Statement Of Problem: The best treatment for a crown that has come loose but has appropriate marginal fit and form is not clear.
Purpose: This study was designed to determine whether the retention of such crowns can be increased without remaking the crown or by extensively modifying the tooth preparation.
Material And Methods: Ninety cast metal complete crowns, divided into 9 groups of 10, were fabricated to be slightly loose in their internal adaptation to metal dies with an optimal tooth preparation.
Objective: The purpose of this study was to examine the hydration of a high-alkali dental porcelain (Ducera LFC) and its relative abrasive wear against human enamel. The hypothesis is that the composition of the porcelain (LFC) will form a softer, hydrated layer in artificial saliva, which will reduce wear against enamel relative to other dental porcelains.
Method And Materials: The first experiment was to estimate the thickness of the hydrated layer formed on LFC by storage in artificial saliva using microindentation hardness.