Department of Pediatric Dentistry and Orthodontics, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Department of Orthodontics and Pediatric Dentistry, University of Maryland, Maryland, Baltimore, USA.
Orthod Craniofac Res. 2023 Nov;26(4):687-694. doi: 10.1111/ocr.12677. Epub 2023 May 29.
The aim of this cross-sectional study was to investigate maxillomandibular morphology in hyperdivergent and hypodivergent individuals, using 3D surface models generated by cone-beam computed tomography (CBCT).
The sample consisted of 60 CBCTs (30 males, 30 females) patients aged 12-30 years, divided into two groups comprising hyperdivergent (≥35°) and hypodivergent (≤30°) individuals, according to the mandibular plane (MP) angle. Multiplanar reconstructions were used to mark the landmarks, and 3D surface models were created to evaluate structures of the maxillomandibular complex, including condyle, ramus, symphysis and palatal height. Intergroup comparisons were performed by independent t-test. Pearson's correlation test was used (P < .05) to evaluate the correlation of the MP angle with the angles and linear measurements of other structures.
Significant differences were found between the groups regarding condylar width, ramus height, condylar plus ramus height, mandibular length, gonial angle, palatal plane angle and palatal-mandibular angle. No differences (P > .05) were found for the condylar height, symphysis inclination angle or palatal height. Correlations (P < .05) were found between the MP angle and structures of the maxillomandibular complex.
Hyperdivergent (MP ≥ 35°) and hypodivergent (MP ≤ 30°) individuals present different skeletal morphology regarding condylar width, ramus height, condylar plus ramus height, mandibular length, gonial angle, palatal plane angle and palatal-mandibular angle. There is a significant correlation between MP angle and morphological structures such as condyle, ramus, symphysis, palatal plane angle and palatal-mandibular angle.
本横断面研究旨在通过锥形束 CT（CBCT）生成的 3D 表面模型，研究高角和低角患者的上颌下颌形态。
该样本包括 60 名 CBCT（30 名男性，30 名女性）患者，年龄在 12-30 岁之间，根据下颌平面（MP）角分为高角（≥35°）和低角（≤30°）两组。使用多平面重建来标记标志点，并创建 3D 表面模型来评估上颌下颌复合体的结构，包括髁突、下颌支、颏联合和腭高度。通过独立 t 检验进行组间比较。使用 Pearson 相关检验（P<0.05）评估 MP 角与其他结构的角度和线性测量值之间的相关性。
两组之间在髁突宽度、下颌支高度、髁突加下颌支高度、下颌长度、下颌角、腭平面角和腭-下颌角方面存在显著差异。髁突高度、颏联合倾斜角或腭高度方面无差异（P>0.05）。MP 角与上颌下颌复合体的结构之间存在相关性（P<0.05）。
高角（MP≥35°）和低角（MP≤30°）个体在髁突宽度、下颌支高度、髁突加下颌支高度、下颌长度、下颌角、腭平面角和腭-下颌角方面表现出不同的骨骼形态。MP 角与髁突、下颌支、颏联合、腭平面角和腭-下颌角等形态结构之间存在显著相关性。
