KR102133578B1 - Method for polishing artificial tooth and device for polishing artificial tooth - Google Patents

Abstract

The present invention relates to an artificial tooth polishing method and a polishing apparatus capable of uniformly and uniformly polishing an artificial tooth in a relatively simple method, and more specifically, to fix the artificial tooth 30 to be polished at the cervical region 32 side. At the same time, while rotating around the tooth axis 33, the abrasive particles are preferably incorporated into the abrasive, preferably elastic material, with a compressor body having an injection pressure of 0.1 Mpa to 0.5 MPa on the occlusal portion 31 side of the artificial tooth 30. The elastic abrasive material is made by or by spraying. The injection of the abrasive is performed at an inclination angle θ of 0 to 90°, preferably 15 to 75° with respect to the tooth axis 33 of the artificial tooth 30, whereby the occlusal portion 31 of the artificial tooth 30 ) And the abrasive is slid on the side 38 to polish this part at the same time.

Description

METHOD FOR POLISHING ARTIFICIAL TOOTH AND DEVICE FOR POLISHING ARTIFICIAL TOOTH}

The present invention relates to a polishing method and a polishing apparatus for artificial teeth, and more particularly, to a polishing method and a polishing apparatus for artificial teeth performed by blast processing in which an abrasive material is injected with a compressor body.

Artificial teeth, such as crowns, are polished or polished on the surface of the part that comes into contact with the oral cavity before being attached to the patient's premises after shaping. ) It can also contribute to preventing the adhesion of contamination.

Finishing of these artificial teeth is usually performed manually by a qualified dental technician using a rotating tool such as a router, and attaching bits or dressers (abrasive stones) of different shapes according to the shape of the abrasive part of the artificial teeth. Although the same polishing is carried out, the individual skill level and discretion of the dental technician are different, and there is a difference in the deadline and finish time due to the difference between the abrasive material and the equipment used.

In addition, since the polishing finish is judged by each dental technician, the shape of the artificial tooth may be changed if excessive polishing is performed to improve the precision of the finish. The back may be difficult to determine the deadline.

In particular, the strength reduction due to wall thinning in resin crowns, such as resin CAD/CAM tubes called hybrid resins, which have recently been included in the application of insurance, may lead to cracks or cracks after installation.

As described above, in the case of manual polishing by individual dental work, there is a gap in finishing precision for each dental work, making it difficult to standardize and standardize the finish, and manual polishing of artificial teeth one by one requires a long time to the dental technician. It puts a lot of effort on the burden.

Therefore, there is a great demand for a polishing apparatus capable of automatically uniformly and quantitatively without manually polishing the artificial teeth.

As the polishing apparatus 100, a second rotating shaft 102 that rotates while rotating around the first rotating shaft 101 according to the rotation of the first rotating shaft 101 is installed in the following Patent Document 1 as shown in FIG. And, while fixing the artificial tooth 130 attached to the jig 145 to the tip of the holder 102 in the form of a rotating wing mounted on the tip of the second rotating shaft 102, and filling the polishing tank 104 at the same time It has been proposed to rotate and rotate the second rotating shaft 102 while the holder 103 is buried in the abrasive 160.

According to this configuration, the artificial tooth 130 fixed to the holder 103 moves within the abrasive 160 stored in the abrasive bath 104 according to the rotation of the holder 103, and is brought into contact with the abrasive 160. It is supposed to be polished.

Japanese Patent Publication No. 2015-223325

In the polishing apparatus 100 described in Patent Document 1 described above, by continuously operating the polishing apparatus 100 for a certain period of time, a plurality of artificial teeth 130 can be polished simultaneously and with the same shape finish.

However, in the polishing according to the above configuration, the abrasive 160 filled in the abrasive tank 104 is in a state in which the flow is difficult due to the adsorption force between particles, so that the artificial tooth 130 may pass through the abrasive 160. The abrasive is difficult to enter into the concave portion formed on the surface of the tooth 130, and once the abrasive enters the concave portion, it remains difficult to polish in the concave portion.

Accordingly, as shown in FIG. 6A, occlusion in the artificial teeth 130 having convex cusps 131a or concave fissures 131b, such as the occlusal surface 131 of the artificial tooth 130 modeled after the molars. The portion of the head 131a of the surface 131 is easy to polish, but the portion of the hot water outlet 131b is difficult to grind, and when polishing is performed based on the polishing condition of the head 131a, the portion of the hot water 131b that is less polished It occurs, and after polishing using the polishing apparatus 100, it is necessary to separately polish the hot-hole 131b part manually by using a fine bit or a router equipped with a Robinson brush or the like.

On the other hand, if the polishing by the polishing apparatus 100 is performed until the fissure 131b is sufficiently polished, the cusps 131a or the side surfaces 138 are excessively polished, resulting in a decrease in strength due to deformation or occlusion when mounting. There is a risk of change.

In addition, when the artificial tooth 130 is a crown (crown) as shown in FIG. 6B in cross section, the inner wall of the hollow portion 136 of the crown 130 (the part where the abutment 170 (the supporting tooth) is inserted) is inserted) When polishing is performed up to 137), when a crown is placed on the abutment 170, a gap occurs between the axial surface 171 of the abutment 170 and the inner wall 137 of the crown 130, and separation or shaking of the crown 130 after mounting Cause.

