Reliability of Beta-angle in different anteroposterior and vertical combinations of malocclusions

IF 0.5 Q4 DENTISTRY, ORAL SURGERY & MEDICINE

Orthodontic Waves Pub Date : 2019-09-01 DOI:10.1016/j.odw.2019.02.002

Maged Sultan Alhammadi , Bushra Sufyan Almaqrami , BaoChang Cao

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引用次数: 3

Abstract

Purpose

The aim of this study was to evaluate three-dimensionally the reliability of Beta angle and its validity in different skeletal anteroposterior and vertical malocclusions.

Materials and methods

This is a retrospective cross-sectional study. Two hundred and thirteen pre-treatment Cone-beam Computed Tomography (CBCT) scans (104 males and 109 females) were used in this study. Based on ANB angle, 100 patients were characterized as skeletal Class I (ANB = 2.17 ± 1.1°), 62 as skeletal Class II (ANB = 5.8 ± 1.47°), and 51 as skeletal Class III (ANB = −2.32 ± 2.42°), and subdivided based on the mandibular plane angle (MP/SN) into normodivergent (MP/SN = 32.09 ± 2.31°) and hyperdivergent (MP/SN = 40.45 ± 3.71°) groups. All cephalometric indicators were measured on 3D volumetric images using Anatomage software 5.2. Descriptive statistics and Pearson correlation between all variables irrespective of skeletal Class or growth pattern were performed. p Value of <0.05 was considered significant.

Results

The overall Pearson correlation showed a statistically significant negative correlation (p < 0.001) between ANB and Beta angle (0.856). There was no significant (p < 0.05) difference in the values of Beta angle, B–X and A–X distance for Class I, Class II and Class III malocclusion with normal and vertical growth pattern.

Conclusions

This three dimensional study interprets the stability of Beta angle irrespective of the difference in craniofacial morphology and growth pattern. Beta angle showed a strong correlation with ANB thus, can be used interchangeably in diagnosis of skeletal malocclusion.

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β角在不同前后垂直组合错牙合中的可靠性

目的从三维角度评价β角在不同骨正、垂直错颌中的可靠性和有效性。材料与方法本研究为回顾性横断面研究。在本研究中使用了预处理前锥体束计算机断层扫描(CBCT) 213张(104名男性和109名女性)。根据ANB角度，骨性ⅰ类100例(ANB = 2.17±1.1°)，骨性ⅱ类62例(ANB = 5.8±1.47°)，骨性ⅲ类51例(ANB =−2.32±2.42°)，并根据下颌平面角度(MP/SN)分为正常矫直组(MP/SN = 32.09±2.31°)和超矫直组(MP/SN = 40.45±3.71°)。使用Anatomage软件5.2在三维体积图像上测量所有头侧指标。对所有变量进行描述性统计和Pearson相关性，而不考虑骨骼类别或生长模式。p值为<0.05认为显著。结果总体Pearson相关性呈显著负相关(p <0.001)， ANB与Beta角(0.856)。无显著性差异(p <ⅰ类、ⅱ类、ⅲ类错颌正常生长模式与垂直生长模式的β角、B-X、A-X距离值差异0.05)。结论该三维研究解释了β角的稳定性与颅面形态和生长方式的差异无关。β角与ANB有较强的相关性，可交替用于骨错的诊断。

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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来源期刊

Orthodontic Waves DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： Orthodontic Waves is the official publication of the Japanese Orthodontic Society. The aim of this journal is to foster the advancement of orthodontic research and practice. The journal seeks to publish original articles (i) definitive reports of wide interest to the orthodontic community, (ii) Case Reports and (iii) Short Communications. Research papers stand on the scientific basis of orthodontics. Clinical topics covered include all techniques and approaches to treatment planning. All submissions are subject to peer review.