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颌间牙大小差异对混合牙列间隙分析预测方程准确性的影响。

Effect of intermaxillary tooth-size discrepancy on accuracy of prediction equations for mixed dentition space analysis.

作者信息

Khanna R, Pandey R K, Tripathi S

机构信息

Department of Paediatric and Preventive Dentistry, King George's Medical University, Lucknow, 226003, Uttar Pradesh, India,

出版信息

Eur Arch Paediatr Dent. 2015 Apr;16(2):211-7. doi: 10.1007/s40368-014-0157-5. Epub 2014 Nov 6.

DOI:10.1007/s40368-014-0157-5
PMID:25373496
Abstract

AIM

Correlation-statistical methods are widely used for prediction of size of unerupted permanent canines and premolars in mixed dentition space analysis. The present study was planned to evaluate the effect of selecting dental study casts with no intermaxillary tooth-size discrepancy on the accuracy of predicting mesiodistal widths (MDWS) of permanent canines and premolars.

STUDY DESIGN

Bolton ratios were calculated for all the screened study dental casts fulfilling the inclusion criteria. Subjects were divided into two groups. Group A: all subjects with no intermaxillary tooth-size discrepancy within ±2 SD (Standard deviation) of the mean values. Group B: increased percentage of subjects with intermaxillary tooth-size discrepancy beyond ±2 SD (Standard deviation) of the mean values.

STATISTICS

Linear regression equations were established for both maxilla and mandible in both the groups, with different tooth combinations as independent variables. Validation of best possible regression equations was done on an independent set of 40 subjects. The actual and predicted values of MDWS of permanent canines and premolars were compared by paired samples t test in both groups, for both arches.

RESULTS

The accuracy of equations derived from group A was higher than those derived from group B. The difference between actual and predicted values was statistically insignificant in group A and statistically significant in group B.

CONCLUSION

The results confirm the accuracy of simple linear regression equations derived from a sample of children with no intermaxillary tooth-size discrepancy.

摘要

目的

在混合牙列间隙分析中，相关性统计方法被广泛用于预测未萌出恒牙尖牙和前磨牙的大小。本研究旨在评估选择无颌间牙大小差异的牙研究模型对预测恒牙尖牙和前磨牙近远中宽度（MDWS）准确性的影响。

研究设计

计算所有符合纳入标准的筛选牙研究模型的博尔顿比率。受试者分为两组。A组：所有颌间牙大小差异在平均值±2个标准差（SD）范围内的受试者。B组：颌间牙大小差异超出平均值±2个标准差（SD）的受试者比例增加。

统计学方法

两组上颌和下颌均以不同的牙齿组合作为自变量建立线性回归方程。在一组独立选取的40名受试者中对最佳回归方程进行验证。两组中，对上颌和下颌的恒牙尖牙和前磨牙的MDWS实际值和预测值进行配对样本t检验比较。

结果

A组得出的方程准确性高于B组。A组实际值与预测值之间的差异无统计学意义，而B组有统计学意义。

结论

结果证实了从无颌间牙大小差异的儿童样本得出的简单线性回归方程的准确性。

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Applicability of regression equation using widths of mandibular permanent first molars and incisors as a predictor of widths of mandibular canines and premolars in contemporary Indian population.在当代印度人群中，使用下颌第一恒磨牙和切牙宽度作为下颌尖牙和前磨牙宽度预测指标的回归方程的适用性。
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Prevalence of tooth size discrepancy among North Indian orthodontic patients.北印度正畸患者牙齿大小差异的患病率。
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Development of a prediction equation for the estimation of mandibular canine and premolar widths from mandibular first permanent molar and incisor widths.
建立下颌第一恒磨牙和切牙宽度预测下颌尖牙和前磨牙宽度的方程。
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Prediction of the mesiodistal width of unerupted permanent canines and premolars: a statistical approach.未萌出恒尖牙和前磨牙近远中宽度的预测：一种统计学方法。
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Mixed dentition analysis in a Jordanian population.约旦人群的混合牙列分析。
Angle Orthod. 2008 Jul;78(4):670-5. doi: 10.2319/0003-3219(2008)078[0670:MDAIAJ]2.0.CO;2.
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