基于三维冠根整合模型在无托槽隐形矫治中的临床疗效研究

目的 通过建立一种冠根融合的三维模型，评估无托槽隐形矫治器在非拔牙病例中前牙区的临床效果，为临床应用提供指导。方法 收集2020年12月—2021年12月在徐州市口腔医院正畸科就诊患者11例，利用Maestro 3D Dental Studio排牙软件设计矫治方案，获取患者矫治结束预期三维模型，并通过锥形束CT、口内扫描、三维重建软件建立患者术后模型，在Geomagic Studio 2014中进行牙冠与牙根数据的配准，在3-matic中对比治疗后实际模型与治疗前预测模型前牙的转矩与轴倾度的差异。结果 前牙的实际转矩角均小于治疗前的预测角度，其中侧切牙的实现率最高达到了77.55%,中切牙最低为60.70%;前牙的实际轴倾角也同样小于治疗前的预测角度，其中中切牙实现率最高达到了81.49%,尖牙最低为74.95%。结论 基于三维重建及口内扫描技术结合的冠根整合数字化模型，在评估隐形矫治器疗效方面具有优势。在隐形矫治非拔牙病例中，前牙区小范围的移动效率较高。

Study on clinical efficacy of a 3D model based on crown-root integration in clear aligners

Objective To evaluate the clinical effect of clear aligners in the anterior region in non-extraction cases by establishing a three-dimensional model of crown-root fusion to guide clinical application. Methods Eleven patients visiting the orthodontic department of Xuzhou Stomatological Hospital from December 2020 to December 2021 were collected, and the orthodontic plan was designed using Maestro 3D Dental Studio scheduling software to obtain the expected three-dimensional model of the patient's orthodontic treatment result. CBCT, intraoral scan, and 3D reconstruction software were used to create a postoperative model of the patient. The crown and root data were aligned in Geomagic Studio 2014, and differences in torque and axial inclination between the actual model after treatment and the predicted model of the anterior teeth before treatment were compared in 3-matic. Results The actual torque angles of the anterior teeth were all smaller than the predicted angles before treatment, with the highest realization rate of 77.55% for lateral incisors and the lowest of 60.70% for central incisors; the actual axial inclination angles of the anterior teeth were also smaller than the predicted angles before treatment, with the highest realization rate of 81.49% for central incisors and the lowest of 74.95% for cuspids. Conclusion A digital model of crown-root integration based on a combination of 3D reconstruction and intraoral scanning techniques is advantageous in assessing the efficacy of clear aligners. In non-extraction cases with clear aligner, the efficiency of movement is higher for small areas of the anterior region.