Dental Publication / Article Details |
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Quest for the All Ceramic Restoration
Author(s):
Ronald Goldstein, DDS;David Garber, DMD;Henry Salama, DMD;Pinhas Adar, MDT, CDT
Date Added:
1/1/2000
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Summary:
The all-ceramic, full-coverage restoration has long been the center of the profession's ardent quest for the consummate esthetic restoration. Over the years, we have come to acknowledge the optimal esthetics of the all-porcelain crown, but its tendency to fracture over time rendered it an "alternative" restoration for specifically selected cases when compared to the "workhorse" of porcelain-fused-to-metal restorations. The initial dental feldspathic porcelains exhibited low shear strength with a definitive brittleness that readily fractured during function and poor marginal fidelity due to the poorly controlled sintering shrinkage. Early changes in composition tried to reinforce this material, utilizing a luminous materials and other additives such as leucite. While this still proved to be inadequate, an advantage from the addition of these products, particularly leucite, was to raise the coefficients of thermal expansion and the melting points to facilitate the bonding of the ceramic to a reinforced metal substructure. However, the all-ceramic restoration still provided vastly superior esthetic results due to its optical properties, beyond the inherent color of the ceramic, and compensation had to be made for the lack of light transmission and refraction over the stronger but opaque metal core.
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