Nowdays, many all ceramic crowns were developed. Among those the flexural strength of In-Ceram Alumina(450Mpa) have a greater than that of any other systems. But it have a rather greenish color and low translucence by the opaque alumina oxide
core
material. The In-Ceram Spinell offers the high flexural strength(350Mpa) and high translucence.
In this study the differences of reflective spectrum between alumina core and spinell core were investigated. The Vita Celay blanks(Alumina & Spinell) were sectioned into 3 types thickness(0.5mm, 1.0mm, 1.5mm). After glass infiltration the color
of
each
specimen.
@ES The results were as follows ;
@EN 1) The reflective rates of alumina cores were seen 42.19% at 500nm, increased to 50.39% at 55nm, decreased to 28.86% at 585nm, increased to 59.39% at 720nm. 2)The reflective rates of spinell cores wee seen 26.4% at 380nm, slowly incresed to
40.86%
at 720nm. 3)About the difference of thickness, alumina cores showed that the thicker of them, the higher of the reflective rate. But spinell cores showed that they did not influenced into the reflective rate. 4) About the effect of standard black
board
and white board, alumina cores were seen the difference between then more than 600nm. But spinell core were seen the different distribution curve between them.
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