Journal
JOURNAL OF CRANIO-MAXILLOFACIAL SURGERY
Volume 38, Issue 6, Pages 436-440Publisher
CHURCHILL LIVINGSTONE
DOI: 10.1016/j.jcms.2009.10.025
Keywords
dental implantation; image processing; computer-assisted; three-dimensional; patient care planning
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Objectives: The present study describes a new method of evaluating the precision of surgically placed dental implants compared after virtual planning of implant positions using cone-beam computed tomography (CT) data and surgical guide templates. This method reduces radiation exposure for patients participating in scientific studies. Materials and methods: Twenty-three implants in 10 patients with a unilateral free-end gap in the mandible (Kennedy Class II) were evaluated. After three-dimensional planning of implant position, the implant bed was prepared with a surgical guide template and transmucosal drilling. Preoperative cone-beam CT images were matched with postoperative images of the master cast with implant replicas. Deviations between planned and achieved positions were measured in position and axis. Results: On average, the match between planned and placed implant axis was within 4.2 degrees (range, 0.0-10.0). The mean difference in distance at the implant shoulder was 0.9 mm (range 0.0-4.5). The mean difference in distance at the implant apex was 0.6 mm (range, 0.0-2.7) in the lateral/medial direction and 0.9 mm (range, 0.0-3.4) in the anterior/posterior direction. Conclusions: This alternative matching method provides reliable postoperative evaluation of differences in position and axis of planned and placed implants while reducing patient radiation exposure. (C) 2009 European Association for Cranio-Maxillo-Facial Surgery
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