Abstract
Effect of Abutment Connection Type and Cyclic Loading on Removal Torque Value
Highlights
Maintaining the primary torque of the abutment screw is a common problem related to implant-supported restorations; a failure in this respect often leads to screw loosening
The highest removal torque value (RTV) belonged to the internal connection abutment without cyclic loading (22 Newton-centimeter (Ncm)), while the lowest RTV was noted with the external connection abutment subjected to cyclic loading (14 Ncm; P
The maximum RTV was noted in the internal connection group without cyclic loading (22 Ncm), and the minimum RTV was noted in the external connection group with cyclic loading (14 Ncm)
Summary
Maintaining the primary torque of the abutment screw is a common problem related to implant-supported restorations; a failure in this respect often leads to screw loosening. On the other hand, loosening or fracture of abutment screws can pose serious complications as the overlying restoration must be removed to access the screw. During this process, the cemented implant restoration may be damaged or completely destructed. Maintaining the primary torque of the abutment screw is a Received: Nov 2018 common problem related to implant-supported restorations; a failure in this respect. Corresponding author: Prosthodontics Dept, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran , Hashemi.prostho@ gmail.com connection types with and without cyclic loading on removal torque value (RTV). Two-way analysis of variance (ANOVA) was used to assess the effect of the abutment system and cyclic loading on RTV
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