Abstract: Objective: To investigate the effect of different bone inclinations on the accuracy of dental implant robot. Methods: Three kinds of bone inclination models (45°, 60°, and 90°) were designed. The models were scanned by cone beam computed tomography (CBCT), and the data were imported into the robot system for implant planning. Under the guidance of the robot,a total of 90 implants were implanted at three bone inclinations. The deviation between preoperative implant and actual implantation position was compared by CBCT scan after operation. The main measurement indexes were implant angle deviation, and total deviation of entry and apex. Results: In the 45°, 60°, and 90° groups, the entry deviations were (0.52±0.15) mm, (0.36±0.13) mm, and (0.34±0.15) mm, respectively, the apical deviations were (0.64±0.19) mm, [0.46 (0.42,0.55)] mm, and (0.37±0.15) mm, respectively, and the angle deviations were (1.27±0.22)°, (1.09±0.21)°, and (0.48±0.22)°, respectively (P< 0.05). There were also statistically significant differences in the entry level and depth deviations and the apical level and depth deviations of the apical point (P<0.05). Conclusion: The dental implant robotic system achieved high implant accuracy at all three bone inclinations, demonstrating good clinical outcomes. However, there were differences in accuracy between different bone inclinations.

Key words: computer-assisted surgery, accuracy, bone inclination, dental implant, dental implant robot