Bou Assi Samar, Macari Anthony, Hanna Antoine, Tarabay Roula, Salameh Ziad
Division of Orthodontics and Dentofacial Orthopedics, Lebanese University & American University of Beirut, Beirut, Lebanon.
Department of Orthodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon.
J Int Soc Prev Community Dent. 2020 Jun 15;10(3):292-299. doi: 10.4103/jispcd.JISPCD_60_20. eCollection 2020 May-Jun.
The aim of this study was to evaluate the inclination of the maxillary incisors (I), facial axis (FA), and growth axis (GA) in different vertical and sagittal patterns.
A total of 498 consecutive orthodontic patients, with an average age of 18.87 years (range = 5-63 years), were grouped based on their vertical and sagittal patterns. Maxillary incisors, FA, and GA axes were traced and their corresponding angles to nasion-basion and true horizontal lines were measured. The sample was divided into three groups based on the mandibular divergence (mandibular plane-MP/sella-nasion [SN]): Group 1-hypodivergent pattern (MP/SN ≤ 27; = 30), Group 2-normodivergent pattern (27 < MP/SN <37; = 254), and Group 3-hyperdivergent pattern (MP/SN ≥ 37; = 214); the sample was then divided into three groups based on the sagittal pattern (ANB, angle between points A, Nasion and B): Group I-skeletal CLI (Class I) (0 <ANB <4; = 228), Group II-skeletal CLII (ANB ≥ 4; = 216), and Group III-skeletal CLIII (ANB ≤ 0; = 54). Group differences were evaluated using the analysis of variance and tests. Chi-square tests were used for testing relationships between categorical variables.
FA/nasion-basion (NBa) and GA/NBa were different among the vertical groups ( < 0.001). FA/NBa was found significantly different in the sagittal groups, whereas GA/NBa was only different between CLII and CLIII groups. Compensation in maxillary incisors' inclination was present in the sagittal groups, but not in the vertical ones. CLI patients when stratified in vertical groups showed FA/NBa and GA/NBa to be different across the three vertical groups.
FA/NBa was found different in the vertical and the sagittal groups. Maxillary incisors compensation was only found in the sagittal and not in the vertical groups.
本研究旨在评估不同垂直和矢状面类型中上颌切牙（I）、面轴（FA）和生长轴（GA）的倾斜度。
连续纳入498例正畸患者，平均年龄18.87岁（范围 = 5 - 63岁），根据其垂直和矢状面类型进行分组。对上颌切牙、FA和GA轴进行描记，并测量它们与鼻根点 - 蝶鞍点连线（NBa）和真水平线的相应角度。样本根据下颌平面角（下颌平面 - MP/蝶鞍点 - 鼻根点连线[SN]）分为三组：第1组 - 低角型（MP/SN ≤ 27；n = 30），第2组 - 均角型（27 < MP/SN < 37；n = 254），第3组 - 高角型（MP/SN ≥ 37；n = 214）；然后样本根据矢状面类型（ANB，点A、鼻根点和B之间的角度）分为三组：第I组 - 骨骼I类（0 < ANB < 4；n = 228），第II组 - 骨骼II类（ANB ≥ 4；n = 216），第III组 - 骨骼III类（ANB ≤ 0；n = 54）。采用方差分析和t检验评估组间差异。卡方检验用于检验分类变量之间的关系。
垂直组间FA/NBa和GA/NBa不同（P < 0.001）。矢状组间FA/NBa有显著差异，而GA/NBa仅在II类和III类组间不同。矢状组存在上颌切牙倾斜度的代偿，垂直组则不存在。I类患者按垂直组分层时，三个垂直组间FA/NBa和GA/NBa不同。
垂直组和矢状组中FA/NBa不同。上颌切牙代偿仅在矢状组中发现，垂直组未发现。
