School of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China.
School of Stomatology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China; The Stomatology Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China; Ningbo Dental Hospital/Ningbo Oral Health Research Institute, Ningbo, Zhejiang, China.
J Stomatol Oral Maxillofac Surg. 2024 Oct;125(5S2):101974. doi: 10.1016/j.jormas.2024.101974. Epub 2024 Jul 21.
This study aimed to investigate the differences in the buccolingual inclination and transverse width of maxillary and mandibular first molars among different vertical facial types.
In all, 78 samples were divided into three groups based on the GoGn-SN angle: the low-angle group (n = 26, mean age=24.21±5.11), average-angle group (n = 26, mean age=22.66±3.72), and high-angle group (n = 26, mean age=22.23±2.43). Cone beam computed tomography (CBCT) measurements were used to assess the buccolingual inclination of the axis of the maxillary and mandibular first molars, as well as the buccolingual inclination of the alveolar bone, the dental arch width, and the basal bone width. One-way ANOVA, the LSD test, and Pearson correlation analysis were performed.
The high-angle group showed significantly greater lingual inclination of the maxillary alveolar bone than the low-angle group and average-angle group (p < 0.001; p < 0.05). The difference in buccolingual inclination of the axis of the maxillary first molar and the alveolar bone was significantly greater in the high-angle group than in the low-angle group (p < 0.05). Both the maxillary and mandibular dental arch were significantly narrower in the high-angle group than in the other two groups. The mandibular basal bone was also significantly narrower in the high-angle group than in the low-angle group and average-angle group (p < 0.001; p < 0.01).
The alveolar bone of maxillary first molar in the high-angle group was more palatal inclined than that the low-angle group and the average-angle group, which suggests that orthodontists should pay more attention to the root-bone relationship in the high-angle group during expansion treatment to prevent bone fenestration and dehiscense.
本研究旨在探讨不同垂直面型患者上颌和下颌第一磨牙颊舌向倾斜度和横向宽度的差异。
共纳入 78 例样本，根据 GoGn-SN 角将其分为三组：低角组（n = 26，平均年龄=24.21±5.11）、均角组（n = 26，平均年龄=22.66±3.72）和高角组（n = 26，平均年龄=22.23±2.43）。采用锥形束 CT（CBCT）测量上颌和下颌第一磨牙轴的颊舌倾斜度以及牙槽骨颊舌倾斜度、牙弓宽度和基骨宽度。采用单因素方差分析、LSD 检验和 Pearson 相关性分析。
高角组上颌牙槽骨的舌向倾斜度显著大于低角组和均角组（p < 0.001；p < 0.05）。高角组上颌第一磨牙轴和牙槽骨颊舌倾斜度的差异显著大于低角组（p < 0.05）。高角组上颌和下颌牙弓均显著小于其他两组。高角组下颌基骨也显著小于低角组和均角组（p < 0.001；p < 0.01）。
高角组上颌第一磨牙牙槽骨更向腭侧倾斜，提示扩弓治疗时应更加关注高角组的根骨关系，以防止骨开窗和骨开裂。
