Asiry Moshabab A, Albarakati Sahar F, Al-Maflehi Nassr S, Sunqurah Alaa A, Almohrij Monirah I
Division of Orthodontics, Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Building No 3500, Riyadh 12372-7051, Kingdom of Saudi Arabia. Fax. +966 (11) 4679017. E-mail.
Saudi Med J. 2014 Sep;35(9):988-92.
To test the applicability of the Tanaka and Johnston prediction method in a Saudi population.
The current study was conducted at the College of Dentistry, King Saud University, Riyadh, Saudi Arabia from September 2013 to January 2014, on a sample of 409 pairs of orthodontic study models. The mesiodistal width of the mandibular permanent incisors, permanent canines, and permanent premolars were measured using an electronic digital caliper with an accuracy of 0.01mm. The predicted widths derived from the Tanaka and Johnston equation were compared with the actual measured widths.
Gender differences were observed in the sum of the mesiodistal width of canine and premolars in both arches as indicated by t-test (p<0.001). The sum of the actual mesiodistal widths of canines and premolars were compared with the predicted widths derived from the Tanaka and Johnston equation and significant differences were found (p<0.001). The regression analysis indicated that the sum of the mesiodistal width of the mandibular permanent incisors is a good predictor for those of unerupted canines and premolars, with the correlation coefficients ranging from 0.51 to 0.61. Accordingly, 2 linear regression equations were developed for tooth width prediction for Saudi males and females.
The Tanaka and Johnston prediction equation overestimated the sum of mesiodistal widths of permanent canines and premolars in Saudis. New regression equations were formulated for the prediction of tooth width in the Saudi population.
检验田中与约翰斯顿预测方法在沙特人群中的适用性。
本研究于2013年9月至2014年1月在沙特阿拉伯利雅得的沙特国王大学牙科学院进行，样本为409对正畸研究模型。使用精度为0.01毫米的电子数字卡尺测量下颌恒切牙、恒尖牙和恒前磨牙的近远中宽度。将田中与约翰斯顿方程得出的预测宽度与实际测量宽度进行比较。
t检验表明，两个牙弓中尖牙和前磨牙近远中宽度之和存在性别差异（p<0.001）。将尖牙和前磨牙实际近远中宽度之和与田中与约翰斯顿方程得出的预测宽度进行比较，发现存在显著差异（p<0.001）。回归分析表明，下颌恒切牙近远中宽度之和是未萌出尖牙和前磨牙近远中宽度之和的良好预测指标，相关系数在0.51至0.61之间。因此，针对沙特男性和女性，开发了2个用于牙齿宽度预测的线性回归方程。
田中与约翰斯顿预测方程高估了沙特人恒尖牙和前磨牙近远中宽度之和。针对沙特人群的牙齿宽度预测制定了新的回归方程。