Accordingly, when polishing is performed by the method described in Patent Document 1, it is necessary to seal the hollow portion 136 so that the abrasive 160 does not enter the hollow portion 136 of the crown 130, and at the same time, the polishing tank When rotating within 104, it is necessary to securely hold the holder 103 so as not to be discharged from the crown 130 even by a large resistance received by contact with the abrasive.

In order to seal and firmly fix the hollow portion 136, the configuration described in Patent Document 1 described above, as shown by the enlarged view of FIG. 5, integrally attaches the gypsum support 145a to the tip of the support shaft 145b. Prepare the jig 145 installed with, and while fixing and mounting the crown 130 on the gypsum support 145a of the jig 145 (Patent Document 1), the jig 145 Detachment of the jig 145 and the artificial teeth by firmly installing the crown 130 against the holder 103 by bolting the support shaft 145b to the mounting hole (not shown) installed in the holder 130 And the residue of the plaster support 145a remaining in the hollow portion 136 of the crown 130 after removing the jig 145 that is firmly bonded at the same time as the operation of attaching and detaching the crown 140 to the holder 103 is complicated or It is complicated by the need to remove the adhesive.

In addition, when an artificial tooth is a crown 130, if an excitation or step between the margin part (see 134 of FIGS. 6A and 6B) and the abutment 170 constituting the outer circumferential portion of the crown 130 occurs, calculus is formed in this part. Since the piled up is the cause of alveolar pyorrhea, the marginal portion 134 abuts at the marginal portion 134 to block the boundary with the abutment as shown in FIG. 6B when the crown 130 is placed on the abutment. It should be a shape that moves continuously toward.

In addition, the margin part 134 is a thinner part than the other parts, and at the same time, it is easy to become a starting point for cracks or cracks, and constitutes the edge 135 part. In particular, the resin crown 130 maintains strength. In order to secure the thickness of the margin portion 134.

However, in the polishing method described in Patent Document 1, since the crown 130 covered with the gypsum support 145a is moved in the orthogonal direction to the tooth axis 133 within the abrasive 150, the margin part 134 or the gypsum support ( Gypsum support (145a) made of gypsum of relatively low hardness is sharpened by the abrasive material colliding in an orthogonal direction to 145a), resulting in a step between the tip (edge; 135) of the margin 134 and the gypsum support (145a). As the abrasive 160 moves along the part, the tip (edge; 135) of the margin part 134 is sharply sharpened compared to other parts. Therefore, when the crown 130 in which the edge 135 of the margin 134 is cut is mounted on the abutment 170, a step is generated at the edge 135.

In addition, in this polishing method, since the side surface 138 of the artificial tooth 130 arranged in the direction orthogonal to the movement direction is easier to polish than the occlusal surface 131 arranged parallel to the movement direction, the side polishing is performed. It is easy to proceed, and therefore, the margin portion 134 is easily thinned.

In addition, rotating the holder 130, which is subjected to a large rotational resistance by contact with the abrasive 160 filled in the abrasive bath 104, simultaneously with the need to mount a motor M generating high torque, In order to transfer the output of the motor M to the holder 103, it is necessary to mount a high-strength power transmission mechanism or the rotating shafts 101, 102, and the whole device is not only expensive, but also consumes large electric power, thus driving costs. This gets bigger.

In addition, in the above description, the case where an artificial tooth is individually manufactured for a patient such as a crown is described as an example, but mass production using a mold in a factory is performed as in the case of an artificial tooth mounted on a denture base. Even in the case of artificial teeth to be polished, there is a case where polishing is required in the production process in the factory such as polishing after being taken out of the mold, or in the same manner as in re-polishing due to fine adjustment or the like when mounted on a denture base.

Therefore, the present invention has been made to solve the problems according to the prior art, and uniformly and uniformly polishes the artificial teeth without manual by a relatively simple method, and, at the same time, especially when applied to a crown, the occurrence or breakage of looseness or shaking during installation. It is an object of the present invention to provide an artificial tooth polishing method and a polishing apparatus capable of uniformly and quantitatively polishing the entire artificial tooth while preventing polishing of the inside of the crown or excessive polishing of the margin, which may cause defects.

Hereinafter, a means for solving the problem will be described together with a code used in the form of carrying out the invention. This code is only intended to clarify the correspondence between the description of the claims and the specific content for carrying out the invention, and of course, it is not limited to the interpretation of the technical content of the present invention.

In order to achieve the above object, the method of polishing an artificial tooth of the present invention,

The artificial tooth 30 to be polished is fixed at the cervical part 32 side and rotated around the tooth axis 33 at the same time.

Blast inclined by the inclination angle θ of 0 to 90° with respect to the tooth axis 33 at the same time as facing the occlusal portion 31 of the artificial tooth 30 rotating the tip 30a. The abutment part 31 and the side surface 38 of the artificial tooth 30 are injected by spraying the abrasive 60 with a compressor body, preferably a compression pressure of 0.1 MPa to 0.5 MPa, through the nozzle 20. It is characterized by grinding (claim 1: see Fig. 3).

In addition, in the present invention, the "tooth axis 33" is the long axis of the tooth including the tooth root, and the "occlusal portion 31" is the end of the upper and lower teeth engaging side, cutting in the incisor, tip of the canine, molar teeth. Pointing to the occlusal surface, "alveolar portion 32" points to the end of the artificial tooth opposite to the occlusal portion 31, respectively.

