Abstract
Objective: To examine applicability of Tanaka & Johnston prediction in Nepalese sample. Materials & Method: A total of 100 samples of the age ranging from 14-24 years were selected for the measurement of mesio-distal widths of mandibular permanent incisors, and maxillary and mandibular permanent canines and premolars. Descriptive statistics was calculated and paired t-test was carried out to find the difference between predicted and actual values of canine and premolar mesio-distal widths. The linear regression equation was performed to develop new equation for Nepalese sample. Result: Mean differences were observed in actual and predicted values between the present study and the reports of Tanaka & Johnston. Coefficient of correlation was found for maxilla, r=0.52 and mandible, r =0.51. Conclusion: The equations and charts used for other ethnic sample do not accurately predict for Nepalese sample. The linear regression equation developed in this study can be used for orthodontic treatment for Nepalese patients.DOI: http://dx.doi.org/10.3126/ojn.v3i1.9269 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 14-18
Highlights
An important aspect of orthodontic diagnosis in the mixed dentition is the determination of tooth size-arch length discrepancy
It is believed that most of the malocclusions start during mixed dentition period, and early treatment is becoming popular in the contemporary orthodontic practice.[1]
Space analysis during mixed dentition is a fundamental step to determine any tooth size-arch length discrepancy. In such cases it is important to predict the deficiency in arch space in advance before the permanent posterior teeth erupt for evaluating whether treatment will involve space maintenance, serial extraction, space regaining, proximal stripping etc.[1,2,3,4,5]
Summary
An important aspect of orthodontic diagnosis in the mixed dentition is the determination of tooth size-arch length discrepancy. It is believed that most of the malocclusions start during mixed dentition period, and early treatment is becoming popular in the contemporary orthodontic practice.[1] Space analysis during mixed dentition is a fundamental step to determine any tooth size-arch length discrepancy. In such cases it is important to predict the deficiency in arch space in advance before the permanent posterior teeth erupt for evaluating whether treatment will involve space maintenance, serial extraction, space regaining, proximal stripping etc.[1,2,3,4,5]. The present study was designed to evaluate the applicability of Tanaka & Johnston method in predicting the size of unerupted permanent canine and premolars of the Nepalese samples
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