Dentistry – Method or material for testing – treating – restoring – or... – By filling – bonding or cementing
Patent
1990-08-01
1991-10-15
Lieberman, Paul
Dentistry
Method or material for testing, treating, restoring, or...
By filling, bonding or cementing
106 35, 501 4, 501 7, 501 8, 501 63, 501 64, 501 68, 501 69, 501 73, 523116, A61C 504, A61K 602
Patent
active
050570188
ABSTRACT:
Means to decrease the effects of polymerization shrinkage, increase stiffness, decrease the coefficient of thermal expansion to a greater extent than previously possible, and improve the durability of composite restorations by use of improved microcrystalline glass inserts. Shaped pieces of assorted sizes within the range of one-half to 10 millimeters are heat treated to produce microcrystallinity in which the crystalline phases, such as for example stuffed beta quartz, beta-eucryptite, beta-spodumene solid solutions, and keatite and/or other phases, give the microcrystalline glass pieces exceptionally low coefficients of thermal expansion and other desirable properties. Compositions and heat treatment conditions are given to provide the insert pieces with the desired translucencies/opacities, colors, and shades, to match a range of those properties found in teeth. Treatment of the inserts with an organofunctional silane with or without an additional resin coating provides for chemical bonding with composite resins. Cavities in teeth are partially filled with unhardened composite material, and microcrystalline glass inserts of appropriate size, shape and appearance are pressed into the cavity so that the insert constitutes as much as possible of the finished restoration. The composite containing the insert is polymerized either by light, chemical, or combined cure mechanisms, and contoured and polished.
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American Dental Association - Health Foundation
Lieberman Paul
Parks William S.
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