Su Rugan, Li Song, Wang Wei
Department of Orthodontics, School of Stomatology, Capital Medical University, Beijing, China.
Urumql DW Innovation InfoTech Co., Ltd., Xinjiang, China.
Eur J Med Res. 2024 Dec 24;29(1):623. doi: 10.1186/s40001-024-02228-1.
The primary focus of this investigation was to evaluate the biomechanical effects of high trimline design aligners on the distalization of mandibular molars, employing three-dimensional finite element analysis (3D-FEA). The study concentrated on aspects such as tooth movement, stress distribution, and anchorage control.
Utilizing Cone-beam computed tomography (CBCT) data, a detailed 3D geometrical model was constructed for finite element analysis. This model was used to assess four variations of aligner trimlines, alongside the employment of Class III traction. Analyses were conducted to examine stress distributions and tooth displacements in these different scenarios.
Aligners with a high trimline design were found to be more effective in facilitating the distal movement of mandibular molars than those with scalloped trimlines, providing improved management over tooth movement and stress distribution. In specific configurations where Class III traction was applied, a reduction in the deformation of anterior teeth was observed, which enhanced anchorage stability. Nevertheless, the anterior teeth in all configurations were subjected to compressive stresses that surpassed thresholds likely to induce external root resorption, underlining the importance of vigilant monitoring.
The research verified the biomechanical advantages of high trimline aligners in the distal movement of mandibular molars and underscored the critical role of aligner design and traction application in optimizing orthodontic treatment outcomes. Additionally, it raised concerns regarding the potential for root resorption due to significant stress in the periodontal ligament, necessitating thorough observation of patients, particularly those fitted with high trimline aligners. Despite these insights, the study's findings are derived from the data of a single patient, suggesting a need for further investigations involving broader samples and extended clinical assessments.
本研究的主要重点是采用三维有限元分析（3D-FEA）评估高边缘线设计的矫治器对下颌磨牙远移的生物力学影响。该研究集中在牙齿移动、应力分布和支抗控制等方面。
利用锥形束计算机断层扫描（CBCT）数据构建详细的三维几何模型用于有限元分析。该模型用于评估矫治器边缘线的四种变化情况，同时应用III类牵引。对这些不同情况下的应力分布和牙齿位移进行分析。
发现高边缘线设计的矫治器在促进下颌磨牙远移方面比扇贝形边缘线的矫治器更有效，在牙齿移动和应力分布管理方面有所改善。在应用III类牵引的特定配置中，观察到前牙变形减少，这增强了支抗稳定性。然而，所有配置中的前牙都受到超过可能导致外部牙根吸收阈值的压应力，这突出了密切监测的重要性。
该研究证实了高边缘线矫治器在下颌磨牙远移中的生物力学优势，并强调了矫治器设计和牵引应用在优化正畸治疗结果中的关键作用。此外，该研究引发了对由于牙周膜中显著应力导致牙根吸收可能性的担忧，需要对患者进行全面观察，尤其是佩戴高边缘线矫治器的患者。尽管有这些见解，但该研究结果来自单一患者的数据，表明需要进一步开展涉及更广泛样本和扩展临床评估的研究。
