Investigation into the Effects of Sprue Attachment Design on Porosity andCastability

摘要

Many variables are involved in the process of fabricating a dense dental castingwhich accurately duplicates the wax pattern. The type of sprue design that is utilized has been shown to play a important role in the casing process. The literature is filed with conflicting results and conclusions regarding proper sprue attachment design. The objective of this investigation was to evaluate the effects of four different sprue attachment designs (Gradual Constriction, Abrupt Constriction, Flared, and Straight) on the porosity and castability of three different dental casting alloys: Firmailay, a Type II gold alloy; Jel-5, a palladium-silver alloy; and Rexillium III, a base-metal alloy. (js)