Comparison of Primary Stability of Two Different Implants DesignsA Prospective Clinical Study

Introduction: Any implant treatment must begin with successful implant integration. The effectiveness of implant osseointegration is determined by various factors, including implant design, implant diameter and density, and surgical technique. Osseointegration is dependent on implant design.

Aim: To assess the primary stability of tapered and cylindrical implants by using Resonance Frequency Analysis (RFA) and Insertion Torque Values (ITV).

Materials and Methods: This in-vivo, prospective clinical study was conducted in the Department of Prosthodontics at Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India in the month of November 2019. Twenty patients were selected for the study. Tapered Bioline implants (Bioline Dental GmbH & Co. KG-Germany) were spaced in 10 patients (group 1) and cylindrical Bioline implants (Bioline Dental GmbH & Co. KG-Germany) in the other 10 patients (group 2). For both implant designs, primary stability was assessed immediately after implant placement using RFA by Osstell Mentor and ITV by a torque wrench. Kolmogorov-Smirnov test, Shapiro-Wilk test were used for checking normality. Mann Whitney U test, Independent t-tests, Spearman correlation tests were done by using software Statistical Package for Social Sciences (SPSS) Version 23.0.

Results: The mean ISQ (Implant Stability Quotient) for tapered implants was 76.6±2.3, and for cylindrical implants mean ISQ was 59.75±4.2 (p-value <0.001). The mean ITV for tapered implants was 43±2.58 Ncm, and for cylindrical implants, the mean ITV was 33±4.21 Ncm (p-value <0.001). The correlation between ITV and RFA was 0.928 which was highly significant (p<0.001**).

Conclusion: Within the scope of this investigation, tapered implants showed better primary stability than cylindrical-shaped implants as determined by ISQ and insertion torque values. ITV and ISQ values showed a positive correlation in determining the primary stability of implants.