In the above abrasive method, the abrasive 60 is preferably an elastic abrasive material made by dispersing abrasive particles in an elastic material or an elastic abrasive material made by attaching abrasive particles to the surface of a core made of an elastic material (claim 2) ).

In addition, it is preferable to spray the abrasive 60 while the through hole 24 of the blast nozzle 20 is inclined by an inclination angle θ of 15 to 75° with respect to the tooth shaft 33. (Claim 3).

In addition, while moving a plurality of artificial teeth 30 on a common movement trajectory, at the same time, the tip 20a of the blast nozzle 20 common to the plurality of artificial teeth 30 is a predetermined position on the movement trajectory. By arranging toward the phosphorus processing position P, the distal end 20a of the blast nozzle 20 can be configured to face the occlusal portion of the artificial tooth 30 at the processing position P ( Claim 4).

The polishing method may include a process in which the support shaft 45b serving as a rotation axis to the dental cervical portion 32 side of the artificial tooth 30 is installed coaxially with the dental shaft 33, in which case the artificial tooth ( 30) a synthetic resin or natural resin, wax that softens at a temperature of about 100° C. or less, for example, 60° C. at the same time as having a hollow part 36 on which the cervical part 32 side, such as a crown (hardened), is opened. Alternatively, the thermoplastic material in which the thermoplastic material containing lead is softened by heating to fill the hollow part 36 at the cervical part 32 side of the artificial tooth 30 to be polished, and soften one end of the support shaft 45b. After inserting, it is preferable to install the support shaft 45b on the artificial tooth 30 by cooling and curing the thermoplastic material by, for example, spraying of a coolant by a cold spray to form a support 45a. (Claim 5).

In addition, the polishing method of the present invention is particularly suitable to be applied to a resin molar crown (claim 6).

In addition, the polishing apparatus 1 for artificial teeth of the present invention,

A support portion for rotating the artificial tooth 30 fixed to the head portion 41 around the tooth shaft 33 is provided with a head portion 41 for fixing the artificial tooth 30 to the cervical portion 32 side ( 30) and,

At the same time as facing the distal end 20a at the arrangement position of the occlusal portion 31 of the artificial tooth 30 fixed to the head portion 31 of the support 40, the rotating shaft 42 of the head portion 41 It has a axial center 24 inclined by an inclination angle θ of 0 to 90°, and is characterized by having a blast nozzle 20 for spraying abrasives with a compressor body (claim 7: Figs. 1 and 3) Reference).

The inclination angle θ of the axial center 24 of the blast nozzle 20 with respect to the rotation axis 42 of the head portion 41 is preferably 15 to 75° (claim 8).

In addition, the polishing device 1 is provided with a plurality of the support portion 41 having a plurality of the head portion 41 moving in the same movement trajectory, the head portion 41 in the illustrated example,

Equipped with the blast nozzles 20 common to the plurality of the heads 41 arranged toward the tip 20a at a machining position P which is a predetermined position on the moving trajectory of the head 41. It can be done (claim 9).

By the configuration of the present invention described above, the following remarkable effects according to the present invention can be obtained.

The artificial tooth 30 to be polished is fixed at the cervical portion 32 side, and at the same time, it is rotated around the tooth axis 33, and the shaft centers toward the distal end 20a of the occlusal portion 31 of the artificial tooth 30 ( 24) by injecting the abrasive through the blast nozzle 20 inclined by an inclination angle θ of 0 to 90° with respect to the tooth axis, from the occlusal portion 31 side of the artificial tooth 30 to the side surface 38 The reaching part can be polished at the same time.

In addition, the abrasive thus sprayed easily penetrates into the concave portion on the surface of the artificial tooth 30, so that it can be uniformly polished even in the artificial tooth 30 having irregularities on the surface, and at the same time, the abrasive is ejected in the spraying direction. As shown in Figure 4a by spraying it is possible to generate a flow of abrasive that moves the side 38 of the artificial tooth 30 from the occlusal portion 31 side toward the cervical portion 32 side, the artificial tooth to be polished ( Even when 30) is a crown (crown; 37), it is difficult for the abrasive to enter the hollow portion 36, and it is possible to prevent the occurrence of looseness during mounting caused by the polishing of the inner wall 37 of the hollow portion 36. Can.

In addition, as described above, since the abrasive moving on the side 38 of the artificial tooth 30 moves from the occlusal portion 31 side to the cervical portion 32 side, the end portion of the margin portion 34 or the margin portion 34 (Edge) 35 can be prevented from being excessively cut, and the strength decrease due to thinning due to excessive polishing, and the occurrence of a step difference between the abutment during installation can be prevented. It is possible to appropriately prevent occurrence of separation or bonding, adhesion of tartar due to step generation, or occurrence of alveolar fistula accordingly.

When using an elastic abrasive material as the above-described abrasive 60, the elastic body, which is a constituent member of the elastic abrasive material, absorbs shock when colliding with the artificial tooth 30, so that the abrasive 60 slides along the surface of the artificial tooth (sliding) ), the surface of the artificial tooth 30 can be more easily polished to a ball surface or a mirror surface while preventing excessive polishing. In particular, the axial center 24 of the blast nozzle 20 with respect to the tooth shaft 33 With a configuration inclined by an inclination angle θ of 15 to 75°, the abrasive 60 enters at an angle inclined to both the occlusal part (occlusal surface) 31 and the side surface 38 of the artificial tooth 30 Therefore, it is easy to slide the abrasive 60 to the surface of the artificial tooth 30, so that polishing with a mirror surface is easier.

