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Volume 28 , Issue 2
March/April 2013

Pages e98–e105

Distribution of Peri-implant Stresses with a Countertorque Device

Claudio Luiz Sendyk, PhD/Thais Torralbo Lopez, MSc/Cleudmar Amaral de Araujo, PhD/Wilson Roberto Sendyk, PhD/Valdir Ferreira Goncalvez, MSc

PMID: 23527374
DOI: 10.11607/jomi.2506

Purpose: To verify the effectiveness of a countertorque device in dental implants in redistributing stress to the bone-implant interface during tightening of the abutment screw. Materials and Methods: Two prismatic photoelastic samples containing implants were made, one with a 3.75-mm-diameter implant and the other with a 5.0-mm-diameter implant (both implants had an external-hexagon interface) and the respective abutments were attached (CeraOne). The samples were placed in a support and submitted to torques of 10, 20, 32, and 45 Ncm with an electronic torque meter. The torque application was repeated 10 times on each sample (n = 10) with and without a countertorque device. Photoelastic patterns were detected; thus, a photographic register of each test was selected. The fringe patterns were analyzed at discrete points near the implants’ external arch. Results: In both implants analyzed, a stress gradient reduction was observed through the implant with the countertorque device. Conclusions: The countertorque device used in this study proved to be effective in reducing the stresses generated in the peri-implant bone tissue during torque application. Int J Oral Maxillofac Implants 2013;28:e98–e105. doi: 10.11607/jomi.2506

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