Cephalometric Assessment of Changes in Vertical Facial Height Following Extraction of Mandibular Second Premolars in Adult Long-face Patients with Skeletal Open Bite: A Case Series

Mohammad Behnaz, K. Dalaie, Simasadat Seyedsalehi, Shiva Shekarian
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Abstract

Ab s t r Ac t Aim: Anterior open bite has a multifactorial etiology and high tendency to relapse. Thus, treatment of this malocclusion is challenging. Tooth extraction has been proposed by some researchers for correction of skeletal anterior open bite. This study aimed to assess cephalometric changes of vertical facial height in patients with skeletal open bite following extraction of mandibular second premolars. Materials and methods: Thirteen adult patients with a mean age of 24.08 years underwent extraction of second premolars and fixed orthodontic treatment for correction of skeletal anterior open bite. Lateral cephalograms of patients were evaluated at baseline, immediately after treatment and 1 year after treatment. Some cephalometric parameters such as the sum of posterior angles, sella-nasion-mandibular plane (SN-MP), lower anterior facial height (LAFH), upper 1-sella-nasion (U1-SN), incisor mandibular plane angle (IMPA), and overbite were measured and compared at different time points. Cephalometric data were analyzed using SPSS via the repeated measures ANOVA. Results: Treatment resulted in positive overbite, which remained stable at 2 years after treatment. The sum of posterior angles, the Jarabak index, SN-MP, LAFH, sella-nasion-B point (SNB), A point-nasion-B point (ANB), U1-SN, and IMPA also showed statistically significant changes (p < 0.05). Conclusion: Open bite closure in patients was mainly due to relative extrusion and retrusion of anterior teeth in both jaws. The results at the 24-month follow-up showed stability of treatment, although longer follow-ups are required to reach a definite judgment. Clinical significance: This treatment can help long-face patients who are not candidate of orthognathic surgery because of complicated systemic conditions or those patients who do not want to have any surgery.
成人长脸骨开咬患者下颌第二前磨牙拔除后面部垂直高度变化的头颅测量评估:一个病例系列
前言:目的:前牙开咬的病因多因素,复发率高。因此,这种错颌的治疗是具有挑战性的。一些研究者提出拔牙矫正骨前开咬。本研究旨在评估下颌第二前磨牙拔除后骨骼开咬患者的垂直面部高度的头颅测量变化。材料与方法:13例成人患者,平均年龄24.08岁,采用第二前磨牙拔除固定正畸治疗矫正骨前开咬。在基线、治疗后立即和治疗后1年评估患者的侧位脑电图。测量并比较不同时间点后角、鞍-鼻-下颌平面(SN-MP)、下前面高(LAFH)、上1-鞍-鼻(U1-SN)、切下颌平面角(IMPA)、复咬合等颅面测量参数。使用SPSS进行重复测量方差分析。结果:治疗后覆盖牙合呈阳性,治疗后2年保持稳定。后角之和、Jarabak指数、SN-MP、LAFH、鞍-鼻- b点(SNB)、A点-鼻- b点(ANB)、U1-SN、IMPA变化也有统计学意义(p < 0.05)。结论:患者的开咬闭合主要是由于双颌前牙的相对挤压和后缩所致。24个月的随访结果显示治疗的稳定性,尽管需要更长的随访时间才能得出明确的判断。临床意义:这种治疗方法可以帮助那些由于复杂的全身情况而不适合正颌手术的长脸患者或那些不想做任何手术的患者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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