Aflojamiento de tornillos de fijación a elementos transepiteliales en implantes Microdent

Abstract

Aim: To analyze the behavior of the fixation screws to transepithelial elements subjected to lateral forces, between implants with internal conical connection and internal hexagonal connection from Microdent. Methodology: In this experimental in vitro study, 20 implants attached to transepithelial elements were sampled, which were divided into two groups of 10 according to their connection: group A corresponded to the Microdent EK implant with internal hexagonal connection, platform diameter of 3.50 mm and length of 12 mm; group B corresponded to Microdent Genious, with internal conical connection, platform diameter of 3.50 mm and length of 12 mm. The screws of each group were subjected to a torque of 35 N, recommended by the manufacturer, and a cyclic machine was used. Each implant was induced to a compression bending force at 120 newton with 2550 repetitions and at the end counter torque was applied for each group using its torque wrench adjusted to the W&H Implantmed motor. Results: In the internal conical connection group the average and standard deviation in Nw was 33 (±35). In the internal hex connection group it was 17 (± 15) Nw, with statistical significance. Conclusions: The internal tapered connection group required a higher counter torque force to undergo loosening, with respect to the internal hex connection implant group, which establishes it to the internal tapered connection implant as a better option.