provide a dental prosthesis making apparatus that does not use a dowel pin having a non-circular deformed cross section or an auxiliary pin, and that prevents backlash in the rotational direction.

  Still another object of the present invention is to provide a dental prosthesis making apparatus in which a tooth-shaped piece is easily locked and positioned by a cradle.

  Yet another object of the present invention is to provide a dental prosthesis making device in which the left and right mounting plates are common.

  Still another object of the present invention is to provide a dental prosthesis making apparatus in which a cradle can be used in common on the left and right sides.

  The above-described problems and other problems of the present invention will be clarified by the technical idea of the present invention and the embodiments thereof described below.

The main invention of the present application is to attach the tooth block to the mounting surface of the mounting plate, and at least one positioning means protruding from the opposite side of the mounting surface of the mounting plate to the engaged portion of the receiving base. In a dental prosthesis making device adapted to be engaged and positioned,
The mounting plate is composed of a synthetic resin molded body, and the positioning means of the mounting plate is composed of two elastic claws, and the engaged portion of the cradle is an array of the two elastic claws. Composed of elongated holes extending in the direction,
Engaging protrusions are formed on the outer sides of the two elastic claws in the arrangement direction, and the mounting plate is engaged with the edge of the elongated hole of the cradle. The present invention relates to a dental prosthesis creation device positioned at a predetermined position of a cradle.

  Here, the pair of elastic claws may generate a resilient force in a direction away from each other when inserted into the elongated hole of the cradle. The pair of elastic claws may be arranged in a direction intersecting with the arrangement direction of the teeth. Moreover, the base side of the engaging protrusion may be engaged with a portion of the edge of the elongated hole of the cradle.

Further, the mounting plate may be a synthetic resin molded body integrally including the pair of elastic claws. The cradle may be made of a synthetic resin molded body, and the elongated hole may be formed in a plate-like portion on the upper surface of the cradle.

Further, both sides may be symmetrical with respect to a center line passing through the center of the mounting plate teeth in the arrangement direction, and the mounting plate may be common to the left and right. Further, both sides may be symmetrical with respect to a center line passing through the center of the dentition in the arrangement direction of the teeth, and the cradle may be common to the left and right.

The main invention of the present application is to attach the tooth block to the mounting surface of the mounting plate, and to engage the positioning means protruding from the opposite side of the mounting surface of the mounting plate with the engaged portion of the receiving base. In the dental prosthesis making device designed to be positioned by
The positioning means of the cradle is composed of two elastic claws that make a pair, and the engaged portion of the cradle is composed of a long hole that extends in the arrangement direction of the two elastic claws,
Engaging protrusions are formed on the outer sides of the two elastic claws in the arrangement direction, and the mounting plate is engaged with the edge of the elongated hole of the cradle. It is designed to be positioned at a predetermined position of the cradle.

  Therefore, according to such a dental prosthesis making apparatus, a tooth-shaped piece obtained by cutting a mounting plate with a predetermined cutting line together with a tooth-shaped block receives two elastic claws formed on the lower surface thereof. The mounting plate is inserted into the long hole of the base, and the engaging protrusion formed on the outer side in the arrangement direction of the two elastic claws is engaged with the edge portion of the long hole, so that the mounting plate is in a predetermined position of the base. It will be positioned and attached to. Therefore, a dental prosthesis making apparatus is achieved by preparing a cradle having a long hole on the upper surface, for example, made of synthetic resin, and it is not necessary to mold the cradle with plaster. The tooth-shaped pieces divided here do not cause backlash in the rotational direction because the two elastic claws are engaged with both ends of the long hole. It can be achieved with high accuracy, and a dental prosthesis with higher accuracy can be obtained.

It is the top view (A) and bottom view (B) of a mounting plate. It is a side view inside a mounting plate. It is an external appearance perspective view of the attachment board which expanded a part of the reverse state. It is the XY sectional view (A) and Y to Y sectional view (B) in FIG. 1B of an elastic nail | claw. It is the top view (A) and bottom view (B) of a cradle. It is a side view inside a cradle. It is a ZZ line sectional view in Drawing 5A. It is an expanded longitudinal cross-sectional view which shows the engagement structure of the attachment board with respect to the receiving stand by an elastic nail | claw. It is a front view of the tooth type of gypsum. It is a longitudinal cross-sectional view of a state in which dowel pins are attached to the lower part of a plaster tooth mold. It is a longitudinal cross-sectional view of a state in which a plaster tooth mold in which a dowel pin is implanted is fixed on a receiving base. It is a longitudinal cross-sectional view of the state attached to the articulator through the cradle tooth mold. It is a longitudinal cross-sectional view of the tooth-type piece obtained by cutting the gypsum tooth type | mold which attached the dowel pin.

  The present invention will be described below with reference to an embodiment shown in the drawings. First, the configuration of the mounting plate 10 of the present embodiment will be described with reference to FIGS. The mounting plate 10 is a plate-like body having an arc shape formed of, for example, ABS resin, and the upper surface thereof is a flat mounting surface 11. A tooth block is attached to the mounting surface 11 by bonding. Further, as shown in FIGS. 1B, 2 and 3, elastic claws 12 are formed on the lower surface so as to protrude in pairs. Two elastic claws 12 are paired in a direction orthogonal to the direction of tooth arrangement, and six pairs of such elastic claws 12 are provided, for example.

