Ferreira Marcos Cezar, Freitas Karina Maria Salvatore de, Herrera-Sanches Francyle Simões, Santos Patrícia Bittencourt Dos, Garib Daniela, Janson Guilherme, Freitas Marcos Roberto de
Multidisciplinary Dental Institute (IOM), Rio de Janeiro, RJ, Brazil and São Leopoldo Mandic, Campinas, SP, Brazil.
Department of Orthodontics, Uningá University Center, Maringá, PR, Brazi.
Eur J Dent. 2020 Mar;14(2):250-259. doi: 10.1055/s-0040-1709932. Epub 2020 May 21.
The purpose of this study was to evaluate and compare the axial inclination of the mandibular first molars and their respective bone morphology among individuals with different facial patterns.
The sample comprised the cone beam computed tomographies (CBCTs) of 58 subjects divided into three groups according to the facial patterns: 18 brachyfacial (Group 1), with a mean age of 21.58 years; 23 mesofacial (Group 2), with a mean age of 19.14 years; and 17 dolichofacial subjects (Group 3), with a mean age of 19.09 years. Eight variables were evaluated on CBCT scans of each subject: buccal and lingual mandibular height, cervical and middle mandibular width, inclination of mandibular body, inclination of the mandibular molar buccal surface, molar width, molar angulation and tooth/bone angle. Intergroup comparisons were performed with one-way analysis of variance followed by Tukey tests.
Buccal mandibular height presented statistically significant difference in the three facial patterns. Lingual mandibular height and mandibular inclination showed to be statistically and significantly smaller in brachyfacial subjects than in the other two groups. Mandibular width presented a statistically significant difference between brachyfacial and mesofacial groups. Negative correlations could be observed between the facial pattern and the buccal and lingual mandibular heights and inclination of the mandibular body.
Buccal mandibular height was significantly and progressively larger in brachyfacial, mesofacial, and dolichofacial subjects. Lingual mandibular height was significantly smaller in brachyfacial than in mesofacial and dolichofacial subjects. Mandibular width was significantly thicker in brachyfacial than in mesofacial subjects. Brachyfacial subjects had smaller mandibular inclination than mesofacial and dolichofacial subjects.
本研究旨在评估和比较不同面型个体下颌第一磨牙的轴向倾斜度及其相应的骨形态。
样本包括58名受试者的锥形束计算机断层扫描（CBCT），根据面型分为三组：18名短面型（第1组），平均年龄21.58岁；23名中面型（第2组），平均年龄19.14岁；17名长面型受试者（第3组），平均年龄19.09岁。对每位受试者的CBCT扫描评估八个变量：下颌颊侧和舌侧高度、下颌颈和中部宽度、下颌体倾斜度、下颌磨牙颊面倾斜度、磨牙宽度、磨牙角度和牙/骨角度。采用单因素方差分析和Tukey检验进行组间比较。
下颌颊侧高度在三种面型中存在统计学显著差异。短面型受试者的下颌舌侧高度和下颌倾斜度在统计学上显著小于其他两组。下颌宽度在短面型和中面型组之间存在统计学显著差异。面型与下颌颊侧和舌侧高度以及下颌体倾斜度之间存在负相关。
短面型、中面型和长面型受试者的下颌颊侧高度显著且逐渐增大。短面型受试者的下颌舌侧高度显著小于中面型和长面型受试者。短面型受试者的下颌宽度显著厚于中面型受试者。短面型受试者的下颌倾斜度小于中面型和长面型受试者。
