The purpose of this study is to evaluate the color differences in the In-Ceram according to coping thickness and various abutment core materials : amalgam, precious alloy, composite resin, non-precious alloy.
After the porcelain was built up on the In-Ceram coping at the thickness of 0.3mm and 0.5mm then it was cemented with glass ionomer cement to the post & core materials. The color was measured with a spectrophotometer.
@ES The following results were obtained.
@EN 1. There were significant difference in the L* values a * and b* values in the cementation of different cores. To the In-Ceram(P<0.01). L* values were not significantly different between the composite resin to the In-Ceram and the a*, b*
values
were
not significantly different between the amalgam and the non-precious alloy.
2. All of cementations of In-Ceram to the core materials had color difference (△E* ab) compared to the In-Ceram. In the 0.3mm thickness of the In-Ceram copping non-precious alloy indicated the greatest value, while the composite resin core
showed
the
lowest value with a thickness of 0.5mm In-Ceram copping.
3. By controlling the In-Ceram coping thickness L* value was significantly difference(P<0.01), but not in a* and b* values.
4. In an amalgam, precious & non-precious alloys there was a 1.74 to 3.06 range color difference in the controlled thickness of In-Ceram coping at the thickness of 0.3mm and 0.5mm.
The above results suggest that the requirement of the sufficient thickness of In-Ceram coping and the suitable core material in order to get an esthetic restoration by In-Ceram coping and the suitalbe core material in order to get an esthetic
restoration by In-Ceram and also to intercept the original core color.
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