In addition, while moving the plurality of artificial teeth 30 on a common movement trajectory, at the same time, the tip 20a of the blast nozzle 20 common to the plurality of artificial teeth 30 is a predetermined position on the movement trajectory. By arranging toward the phosphorus machining position P, the occlusal portion of the artificial tooth 20 in which the distal end 20a of the blast nozzle 20 is moved to the machining position P in the machining position P With the configuration to face (31), it is possible to continuously polish a plurality of artificial teeth 30 and productivity can be greatly improved.

In addition, the configuration in which the support shaft 45b, which is a rotating shaft, is provided on the cervical vertebrae 32 side of the artificial tooth 3 with a thermoplastic material that softens at a temperature of 100° C. or less, that the installation of the support shaft 45b is easy. At the same time, the cooled thermoplastic material becomes a support 45a for sealing the hollow portion 36 of the artificial tooth 30, which is a crown, to prevent the abrasive from entering the hollow portion 36, and also after the polishing is completed. The removal of the support 45a or the support shaft 45b can be easily performed by heating below 100° C., for example, washing with hot water or hot water.

Further, in the polishing method of the present invention in which the abrasive 60 is sprayed together with the compressor body, as described above, the abrasive can easily enter the concave portion formed on the surface of the artificial tooth 30, and polishing can be performed. As in the case where the artificial teeth 30 are artificial teeth of the molars, the artificial teeth 3 having concavities and convexities on the occlusal part (occlusal surface) 31, such as a cusp 31a or a fissure 31b, are also convex cusps 31a. ) And the concave portion of the fissure 31b can be uniformly polished, and the concave portion of the fissure 31b is not manually polished, and the convex cusps 31a are not excessively polished. Thus, the entire artificial tooth 30 can be uniformly polished.

Therefore, the polishing method and polishing apparatus of the present invention are suitable for use in polishing artificial teeth made of resin, which tends to be excessively polished due to relatively soft materials, and which, when excessively polished, results in a decrease in strength, April 2014 As a result of the insurance listing in advanced medical care on the 1st, it is possible to appropriately cope with the polishing of CAD/CAM pipes made of hybrid resins, which have high demand for mass grinding due to increased demand.

1 is a front perspective view of the polishing apparatus of the present invention.
2 is a side perspective view of the polishing apparatus of the present invention.
3 is an explanatory view of the polishing method of the present invention.
4A and 4B are explanatory views of polishing for a crown (wanggon), and FIG. 4A shows a case where polishing is performed under the conditions of the present invention, and FIG. 4B shows a case where polishing is performed outside the scope of the present invention.
5 is an explanatory view of a conventional polishing apparatus (Patent Document 1).
6A and 6B are explanatory views of the artificial tooth, FIG. 6A is a front view of the molar crown, and FIG. 6B is a cross-sectional view of the molar crown.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[Polishing target]

The object to be polished by the polishing method of the present invention is a dental artificial tooth, and if it is a dental artificial tooth, it can be applied to all types of artificial teeth regardless of its type.

In addition to artificial teeth that are installed directly on the abutment teeth, such as crowns (crowns) or bridges, such types of artificial teeth are implanted and used in denture bases, like artificial teeth used in dentures (dentures). Like the artificial teeth used for the artificial teeth used as a superstructure installed on the artificial roots through abutment teeth, including those mounted on the patient through members other than the abutment teeth, preferably crowns (crowns) or bridges, implants The artificial tooth 30 is provided with a hollow portion 36 that is opened from the cervical portion 32 side, such as an artificial tooth that is a superstructure of the root.

In addition, the types of artificial teeth are those that imitate incisors, canines, and premolar teeth with respect to the types of natural teeth, and they are all subject to treatment by the polishing method of the present invention.

In addition, there are various types of materials for artificial teeth, such as metal, ceramic, and resin, but the method of the present invention is applicable to artificial teeth of any material, and artificial teeth of various materials known as artificial teeth. Is applicable.

In addition, the durability due to the difference in the material of the artificial teeth is the most inferior to the resin teeth compared to those made of metal or ceramic, and this tendency is compounded with synthetic silica, such as hybrid resin, filler made of ceramic, or the like. Since the composite resin with improved abrasion resistance is also the same, the influence of strength reduction due to thinning due to excessive polishing is remarkable even in artificial teeth made of a resin containing a hybrid resin.

In addition, the decrease in strength due to thinning is a problem that occurs remarkably in a crown (crown) having a hollow portion 36 for inserting an abutment, and at the same time, uneven polishing is an occlusal surface 31 ) It is easy to occur in the artificial teeth modeled on the molar teeth where the convex cusps 31a and the concave fissures 31b exist.

Therefore, the present invention is not limited thereto, and even artificial teeth with irregularities such as artificial teeth of the molars can be uniformly polished without stains, and the hollow portion 36 is polished as described later even when the crown is applied. The polishing method of the present invention, which is difficult and prevents excessive polishing of the margin portion 34, as described later, is made of a large amount of polishing as demand increases due to the conversion of resin molar crowns, especially tip medical care to insurance. It is suitable for polishing CAD/CAM tubes made of hybrid resins, which are in increasing demand.

