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Volume 23 , Issue 4
July/August 2010

Pages 350–352

The Effect of Framework Design on Fracture Resistance of Metal-Ceramic Implant-Supported Single Crowns

José Luiz G. de Oliveira, DDS, MSc/Leandro Moura Martins, DDS, MSc/Jefesson Sanada, DDS, MSc/Pedro Cesar G. de Oliveira, DDS, MSc, PhD/Accácio L. do Valle, DDS, MSc, PhD

PMID: 20617225

This study evaluated the effect of framework design on the fracture resistance of metal-ceramic implant-supported crowns. Screw-retained molar crowns with a screw access hole composed of metal or porcelain were compared to a cement-retained crown (control). For each group (n = 10), five crowns were subjected to dynamic loading (1,200,000 3 100 N 3 2 Hz at 37°C). Afterward, all specimens were loaded to failure using a universal testing machine. Significant differences could be established between the cement- and screw-retained groups (P ≤ .05), but no difference was found between the screw-retained groups and the specimens subjected to dynamic loading. Occlusal discontinuity of screw-retained crowns affects their resistance, and the metallic support on the screw access hole did not reinforce the crowns. Int J Prosthodont 2010;23:350–352.

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