Authors : Amir Alireza Rasouli-Ghahroudi, Yadollah Soleimani Shayesteh, Nazanin Samiei and Samaneh Masoumi
Abstract: The aim of this study was to evaluate the primary stability of implants placed in D4 and D2 type bovine bones at different angles in vitro by using Resonance Frequency Analysis (RFA) and measuring Insertion Torque Value (ITV) and Reverse Torque Value (RTV) of implants. A total of 89 implants were placed in bone blocks harvested from bovine femur and tibia. The angualtion for placing implants were 0, 10, 20 and 30°. The bone densities of recipient sites were determined by density value as Houns eld Units (Hu) using cross-sectional CT scans based on Lekholm and Zarb classification and tactile sense of the surgeon based on Misch’s classification. Primary stability was measured by Osstell (ISQ), ITV by OsseoCare and RTV by TQ-8800 Torque Meter (N cmG1). One-way ANOVA was used to compare the ISQ, ITV and RTV at different angles and Spearman’s rho was employed to evaluate the relationship between Hu, angulation, bone density, tactile sense of the surgeon, ISQ, ITV and RTV. There was a statistically signi cant difference of ISQ value in D4 but not in D2 (p>0.05). No significant difference of ITV and RTV was found in D2 and D4 at defined angles. Moreover, Spearman’s rho test results showed a significant and direct relationship between ITV and ISQ; between ITV and RTV and between RTV and angulation in D2 and D4 type bones (p<0.05). In D4 type bone, angulation can increase the primary stability of the implant, so, to avoid resurgery, implants should be placed with an angle of 10° to improve its stability.
Amir Alireza Rasouli-Ghahroudi, Yadollah Soleimani Shayesteh, Nazanin Samiei and Samaneh Masoumi, 2020. In Vitro Evaluation of the Primary Stability of Implants Placed at Different Angles in D2 and D4 Bovine Bones. Research Journal of Biological Sciences, 15: 80-88.