Alshahrani Abdulaziz Abdullah, Alshahrani Ibrahim, Addas Mohamed Khaled, Shaik Sharaz, Binhomran Faris Mohammed, AlQahtani Jaber
General Dentist, M.O.H, Asir Central Hospital, Abha, Saudi Arabia.
Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia.
Contemp Clin Dent. 2020 Apr-Jun;11(2):141-149. doi: 10.4103/ccd.ccd_455_19. Epub 2020 Aug 7.
BACKGROUND/PURPOSE: Tooth size discrepancy is one of the causative factors of malocclusion. This study aimed to establish the TDS among various malocclusion classes and normal occlusion subjects in a Southern Saudi population.
The study casts of orthodontic patients from Southern Saudi Arabia (mean age: 19.6 years ± 2.45; = 120) were randomly selected and grouped into eight equal classes based on Angle's classification and gender. An additional 30 study casts, devoid of malocclusion, having excellent intercuspation and class I occlusion, were grouped into two controls ( = 15) based on gender. The study casts were three-dimensional scanned to measure mesiodistal widths of all the teeth. The calculated anterior ratios (AR) and overall ratio (OR) were statistically analyzed with analysis of variance and -tests.
There were no significant differences in "OR" and "AR" between the genders ( > 0.05) and among the malocclusion and control subgroups ( > 0.05). The mean "OR" (92.01 ± 0.18) and "AR" (78.60 ± 0.27) of the malocclusion group were significantly higher than that of Bolton's ratios ( > 0.05). The "AR" of the control group was significantly higher than Bolton's standards ( = 0.048). However, "OR" was no different ( = 0.105). Malocclusion patients displayed a discrepancy (±2 standard deviation) in "AR" of 22.5% and 'OR' of 6.7% from Bolton's mean (BM). Similarly, the control group displayed a discrepancy in "AR" of 20% and "OR" of 10% from BM.
The mean "OR" and "AR" of the Southern Saudi population showed no sexual dimorphism and no significant difference among various malocclusion and control subgroups. The "AR" of the malocclusion and control subgroups did not comply with Bolton's standards.
背景/目的：牙齿大小不协调是错牙合畸形的致病因素之一。本研究旨在确定沙特南部人群中各类错牙合畸形患者与正常咬合者的牙齿大小不协调情况（TDS）。
随机选取沙特南部正畸患者的研究模型（平均年龄：19.6岁±2.45；n = 120），并根据安氏分类法和性别分为八个相等的类别。另外选取30个无错牙合畸形、牙尖交错良好且为I类咬合的研究模型，根据性别分为两个对照组（n = 15）。对研究模型进行三维扫描，以测量所有牙齿的近远中宽度。对计算出的前牙比率（AR）和总比率（OR）进行方差分析和t检验。
性别之间（P > 0.05）以及错牙合畸形组与对照组亚组之间（P > 0.05）的“OR”和“AR”均无显著差异。错牙合畸形组的平均“OR”（92.01±0.18）和“AR”（78.60±0.27）显著高于博尔顿比率（P > 0.05）。对照组的“AR”显著高于博尔顿标准（P = 0.048）。然而，“OR”无差异（P = 0.105）。错牙合畸形患者的“AR”与博尔顿均值（BM）相差（±2标准差）22.5%，“OR”相差6.7%。同样，对照组的“AR”与BM相差20%，“OR”相差10%。
沙特南部人群的平均“OR”和“AR”无性别差异，在各类错牙合畸形组与对照组亚组之间也无显著差异。错牙合畸形组与对照组亚组的“AR”均不符合博尔顿标准。
