Multi-Piece Post-Crown for Multi-Rooted Teeth with Non-Parallel Canals: A Direct Pattern Technique

Abstract

Problems associated with custom cast posts for multi-rooted teeth with nonparallel canals following the traditional direct pattern technique result from using different metals in fabricating post core systems include failures due to electrolytic action of dissimilar metals and unfavorable effect upon the physical properties of wrought metal posts. The preheating temperature of the investment mold may lead to recrystalization of the wrought metal post. This article describes a technique, for constructing custom-cast post-core system for the multirooted teeth with nonparallel canals, to address these problems. The technique is simple, accurate, reproducible, and eliminates the drawbacks of the traditional direct postcore pattern for multirooted teeth with non-parallel canals.