目的:本研究的目的是评估上颌切牙前移后下颌骨的生长和/或投射,过位校正,不使用任何II类力学的上颌牙槽扩张,在成长中的II类2例患者中,使用清晰的对齐器治疗。
方法:治疗前后,锥形束计算机断层摄影(CBCT)对32例骨骼II类2级患者进行了横向和后前头颅造影,治疗组16例,未治疗组16例,进行审查以评估与治疗相关的变化。上切牙倾斜并突出,作为常规治疗的一部分,进行了上弓扩张和咬合矫正。进行头影分析以评估骨骼和牙齿的变化。进行非配对统计t检验以确定在治疗组中是否实现了显著的骨骼II类校正。
结果:在治疗组中,治疗后,上切牙变得更加前倾和突出,与对照组相比,磨牙间宽度增加,而咬合减少。还观察到骨骼下颌生长和向前投射的增加,因此,与对照组相比,ANB和Wits值证明了矢状骨骼关系的改善。
结论:上切牙前倾的组合,纠正深过咬,使用清晰的对齐器进行上颌牙槽骨扩张似乎有助于改善II类2级患者的骨骼II类关系。
结论:这项研究表明,通过纠正深咬合来解锁下颌骨,倾斜上切牙,在成长中的II类2级患者中扩大上弓可以使用清晰的对齐器改善骨骼II类。如何引用这篇文章:MirzasoleimanP,El-BialyT,WiltshireWA,etal.使用清晰对齐器进行正畸治疗后,对II类2类受试者的下颌投影进行评估。JConTempDentPract2024;25(4):295-302。
OBJECTIVE: The purpose of this study was to evaluate the mandibular growth and/or projection following maxillary incisor proclination, overbite correction, and maxillary dentoalveolar expansion without the use of any class II mechanics, in growing class II division 2 patients treated with clear aligners.
METHODS: Before and after treatment cone-beam computed tomographic (CBCT) generated lateral and posteroanterior cephalograms of thirty-two patients with skeletal class II division 2, 16 in the treatment group and 16 in the untreated group, were reviewed to evaluate treatment-related changes. Upper incisors were proclined and protruded, as well as upper arch expansion and overbite correction were performed as part of their regular treatment. Cephalometric analysis was performed to evaluate skeletal and dental changes. Unpaired statistical t-tests were performed to determine if significant skeletal class II correction was achieved in the treatment group.
RESULTS: In the treatment group, after treatment, the upper incisors became more proclined and protruded, and the inter-molar width increased while the overbite was reduced compared to the control group. An increase in skeletal mandibular growth and forward projection was also observed, thus contributing to an improvement of the sagittal skeletal relationship as evidenced by ANB and Wits values compared to the control group.
CONCLUSIONS: A combination of upper incisor proclination, correction of deep overbite, and maxillary dentoalveolar expansion using clear aligners appears to contribute to an improvement of the skeletal class II relationship in growing patients with class II division 2.
CONCLUSIONS: This study shows that unlocking the mandible by correcting a deep overbite, proclining upper incisors, and expanding the upper arch in growing class II division 2 patients can improve skeletal class II using clear aligners. How to cite this article: Mirzasoleiman P, El-Bialy T, Wiltshire WA, et al. Evaluation of Mandibular Projection in Class II Division 2 Subjects Following Orthodontic Treatment Using Clear Aligners. J Contemp Dent Pract 2024;25(4):295-302.