Patent DE-102009028666-B3 (DE)
Title: Producing a ceramic dental prosthesis including a frame with a supporting profile and a veneer with a snap profile, comprises fabricating the frames on the basis of the supporting profile and predetermined outer dimension made of ceramic
Inventor: ELLERBROCK CHRISTOF
IPC: A61C13/00
Filed: 2009-08-19
Granted: 2011-02-17
Abstract: The method for producing ceramic dental prosthesis (10), which includes a frame (12) with a supporting profile and a veneer (14) with a snap profile, comprises fabricating the frames on the basis of the supporting profile and predetermined outer dimension made of first ceramic, overpressing the frame with second ceramic that is different from the first ceramic, determining the position of the supporting profile in overpressed ceramic block (24) and calculating the position of the snap profile in the ceramic block, and subtractively working out the veneer from the overpressed ceramic block. The method for producing ceramic dental prosthesis (10), which includes a frame (12) with a supporting profile and a veneer (14) with a snap profile, comprises fabricating the frames on the basis of the supporting profile and predetermined outer dimension made of a first ceramic, overpressing the frame with a second ceramic, which is different from the first ceramic, determining the position of the supporting profile in the overpressed ceramic block (24) and calculating the position of the snap profile in the ceramic block, subtractively working out the veneer from the overpressed ceramic block, where the supporting profile and the snap profile are formed to the opposing sides of the dental prosthesis. The side of the frame opposite to the supporting profile correspondingly forms the contours of the snap profile. The first ceramic has high hardness than the second ceramic. The first ceramic is aluminum oxide ceramic or zirconium oxide ceramic. The second ceramic is feldspar ceramic. The first ceramic at the side of the frame opposite to the supporting profile directly contacts the second ceramic at the side of the veneer opposite to the snap profile, where the direct contact takes place over the entire side. The veneer and the frame are milled from the ceramic block in a computer-assisted manner. The frame is subtractively worked out from the ceramic block or made of additive from ceramic material. The fabricated frame is post-treated by framing, infiltrating and/or sintering. During overpressing the frame, an insertion axle of the frame is positioned parallel to the side wall of the ceramic block. The edge lengths of the frame block (20) in all three directions is 5-20% larger than the produced dental prosthesis, and lies in the area of 3-5 cmx 1.5-2 cmx 1.5-2 cm. The parameter of the ceramic block corresponds to the parameter of the frame block. The strength of the frame is 0.4-0.5 mm. The strength of the veneer is 0.1-2 mm. The determination of the position of the supporting profile takes place in the ceramic block on the basis of the edges of the frame and/or on the basis of open stumps. The open stumps are scanned, the determined data is inverted and the surface of the frame is calculated on the basis of the inverted stumps. The surface of the veneer is tempered and/or optically changed. Independent claims are included for: (1) a dental prosthesis; and (2) a method for producing body replacement parts.