Class II division 1 malocclusion treatment with extraction of maxillary first permanent molars: cephalometric evaluation of treatment and post-treatment changes

IF 0.5 4区 医学 Q4 DENTISTRY, ORAL SURGERY & MEDICINE Australasian Orthodontic Journal Pub Date : 2021-07-01 DOI:10.21307/aoj-2021.032
J. Booij, A. Kuijpers-Jagtman, E. Bronkhorst, F. Rangel, C. Livas, Yijin Ren, C. Katsaros, E. Ongkosuwito
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Abstract

Abstract Objective To investigate the cephalometric outcome and post-treatment changes following the orthodontic treatment involving the extraction of maxillary first molars in patients presenting with a Class II division 1 malocclusion. Methods A retrospective longitudinal study was conducted involving 83 patients treated by fixed appliances and the extraction of 16 and 26. The mean age at commencement was 13.2 ± 1.5 years. Lateral cephalograms were available pre-treatment (T1), immediately post-treatment (T2), and at 2.6 years post-treatment (T3). The sample was divided into hypodivergent (n = 18), normodivergent (n = 17), and hyperdivergent (n = 48) facial types. Mean increments, standard deviations, and 95% confidence intervals were calculated for T2–T1 and T3–T2. Increments were tested using paired-samples t-tests, and variables between groups by applying ANOVA followed by Tukey’s post hoc test. Linear regression was used to examine the effect of facial type, age, and gender. Results Significant changes occurred during treatment for most cephalometric variables. Post-treatment, the growth pattern showed a tendency to return to the original form. Facial type had only a minor influence on cephalometric increments during and after treatment. Conclusions Post-treatment skeletal, soft tissue, and dentoalveolar changes were limited. Facial type had only a minor influence during and after treatment and care must be taken to control lower incisor inclination.
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拔除上颌第一恒磨牙治疗II类1分错:治疗的头颅测量评估及治疗后的变化
摘要目的探讨ⅱ类1分错牙合患者在拔除上颌第一磨牙正畸治疗后的头颅测量结果及治疗后的变化。方法对83例采用固定矫治器治疗的患者进行回顾性纵向研究,其中拔牙16例,拔牙26例。平均入学年龄13.2±1.5岁。治疗前(T1)、治疗后立即(T2)和治疗后2.6年(T3)均可获得侧位脑电图。样本被分为低发散型(n = 18)、无发散型(n = 17)和高发散型(n = 48)。计算T2-T1和T3-T2的平均增量、标准差和95%置信区间。增量采用配对样本t检验,组间变量采用方差分析,随后采用Tukey事后检验。使用线性回归检验面部类型、年龄和性别的影响。结果在治疗期间,大多数头颅测量指标发生了显著变化。处理后,生长形态有恢复原状的趋势。面部类型在治疗期间和治疗后仅对头测量增量有轻微影响。结论治疗后骨骼、软组织和牙槽骨的改变有限。治疗过程中及治疗后,面部类型对下切牙倾斜度影响不大,需注意控制下切牙倾斜度。
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来源期刊
Australasian Orthodontic Journal
Australasian Orthodontic Journal Dentistry-Orthodontics
CiteScore
0.80
自引率
25.00%
发文量
24
期刊介绍: The Australasian Orthodontic Journal (AOJ) is the official scientific publication of the Australian Society of Orthodontists. Previously titled the Australian Orthodontic Journal, the name of the publication was changed in 2017 to provide the region with additional representation because of a substantial increase in the number of submitted overseas'' manuscripts. The volume and issue numbers continue in sequence and only the ISSN numbers have been updated. The AOJ publishes original research papers, clinical reports, book reviews, abstracts from other journals, and other material which is of interest to orthodontists and is in the interest of their continuing education. It is published twice a year in November and May. The AOJ is indexed and abstracted by Science Citation Index Expanded (SciSearch) and Journal Citation Reports/Science Edition.
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