Evaluation The Effect of High Insertion Torques of Implants On Crestal Bone Absorption in the posterior mandible

Abstract

Background: The healing of bone around the implant involves a series of cellular and extracellular life events that play a role on the surface of the implant until it is covered by the new formed bone. The primary stability of the implants is related to the insertion torque during the placement of the implants. Several studies have shown that high insertion torques may cause micro-fractures with some absorption in the cortical region and consequently a delayed healing process. Also, there are several in vitro studies that showed that the high insertion torque did not cause any bone necrosis or crestal bone resorption around the implants.

Aim: Evaluation the effect of high insertion torques of implants on crestal bone absorption in the posterior mandible.

Materials and Methods: The sample consisted of 20 implants divided into 2 groups, group A included 10 implants of high torque (>50 N/cm) and group B included 10 implants of low torque (25-35 N/cm), implant type is (Megagen, anyone), bone height was assessed radially and was evaluated immediately before and after implantation and after 6 months using cone beam computed tomography to assess the crestal bone (medial-lateral) resorption around the implant.

Results: The significance level is much smaller than the value 0.05, meaning that at the 95% confidence level there are statistically significant differences in the average values ​​of the amount of bone absorption (in mm) between the two study groups, and we concluded that the amount of bone absorption (in mm) In the group of implants with high insertion torque, it was greater than in the group of implants with low insertion torque.

Conclusion: The high insertion torque causes higher absorption in crestal bone compared with low insertion torque of implants in the posterior mandible.