Mohammad Moaza Ghuloom, Din Shazia Naser-Ud, Khamis Amar Hassan, Athanasiou Athanasios E
Department of Orthodontics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates.
Orthodontic Clinic, Al Mizhar Health Center, Primary Health Care Center, Dubai Health Authority, Dubai, United Arab Emirates.
Open Dent J. 2018 Sep 28;12:655-663. doi: 10.2174/1745017901814010655. eCollection 2018.
The aims of this investigation in a group of Emiratis were () To study overall and anterior tooth size ratios in Class I normal occlusion, () To estimate overall and anterior tooth size ratios in different malocclusion groups, () To compare overall and anterior tooth size ratios in Class I normal occlusion with the Bolton standards, and () To determine the distribution of overall and anterior tooth size ratios ± 2 SD from Bolton mean values in all occlusion groups.
In this cross-sectional investigation, consecutive patients' files, including dental casts, were selected from the archives of orthodontic clinics of the Dubai Health Authority. The final sample was formed following the application of specific inclusion criteria. The sample consisted of 521 pairs of dental casts representing both sexes (males: 188; females: 333) and different malocclusion groups (Class I: 288; Class II: 110; Class III: 30) and Class I normal occlusion (93). The mean age of patients was 16.18y for Class I, 15.73y for Class II, 15.83y for Class III, and 16.55y for Class I normal occlusion. The dental casts were scanned and digitized by the first author using the Ortho Insight 3D laser scanner. Measurements were made regarding maxillary and mandibular sums of mesiodistal tooth dimension of the overall (6-6) and anterior (3-3) groups of teeth. Statistical analysis included descriptive statistics, paired -test and Analysis of Variance (ANOVA). The level of significance was set at <0.05.
There were statistically significant differences among malocclusion groups with regard to overall and anterior tooth size ratios. However, the comparison between the Class I normal occlusion group and the Bolton standards showed no statistically significant differences. Only five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values and one case in Class I malocclusion presented with an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.
This study of the different occlusion groups of the Emirati sample concluded that () Class I normal occlusion cases presented similar overall and anterior tooth size ratios to Bolton standards; () Overall and anterior tooth size ratios among different malocclusion groups exhibited statistically significant differences; () Five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values, and () One case in Class I malocclusion presented an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.
本研究针对一组阿联酋人的目的是：（）研究I类正常咬合中全牙和前牙的大小比例；（）估计不同错牙合畸形组中的全牙和前牙大小比例；（）将I类正常咬合中的全牙和前牙大小比例与博尔顿标准进行比较；（）确定所有咬合组中全牙和前牙大小比例相对于博尔顿平均值±2标准差的分布情况。
在这项横断面研究中，从迪拜卫生局正畸诊所的档案中选取了连续患者的病历，包括牙模。在应用特定纳入标准后形成最终样本。样本包括521对牙模，代表不同性别（男性：188例；女性：333例）以及不同错牙合畸形组（I类：288例；II类：110例；III类：30例）和I类正常咬合（93例）。I类患者的平均年龄为16.18岁，II类为15.73岁，III类为15.83岁，I类正常咬合为16.55岁。第一作者使用Ortho Insight 3D激光扫描仪对牙模进行扫描和数字化处理。对上颌和下颌总体（6 - 6）和前牙（3 - 3）组牙齿的近远中牙尺寸总和进行测量。统计分析包括描述性统计、配对t检验和方差分析（ANOVA）。显著性水平设定为<0.05。
在错牙合畸形组之间，全牙和前牙大小比例存在统计学上的显著差异。然而，I类正常咬合组与博尔顿标准之间的比较未显示出统计学上的显著差异。II类错牙合畸形中只有5例前牙大小差异超出博尔顿平均值加2标准差，I类错牙合畸形中有1例全牙大小差异超出博尔顿平均值加2标准差。
这项针对阿联酋样本不同咬合组的研究得出结论：（）I类正常咬合病例的全牙和前牙大小比例与博尔顿标准相似；（）不同错牙合畸形组之间的全牙和前牙大小比例存在统计学上的显著差异；（）II类错牙合畸形中有5例前牙大小差异超出博尔顿平均值加2标准差；（）I类错牙合畸形中有1例全牙大小差异超出博尔顿平均值加2标准差。
