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OBJECTIVE: To determine the accuracy of Tanaka and Johnston and
Bherwani's prediction equations when applied to a sample of Pashtun
population of Pakistan.
METHODS: Odontometric data from casts of 180 subjects (90 males and 90
females, ages 13-19 years) of Pashtun origin was collected using digital callipers.
Mesiodistal widths of mandibular incisors, mandibular and maxillary canines and
premolars were measured. Data was analyzed using SPSS software version 20.
RESULTS: Data was analysed for 90 male and 90 female subjects with a mean
age of 15.7±1.7years and 15.4±1.5 years, respectively. Statistically significant
right and left tooth size difference was found only for upper arch in males (mean
0.08, p=0.027). Statistically significant gender dimorphism was noted with
males showing larger tooth sizes. Tanaka and Johnston equations significantly
overestimated the sizes of canine and premolars segments for upper (mean
difference=0.72±0.96, p=0.000) and lower (mean difference=0.75±0.94,
p=0.000) arches when applied to ethnic Pashtun population. Customized
regression equations represented by y=a+b(x) were derived for unerupted
canine and premolars segments of Pashtun population. The values for
coefficient of correlation (r) ranged from 0.59 to 0.73 and the coefficient of
2
determination (r ) ranged from 0.36-0.52.
CONCLUSION: Tanaka and Johnston equations developed for North
th American population (at 75 percentile) should be used with caution for mixed
dentition analyses in local Pashtun population as it overestimates tooth sizes in
males and females. Regression equations developed in this study can be used for
diagnostic planning in local Pashtun children.
Akbar Ali Khan, Saman Baseer, Noor Durrani, Imran Tajik. (2018) APPLICABILITY OF MIXED DENTITION PREDICTION EQUATIONS IN CONTEMPORARY POPULATION OF PASHTUNS, KHYBER MEDICAL UNIVERSITY JOURNAL, Volume 10, Issue 3.
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