DENTAL PROSTHESIS, METHOD OF DESIGNING THEREOF, AND METHOD OF PRODUCING THEREOF

Abstract

To accurately fix a dental prosthesis at a cavity or an abutment tooth, the dental prosthesis has a constitution in which a cement space C is kept on a whole face opposite to the cavity or the abutment tooth except a plurality of projection parts P contacted with the cavity or the abutment tooth and a portion near a margin line, and the dental prosthesis which is to be covered on the abutment tooth is designed by measuring a gypsum model produced based on an impression taken from an oral cavity of a patient so as to obtain three-dimensional measuring data, providing a plurality of projection parts P contacted with the abutment tooth and a portion near a margin line based on the obtained three-dimensional measuring data and setting a cement space C on a whole face opposite to the cavity or the abutment tooth except the contacting portion.

Description

BRIEF EXPLANATION OF DRAWINGS

FIG. 1 is an enlarged perspective view illustrating an example of an inlay which is a dental prosthesis according to the present invention, where projection parts approximately parallel to a tooth axis and a projection part contacted with a bottom face of a cavity are provided.

FIG. 2 is a cross sectional explanation view illustrating a state that the dental prosthesis illustrated in FIG. 1 is pre-mounted in a cavity of a tooth of a patient.

FIG. 3 is an enlarged perspective view illustrating an example of a crown which is a dental prosthesis according to the present invention, where projection parts approximately parallel to a tooth axis and a projection part contacted with a top face of an abutment tooth are provided.

FIG. 4 is cross sectional explanation view illustrating a state that the dental prosthesis illustrated in FIG. 3 is pre-mounted on an abutment tooth of a patient.

FIG. 5 is an explanation view illustrating a state that a wax model produced based on an impression taken from an oral cavity of a patient is measured so as to obtain three-dimensional data in a method of designing a dental prosthesis according to the present invention, where the dental prosthesis is an inlay.

FIG. 6 is an explanation view illustrating a state that a gypsum model of an abutment tooth, which is produced based on an impression taken from an oral cavity of a patient, is measured so as to obtain three-dimensional data in a method of designing a dental prosthesis according to the present invention, where the dental prosthesis is a crown.

Claims

1. A dental prosthesis which is to be mounted in an cavity or covered on an abutment tooth, wherein a cement space is kept on a whole face opposite to the cavity or the abutment tooth except a plurality of projection parts contacted with the cavity or the abutment tooth.

2. A dental prosthesis which is to be mounted in an cavity or covered on an abutment tooth, wherein a cement space is kept on a whole face opposite to the cavity or the abutment tooth except a plurality of projection parts and a portion within a distance of 0.1 to 1 mm from a margin line.

3. The dental prosthesis as claimed in claim 1 or 2, wherein the maximum thickness of the cement space is 15 to 100 μm.

4. The dental prosthesis as claimed in any one of claims 1 or 2, wherein the projection parts are formed to have a streak shape being approximately parallel to a tooth axis.

5. The dental prosthesis as claimed in claim 4, wherein a projection part contacted with a bottom face of the cavity is further provided in the case of the dental prosthesis which is to be mounted in the cavity, or a projection part contacted with a top part of the abutment tooth is further provided in the case of the dental prosthesis which is to be covered on the abutment tooth.

6. A method of designing a dental prosthesis, comprising steps of: producing a gypsum model based on an impression taken from an oral cavity of a patient;measuring a secondary gypsum model or a wax model produced from the gypsum model so as to obtain three-dimensional measuring data in the case of the dental prosthesis which is to be mounted in a cavity; ormeasuring the gypsum model so as to obtain three-dimensional measuring data in the case of the dental prosthesis which is to be covered on the abutment tooth; anddesigning the dental prosthesis which is to be mounted in the cavity or covered on the abutment tooth based on the obtained three-dimensional measuring data using a computer,wherein a plurality of projection parts contacted with the cavity or the abutment tooth is provided, and wherein a cement space is set on a whole face opposite to the cavity or the abutment tooth except the projection parts.

7. A method of designing a dental prosthesis, comprising steps of: producing a gypsum model based on an impression taken from an oral cavity of a patient;measuring a secondary gypsum model or a wax model produced from the gypsum model so as to obtain three-dimensional measuring data in the case of the dental prosthesis which is to be mounted in a cavity; ormeasuring the gypsum model so as to obtain three-dimensional measuring data in the case of the dental prosthesis which is to be covered on the abutment tooth; anddesigning the dental prosthesis which is to be mounted in the cavity or covered on the abutment tooth based on the obtained three-dimensional measuring data using a computer,wherein a plurality of projection parts contacted with the cavity or the abutment tooth and a portion within a distance of 0.1 to 1 mm from a margin line are provided, andwherein a cement space is set on a whole face opposite to the cavity or the abutment tooth except the projection parts and the portion within the distance of 0.1 to 1 mm from the margin line.

8. The method of designing a dental prosthesis as claimed in claim 6 or 7, wherein the maximum thickness of the cement space is 15 to 100 μm.

9. The method of designing a dental prosthesis as claimed in any one of claims 6 or 7, wherein the projection parts are formed to have a streak shape being approximately parallel to a tooth axis.

10. The method of designing a dental prosthesis as claimed in claim 9, wherein a projection part contacted with a bottom face of the cavity is further provided in the case of the dental prosthesis which is to be mounted in the cavity, and a projection part contacted with a top part of the abutment tooth is further provided in the case of the dental prosthesis which is to be covered on the abutment tooth.

11. A method of producing a dental prosthesis designed by the method of designing a dental prosthesis as claimed in any one of claims 6 to 10 by using a CAD/CAM system, the method comprising a step of cutting and grinding a block for a dental prosthesis by a cutting and grinding machine using the CAD/CAM system.

12. A method of producing a dental prosthesis designed by the designing method of a dental prosthesis as claimed in any one of claims 6 to 10 by using a CAD system, the method comprising a step of photosensitively curing a photo-curable resin by laser irradiation from an optical shaping apparatus using the CAD system, wherein the photo-curable resin is photosensitively cured for every thin section of the dental prosthesis.