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The International Journal of Oral & Maxillofacial Implants
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Int J Oral Maxillofac Implants 28 (2013), No. 2     15. Mar. 2013
Int J Oral Maxillofac Implants 28 (2013), No. 2  (15.03.2013)

Online Article, Page 462, doi:10.11607/jomi.2506, PubMed:23527374


Online Article: Distribution of Peri-implant Stresses with a Countertorque Device
Sendyk, Claudio Luiz / Lopez, Thais Torralbo / Araujo, Cleudmar Amaral de / Sendyk, Wilson Roberto / Goncalvez, Valdir Ferreira
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.