Abstract
Introduction
The aim was to systematically evaluate the effect of low insertion torque values on the survival rate of immediately loaded dental implants.
Methods
The protocol was registered (PROSPERO ID CRD42020189499), with an electronic search performed in the PubMed, Embase, Web of Science and Cochrane Central Register of Controlled Trials until June 2022 in English and Spanish. Studies analysing the failure or survival rate of immediately loaded dental implants according to different insertion torque values were included.
Results
Five hundred seventy-three articles were assessed of eligibility, of which 7 articles, 4 randomised clinical trials (RTCs), 1 controlled clinical trial and 2 prospective case series studies, were included in the qualitative analysis. The RCTs were classified as low risk of bias, and the non-RCTs as moderate and serious risk of bias. The mean survival rate for implants with low insertion toque (≤35 Ncm) was 96% (p>0.001, 95% CI: 0.91–0.98), and that for implants with medium or high insertion torque (>35 Ncm) was 92% (p>0.001, 95% CI: 0.86–0.96) (IRR = 1.05, 95% CI: 0.79–1.39, p=0.175, I2=0.0%). Splinted implants with insertion torque >20 Ncm and single implants with insertion torque >35 Ncm had a higher survival rate than implants with lower insertion torque values (IRR = 1.05, 95% CI: 0.78–1.43, p=0.956, I2=0.0%, and IRR = 0.92, 95% CI: 0.48–1.75, p=0.799, I2=0.0%, respectively). Different in sertion torque values achieved equivalent outcomes. The mean follow-up was 24 months.
Conclusion
Low insertion torque values have no significant effect on survival rates of immediate loading implants at a mean follow-up of 24 months.
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