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Application of Tanaka Johnston and Melgaco Regression Equations Among Nalgonda Population, India

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Dr. S. Thabitha Rani, Dr. Vinay L Kumar, Dr. Kiranmayi. M, Dr. Rajendra E Reddy, Dr. Kamala B K, Dr. Manasa N,
» doi: 10.31838/ecb/2023.12.si6.436


Prediction of mesiodistal widths of unerupted permanent teeth in a specific group of population requires a valid mixed dentition analysis method as tooth dimensions vary with race, gender and ethnicity. Aim: To evaluate the applicability of Tanaka –Johnston’s & Melgaco’s regression equations and to derive new regression equations in predicting the mesiodistal widths of unerupted permanent canines and premolars among Nalgonda population. Materials and methods: A total of 200 children (100 females and 100 males) who have met the selection criteria were included to appraise the applicability of two mixed dentition space analysis MDSA) methods, Tanaka- Johnston’s and Melgaco’s regression equations among Nalgonda population. Statistical analysis was done using correlation coefficients, independent ‘t’ test, paired ‘t’ test, and ANOVA methods. Results: When Melgaco’s regression equation was applied for this group of population, no significant difference between the actual and predicted widths was observed. Tanaka - Johnston’s method tended to overestimate the actual widths of canines and premolars and was not accurate for this group of population. Conclusion: Sum of the mesiodistal widths of mandibular first molar and incisors was found to be good predictor of widths of unerupted mandibular canines and premolars for this group of population.

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