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J Craniomaxillofac Surg. 2010 Sep;38(6):436-40. doi: 10.1016/j.jcms.2009.10.025. Epub 2009 Nov 24.

An alternative method to match planned and achieved positions of implants, after virtual planning using cone-beam CT data and surgical guide templates--a method reducing patient radiation exposure (part I).

Author information

1
Department of Prosthodontics, University Hospital Erlangen, Erlangen, Germany. Dr.A.Nickenig@t-online.de

Abstract

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 0.6mm (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.

PMID:
19939692
DOI:
10.1016/j.jcms.2009.10.025
[Indexed for MEDLINE]

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