Accuracy of computer-guided implant placement in anterior regions

Statement of problem: Implant placement in the anterior regions is often challenging because of limited space and bone volume availability. Purpose: The purpose of this clinical study was to investigate the accuracy of computer-guided surgery with a long drill key to place implants in the anterior regions. Material and methods: Computer-guided implant surgery was performed for 32 participants requiring implants in anterior regions. The procedure involved using a 12-mm-long drill key to guide the 2.0-mm-diameter drill. Deviations between the planned and actual implant positions were evaluated by using cone beam computed tomography (CBCT)scans obtained before and after surgery. A t test was used for comparisons between the planned and placed implants and to determine the influence of the arch (maxilla/mandible)and time (immediate/delayed)on accuracy. Results: A total of 40 implants (20 implants in the maxilla and 20 implants in the mandible)were placed. The mean linear deviation was 0.46 mm (range, 0 to 1.15 mm)for the implant shoulder and 0.67 mm (range, 0.14 to 1.19 mm)for the implant apex. The mean angular deviation was 1.40 degrees (range, 0.30 to 2.57 degrees). The mean depth deviation was 0.15 mm (range, 0.10 to 0.82 mm). Conclusions: This clinical study showed that the accuracy of computer-guided implant placement may be enhanced by using a long drill key and may thus enable more accurate implant placement in anterior regions.