Aim of the study: Comparing the impact of two different implant macro-designs on the primary stability.
Material and methods: Patients received implants in the lower posterior jaw (bone type II and III). Two different macro-design implants were inserted randomly in accordance with a conventional drilling protocol, the first one is the hybrid self-tapping implant: Straumann® bone level BL and the second one is tapered self-tapping implant: Straumann® bone level tapered BLT.
16 implants (3.3 and 4.1 mm diameter, length between 8 and 10 mm) of each of the two above-mentioned implants were used. The assessment of the primary stability of each implant design was carried out by using two methods, recording the maximum insertion torque IT (DTA device) and recording the implant stability quotient ISQ using the resonance frequency analysis RFA (with the Osstell device).
Results: Within the limitation of the present study, in all bone types, BLT implants showed significantly higher mean insertion torque IT when compared to BL with respectively 46.67±6.85 Ncm for BLT implants and 35.77±6.72 Ncm for BL implants (p=0.01 as per the Anova test), and higher mean ISQ with respectively 77.15±5.16 and 70.74±4.83. (p=0.01 as per the Anova test).
Conclusion: In type II and III bone, the tapered self-tapping implant (Straumann® BLT) statistically showed better primary stability when compared to hybrid self-tapping implant: Straumann® bone level BL. Within the limitations of the present study, it can be concluded that the implant Macro-Design might be considered as a reliable parameter to achieve acceptable primary stability of dental implants in areas with low bone density. In the present study, the two methods used to assess the primary stability of the different macro-designs, torque assessment and the resonance frequency analysis RFA, showed a weak correlation. The macro-geometry is basically made to satisfy the needs in some critical bone situations and in immediate loading protocol.
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