Implant insertion torque value in immediate loading: A retrospective study.

R Del Giudice,M Petrini,Nm Grande,A Crispino,A Piattelli,E Cataneo

doi:10.4317/medoral.22845

Abstract

BackgroundThe aim of this study is to verify if the Insertion Torque Value (ITV) of 32 Ncm for immediate loading protocol (ILP), as indicated by literature, is still, with the advance in implant research, a real significant cut-off for long-term implant survival.Material and MethodsIn this retrospective study, data from 224 patients that during three years of clinical practice, were submitted to the insertion of 322 implants with immediate loading protocol, have been recorded, pooled and analyzed. Data were organized based on Insertion Torque Value (ITV): > 32 Ncm (CG) and < 32 Ncm (LTG) and two different groups of equal sample size, 161 implants each, were distinguished. Crestal bone reabsorption, and the implant failure rate were evaluated after 2-years of follow-up.ResultsThe bone reabsorption in LTG (0.49 ± 0.11 mm) was significantly greater than CG (0.22 ± 0.04 mm), p<0.001. However, the survival rate after 2-years of follow-up was quite high and similar for both groups: 96.89% for LTG and 97.52% for CG and no statistically significant differences have been found among the two groups for the implant failure rate (p=0.455). The Odds Ratio (OR) of implant failure was of 1.258 (95% CI 0.332, 4.772), but results were not statistical significant, p=0.740.ConclusionsThe present study showed that although implants with ITV> 32 Ncm are still characterized by a lower crestal bone resorption, there are no statistically significant differences among the two groups for what concerning the failure rate during the 2 years of follow-up and OR. These results permit us to suppose that the cut-off of ITV >32 Ncm for immediate loading implants, could be reduced to inferior values. However further studies are necessary to indicate precise clinical guidelines. Key words:Immediate loading, insertion torque, primary stability, dental implants, implant survival.

Highlights

A good primary stability and a direct interface between the implant surface and the alveolar bone during the healing process is fundamental for osteointegration [1]
Background: The aim of this study is to verify if the Insertion Torque Value (ITV) of 32 Ncm for immediate loading protocol (ILP), as indicated by literature, is still, with the advance in implant research, a real significant cut-off for long-term implant survival
It is important to highlight that implants that failed in in the LTG group, supported both partial prosthesis (3 implants) than single-tooth restorations (2 implants), (Table 3, Fig. 2); on the contrary, those that failed in the CG groups, (4 implants) supported all single-tooth restorations (Table 4, Fig. 2); this result is very important, because there were statistically significant differences for what concerning the prosthetic rehabilitations of the failed implants in the 2 groups, p

Summary

Introduction

A good primary stability and a direct interface between the implant surface and the alveolar bone during the healing process is fundamental for osteointegration [1]. Conclusions: The present study showed that implants with ITV> 32 Ncm are still characterized by a lower crestal bone resorption, there are no statistically significant differences among the two groups for what concerning the failure rate during the 2 years of follow-up and OR. These results permit us to suppose that the cut-off of ITV >32 Ncm for immediate loading implants, could be reduced to inferior values. Further studies are necessary to indicate precise clinical guidelines

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Conclusion