Appeal 2007-2566
Application 10/243,873
B. Bachmann
[11] Bachmann discloses a radio-opaque dental retention post ("pin")
composite comprising from 60 to 80 % by volume fiber containing
between 10 and 30 % by weight zirconia, e.g., zicronium oxide, in an
epoxy resin (Bachmann col. 1, l. 54 - col. 2, l. 8 and col. 2, ll. 19-22).
[12] According to Bachmann, the fiber may be a glass fiber, a quartz fiber
or a silica fiber (Bachmann col. 1, l. 57 - col. 2, l. 3).
[13] Bachmann is silent as to refractive indices of the fibers and the resin
matrix comprising the composite.
C. Bowen
[14] Bowen discloses an inorganic, amorphous glass material for use in
combination with an organic resin to provide a composite material for
restorative or preventive dentistry, e.g., a composite dental filling
material (Bowen col. 2, ll. 6-14 and 40-43).
[15] "Within certain limitations, the present invention can be applied also
to other reinforcing filler morphologies, such as for example flakes,
fibers, rods, or large inserts" (Bowen col. 14, ll. 58-60).
[16] The inorganic amorphous glass is said to be substantially transparent
to visible light, opaque to X-rays and have a refractive index "close to
the refractive indexes of organic resins found in aesthetic composite
dental restoration materials" (Bowen col. 2, ll. 55-60).
[17] The refractive index of composite resin polymers is said to be
"commonly about nD 1.55, although higher and lower values are
sometimes encountered" (Bowen col. 1, ll. 54-60).
5
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: September 9, 2013