Effects of differentangles of abutment screwchannel on removal torquevalue of ball torx screws

Aim: This study investigates the impact of various tightening protocols on torque requirements in screw-retained crowns, focusing on the Angulated Screw Channel (ASC) system. The ASC alters the screw channel angle in the crown while aligning the abutment with the implant, potentially enhancing function and aesthetics in cases of improper implant positioning. Methods: The investigation involved three sample groups: DIO abutment with 0-degree screw access and regular screw (D0), Ti-base angled screw channel abutment with 0-degree access and ball torx screw (A0), and Ti-base with 20-degree access and ball torx screw (A20). Each group was subdivided into four protocol categories, using nine screws each. Screws were initially hand-tightened, then subjected to the respective tightening protocols, with torque measurements taken using a calibrated Digital Torque Meter. Results: Significant statistical differences in torque requirements were observed between the D0 group and both the A0 and A20 groups. However, the torque reduction percentage did not vary significantly among the different tightening protocols or between the 0- and 20-degree angles in the ASC system. The results indicate notable distinctions in torque needs between standard and angled screw channel systems. The lack of significant variance in tightening protocols and angles within the ASC system suggests consistency in torque requirements, regardless of these factors. Conclusions: While the ASC system demonstrates a significant difference in torque requirements compared to the traditional system, the angle of the screw channel and the tightening protocol do not substantially affect torque reduction in the ASC system.