| 1284 New Assessment of Insertion Torques of Implant by Intraoral Radiograph | ||
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M. HIRATA1, K. KORETAKE1, A. TAGUCHI2, T. KUBO1, K. TANIMOTO3, and Y. AKAGAWA1, 1Hiroshima University, Hiroshima City, Japan, 2Hiroshima University, Hiroshima University Hospital, Japan, 3Hiroshima University, Division of Medical Intelligence and Informatics, Graduate School of Biomedical Sciences, Japan Objectives: Insertion torque is regarded to be an appropriate factor to estimate implant primary stability for osseointegration. However, this torque can not be estimated prior to implant placement. Our previous study revealed a possibility of trabecular bone quality with the aid of three parameters (trabecular area, trabecular number and fractal dimension) from image analysis of intraoral radiographs. The purpose of this study was to clarify the correlation between insertion torques and bone quality evaluated by intraoral radiographs and to develop new method for assessing insertion torque by intraoral radiographs. Methods: Twenty two screw-type implants (Brånemark TiuniteMKⅢ, Nobel Biocare) were placed into the mandible of 10 patients without any systemic diseases. Each insertion torque at implant placement was measured by an instrument (OsseoCare, Nobel Biocare). Implant areas in intraoral radiographs were identified by comparing preoperative and postoperative pictures. Parameters of trabecular bone structures were determined as follow; trabecular area (T.Ar), trabecular number (Tb.N) and fractal dimension (FD). Using these parameters, bone quality was calculated. Simple correlation between insertion torques and bone quality obtained from the radiographs was analyzed by Person's correlation coefficients. A multiple regression analysis was also performed to evaluate the association between insertion torque and trabecular bone parameters. Results: Significant positive correlations were found between insertion torques and bone quality (p<0.05). The relationship between insertion torque and trabecular bone parameters obtained from the radiographs was calculated as insertion torque=1.73×T.Ar–133.04×FD+0.05×Tb.N+179.31 (R = 0.74, p<0.01). Conclusions: These results suggest that insertion torque may be simply and quantitatively anticipated by using this method prior to implant placement. | ||
| Seq #109 - Diagnostics & Drugs 3:30 PM-4:30 PM, Thursday, 29 June 2006 Brisbane Convention & Exhibition Centre Exhibit Hall 1 | ||
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