Comparison of reverse torque in different types of implant screw systems

Abstract

The aim of this study is to compare the torque loss values of two different implant internal thread systems after tightening-loosening cycles. A total of 30 dental implant, including two different internal thread design and three different brands were used in our study (Straumann, n:10 , Bego, n:10 , BioHorizons, n:10), (Straumann and Bego : conventional internal thread system, and BioHorizons : Spiralock® internal thread system). A digital torque measurement device was used in assessing the insertion and reverse torque values. The each group were tightened at the digital torque gauge showed 30 N/cm2, and loosened 20 times in total. The minimum torque loss value was observed in Straumann (1.49 N/cm2), and the maximum torque loss value was observed in Bego (3.58 N/cm2) during the first 10 cycles. No statistically significant difference was found between the groups. The effect of implant thread design on reverse torque was not statistically significant, but it should be kept in mind that decrease in reverse torque value depending on number of uses was observed in clinical use. © 2020 University of Dicle.