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- Title
Surface Roughness and Flexural Strength of Self-Glazed, Polished, and Reglazed In-Ceram/Vitadur Alpha Porcelain Laminates.
- Authors
Chu, Frederick C. S.; Frankel, Nicholas; Smales, Roger J.
- Abstract
Purpose: Because of existing controversy, the present study investigated 3 methods for reducing surface roughness and improving the strength of porcelain restorations. Materials and Methods: Ninety laminated In-Ceram/Vitadur Alpha self-glazed porcelain disks were fabricated and randomly divided into 3 groups (n = 30 each). Group 1 consisted of 30 of the original disks. The remaining 60 disks were then polished by 6 operators according to the recommendations of the American Academy of Esthetic Dentistry; group 2 consisted of 30 of these polished disks. The remaining 30 polished disks were reglazed (group 3). Average roughness values (Ra) of the veneers were measured by a profilometer. In each group, 20 disks were subjected to a flexure test, with 10 of the In-Ceram cores and 10 of the Vitadur Alpha veneers placed in tension. Results: The Ra values were 0.5 ± 0.1 µm, 0.7 ± 0.3 µm, and 0.4 ± 0.1 µm for groups 1 to 3, respectively. Following one-way analysis of variance (ANOVA), Bonferroni's multiple comparison tests found that groups 1 and 3 were significantly smoother than the polished group ( P< 0.001). Reglazed disks were also significantly smoother than the original self-glazed disks ( P< 0.01). With the veneers in tension, the flexural strengths were 151 ± 22 MPa, 118 ± 22 MPa, and 172 ± 27 MPa for groups 1 to 3, respectively. Following one-way ANOVA, Bonferroni's multiple comparison tests found that groups 1 and 3 were similar and were significantly stronger than the polished samples ( P< 0.05 and P< 0.001). Conclusion: Reglazing polished porcelain surfaces significantly improved the surface texture and flexural strength of the materials tested.
- Publication
International Journal of Prosthodontics, 2000, Vol 13, Issue 1, p66
- ISSN
0893-2174
- Publication type
Academic Journal