Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
Method of manufacturing an artificial tooth restoration
comprising a ceramic, densely sintered high strength
individual core (B) with dental porcelain (A) by powder
metallurgical manufacturing methods characterised in that the inner surface (I) of
the core (B), which will fit against one or more prepared
tooth surfaces (P) or artificial abutments are manufactured
by forming a ceramic powder mixture against a surface of a
body at which said surface is manufactured by registering
the surfaces of the prepared teeth or artificial abutments
and their mutual relationship with a three dimensional optical
or mechanical reading method either directly in the
mouth or on a model in e.g. plaster after which the registered
surfaces are reproduced in an enlarged size e.g. with
a computer controlled milling machine at which the enlargement
is calculated from the shrinkage of the ceramic material
during sintering to full density with adjustment of
(I) considering desired gap for cement.
Claim 2
Dependent Claim
55 words
Method according to claim 1 characterised in that the core is manufactured
by dry pressing a ceramic powder with a rubber tool X made
from some viscous elastic material, close to desired size
against the enlarged preparations K 2 , K 4 and K 6 made by
milling of premade plaster, graphite or polymer blanks.
Claim 3
Dependent Claim
55 words
Method according to claim 2 characterised in that the rubber tool X is made
by taking an impression of the body K 3 , K 5 or K 7 ,
manufactured from the enlarged preparations K 2 , K 4 or K 6 ,
with the addition of a shell of 1,5 - 3 mm.
Claim 4
Dependent Claim
68 words
Method according to claims 2 and 3 characterised in that after compacting of the
ceramic powder against K 2 , K 4 or K 6 , K 2 , K 4 or K 6 are repositioned
in the milling machine at which the outer contour
of the core is milled to desired shape, whereupon the core
is presintered on K 2 , K 4 or K 6 .
Claim 5
Dependent Claim
31 words
Method according to claims 2, 3 and 4 characterised in that the presintered core is
removed from K 2 , K 4 or K 6 and is sintered to full density.
Claim 6
Dependent Claim
29 words
Method according to claims 1, 2, 3 and 4 characterised in that the core material consists
of high strength, densely sintered ceramic material
with a relative density of >99%.
Claim 7
Dependent Claim
48 words
Method according to claim 5 characterised in that the ceramic material in
the core is based on one or more of the oxides Al 2 O 3 , TiO 2 ,
MgO, ZrO 2 or ZrO 2 with up to 25 mole% Y 2 O 3 or MgO.
Claim 8
Dependent Claim
25 words
Method according to claims 5 and 6 characterised in that the core material also
comprises whiskers and/or particles of SiC, TiN, ZrO 2 and/or ZrN.