In the following description, unless otherwise specified, the polishing method of the present invention will be described as an example in which the CAD/CAM tube (molar) made of hybrid resin is used as a polishing object.

[Polishing device]

(1) Overall composition

1 and 2 show a configuration example of the polishing apparatus 1 used in the polishing method of the present invention.

The polishing apparatus 1 shown in FIGS. 1 and 2 is a so-called “blast processing apparatus” that processes a workpiece by spraying a compressed body (compressed air) and abrasive-based abrasives, and accommodates a component device, and at the same time A blast nozzle (20) having a cabinet (10) having a space to be 11 and spraying abrasives with a compressor body against the artificial teeth (30) to be polished in the processing chamber (11) formed in the cabinet (10) It is provided.

The lower portion of the processing chamber 11 is formed in an inverted trapezoidal shape, and a hopper 12 for collecting the abrasive 60 sprayed through the blast nozzle 20 is formed, and in the processing chamber 11 The abrasive 60 sprayed and dropped is recovered into the hopper 12 and at the same time, the recovered abrasive 60 can be sprayed again through the blast nozzle 20 through the abrasive introduction pipe 13. .

In the illustrated embodiment, this blast processing apparatus is provided with a suction blast nozzle 20 shown in an enlarged cross-sectional view in FIG. 2, and is introduced at a rear end of the blast nozzle 20 in a so-called "suction type" type A negative pressure is generated in the mixing chamber 23 by spraying the compressor body toward the nozzle tip 22 by the jet 21, and the abrasive material in the hopper 12 through the abrasive introduction pipe 13 is generated by the negative pressure ( 60) is configured to be sucked by the nozzle tip 22 by incorporating the compressed body in the mixing chamber 23 at the same time as suctioning the abrasive 60.

As described above, although the illustrated embodiment shows an example in which the polishing apparatus 1 of the present invention is constituted by a suction-type blast processing apparatus, a known blast processing apparatus used in the polishing apparatus of the present invention is used instead of the known suction-type configuration. Various blast processing apparatus configurations can be employed.

As such a blast processing apparatus, a gravity blast processing apparatus for spraying abrasive material dropped from a non-illustrated abrasive tank disposed on the upper part of the cabinet 10 onto a compressor body, and a compressed body separately introduced by introducing a compressor body into a tank into which the abrasive material is introduced A direct-pressure blast processing apparatus for injecting and spraying the abrasive flow from the abrasive tank to the compressed-body flow from the gas supply source, and a blow-type blast processing apparatus for spraying the direct-flow compressed body flow on the gas flow generated by the blowing unit, etc. These are commercially available, and all of them can be employed as the structure of the abrasive accelerator in the polishing apparatus 1 of the present invention.

In addition, reference numeral 14 in FIGS. 1 and 2 is a dust collector, which sucks air in the processing chamber 11 through an exhaust pipe 15 to collect dust mixed in the exhaust into a filter 14a installed in the dust collector 14. It is configured to discharge clean air after the dust has been removed.

(2) Support

In the polishing method of the present invention, the artificial tooth 30 to be polished is fixed to the cervical region 32 side and rotates around the tooth axis 33 as shown in FIG. 3, and the artificial tooth 30 rotates. ) Toward the occlusal portion 31 of the abrasive with a compressor body.

In order to enable spraying of the abrasive in such a state, the abrasive device 1 used in the polishing method of the present invention supports the artificial tooth 30 in the above-described processing chamber 11 and at the same time the tooth shaft 33 It has a support 40 for rotating around.

As shown in the enlarged view in Fig. 1, this support is provided with a head portion 41 for rotating and installing the artificial tooth 30 to be polished, and the rotating shaft 42 and the artificial tooth 30 of the head portion 41 ) By installing the artificial tooth 41 with respect to the head portion 31 so that the tooth axis 33 is disposed on the same axis, the artificial tooth 30 to be polished is fixed at a predetermined position and the tooth axis 33 is Can be rotated to the center.

The installation of the artificial teeth 30 to the head portion 41 can maintain the artificial teeth 30 in a fixed state even by spraying a mixed fluid of a compressor body and abrasive material injected by the blast nozzle 20 described above. If there is, any method may be installed. In the illustrated embodiment, as an example, a jig 45 having a support 45a and a support shaft 45b is prepared, and artificial to the support 45a of the jig 45 The mechanical chuck installed on the head portion 41 of the support 40 while simultaneously fixing the tooth portion 32 side of the artificial tooth 3 to the jig 45 by covering the tooth 30 43) Alternatively, install and fix on a magnetic chuck (not shown).

The installation of the jig 45 for the artificial tooth 30 is also good to fix the artificial tooth to the jig with the gypsum support using an adhesive as described in the prior art, but the artificial tooth 30 to be polished is crown (crown ) Is provided with a hollow portion 36 opened from the cervical portion 32 side, synthetic resin or natural softened at a temperature of about 100 ℃ or less, for example, about 60 ℃ from the cervical portion 32 side of the artificial tooth 30 After filling the hollow portion 36 in a softened state by heating a thermoplastic material containing resin, wax, or lead, and inserting the support shaft 45b, for example, by spraying a coolant by cold spray The jig 45 provided with the above-described support 45a and the support shaft 45b in the artificial tooth 30 is formed by cooling and curing the thermoplastic material in the hollow portion 36 to form the above-described support 45b. Can be fixed.

