Abstract
This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 106 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (p<0.05). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (p<0.05) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.
Highlights
The advancement of knowledge of biocompatibility and surface design of implants, biomechanics, surgical technique and bone physiology changed the profile of rehabilitation with dental implants
The aim of this study was to evaluate the effect of mechanical cycling on retaining screw torque in platform switching (PS), regular platform (RP) and wide platform (WP) connections in external hexagon implants
This study investigated the effect of mechanical cycling on retaining screw torque in platform switching, regular platform and wide platform connections
Summary
The advancement of knowledge of biocompatibility and surface design of implants, biomechanics, surgical technique and bone physiology changed the profile of rehabilitation with dental implants. The implant-supported single prostheses with external hexagon connections undergo a variety of stresses due to the complexity of masticatory kinematics. Given this situation, in single rehabilitations, the possibility of loosening the prosthesis retaining screw is higher when compared with splinted prostheses [1]. Loosening generates instability at implant-abutment connection system, favoring the periimplant inflammation associated with marginal bone loss at the implant [5,6,7]. Few studies have analyzed stresses in prosthetic components [13] and such stresses can cause screw loosening or fracture, which is often observed in conventional implant supported prostheses [1,14]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
