Analysis by Microscopy Techniques of Metal-Ceramic Dental Restorations with Ni-Cr Support

摘要

Dental biomaterials are designed to improve oral health by replacing the missing maxillary structures. The prosthesis partial edentulous restorations are widely used as metal-ceramic fixed prostheses having metal support from Ni-Cr or Co-Cr alloys. We have conducted metallographic studies on Ni-Cr alloy samples of metal-ceramic biomaterial commonly used in dentistry, in two characteristic zones: the metallic body and the metal-ceramic interface. Optical microscopy examination revealed precipitates of intermetallic compounds both in grain boundaries and interdendritic. The examination of the metal-ceramic interface did not revealed separations or cracks, but relatively uniformly distributed pores, resulting from the burning of opaque zone were detected.