| 3287 Influence of Abutment Design on Crestal Bone in Implant-tooth-supported Bridges | ||
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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, Frankfurt, Germany The maintenance of crestal bone is considered essential for successful implant treatment. Objectives: To compare radiographically and histometrically crestal bone response to two different designs of implant abutments when used in implant-tooth-supported bridges. Methods: After extraction of all mandibular molar teeth and 1 month healing, standard 8mm implants (Ankylos®, Dentsply Friadent, Germany) were placed in the region of the second molars of 8 M. fascicularis monkeys. Following 3 months of submerged healing, the implant in one side of each jaw was connected with a tapered (T) abutment and the implant on the contralateral side with a butt joint (B) abutment. The second mandibular premolars were trimmed to form the natural tooth abutments. Metal 3-unit bridges that extended from the second premolar to the second molar were constructed connecting implant abutment to natural tooth abutment. Radiographic records were taken at baseline, 3 months and 6 months. After 6 months of function, the animals were sacrificed for histometrical examination. The radiographs were digitalized and images magnified to evaluate crestal bone levels on a 5-point scale. An image analyser was used to obtain histometrical measurements of distance from implant top to top of crestal bone (CBL) and distance from implant top to first bone contact (DIB). Results: Radiographically, horizontal crestal bone loss was insignificant but there was significantly more (p<0.05) vertical crestal bone loss found in implants with B abutments. The results concur with histometrical findings whereby differences in DIB values were significantly more (p<0.05) for implants with B abutment (0.92±0.59mm) as compared to implants with T abutments (0.45±0.25mm). CBL differences were not significant. Conclusion: Tapered abutment of the Ankylos® implant system can be successfully used to connect implants to natural teeth for fixed prosthesis. This study was supported by Dentsply Friadent, Germany R & D Vote No. 40-02-03-0002. | ||
| Seq #352 - Abutment-Implant Analysis 2:00 PM-4:00 PM, Saturday, 12 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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