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Volume 21 , Issue 4
July/August 2006
Pages 560–566

Primary Stability of a Conical Implant and a Hybrid, Cylindric Screw-Type Implant In Vitro

Jun Sakoh, Dr Med Dent / Ulrich Wahlmann, PD, Dr Med, Dr Med Dent / Elmar Stender, Dr Rer Nat / Bilal Al-Nawas, PD, Dr Med, Dr Med Dent / Wilfried Wagner, Univ-Prof, Dr Med, Dr Med Dent

PMID: 16955606

Purpose: The differences with respect to primary stability between 2 Camlog implants, a conical implant, and a hybrid cylindric screw-type implant, were investigated in vitro. The effect of under-dimensioned implant bed preparation was also studied for both implant designs. Materials and Methods: In an in vitro model the stability of different implants in fresh porcine iliac bone blocks was measured using torque moment values, the Periotest, resonance frequency analysis, and push-out testing. Results: The conical implant showed significantly higher primary stability than the cylindric hybrid implant using the insertion torque, Periotest, and push-out tests. For both types of implants, the torque moment values following under-dimensioned preparation were significantly better than those obtained following the standard drilling protocol (Conical: 25.00 vs 11.00 Ncm; Cylindrical: 11.75 vs 5.75 Ncm). For the cylindric implant, significantly better results following under-dimensioned implant bed preparation were observed only with the insertion torque and the pushout testing values. The mean ISQ values for all groups were between 55 and 57; no statistical differences with respect to ISQ could be found. Conclusion: In this in vitro model conical implants showed higher primary stability than cylindric implants. The procedure of under-dimensioned drilling seemed to increase primary stability for both types of implants; however, the effect was only observable using insertion torque. RFA and Periotest, the noninvasive, clinical methods tested, did not clearly demonstrate this difference. Int J Oral Maxillofac Implants 2006;21:560–566

Key words: bone condensing, conical implants, dental implants, primary stability, tapering angle of implants

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