牙支持式导板设计制造误差及对种植精度的影响.

BACKGROUND: The implant template can effectively transfer the implant designed position to the patient’s jaw. It helps implant avoid important anatomical structures such as nerve and maxillary sinus, and effectively reduces the risk of surgery. Therefore, the accuracy of implant template surgery is particularly important. OBJECTIVE: To assess the design and manufacturing error of the tooth-supported surgical template and its implant accuracy in the fully positioned state. METHODS: A patient with missing teeth underwent a cone beam CT and a plaster model was established. According to the patien’s oral situation, implant plan with special positioning surface tooth-supported template was designed and implant template was made. Stereo Lithography Apparatus rapid prototyping technology was used to fabricate 10 templates and three-dimensional laser scanning was performed. After matching the scanning data with designed template model data, manufacturing error analysis was carried out. In addition, the 10 manufactured templates were worn on the patient’s plaster model to simulate implant position, and the simulated implant positions were matched with initial implant positions in the design plan for accuracy analysis. RESULTS AND CONCLUSION: (1) The mean positive deviation of the template was 0.093 mm; the mean negative deviation was 0.092 mm, and the mean standard deviation was 0.169 mm. (2) The simulated implant accuracy results showed that the neck center deviation of implant 12 was (1.172±0.283) mm; the top center deviation was (1.339±0.283) mm; the central axis angle deviation was (0.365±0.228)°; the neck center deviation of implant 21 was (1.274±0.379) mm; the top center deviation was (1.461±0.404) mm, and the center axis angle deviation was (0.643±0.276)°. (3) These results indicate that the design and manufacturing error of tooth-supported template with a specific positioning surface has a significant impact on implant accuracy. [ABSTRACT FROM AUTHOR]