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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Comparison of two nonradiographic methods of predicting permanent tooth size in the mixed dentition.
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Comparison of two nonradiographic methods of predicting permanent tooth size in the mixed dentition.

机译：两种非放射线方法预测混合牙列中恒牙大小的比较。

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摘要

The determination of the tooth size-arch length discrepancy in the mixed dentition requires an accurate prediction of the mesiodistal widths of the unerupted permanent teeth. Three approaches have been used to estimate the mesiodistal crown widths of unerupted canines and premolars: (1) measurements from erupted teeth, (2) measurements from radiographs, and (3) a combination of measurements from erupted teeth and from radiographs of unerupted teeth. The purpose of this study was to compare two mixed dentition prediction methods that do not require the use of periapical radiographs of the unerupted permanent teeth. The two methods compared were the Tanaka/Johnston and the Boston University Prediction approaches. Records on 33 male and 22 female subjects who were participants in the Iowa Longitudinal Growth Study were used in the present study. The findings indicated that on the average the Tanaka/Johnston approach slightly overestimated the tooth size of the unerupted teeth (mean = 1.1 +/- 0.9 mm). On the other hand, the Boston University approach slightly underestimated the tooth size of the unerupted teeth (mean = -0.1 +/- 1.2 mm). The findings further indicated that there were statistically significant correlations between the predicted and actual tooth size. In general the r values were higher for the Tanaka/Johnston method than with the Boston University approach. The error involved in the use of the predicted equations was expressed as the standard error of the estimate. The present findings indicated that the standard error of the estimate for Tanaka/Johnston prediction equations ranged between 0.67 and 0.92 mm and the corresponding values for the Boston University equations ranged between 0.92 and 1.02 mm. Depending on the stage of dental development, i.e., which deciduous and permanent teeth are present, the Tanaka/Johnston approach can be used when the four mandibular incisors have completely erupted, whereas the Boston University approach can be used when all the deciduous canines and first molars are still present.
机译：确定混合牙列中的牙齿大小-牙弓长度差异需要准确预测未脱落的恒牙的近中生宽度。已使用三种方法来估计未爆牙和前磨牙的近中顶冠宽度：（1）爆牙的测量，（2）放射线照片的测量和（3）爆牙和未牙齿牙齿的射线照片的组合测量。这项研究的目的是比较不需要使用未脱落的恒牙的根尖周片的两种混合牙列预测方法。比较的两种方法是Tanaka / Johnston和波士顿大学预测方法。本研究使用了爱荷华州纵向生长研究的33位男性和22位女性受试者的记录。研究结果表明，平均而言，田中/约翰斯顿方法稍微高估了未拔牙的牙齿大小（平均= 1.1 +/- 0.9毫米）。另一方面，波士顿大学的研究方法稍微低估了未拔牙的牙齿大小（平均值= -0.1 +/- 1.2毫米）。研究结果进一步表明，预测的和实际的牙齿大小之间存在统计学上的显着相关性。通常，田中/约翰斯顿方法的r值高于波士顿大学方法的r值。使用预测方程式涉及的误差表示为估算的标准误差。目前的发现表明，田中/约翰斯顿预测方程的估计值的标准误在0.67至0.92 mm之间，波士顿大学方程的相应值在0.92至1.02 mm之间。根据牙齿发育的阶段（即存在哪些乳牙和恒牙），当四个下颌切牙完全萌出时，可以使用Tanaka / Johnston入路;而当所有乳牙和第一支乳牙都在使用时，可以使用波士顿大学入路磨牙仍然存在。

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