Comparative evaluation of influence of ceramic firing on internal fit and marginal adaptation of single metal ceramic crown restoration fabricated by conventional casting and direct metal laser sintering method: an in vivo study

Abstract

Metal ceramic restoration is the most widely selected material for production of complete coverage restoration and fixed dental prosthesis. For of fixed prosthodontics, internal gap and marginal gap are two of the most crucial factors for determining the long-term prognosis of a prosthesis. The fit of metal ceramic restoration not only depends on the precision of the production method but also on the subsequent fabrication procedures such as firing process. Nowadays the new digital systems are being commonly used for fabrication of metal ceramic crown to overcome the constraints with conventional casting technique. The effect of ceramic firing on clinical marginal and internal fit of restorations fabricated by laser sintering method is unknown. PURPOSE The purpose of this study was to evaluate and compare the effect of ceramic firing on the Clinical Internal fit and Marginal adaptation of metal coping fabricated by Direct Metal Laser Sintering method, with that of metal coping prepared by Conventional Casting method.