Influence of an Alternative Implant Design and Surgical Protocol on Primary Stability

摘要

The purpose of this in vitro study was to evaluate the influence of a new proposal of implant design and surgical protocol on primary stability in different bone densities. Four groups were tested (n=9): G1 - tapered, cone morse, ? 4.3 mm x 10 mm in length (Alvim CM); G2 - experimental tapered; G3 - cylindrical, cone morse, ? 4.0 mm x 11 mm in length (Titamax CM) and G4 - experimental cylindrical. The experimental implants were obtained from a design change in the respective commercial models. The insertion was performed in polyurethane (PU) blocks 0.24 g/cm 3 (20 pcf) and 0.64 g/cm 3 (40 pcf), according to different surgical protocols. The primary stability was measured by means of insertion torque (IT) and pullout test. Data were analyzed by ANOVA, Tukey’s test (α=0.05) and Pearson’s correlation. For IT and pullout, conventional and experimental implants showed no difference between them when inserted in the 20 pcf PU (p0.05). In the 40 pcf PU, the modified implants exhibited greater IT (p0.05) and lower pullout (p0.05) compared to the respective conventional models. The implant design tested associated with the surgical protocol, positively influenced primary stability in higher density bones.