Accuracy of Robotic Computer-Assisted Implant Surgery Combined With Transcrestal Sinus Floor Elevation for Single-Tooth Implants: A Retrospective Case Series.

AIM To evaluate the accuracy and safety of robotic computer-assisted implant surgery (r-CAIS) for transcrestal sinus floor elevation (TSFE) in single-tooth implant placement. MATERIALS AND METHODS In this retrospective case series, we assessed the positional accuracy of r-CAIS combined with TSFE in the posterior maxilla. Preoperative and postoperative cone-beam computed tomography (CBCT) scans were used to determine implant positioning accuracy. Subgroup analyses evaluated the effects of various factors on accuracy. Additionally, complications were recorded and evaluated. RESULTS A total of 40 patients and 40 implants were included. Only one case (Case XIX) exhibited a Schneiderian membrane perforation, resulting in a perforation rate of 2.5% (1/40). The mean global coronal and apical deviations were 0.50 ± 0.22 mm and 0.54 ± 0.21 mm, respectively, with an angular deviation of 1.25° ± 0.61°. A linear mixed model (LMM) analysis revealed no statistically significant differences between subgroups (implant position, side of arch, bone quality, implant type, implant size and registration method) and implant deviations (p > 0.05). CONCLUSIONS r-CAIS showed excellent accuracy and safety for TSFE in single-tooth implant placement. This study suggests r-CAIS can achieve favourable clinical outcomes, although further clinical evidence is needed to confirm its broader efficacy.