Abstract: Objective　To design a computer navigation and establish a 3D printing system for precise implantation of micro-implant anchorage, and to study the accuracy of the technology. Methods　A total of 15 patients (30 microimplants) who required microimplant implantation and were admitted to Department of Stomatology, Affiliated Hospital of Jiangnan University from November 2020 to November 2021 were selected, including 6 males and 9 females, aged (17.11±6.28) years. Before surgery, the medical digital imaging and communication (DICOM) file of cone beam CT (CBCT) and the STL file scanned by the model were imported into the 3 Shape Dental System software. Relevant data fitting and matching operations needed to be processed to design the 3D guide plate. Assist implantation method was used intraoperatively, and postoperative CT was used to evaluate the position and implantation angle of micro-implant anchorage. Compared with the original design, paired t test was used. Results　The feasibility of precise implantation method of micro-implant anchorage guided by 3D guide plate was determined, and the production process was designed. CBCT data before and after microimplant implantation were compared; the meandeviations of neck and root from the original design were (0.13±0.40) mm and (0.21±0.60) mm, respectively, and the mean deviation of angle was (1.15±3.21)° in the mesial-distal direction and (1.25±3.71)°in the buccal-lingual direction respectively, showing no statistically significant differences (all P>0.05). There were 26 grade Ⅰ microimplants and 4 grade Ⅱ microimplants, without grade Ⅲ microimplant. No loosening of microimplants was recorded 1 and 3 months after surgery. Conclusions　Microimplant implantation is more accurate under the guidance of 3D guide plate. This technology can achieve accurate positioning, thus ensuring the safety, stability, and success rate after implantation.

Key words: Micro-implant anchorage, 3D guide plate, Precision, Assist implantation

摘要： 目的　进行微种植支抗精准植入的计算机导航设计和3D打印系统的建立，并对此技术的精准度进行研究。方法　选取2020年11月至2021年11月江南大学附属医院口腔科就诊的15例（共30颗）需行微种植体植入术的患者，其中男6例，女9例，年龄（17.11±6.28）岁。术前需要在3 Shape Dental System软件中将锥形束CT（CBCT）的医学数字成像和通信（DICOM）文件与模型所扫描的STL文件导入其中，需要处理完成相关数据拟合匹配操作，设计出3D导板。术中采用助攻法植入，术后CT评估微种植支抗的位置和植入角度。采用配对t检验。结果　确定3D导板引导下微种植支抗精准植入方法的可行性，设计制作流程，完成微种植体手术导板的设计与制作。经过CBCT验证，在微种植体颈部、根部与原设计的平均偏差值分别为（0.40±0.13）mm、（0.60±0.21）mm，角度平均偏差值在近远中向、颊舌向分别为（3.21±1.15）°、（3.71±1.25）°，差异均无统计学意义（均P>0.05）。Ⅰ级、Ⅱ级各为26颗、4颗，无Ⅲ级。术后1、3个月微种植体均无松动记录。结论　3D导板引导下，微种植体的植入更精确，该技术做到精确定位，从而保证了植入后的安全性、稳定性和成功率。

关键词: 微种植支抗, 3D导板, 精准, 助攻