In this way, by forming the support 45a with the thermoplastic material filled in the hollow portion 36, the artificial tooth 30 can be firmly fixed by curing the thermoplastic material, and after the polishing is finished, The jig 45 can be easily removed by softening and melting the thermoplastic material constituting the support 45a by heating at a temperature of 100° C. or less, for example, washing with hot water or hot water.

In the polishing apparatus 1 of the present embodiment, the head portions 41 of each support 40 are the same by erecting the above-described support 40 further at a plurality of intervals around the turntable 50 and rotating the turntable 50. It is configured to be able to move on the trajectory.

By constructing in this way, by attaching the artificial teeth 30 to each of the head portions 41 of each support 4, the artificial teeth 30 mounted on the head portion 41 according to the rotation of the turntable 50 It is configured to be able to sequentially move to the machining position (P) installed at a predetermined position on the trajectory.

The rotation of the turntable 50 is intermittently rotated at a time interval necessary for polishing one artificial tooth at a predetermined angle corresponding to the number of installed support 40, and the artificial tooth moved to the above-described processing position P (30) may be configured to sequentially polish one by one, or by sequentially rotating the above-described turntable 50 at a predetermined rotational speed to sequentially spray the abrasive to the artificial teeth passing through the machining position (P) to a plurality It may be configured to simultaneously process the artificial teeth 30.

For example, in this embodiment, while rotating the head portion 41, that is, each artificial tooth 30 at a rotational speed of 4 to 100 min ^-1 (rpm), the turntable 50 is set for each artificial tooth. By rotating at an angle of 72° for each time (for example, each 2 minutes), each artificial tooth 30 is disposed at each processing position P for 2 minutes to be polished, and instead of this configuration, the turntable 50 is used. It may be configured to simultaneously polish a plurality of artificial teeth by continuously rotating at a predetermined rotational speed.

(3) Blast nozzle arrangement

The above-described blast nozzle 20 for spraying the abrasive to the artificial tooth 30 installed on the head portion 41 of the support 40, as shown in Figure 3, the front end (20a) of the above-described support 40 At the same time facing the occlusal portion (occlusal surface) 31 of the artificial tooth 30 installed on the head portion 41 of the same time, the rotation axis 42 of the head portion 41, that is, the tooth axis of the artificial tooth 30 ( With respect to 33), the inclination angle θ of the axial center 24 of the blast nozzle 30 is arranged to be 0 to 90°.

That is, in the polishing apparatus 1 of the present invention, the arrangement range of the blast nozzle 20 described above is a range indicated by a thick arrow in FIG. 3.

Preferably, the above-mentioned inclination angle θ is 15 to 75°, and it is preferable that the abrasive material is incident with an angle with respect to the occlusal surface 31 and side surface 38 of the artificial tooth 30.

In a configuration in which one support 40 is installed in the processing chamber 11, as shown in FIG. 3, the blast nozzle 20 is placed at the above-described position and angle only for one support 40, but as described above In the configuration of the polishing apparatus 1 of the present embodiment in which a plurality of supports 40 are installed at equal intervals in the periphery of the turntable 50, the tip 20a of the blast nozzle 20 described above is predetermined on the moving trajectory of the head. With respect to the artificial teeth 30 which are arranged toward the processing position P of the plurality of artificial teeth 30 disposed on each support 40 and placed toward the processing position P installed at the position, the tactic The tip 20a of the blast nozzle 20 is configured to face in one direction and angle.

[Polishing condition]

(1) Used abrasive

As the abrasive material used in the artificial tooth polishing method of the present invention, which is carried out using the polishing apparatus 1 described above, various abrasives known in the art can be used, and metal, mineral, ceramic, resin, glass, and plant systems All of the various abrasive particles can be used in the polishing method of the present invention, and the material or particle size of the abrasive material can be appropriately selected according to the material or finishing state of the artificial tooth to be polished.

Preferably, the polishing material used in the polishing method of the present invention is preferably an elastic polishing material.

The elastic abrasive material may have a structure in which an abrasive material is attached to the surface of a nucleus made of an elastic material, or may be dispersed by mixing abrasive particles in the elastic material. Can be used.

In addition, various types of abrasive materials such as those formed by gelatin or glucomannan, other than rubber or elastomer, have been proposed as elastic materials used for elastic abrasive materials, but the polishing method of the present invention is known to use the above materials as well as other elastic materials. Various elastic polishing materials can be used.

In the case of using an elastic abrasive material, the particle diameter of the elastic abrasive material to be used is not particularly limited, but preferably an average particle diameter of 200 to 1000 μm is used to polish an artificial tooth having a recess such as a fissure on the occlusal surface such as a molar tooth. Even in the case of, it is possible to grind to the inside of this concave portion.

In addition, the material and particle size of the abrasive particles mixed with the elastic material or adhered to the surface of the nucleus made of the elastic material can be appropriately selected depending on the material or finishing state of the artificial tooth to be polished, and it is preferable to obtain a glossy surface or a mirror surface. The average particle size of about several ㎛ to several tens of µm is used, and abrasive particles having a small particle size can be mixed step by step depending on the polishing state, or an attached elastic abrasive material can be used.

(2) Spray condition

The abrasive is injected with the compressor body through the blast nozzles arranged at the above-described positions and angles with respect to the artificial teeth 30 described above.

