Abstract
ObjectivesTo evaluate histomorphometrically the healing at implants installed with standard or very low insertion torque valuesMaterial and methodsTwelve volunteer patients were recruited, and two screw-shaped titanium devices were installed in the distal segments of the mandible using insertion torque values of either < 10 Ncm or ~ 30 Ncm. The implants were left to heal in a non-submerged fashion. After 8 weeks, biopsies were retrieved, and ground sections were prepared for histological evaluation.ResultsHistological slides from 11 patients were available for (n = 11). The new bone in contact with the implant surface was 39.3 ± 18.5% and 49.4 ± 9.4% at the < 10 and ~ 30 Ncm sites, respectively. Considering the pre-existing old bone, the total mineralized bone was 46.8 ± 22.1% at the < 10 Ncm sites and 57.0 ± 14.1% at the ~ 30 Ncm. No statistically significant differences were found.New bone density and total mineralized bone density were 36.6 ± 8.1% and 53.0 ± 13.5% at the < 10 Ncm sites and 35.9 ± 10.0% and 52.2 ± 16.0% at the ~ 30 Ncm sites, respectively. No statistically significant differences were disclosed.ConclusionFrom the data of the present study, it can be concluded that a trend of higher osseointegration was observed at the ~ 30 Ncm compared to the < 10 Ncm torque group. Nevertheless, it can be concluded that an implant installed with a very low torque may achieve a good integration.Trial registrationClinicalTrials.gov NCT04017156; trial retrospectively registered on 12 July 2019.
Highlights
Very high insertion torque values have been recommended when immediate loading is applied to implants [1]
It has been shown that similar clinical outcomes may be achieved even with insertion torque values ≤ 15 Ncm when implants are splinted together [2]
A systematic review with meta-analyses summarized data from both animal and human studies and two groups were identified based on the insertion toque values: > 25 Ncm or < 30 Ncm [13]
Summary
Very high insertion torque values have been recommended when immediate loading is applied to implants [1]. It has been shown that similar clinical outcomes may be achieved even with insertion torque values ≤ 15 Ncm when implants are splinted together [2]. In a consensus conference, insertion torque values comprised between 20 and 45 Ncm were. Different insertion torque values have been tested both in human [7,8,9] and in animals studies [1, 4,5,6, 10,11,12]. A systematic review with meta-analyses summarized data from both animal and human studies and two groups were identified based on the insertion toque values: > 25 Ncm or < 30 Ncm [13].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
