PubMed · 297634
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K Kimmel. 1979. [Instrument sets for crown stump preparation].. https://pubmed.ncbi.nlm.nih.gov/297634/
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Recent studies have described microleakage under full crowns cemented with several different cements. This study tested three different types of crown margin preparations--a chamfer, a shoulder, and a shoulder plus a bevel to determine whether or not the margin preparation could affect microleakage. All crowns were cemented with zinc phosphate cement. The crowns were tested for leakage in thermocycled dye. All crowns demonstrated significant leakage following the path of the dentinal tubules into the pulp. This could possibly be one of the causes of pulpal inflammation and even pulpal death under full crowns.
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The translucence of all-porcelain restorative materials very closely resembles that of natural teeth, thereby enabling the nearest possible emulation of natural teeth. Because of this quality and the suitability for bonding, all-porcelain has become the choice material for anterior jackets, three quarters, and veneers. In this article, the author uses actual cases to substantiate and illustrate her evaluation.