| 2478 Crestal Bone Reactions to Microthreads Incorporated in Implant Collar | ||
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C.G. TOH1, C.H. SIAR1, D. SEIZ2, T.B. TAIYEB-ALI1, and S.T. ONG1, 1University of Malaya, Kuala Lumpur, Malaysia, 2Johann Wolfgang Goethe University of Frankfurt, Frankfurt am Main, Germany Stable crestal bone levels are believed to be critical for the long term success of implant treatment. Objective: To compare radiographically and histometrically crestal bone response to a new implant collar with microthread design with that of a smooth machined collar when used to support fixed prosthesis in the posterior mandible. Methods: After extraction of the second mandibular premolars and all three mandibular molar teeth of eight adult male Macaca fascicularis monkeys and a period of 1 month healing, 8mm implants (Ankylos®, Dentsply Friadent, Germany) with unknown collar designs (coded A, B and C) were inserted in a random order to replace the missing teeth. 3 implants on each side of the mandible were exposed and metal linked crowns were fabricated and cemented with polycarboxylate cement. One implant in the third molar position in each side of the jaw was left submerged as negative control. Radiographic records were taken at baseline, 3 months and 6 months. After 6 months, the animals were sacrificed for histometrical examination. An image analyser was used to measure distance from implant top to top of crestal bone (CBL) and distance from implant top to first bone contact (DIB). Results: Group A consisted of implants with smooth machined collars, whilst groups B and C had similar collar designs, i.e. polished machined collars with 13 microthreads, each thread being 0.02 mm deep. Implants with microthreads (Groups B and C) exhibited higher crestal bone levels (CBL) with decreased DIB values than implants with smooth machined collars, but the differences were not statistically significant. Conclusions: The results demonstrate that the microthread design in the Ankylos® implant collar provide good and stable crestal bone response that is better than the conventional smooth machined collar but not significant statistically nor clinically. This research was supported by Dentsply Friadent, Germany R&D 40-02-03-002. | ||
| Seq #200 - Cell Culture & Bone Formation 8:00 AM-10:00 AM, Saturday, 1 July 2006 Brisbane Convention & Exhibition Centre M1 | ||
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