Taju Waleed, Sherriff Martyn, Bister Dirk, Shah Sophia
Department of Orthodontics, Umm Al-Qura University College of Dentistry, Al Abedyah Campus, Makkah, Saudi Arabia.
School of Oral & Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol, UK.
Eur J Orthod. 2018 Apr 6;40(2):200-205. doi: 10.1093/ejo/cjx049.
To assess if severity of hypodontia is related to a specific skeletal pattern.
Lateral cephalometric radiographs and dental panoramic tomographs of 182 hypodontia patients were analysed. The severity of hypodontia was recorded and the sample was divided into groups with mild (n = 71), moderate (n = 56) and severe (n = 55) hypodontia. According to ethnicity, the sample was further subdivided into White Caucasians, African-British, and Arabian/Indian subgroups. Cephalometric measurements were used to quantify the skeletal discrepancy and vertical facial dimensions. Mean and standard deviation for each group were obtained for comparison and an analysis of variance (ANOVA) was carried out to assess the level of significance between the means of the readings in different severity groups.
In the white Caucasian group, increased severity of hypodontia, was related to a retrusive maxilla with concomitant reduction of A point, Nasion, B point (ANB), reduced mandibular plane angle and anterior lower facial height (P value: 0.0935-0.9371). For the Black-British and Arabian/Indian groups' findings were inconsistent, with no specific pattern as the number of missing teeth increased.
The white Caucasian group followed a pattern that has previously been reported in other studies. For Black-British and Arabian/Indian groups' findings were inconsistent and no specific pattern emerged for different degrees of hypodontia.
评估缺牙症的严重程度是否与特定的骨骼模式相关。
分析了182例缺牙症患者的头颅侧位X线片和牙科全景体层摄影片。记录缺牙症的严重程度，并将样本分为轻度（n = 71）、中度（n = 56）和重度（n = 55）缺牙症组。根据种族，样本进一步细分为白种人、非裔英国人以及阿拉伯/印度亚组。采用头影测量法量化骨骼差异和面部垂直维度。获取每组的均值和标准差进行比较，并进行方差分析（ANOVA）以评估不同严重程度组读数均值之间的显著性水平。
在白种人组中，缺牙症严重程度增加与上颌后缩伴A点、鼻根点、B点（ANB）减小、下颌平面角减小以及前下面高减小有关（P值：0.0935 - 0.9371）。对于非裔英国人和阿拉伯/印度组，结果不一致，随着缺失牙数量增加没有特定模式。
白种人组遵循了先前其他研究中报道的模式。对于非裔英国人和阿拉伯/印度组，结果不一致，不同程度的缺牙症未出现特定模式。
