Evaluation Of The Effectiveness of High Insertion Torques on Implant Stability Quotient (ISQ) and Marginal Bone Loss of Implants in Posterior Mandible

Background: Implant stability is an indicator of the osseointegration of dental implants, as it affects the healing process and success of osseointegration and it is usually related to the insertion torque during implant placement. As a matter of concern, implants inserted with torques greater than 50 N/cm can cause excessive pressure on the surrounding bone with temporary local bone necrosis. Aim: Comparison the effect between high and low insertion torques on implants stability quotient and marginal bone loss of implants in posterior mandible. Methods: Twenty implants were inserted in 10 patients. Implants were divided into two groups according to high insertion torque (Group A) and low insertion torque (Group B). ISQ was measured by ostell device and the marginal bone loss was measured by CBCT. Results: P.value was much lower than the value 0.05 after six months of implantation in the (Group A) according to the thickness of the vestibular plates (in mm). also, the values of (ISQ) immediately after implantation and after 6 months in the (Group A) were greater than in the (Group B). Conclusion: High insertion torque(above 50 N/cm) leads a higher Implant Stability Quotient(ISQ) immediately after implantation and after 6 months, compared with low IT (25-35 N/cm), and leads to higher buccal bone plate loss after 6 months compared with low IT.