Yu Zi-Hang, Duan Yi-Ge, Cui Yu-Tong, Tian Yu-Lou
Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Disease, Cental Laboratory, School of Stomatology, China Medical University. Shenyang 110002, Liaoning Province, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2024 Jun;33(3):312-317.
This study aimed to measure and analyze the transverse indicators of normodivergent patients with different sagittal skeletal malocclusions, to explore the transverse characteristics of different sagittal skeletal malocclusions.
Lateral cephalograms and CBCT of 90 normodivergent patients with skeletal Class Ⅰ, Ⅱ and Ⅲ in their permanent dentition were collected. Dolphin software was applied to measure the widths of the basal bone, alveolar bone, dental arch and buccolingual inclination angle of the corresponding teeth in the maxillary and mandibular canine, premolar and molar areas. SPSS 22.0 software package was applied for statistical analysis of the data.
The widths of the mandibular basal bone in canine, premolar and molar areas of skeletal Class Ⅲ were (27.15±2.74), (39.30±2.82) and (59.97±2.93) mm, respectively. The widths of the mandibular alveolar bone of skeletal Class Ⅲ were (25.38±1.78), (34.51±2.28) and (47.72±2.73) mm, respectively. The dental arch widths of the maxillary premolar and mandibular canine areas of skeletal Class Ⅲ were (48.70±2.35) and (30.69±2.31)mm, respectively. The above data of skeletal Class Ⅲ were significantly larger than those of skeletal Class Ⅰ and Ⅱ(P＜0.01). The dental arch widths of the maxillary canine, maxillary molar and mandibular molar areas of skeletal Class Ⅲ were (38.88±1.90), (59.51±3.40) and (56.01±2.86)mm, respectively, which were significantly larger than those of skeletal Class Ⅱ(P＜0.05). The maxillomandibular width difference of basal bone in the canine, premolar and molar areas of skeletal Class Ⅲ were (4.69±2.84), (2.31±2.39) and (3.27±2.05) mm, respectively, which were significantly less than that of skeletal Class Ⅰ and Ⅱ(P＜0.01). Compared with skeletal Class Ⅰ, the maxillary canines and first molars of skeletal Class Ⅱ had larger lingual inclination level, while the maxillary first premolars and first molars of skeletal Class Ⅲ had larger buccal inclination level, the mandibular canines and the mandibular first premolars of skeletal Class Ⅲ had larger lingual inclination level(P＜0.01).
For normodivergent patients, the width of the mandibular base bone, alveolar bone, and maxillary and mandibular dental arch in skeletal Class Ⅲ is the widest, which is more likely to have width discrepancy in basal bone. In skeletal Class Ⅲ, the maxillary teeth are buccally inclined, and the mandibular teeth are ingually inclined. In skeletal Class Ⅱ, the maxillary teeth are lingually inclined, and the mandibular teeth are compensatory upright.
本研究旨在测量和分析不同矢状骨面型安氏Ⅰ、Ⅱ、Ⅲ类正常发散型患者的横向指标，探讨不同矢状骨面型的横向特征。
收集90例恒牙期安氏Ⅰ、Ⅱ、Ⅲ类正常发散型患者的头颅侧位片和锥形束CT（CBCT）。应用Dolphin软件测量上颌和下颌尖牙、前磨牙及磨牙区相应牙齿的基骨宽度、牙槽骨宽度、牙弓宽度及颊舌向倾斜角度。采用SPSS 22.0软件包对数据进行统计分析。
安氏Ⅲ类患者下颌尖牙区、前磨牙区及磨牙区的基骨宽度分别为（27.15±2.74）mm、（39.30±2.82）mm和（59.97±2.93）mm。安氏Ⅲ类患者下颌牙槽骨宽度分别为（25.38±1.78）mm、（34.51±2.28）mm和（47.72±2.73）mm。安氏Ⅲ类患者上颌前磨牙区和下颌尖牙区的牙弓宽度分别为（48.70±2.35）mm和（30.69±2.31）mm。安氏Ⅲ类的上述数据均显著大于安氏Ⅰ类和Ⅱ类（P＜0.01）。安氏Ⅲ类患者上颌尖牙区、上颌磨牙区及下颌磨牙区的牙弓宽度分别为（38.88±1.90）mm、（59.51±3.40）mm和（56.01±2.86）mm，显著大于安氏Ⅱ类（P＜0.05）。安氏Ⅲ类患者尖牙区、前磨牙区及磨牙区的上下颌基骨宽度差值分别为（4.69±2.84）mm、（2.31±2.39）mm和（3.27±2.05）mm，显著小于安氏Ⅰ类和Ⅱ类（P＜0.01）。与安氏Ⅰ类相比，安氏Ⅱ类患者上颌尖牙和第一磨牙舌倾度较大，而安氏Ⅲ类患者上颌第一前磨牙和第一磨牙颊倾度较大，安氏Ⅲ类患者下颌尖牙和下颌第一前磨牙舌倾度较大（P＜0.01）。
对于正常发散型患者，安氏Ⅲ类患者的下颌基骨、牙槽骨及上下颌牙弓宽度最宽，基骨宽度差异更明显。安氏Ⅲ类患者上颌牙齿颊倾，下颌牙齿舌倾。安氏Ⅱ类患者上颌牙齿舌倾，下颌牙齿代偿直立。
