Appeal 2007-2566
Application 10/243,873
radiation necessary for activating the adhesives (Specification 2:11 to
3:2).
[4] Appellants' dental pin is said to be mechanically strong, opaque to X-
rays and transparent to light radiation used to activate a
photopolymerizable adhesive (Specification 3:6-11).
[5] Appellants' dental pin is made of a composite comprising fibers
embedded in a resin matrix, wherein the fibers are radio-opaque and
the refractive index of the matrix resin is close to the refractive index
of the fibers (Specification 3:12-16).
[6] Preferably, the refractive indices of the fibers and of the resin differ
within 0.15 (Specification 11-12, original claim 5).
[7] If the refractive index of the resin is too low vis-à-vis that of the
fibers, fillers such as amorphous silica or metal oxides may be added
to the resin (Specification 3:19 - 4:3).
[8] If the refractive index of the resin is too high vis-à-vis that of the
fibers, the resin may be diluted in a solvent (Specification 4:3-5).
[9] Alternatively, two different resins, preferably differing by more than
0.15 in their refractive indices, may be mixed to obtain a desired
intermediate refractive index (Specification 4:6-13).
[10] Example 1 is said to describe a dental pin made from (i) 64 % by
volume alkaline resistant synthetic fibers containing 16% radio-
opaque zirconium dioxide and having a refractive index of 1.562 and
(ii) 36 % by volume modified epoxy resin matrix having a refractive
index of 1.546 (Specification 5:6-20).
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Last modified: September 9, 2013