An In Vitro Study of Torque Application in Abutment Screw Tightening at the Implant-Abutment Junction in Simulated Osseointegrated Implants.

Authors

Jan C Kwan

Published in

The International journal of oral & maxillofacial implants. Volume 0. Issue 0. Pages 1-27. Mar 17, 2025. Epub Mar 17, 2025.

Abstract

To evaluate initial and removal torque values (ITV and RTV) in abutment screw tightening and their impact on torque application at the implant-abutment junction (IAJ), utilizing a biomechanical friction resistance model simulating various bone densities, with and without counter-torquing measures.
Sixty implant-abutment assemblies were divided into three groups, each simulating different levels of frictional resistance. The endpoint for abutment screw tightening were either reaching a preset torque value of 35 Ncm or detecting a change in the implant's angular position. ITV, RTV, and changes in angular position were recorded. One-way ANOVA with Tukey post hoc were used.
For all frictional resistance groups, abutment screws tightened with a counter-torquing device attained 35 Ncm (p> 0.05). Abutment screws tightened without a counter torquing device in low and medium frictional resistances were unable to attain 35 Ncm prior to implant rotation. ITVs of abutment screws without counter-torque were not significantly different in the medium and high frictional resistance groups (p > 0.05), except in the low frictional resistance group (p < 0.001). No significant difference in the change in implant angular displacement for all groups (p > 0.05) regardless of counter-torquing measures; however, a high variance was observed in the low and medium frictional resistance groups.
Under the experimental conditions, counter-torque is important to ensure the desired torque value is applied to the implant-abutment connection in low frictional resistance. RTV is proportionally related to ITV and can be used to estimate the ITV at the IAJ.

PMID:
40096516
Bibliographic data and abstract were imported from PubMed on 18 Mar 2025.

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