nik Tahere Hosseinzadeh, Majid Shalchi, Fateme Mohandes, Javad Mohammad
Orthodontic department, Dental school and Dental research center, Tehran medical sciences university, Tehran, Iran.
J Clin Pediatr Dent. 2007 Fall;32(1):43-7. doi: 10.17796/jcpd.32.1.r066201525862144.
The aim of this investigation was to examine the accuracy of Moyers probability tables and the Tanaka and Johnston prediction equations in predicting the size of unerupted canines and premolars of the maxillary and mandibular quadrants in an Iranian population and to derive a standard formula for it.
Out of a sample of 280 subjects, 50 (25 males and 25 females) were selected by specific inclusion criteria. An electronic digital caliper was used to read the nearest 0.01 mm. The teeth measurements derived were compared with those predicted from Tanaka Johnston equations and Moyers probability tables and then standard regression were developed.
Tanaka and Johnston regression equations overestimate the mesiodistal width of permanent canines and premolars. There were no statistically significant differences between actual mesiodistal width of canines and premolars and the predicted width from Moyers charts at 65% for the lower and upper arches in male subjects and for the lower arch in females but none of the probabilities has good accuracy for the upper arch in females. For the newly developed regression equations, the correlation coefficients between the sum of the mandibular incisors and the sum of the canine and premolars were 0.709 (for lower) and 0.539 (for upper) in subjects.
Tanaka and Johnston overestimate the actual size for Iranian teeth widths. Moyers method can be used at 65% probability level for male subjects and at the 75% and 85% level for upper arch and the 50% and 65% level for lower arch in female subjects.
本研究的目的是检验莫耶斯概率表以及田中与约翰斯顿预测方程在预测伊朗人群上颌和下颌象限未萌出犬齿和前磨牙大小方面的准确性，并为此推导一个标准公式。
从280名受试者样本中，根据特定纳入标准选取50名（25名男性和25名女性）。使用电子数字卡尺精确到0.01毫米读数。将得出的牙齿测量值与田中 - 约翰斯顿方程和莫耶斯概率表预测的值进行比较，然后建立标准回归方程。
田中与约翰斯顿回归方程高估了恒牙犬齿和前磨牙的近远中宽度。男性受试者上下牙弓以及女性受试者下牙弓中，犬齿和前磨牙的实际近远中宽度与莫耶斯图表预测宽度在65%概率水平时无统计学显著差异，但女性受试者上牙弓的所有概率准确性均不佳。对于新建立的回归方程，受试者下颌切牙总和与犬齿及前磨牙总和之间的相关系数在下颌为0.709，在上颌为0.539。
田中与约翰斯顿方程高估了伊朗人牙齿宽度的实际尺寸。莫耶斯方法在男性受试者中可在65%概率水平使用，在女性受试者中，上牙弓可在75%和85%概率水平使用，下牙弓可在50%和65%概率水平使用。
