Influence of implant macro-designs on primary and secondary implant stability
Keywords:
dental implants, bone, jaw, maxilla.Abstract
Aim: to analyze the influence of the implant macro design in the primary and secondary stability by means of analysis of resonance frequency and force of insertion.
Methods: 38 Screw Type and Tapered Type implants were placed in 18 patients in the Bucomaxillofacial Implantology program of the University of Chile during 2006 and 2007 in type II or III bone jaws according to Leckholm and Zarb. Implant stability, implant stability coefficient (ISQ), was measured through Ostell® mentor at the time of installation (ISQ1) and then at connection (ISQ2) and the Insertion Torque through the Osseoset® machine: 17 Screw Type implants with an approximate average contact area of 237mm2 (3.75 / 15mm; 3.75 / 13mm) and 17 Tapered Type implants with an approximate average contact area of 226mm2 (4.3 / 13mm; 4.3 / 16mm).
Results: The averages of ISQ1 and ISQ2 and Insertion Torque respectively for implants with an approximate contact area of 237mm2 were 71.3 ISQ1, 66.6 ISQ2 and 44.52Ncm; for 226mm2 implants it was 75 ISQ1, 72.5 ISQ2 and 48.82Ncm.
Conclusion: Implants with an average contact area of approximately 226mm2 (Tapered Type) present significantly higher primary and secondary stability than those with an average contact area of approximately 237mm2 (Screw Type). (Average ISQ1: p = 0.0473; Insertion Torque: p = 0.0031 and Average ISQ2: p = 0.0039).
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