Evaluation of the effect among different surface polish on the flexural strength of dental ceramics

PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 1996 (Pediatric Dentistry).Includes bibliographical references (leaves 83-86).The effects of surface finish on flexural strength and surface roughness of a feldspathic porcelain (Vita Omega), aluminous porcelain (Vita AIpha) and a computer aided design-computer aided manufacture porcelain (Vita MKII) were examined. Testing bars were fabricated by conventional technique for Vita Alpha &Vita Omega groups. MKII specimens were obtained by sectioning from a manufacturer's prefabricated block. Vita Alpha & MKII had 5 surface treatment groups and Vita Omega had an additional 4 groups. The groups consisted of self-glaze, Shofu polish, overglaze, Perladia polish, and Buehler polish. The additional groups consist of Buehler combined with Shofu and Perladia; overglaze combined with Shofu and Perladia. All groups were subjected for surface roughness evaluation with the aid of S.E.M. and profilometric analysis. Overglaze significantly increased (p[less than].05) flexural strength (three-point-bending) and had the smoothest surface of all three ceramic materials. Self-glaze, Shofu, Perladia and Buehler had no statistical difference in flexural strength among Vita Alpha and Vita Omega groups