  As shown in FIG. 3 and FIG. 8 in an enlarged manner, the elastic claw 12 is formed with trapezoidal engagement protrusions 13 that protrude outward in the outer portions of each other. The engaging protrusion 13 has an upper end portion (in FIG. 3, the top and bottom are depicted upside down) within a range of 30 to 60 degrees with respect to the side surface of the engaging protrusion 13, for example, an inclined surface of 45 degrees. An engaging edge 14 is formed. Further, the lower end side of the engaging projection 13 is a gently inclined guide slope 15 and is guided by the guide slope 15 when inserted, and the pair of elastic claws 12 are elastically deformed in a direction close to each other. Yes. Further, longitudinal ribs 17 are formed on the side surface perpendicular to the side surface on which the engagement projection 13 of the elastic claw 12 is formed (see FIG. 3) so as to eliminate backlash during mounting.

  Further, as shown in FIGS. 1A and 1B, the mounting plate 10 of the present embodiment has both sides thereof with respect to a center line 16 that passes through the center portion in the length direction of the mounting plate 10 and in the tooth arrangement direction. They are symmetrical to each other. Therefore, such a mounting plate 10 can be used in common on the left and right. That is, it can be used in common on the left and right by simply reversing the mounting direction. Further, only one type of mold for molding the mounting plate 10 is required.

  Next, the cradle 20 that holds the mounting plate 10 on its upper surface will be described with reference to FIGS. The cradle 20 is a molded product integrally formed of a synthetic resin molded body, for example, ABS resin, and is configured by a holding surface 21 having a flat upper surface. Six long holes 22 are formed in the holding surface 21 along the length direction of the cradle 10. As shown in FIG. 8, these long holes 22 are larger on the holding surface 21 side and smaller on the opposite side, the inner side surface is formed of an inclined surface, and the pair of elastic claws 12 of the mounting plate 10 It corresponds. The length of the long hole 22 is the same as the distance between the outer portions of the pair of elastic claws 12.

  The cradle 20 is provided with an extension 23 for attachment on the inner side. The extending part 23 constitutes an attaching means for attaching the cradle 20 to the receiving plate of the articulator. Ribs 24 are formed on the lower surface of the extension 23 as shown in FIG. 5B. The cradle 20 is also configured symmetrically on both sides with respect to a center line 26 passing through the central portion in the length direction shown in FIGS. 5A and 5B. Therefore, the cradle 20 can be used in common on the left and right by such a symmetrical shape. Further, the left and right cradle 20 can be formed by a common mold.

  As described above, the dental prosthesis producing apparatus according to the present embodiment includes the mounting plate 10 shown in FIGS. 1 to 4 and the cradle 20 shown in FIGS. As shown in FIG. 8, the cradle 20 is attached by being engaged with a portion of the engaged portion 25 formed by the edge of the lower end of the long hole 22 of the cradle 20. That is, it is not necessary to plant a dowel pin on the lower surface of the mounting plate 10, fit a guide sleeve to the dowel pin, and pour gypsum into the mold to produce a cradle. As a result, the manufacturing process of the cradle using the gypsum can be completely eliminated, and the working efficiency is greatly improved.

  Further, the pair of elastic claws 12 provided on the lower surface of the mounting plate 10 are inserted into the long hole 22 portions of the cradle 20 as shown in FIG. The engaged portion 25 may be positioned by being engaged with the engaging edge 14 of the engaging protrusion 13 formed on the outer side of the elastic claw 12. At this time, the elastic claw 12 on the mounting plate 10 side is elastically deformed so as to be close to each other using the guide slope 15, and the engaged portion 25 at the lower end of the long hole 22 on the cradle 20 side is engaged. In a state in which the engagement plate 25 is over, the base portion of the engagement edge 14 at the upper end of the engagement protrusion 13 is engaged with the edge portion at the lower end of the engaged portion 25, thereby a pair of elastic claws of the mounting plate 10. 12, the mounting plate 10 is positioned on the cradle 20 and is securely held by the engaging structure of the engaging protrusion 13 and the long hole 22. It becomes possible to eliminate play.

  Here, since the pair of elastic claws 12 are engaged with the engaged portions 25 at both ends in the length direction of the long hole 22 shown in FIGS. 5A and 5B, the center between the pair of elastic claws 12 is rotated about the axis. It becomes impossible to do. That is, there is no backlash in the rotational direction around the axis, such as positioning by a single circular cross-section dowel pin. Therefore, when the mounting plate 10 is mounted on the cradle 20 with a tooth-shaped piece cut at a predetermined position, there is no backlash in the rotating direction. For this purpose, the mounting plate 10 and the cradle 20 are used. The processing accuracy of the prosthesis is improved.

