Effect of attachment configuration and trim line design on the force system of orthodontic aligners: A finite element study on the upper central incisor

IF 2.4 3区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

Orthodontics & Craniofacial Research Pub Date : 2024-03-09 DOI:10.1111/ocr.12779

Tarek M. Elshazly, Christoph Bourauel, Mostafa Aldesoki, Damiano Salvatori, Abdulaziz Alhotan, Ludger Keilig, Ahmed Ghoneima

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引用次数: 0

Abstract

Objectives

To use the finite element method (FEM) to investigate the effect of various attachment configurations and trimming line designs of orthodontic aligners on their biomechanical performance.

Method

A 3D upper jaw model was imported into 3D design software. The upper right central incisor tooth (Tooth 11) was made mobile, and its periodontal ligament (PDL) and bone structures were designed. Aligners were modelled with three distinct attachment configurations: No attachment, rectangular horizontal, rectangular vertical, and two trimming line designs; scalloped and straight extended, with a homogeneous thickness of 0.6 mm. These models were then imported into an FE software. Simulations were conducted for three different movements, including facial translation, distalization, and extrusion.

Results

Forces were recorded at 1.3–2.6 N during facial translation, 1.4–5.9 N in distalization, and 0.0–2.0 N in extrusion. The straight extended trimming line consistently generated higher forces than the scalloped design. Attachments had no significant impact on force components during facial translation but were more effective in distalization and extrusion. The combination of a straight extended trimming line with horizontal attachments exhibited the least stresses at the apical third during distalization, and the highest stresses during extrusion, suggesting superior retention.

Conclusions

Rectangular attachments offer limited benefits in facial translation, but horizontal rectangular attachments can intensify load in distalization and are crucial for force generation in extrusion. Horizontal attachments are preferred over vertical options. Additionally, the straight extended trim line enhances control of tooth movement and can replace attachments in certain cases.

Clinical Relevance

These findings provide biomechanical evidence and an optimal protocol to guide clinical practice in planning diverse teeth movements. The emphasis is on the influence of attachment utilization and the specific design of aligner trimming lines to enhance control over tooth movement.

Abstract Image

查看原文本刊更多论文

附着结构和修整线设计对正畸矫治器力系统的影响：上中切牙的有限元研究。

目的使用有限元法（FEM）研究正畸矫治器的各种附件配置和修整线设计对其生物力学性能的影响：将三维上颌模型导入三维设计软件。方法：将三维上颌模型导入三维设计软件，使右上中切牙（第 11 颗牙）具有可移动性，并设计了其牙周韧带（PDL）和骨结构。矫正器的建模有三种不同的附着配置：无附着、水平矩形、垂直矩形，以及两种修整线设计：扇形和直线延伸，厚度均为 0.6 毫米。然后将这些模型导入 FE 软件。对三种不同的运动进行了模拟，包括面部平移、远端化和挤压：结果：面部平移时记录到的力为 1.3-2.6 牛顿，远端化时为 1.4-5.9 牛顿，挤压时为 0.0-2.0 牛顿。直线延长修整线产生的力始终高于扇形设计。在面部平移过程中，附着体对力的分量没有明显影响，但在远端化和挤压过程中更有效。直延伸修整线与水平附着体的组合在远端化过程中显示出最小的根尖三分之一处应力，而在挤出过程中显示出最大的应力，这表明附着体的固位效果更好：结论：矩形附着体对面部平移的益处有限，但水平矩形附着体可以增加远端化时的负荷，对挤压时的力量产生至关重要。水平附着体比垂直附着体更受欢迎。此外，笔直的延伸修整线可以加强对牙齿移动的控制，在某些情况下可以取代附着体：这些研究结果提供了生物力学证据和最佳方案，可以指导临床实践，规划不同的牙齿移动。重点在于附件使用的影响和矫治器修整线的具体设计，以加强对牙齿移动的控制。

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来源期刊

Orthodontics & Craniofacial Research 医学-牙科与口腔外科

CiteScore

5.30

自引率

3.20%

发文量

审稿时长

>12 weeks

期刊介绍： Orthodontics & Craniofacial Research - Genes, Growth and Development is published to serve its readers as an international forum for the presentation and critical discussion of issues pertinent to the advancement of the specialty of orthodontics and the evidence-based knowledge of craniofacial growth and development. This forum is based on scientifically supported information, but also includes minority and conflicting opinions. The objective of the journal is to facilitate effective communication between the research community and practicing clinicians. Original papers of high scientific quality that report the findings of clinical trials, clinical epidemiology, and novel therapeutic or diagnostic approaches are appropriate submissions. Similarly, we welcome papers in genetics, developmental biology, syndromology, surgery, speech and hearing, and other biomedical disciplines related to clinical orthodontics and normal and abnormal craniofacial growth and development. In addition to original and basic research, the journal publishes concise reviews, case reports of substantial value, invited essays, letters, and announcements. The journal is published quarterly. The review of submitted papers will be coordinated by the editor and members of the editorial board. It is policy to review manuscripts within 3 to 4 weeks of receipt and to publish within 3 to 6 months of acceptance.