无托槽隐形矫治推下颌磨牙远中移动的治疗效果研究  

A study on the treatment effect of mandibular molar distalization with invisible aligner

作　　者：蒋理亚 林军[3] JIANG Liya;LIN Jun(Department of Preventive Dentistry,Shanghai Stomatological Hospital,Fudan University,Shanghai 200300,China)

机构地区：[1]上海市口腔医院口腔预防科,上海200300 [2]上海市颅颌面发育与疾病重点实验室,上海200300 [3]浙江大学医学院附属第一医院口腔正畸科,浙江杭州310058

出　　处：《口腔医学》2024年第2期100-104,共5页Stomatology

基　　金：国家自然科学基金(81970978)。

摘　　要：目的 分析使用无托槽隐形矫治推下颌磨牙远中移动牙齿的移动表达率以及其副作用移动。方法 选取24例使用无托槽隐形矫治完成推下颌磨牙远中移动的患者,利用治疗前后的CBCT建立三维坐标系,定位下颌第一、第二磨牙及切牙的牙冠牙根标志点并获得牙齿治疗前后位置的坐标、轴倾角及转矩角,结合牙齿预设移动量分析无托槽隐形矫治对推下颌磨牙远中移动的表达率,用配对样本t检验比较磨牙和切牙在非计划移动方向上坐标的差异及轴倾角、转矩角的差异分析牙齿的副作用移动。结果 下颌第一磨牙牙冠的牙齿移动表达率最高,可达71%,牙根的移动表达率则显著小于牙冠(P<0.05)。在推下颌磨牙远中移动的过程中,磨牙产生压低及颊向倾斜的副作用移动(P<0.05),切牙的副作用移动不显著(P>0.05)。结论 无托槽隐形矫治对推下颌磨牙远中移动的磨牙远移表达率较高,牙冠大于牙根,但移动过程中应注意减少磨牙的压低移动和颊向倾斜。Objective The expression rates and the side effect movements of teeth were analyzed after the mandibular molar distalization treated by the invisible aligner.Methods A total of 24 patients who accepted the mandibular molar distalization by the invisible aligner were selected.A three-dimensional coordinate system was established,and the landmarks of crowns and roots of the molars and incisors were located using the pre-treatment and post-treatment CBCT.The coordinates of crowns and roots,the inclinations and torques of the teeth were obtained.The expression rates of tooth movements were calculated by comparing the actual movement and the preset movement.The side effect movements of teeth were studied by paired t-test by comparing the changes in coordinates of incisors and molars in the unplanned movement direction and the inclinations and torques of the teeth.Results The moving expression rate of the crown of mandibular first molar was the highest,which was up to 71%.The side effect movements like the depression and buccal tilt of the molars could happen during the process of mandibular molar distalization by the invisible aligner(P<0.05),but the side effect movements of incisors were not significant(P>0.05).Conclusion The invisible aligner has a high expression rate of tooth movement in mandibular molar distalization,and the expression rate of crown is larger than root.However,attentions should be paid to reduce depression and buccal tilt of the molars during tooth movement.

关 键 词：下颌推磨牙远中移动 无托槽隐形矫治 牙齿移动表达率 

分 类 号：R783.5[医药卫生—口腔医学]