  Further, when the mounting plate 10 is pulled upward in FIG. 8, the pair of elastic claws 12 are elastically deformed so as to be close to each other by the inclined surface constituting the engaging edge 14, and the elastic claws 12 are elongated holes of the cradle 20. Exit from 22 upwards. For this reason, the mounting plate 10 can be removed without turning the finger to the lower side of the cradle 20 to squeeze the pair of elastic claws 12 away from the elongated hole 22. For this reason, the workability of the mounting plate 10 is improved.

  Further, as described above, the outer surface of the mounting plate 10 that is perpendicular to the outer surface on which the engaging projections 13 of the elastic claws 12 are formed, and on the pair of outer surfaces opposite to each other, is shown in FIG. Ribs 17 as shown are formed. The distance between the tops of the ribs 17 formed on the outer surfaces opposite to each other is slightly larger than the length of the long hole 22 of the corresponding cradle 20 in the same direction. When the mounting plate 10 is first assembled into the cradle 20, the elastic claw 12 is inserted into the long hole 22 of the cradle 20, and the tops of the ribs 17 positioned on opposite sides are the long holes of the cradle 20. By cutting at the edge portion in the same direction of 22, the size of the corresponding portion between the ribs 17 becomes equal to the size in the same direction of the long hole 22 of the cradle 20. The backlash between the long hole 22 of the base 20 can be made zero.

  Moreover, since the both sides of the mounting plate 10 are symmetrical about the center line 16, they can be used in common on the left and right. Also, the cradle 20 shown in FIG. 5 can be used in common on the left and right because both sides thereof are symmetric with respect to the center line 26. Accordingly, both the mounting plate 10 and the cradle 20 are formed in common on the left and right by one type of mold.

  On the mounting plate 10 of such a dental prosthesis making apparatus, a tooth piece obtained by cutting a missing tooth portion of a tooth block along a cutting line is attached. The tooth-shaped piece becomes a work table that is processed by the method of a dental technician when processing a prosthesis of a dental convex portion made of wax or an alloy tooth obtained by pouring the alloy. It becomes a jig for the occasion.

  While the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea of the present invention. For example, various design changes can be made with respect to the shape, size, material, and the like of the mounting plate 10 and the cradle 20 in the above embodiment. In addition, the insertion / removal pressure can be freely changed with respect to the thickness of the mounting plate 10, the dimension in the direction perpendicular to the length direction of the elastic claw 12, the protruding length of the elastic claw 12, the inclination angle of the outer surface of the elastic claw 12, etc. To obtain a desired feeling of use.

  INDUSTRIAL APPLICATION This invention can be utilized for the dental prosthesis preparation apparatus for producing the dental prosthesis for supplementing the missing part of a tooth | gear, and the site | part which dropped out by the method of a dental technician.

DESCRIPTION OF SYMBOLS 10 Mounting plate 11 Mounting surface 12 Elastic claw 13 Engaging protrusion 14 Engaging edge 15 Guide slope 16 Center line 17 Rib 20 Receiving base 21 Holding surface 22 Long hole 23 Extension part 24 Rib 25 Engaged part 26 Centerline 50 Gypsum tooth type 51 Cutting line 52 Flat surface 53 Insertion hole 54 Dowel pin 55 Guide sleeve 58 Gypsum 59 Receiving base 60 Cutting line 61 Bottom surface 62 Receptor plate of the articulator 65 Dividing cutting line 67 Tooth shape piece 68 Defect

Claims (8)

A tooth block is attached to the mounting surface of the mounting plate, and at least one positioning means protruding from the side opposite to the mounting surface of the mounting plate is engaged with the engaged portion of the receiving base for positioning. In the dental prosthesis making device,
The mounting plate is composed of a synthetic resin molded body, and the positioning means of the mounting plate is composed of two elastic claws, and the engaged portion of the cradle is an array of the two elastic claws. Composed of elongated holes extending in the direction,
Engaging protrusions are formed on the outer sides of the two elastic claws in the arrangement direction, and the mounting plate is engaged with the edge of the elongated hole of the cradle. A dental prosthesis making device positioned at a predetermined position of a cradle.   The dental prosthesis making device according to claim 1, wherein the pair of elastic claws generate an elastic force in a direction away from each other when inserted into the elongated hole of the cradle.   The dental prosthesis creation device according to claim 1 or 2, wherein the pair of elastic claws are arranged in a direction intersecting with an arrangement direction of teeth.   The dental prosthesis preparation device according to any one of claims 1 to 3, wherein a base side of the engagement protrusion is engaged with a portion of an edge of a long hole of the cradle.   The dental prosthesis creation device according to any one of claims 1 to 4, wherein the mounting plate is a synthetic resin molded body integrally including the pair of elastic claws.   The dental prosthesis preparation device according to any one of claims 1 to 5, wherein the cradle is made of a synthetic resin molded body, and the long hole is formed in a plate-like portion on the upper surface of the cradle.   The dental prosthesis preparation device according to any one of claims 1 to 6, wherein both sides of the mounting plate are symmetrical with respect to a center line passing through a center portion in the arrangement direction of the teeth, and the mounting plate is common to the left and right. The dental prosthesis preparation device according to any one of claims 1 to 6, wherein both sides are symmetrical with respect to a center line passing through a center portion in the arrangement direction of teeth of the cradle, and the cradle is common to the left and right.

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