As the compressor body used for abrasive injection, a compressor body of inert gas such as argon or nitrogen may be used in addition to compressed air, and the cost of the compressor body is advantageous.

The injection pressure of the compressor body used for spraying the abrasive is selected in the range of 0.1 to 0.5 MPa depending on the material and spraying time of the artificial tooth 30 to be polished, the material and particle size of the abrasive used.

The spraying time needs to be appropriately adjusted depending on the material or shape of the artificial tooth to be polished, the material or particle size of the abrasive (abrasive particles) used, but the treatment time per artificial tooth is several tens of seconds to several minutes.

[Action, etc.]

As described above, the front end 20a of the blast nozzle 20 is directed to the occlusal surface 31 of the artificial tooth 30, and at the same time, the axial center 24 of the blast nozzle 20 with respect to the tooth axis 33 ) By injecting the abrasive with the compressor body with the inclination angle (θ) in the range of 0 to 90°, the compressor rod injected by the blast nozzle 20 collides with the artificial tooth 30 and then the artificial tooth 30 To form a flow along the surface of the.

As a result, the surface of the artificial tooth 30 is polished by an abrasive that slides the surface of the artificial tooth 30 by moving the abrasive sprayed with the compressor body according to the flow of the compressor body.

By spraying the abrasive in the above-described spraying direction, the side surface 38 of the artificial tooth 30, as shown in Figure 4a, of the abrasive toward the cervical portion 32 from the occlusal surface 31 side of the artificial tooth 30 The flow occurs, so that the edge 35 portion of the margin portion 34 is polished so that it is naturally switched from the margin portion 34 to the support, and at the same time, thinning or the like due to excessive polishing of the margin portion 34 can be prevented.

In addition, since the flow of the abrasive from the occlusal surface 31 side toward the cervical portion 32 occurs, the abrasive is difficult to enter into the hollow portion 36 even when the hollow portion 36 is polished without sealing. When the inner wall 37 of the hollow portion 36 is polished, dropping or loosening after mounting can also be prevented.

On the other hand, when the abrasive is sprayed toward the alveolar portion 32 at a position where the inclination angle θ exceeds 90°, the occlusal surface 31 is not polished, and the side 38 portion of the artificial tooth 20 is As shown in 4b, the flow of the abrasive from the cervical portion 32 side toward the occlusal surface 31 occurs so that the abrasive deletes the margin portion 34 or the edge 35 of the margin portion 34, so that the margin portion A decrease in strength due to the thinning of (34) or a step may occur between the abutment and the edge (35) of the margin portion (34) when mounted.

In addition, if the hollow portion 36 of the artificial tooth 30 is not sealed or polished in a state where the sealing is insufficient, the abrasive enters the hollow portion 36 and the inner wall 37 is polished, resulting in loosening or loosening after mounting. Although it may occur, in the polishing method of the present invention, it is possible to prevent such a decrease in strength, occurrence of a step difference, and looseness.

In addition, in the method of the present invention, the abrasive also enters into a fine concave portion formed on the surface of the artificial tooth 30, such as the fissure 31b formed on the occlusal surface 31 of the artificial tooth 30, and becomes a polished surface or a mirror surface. It is possible to grind, and each part of the artificial tooth 30 can be polished in one polishing apparatus without performing manual polishing of the separate fissure 31b.

Next, an example of a polishing test in which artificial teeth are polished by the polishing method of the present invention is shown.

[Test Methods]

Each of the artificial artificial teeth made of resin (Example 1), the artificial teeth made of metal (Example 2), and the artificial teeth made of ceramic (Example 3) were polished by the method of the present invention. Table 1 shows the materials and polishing conditions for each artificial tooth.

In addition, all artificial teeth to be treated are crowns (crowns) that mimic molar teeth.

Materials and polishing conditions of artificial teeth Example 1 Example 2 Example 3 material Hybrid resin (a silica powder having a primary particle diameter of 10 µm or less is dropped onto a resin) Cobalt chrome Zirconia Used abrasive ``Sirius Z'' manufactured by Fuji Corporation (elastic abrasive material mixed with an abrasive material in an elastomer)
Average particle diameter 800㎛ Abrasive particles: Diamond #10000 (D50: 0.6㎛) Blast
Processing equipment Suction type (see FIGS. 1 and 2) Nozzle angle of tooth axis (θ) 30° 30° 30° Injection pressure 0.2MPa 0.3MPa 0.3MPa Spraying distance 20 mm 20mmm 20 mm Rotating speed of artificial teeth 4min ^-1 30min ^-1 50min ^-1 Processing time 2 minutes/piece 3 minutes/piece 3 minutes/piece

[Test Results] (1) Example 1

The results of measuring the surface roughness of the artificial teeth before and after polishing by Example 1 (hybrid resin artificial tooth polishing) using a stylus surface roughness meter (manufactured by Tokyo Precision Manufacturing Co., Ltd.) and the results of observing the gloss state by visual inspection It is shown in Table 2 below.

Surface roughness before and after polishing (hybrid resin artificial teeth) Ra (㎛) before polishing Ra (㎛) after polishing Occlusal surface 0.82 0.08 side 1.73 0.56 Polish none Good

From the above results, the artificial tooth made of the hybrid resin can be polished by the polishing method of the present invention, and the surface roughness can be greatly improved and at the same time a good gloss can be obtained. In addition, it was possible to finish polishing the teeth. In addition, no polishing was performed on the hollow portion of the artificial teeth after polishing, and no thinning or deformation of the margins (retraction, etc.) of the margins was observed after finishing. It was possible to grind without worrying about shaking or step difference with the abutment teeth.

