Tsunori M, Mashita M, Kasai K
Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
Angle Orthod. 1998 Dec;68(6):557-62. doi: 10.1043/0003-3219(1998)068<0557:RBFTAT>2.3.CO;2.
The purpose of this study was to evaluate relationships between morphological characteristics of vertical sections of the mandibular body and facial type. Of the correlation coefficients between tooth and bone inclination and facial type parameters, facial height index (FHI) was negatively associated with second premolar (P2), first molar (M1), and second molar (M2) inclinations. The angle represented by Frankfort horizontal plane to mandibular plane (FMA) was negatively associated with bone inclination of the M2 section. The buccal cortical bone was thicker in short-faced individuals than in the average and long-faced groups, while lingual cortical bone thickness of the M1 and M2 sections was greater. The basal cortical bone thickness of the L1 section was greater in the short-faced group, and the inclinations of the P2, M1, and M2 axes were significantly smaller. Teeth in the short-faced group inclined more lingually than in the average- and long-faced groups. The results of this study provide evidence that a significant but complex relationship exists between structures of the mandibular body and facial types. The morphological features that relate to masticatory function and facial types are associated with cortical bone thickness of the mandibular body and the buccolingual inclination of the first and second molars.
本研究的目的是评估下颌体垂直截面的形态特征与面部类型之间的关系。在牙齿与骨倾斜度和面部类型参数之间的相关系数中，面部高度指数（FHI）与第二前磨牙（P2）、第一磨牙（M1）和第二磨牙（M2）的倾斜度呈负相关。法兰克福水平面与下颌平面所成角度（FMA）与M2截面的骨倾斜度呈负相关。短脸个体的颊侧皮质骨比平均脸和长脸组更厚，而M1和M2截面的舌侧皮质骨厚度更大。短脸组L1截面的基底皮质骨厚度更大，P2、M1和M2轴的倾斜度明显更小。短脸组的牙齿比平均脸和长脸组更向舌侧倾斜。本研究结果表明，下颌体结构与面部类型之间存在显著但复杂的关系。与咀嚼功能和面部类型相关的形态特征与下颌体的皮质骨厚度以及第一和第二磨牙的颊舌倾斜度有关。
