Evaluation of increased primary stability in dental implants with change in instrumentation through the integration of torque and resonance frequency analysis
DOI:
https://doi.org/10.11606/issn.2357-8041.clrd.2018.144770Abstract
Introduction: The discovery of osseointegration has set a milestone as rehabilitative therapy in dentistry, allowing for countless alternatives. Objective: The aim of this study was to evaluate an alternative technique of implant that provides a better primary stability. Materials and methods: fresh pork ribs were selected for the installation of 60 cylindrical machined implants divided into three groups. Prior to installation of the implants, bone density was measured in Hounsfield unit with conventional computed tomography. The values of bone density were measured in the position of the implants and were correlated with the insertion torque and resonance frequency analysis. In the control group, we used the installation technique in which the last drill used has 3.0 mm, as recommended by the manufacturer, whereas in group 2 and 3 an alternative technique for sub-instrumentation and super-instrumentation was used, in which the last drill used to prepare the surgical bed had 2.8 mm and 3.15 mm, respectively. The values of maximum insertion torque at the time of implant placement were recorded, and the values of resonance frequency were measured from the ratio of implant stability (ISQ). Results: An increase of 63.1219% was observed in the insertion torque when using the 2.8 mm as final drill, and a negative torque of insertion with -4071% was obtained using the 3.15 mm drill as final drill when compared with the control group. A correlation between primary stability was verified, achieved by the average insertion torque and the diameter of the preparation of the bed receiving the implant using the cylindrical implant. Conclusion: These results indicate that by using this alternative technique for sub-instrumentation, the surgeon can reach higher values of insertion torque even at low bone density, enabling a better primary stability, suitable for the immediate loading technique. DESCRIPTORS | Immediate Load; Torque; Osseointegration; Dental Implant.
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