Al-Gumaei Waseem S, Al-Attab Reem, Long Hu, Lai Wenli, Jian Fan
Department of Orthodontics, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
Department of Orthodontics and Maxillofacial Orthopaedics, College of Dentistry, Ibb University, Ibb, Yemen.
Prog Orthod. 2025 Jul 1;26(1):21. doi: 10.1186/s40510-025-00569-z.
This study aimed to compare the designed and achieved maxillary teeth movements in patients undergoing first premolar extraction after the initial series of Invisalign treatment using a 3D whole-tooth (crown with root) model and research the related influencing factors.
Thirty-three consecutive adult patients (Class I with crowding or bimaxillary protrusion) from a single clinical division who completed the first series of aligners after first premolar extractions were included in this retrospective study. The pretreatment, designed, and post-first series treatment teeth (crowns, roots, and bone) models were exported from ClinCheck software (Align Technology). The superimposition of the models and 3D tooth movement measurements were constructed using Geomagic Studio Software 2014 (Raindrop Geomagic Inc., USA). Descriptive and analytical statistics were performed, and a P-value < 0.05 was considered statistically significant.
Significant discrepancies were observed between the designed and achieved maxillary tooth movements, particularly in mesiodistal (except U1) and buccolingual (except U6) angular tooth movements (P < 0.05). In contrast, non-significant discrepancies were observed in linear buccolingual movements (P > 0.05). Significant discrepancies in mesiodistal (all teeth) and vertical (U1, U5, U6) tooth movements were more pronounced (P < 0.05). Key influencing factors included the usage of TADs, aligner generation (G6), attachment design, overbite, and gender (P < 0.05).
This study highlights significant deviations between the designed and achieved maxillary teeth (crowns with roots) movements following the first premolar extractions in the initial series of Invisaligntreatment. Key findings demonstrate significant mesiodistal (except U1) and buccolingual (except U6) angular movement deviations. While linear buccolingual movements were well-controlled, mesiodistal and vertical (U1, U5, U6) discrepancies were more pronounced, influenced by factors such as TADs usage, aligner generation (G6), attachment design, overbite, and gender. These findings may provide further evidence for virtual design during clear aligner treatment.
本研究旨在使用三维全牙（冠部与根部）模型，比较接受初次前磨牙拔除的患者在初始系列隐适美治疗后设计的上颌牙齿移动与实际实现的上颌牙齿移动，并研究相关影响因素。
本回顾性研究纳入了来自单一临床科室的33例连续成年患者（安氏I类，伴有牙列拥挤或双颌前突），这些患者在拔除第一前磨牙后完成了第一系列矫治器治疗。从ClinCheck软件（隐适美公司）导出治疗前、设计的以及第一系列治疗后的牙齿（冠部、根部和牙槽骨）模型。使用Geomagic Studio软件2014（美国Raindrop Geomagic公司）构建模型叠加和三维牙齿移动测量。进行描述性和分析性统计，P值<0.05被认为具有统计学意义。
观察到设计的上颌牙齿移动与实际实现的上颌牙齿移动之间存在显著差异，特别是在近远中向（除U1外）和颊舌向（除U6外）的角度牙齿移动方面（P<0.05）。相比之下，颊舌向线性移动方面观察到无显著差异（P>0.05）。近远中向（所有牙齿）和垂直向（U1、U5、U6）的牙齿移动差异更为明显（P<0.05）。关键影响因素包括微种植体支抗的使用、矫治器代数（G6）、附件设计、覆合以及性别（P<0.05）。
本研究强调了在初始系列隐适美治疗中，初次前磨牙拔除后设计的上颌牙齿（冠部与根部）移动与实际实现的移动之间存在显著偏差。主要发现表明近远中向（除U1外）和颊舌向（除U6外）存在显著的角度移动偏差。虽然颊舌向线性移动得到了良好控制，但近远中向和垂直向（U1、U5、U6）的差异更为明显，受到微种植体支抗使用、矫治器代数（G6）、附件设计、覆合以及性别的影响。这些发现可能为透明矫治器治疗期间的虚拟设计提供进一步的证据。
