Department of Orthodontics, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
College of Dental Medicine, QU Health, Qatar University, Doha, Qatar.
Clin Exp Dent Res. 2022 Dec;8(6):1516-1522. doi: 10.1002/cre2.647. Epub 2022 Aug 17.
To find out if there is any relationship between tooth size discrepancy (TSD) and skeletal anterior open bite (AOB) and to assess the correlation between the amount of AOB and TSD.
A total of 100 Class I subjects were included in this study (average age 15.21 ± 2.84 years). Fifty patients had skeletal AOB (>3 mm) and 50 subjects acted as controls and had a normal overbite. Teeth mesio-distal widths were measured using a digital caliper. Anterior, overall, and posterior TSD ratios were calculated. An independent t-test was employed to assess differences between groups and between genders. Pearson correlation coefficient was used to assess the correlation between the amount of AOB and TSD.
Significant differences in anterior (p = .038) and posterior (p = .015) TSD ratios were detected. In the skeletal AOB group, no significant gender differences were detected (p > .05), whereas in the normal bite and total sample group, males had smaller posterior teeth compared to females (p < .05). All the differences were smaller than 1 SD of Bolton's ratios. No significant correlation was found between the amount of AOB and TSD ratios (p > .05).
Skeletal AOB had larger anterior and smaller posterior mandibular teeth, but the differences were less than 1 SD of Bolton's ratios. Males have smaller mandibular posterior teeth than females. The amount of AOB is not correlated with the TSD ratios.
探讨牙量不调（TSD）与骨性前牙开颌（AOB）之间是否存在关系，并评估 AOB 量与 TSD 之间的相关性。
本研究共纳入 100 名 I 类错颌患者（平均年龄 15.21±2.84 岁）。50 例患者存在骨性 AOB（>3mm），50 例作为对照组，覆颌正常。使用数字卡尺测量牙齿近远中宽度。计算前牙、总牙和后牙 TSD 比值。采用独立 t 检验评估组间和性别间差异。采用 Pearson 相关系数评估 AOB 量与 TSD 之间的相关性。
前牙（p=.038）和后牙（p=.015）TSD 比值存在显著差异。在骨性 AOB 组中，性别间无显著差异（p>.05），而在正常覆颌组和总样本组中，男性的后牙比女性小（p<.05）。所有差异均小于 Bolton 比值的 1SD。AOB 量与 TSD 比值之间无显著相关性（p>.05）。
骨性 AOB 患者下颌前牙较大，后牙较小，但差异小于 Bolton 比值的 1SD。男性的下颌后牙比女性小。AOB 量与 TSD 比值无相关性。