In addition, in Example 2 (metal crown polishing) and in Example 3 (ceramic crown polishing), it was possible to obtain an excellent gloss finish in the artificial teeth after polishing, and the method of the present invention polished the artificial teeth regardless of material. It was confirmed that it can be suitably used.

1: Polishing device
10: cabinet
11: processing room
12: Hopper
13: Abrasive introduction tube
14: dust collector
14a: filter
15: exhaust pipe
20: blast nozzle
20a: tip (of blast nozzle)
21: Jet
22: nozzle tip
23: mixing room
24: Axis
30: artificial teeth (crown)
31: occlusal part (occlusal surface)
31a: cusps
31b: fissure
32: cervical neck
33: tooth axis
34: margin
35: Edge
36: hollow
37: inner wall
38: side
40: support
41: head
42: rotating shaft
43: Chuck
45: jig
45a: support
45b: support shaft
50: Turntable
60: abrasive
100: polishing device
101: first rotation axis
102: second rotating shaft
103: holder
104: polishing bath
130: artificial teeth (crown)
131: occlusal part (occlusal surface)
131a: cusps
131b: fissure
132: cervical
133: tooth axis
134 margin
135: edge
136: hollow
137: side
145: jig
145a: Plaster support
146b: Support shaft
160: abrasive
170: abutment
171: shaft
P: Machining position
M: Motor
θ: tilt angle

Claims (9)

While fixing the plurality of artificial teeth 30 to be polished at the respective cervical part 32 side, and rotating around the respective dental axis 33, and rotating the dental axis 33 over the same movement trajectory and together,
With the front end 20a facing the occlusal portion 31 of the artificial tooth 30 rotating, the axial center 24 of the blast nozzle 20 is the tooth axis 33 and the tooth axis 33. The abrasive 60 is injected with the compressor body through the blast nozzle 20 that is inclined by an inclination angle of 0 to 90° with respect to the surface of the occlusal portion 31 orthogonal to the surface of the artificial tooth 30 A method of polishing an artificial tooth (30), characterized by polishing the occlusal portion (31) and the side surface (38). According to claim 1,
As the abrasive 60, the polishing method of the artificial tooth 30 characterized by using an elastic abrasive material made by dispersing abrasive particles in an elastic material, or an elastic abrasive material made by attaching abrasive particles to the surface of a core made of an elastic material . The method according to claim 1 or 2,
Artificial teeth (30) characterized in that the blast nozzle (20) is sprayed with the abrasive (60) in a state inclined by an inclination angle of 15 to 75° with respect to the tooth shaft (33). ) Polishing method. The method according to claim 1 or 2,
While moving the plurality of artificial teeth 30 on the moving trajectory, the tip 20a of the blast nozzle 20 on the plurality of artificial teeth 30 is a processing position that is a predetermined position on the moving trajectory ( By arranging toward P), the tip 20a of the blast nozzle 20 is configured to face the occlusal portion 31 of the artificial tooth 30 at the processing position P. Method of polishing artificial teeth 30. The method according to claim 1 or 2,
It includes a process of installing a support shaft (45b) that is a rotating shaft on the side of the cervical portion (32) of the artificial tooth (30) coaxially with the tooth shaft (33),
The artificial tooth 30 is an artificial tooth 30 having a hollow portion 36 opening from the cervical portion 32 side,
The thermoplastic material that softens at a temperature of 100° C. or less is heat-softened to fill the hollow portion 36 toward the cervical portion 32 of the artificial tooth 30 to be polished, and soften one end of the support shaft 45b. After inserting into the thermoplastic material, the method for polishing the artificial tooth (30), characterized in that the support shaft (45b) is provided on the artificial tooth (30) by cooling and curing the thermoplastic material. The method according to claim 1 or 2,
The artificial tooth (30) is a method of polishing artificial teeth (30), characterized in that the artificial teeth (30) of a molar single-tube crown made of a resin containing an inorganic filler. A plurality of support 40 for fixing a plurality of artificial teeth 30 on each side of the cervical portion 32 is provided, and each of the plurality of heads ( 41) while rotating the plurality of artificial teeth 30 fixed to each tooth axis 33, a turntable 50 for rotating the plurality of support 40 on the same movement trajectory;
At the same time, facing the distal end 20a at an arrangement position of the occlusal portion 31 of the artificial tooth 30 fixed to the head portion 41 of the support 40, and at the same time rotating shaft 42 of the head portion 41 ) Having an axial center (24) inclined by an inclination angle of 0 to 90°, and a blast nozzle (20) for spraying the abrasive (60) with the compressor body. . The method of claim 7,
An apparatus for polishing an artificial tooth, characterized in that an inclination angle of the axial center (24) of the blast nozzle (20) with respect to the rotating shaft (42) of the head portion (41) is 15 to 75°. The method of claim 7 or 8,
One of the blasts arranged to face the tip 20a at a processing position P which is a predetermined position on the moving trajectory of the head part 41 and spraying the abrasive 60 to the plurality of head parts 41. An artificial tooth polishing apparatus comprising a nozzle.

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