The objective of this study was to evaluate the effect of anchor-guiding sleeve length on the accuracy of computer-guided flapless implant surgery in edentulous cases. Twelve identical polyurethane edentulous mandibular models were equally divided into short and long anchor-guiding sleeve groups based on the type of anchor-guiding sleeve. After implant placement and scan body connections, digital impressions were taken using the intraoral scanner. Using the software's measurement function, the deviation parameters between the planned and actual position of the placed implants were calculated and compared using the Mann-Whitney U test. In the short anchor-guiding sleeve group, the median angular deviation was 4.05° (range, 2.87°–7.55°). The median linear deviation was 1.17 mm (range, 0.24–2.17 mm) for the implant apex and 0.82 mm (range, 0.43–1.67 mm) for the implant shoulder. The median deviation of the depth was 0.31 mm (range, 0.20–0.79 mm). In the long anchor-guiding sleeve group, the median angular deviation was 2.70° (range, 1.77°–4.08°). The median linear deviation was 0.88 mm (range, 0.21–1.77 mm) for the implant apex and 0.63 mm (range, 0.11–1.97 mm) for the implant shoulder. The median deviation of the depth was 0.24 mm (range, 0.09–0.53 mm). There were significant differences between the 2 groups in the angular and linear deviations at the implant apex and the shoulder and depth deviation. The accuracy of the muco-supported surgical guide was improved using the long anchor-guiding sleeve, thus providing more accurate flapless implant placement in edentulous models. However, model experiments do not always produce predictable and possible uncontrolled cause-and-effect outcomes under natural clinical conditions. Therefore, further in vivo investigations are required to determine whether the results of this study are consistent with clinical findings.

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