APPLICABILITY OF MOYER’S AND TANAKA-JOHNSTON MIXED DENTITION ANALYSIS IN SCHOOL CHILDREN OF SRI GANGANAGAR DISTRICT (RAJASTHAN) – A PILOT STUDY
Journal Title: IDA Ludhiana's Journal - Le Dentistry - Year 2017, Vol 1, Issue 3
Abstract
Introduction: Mixed dentition analysis enables the clinician to identify tooth size-arch length discrepancy and, according to the results obtained, proposes different treatment approaches such as: serial extraction, guidance of eruption, space maintenance, space regaining or just periodic observation of the patient. Of all the mixed‑dentition analysis, the methods that are used most commonly are the Moyers probability charts and Tanaka‑Johnston equation. These methods are based on the data obtained from an unspecified number of North American white children. Therefore the accuracy of these prediction methods could possibly be in question when applied to a population of different ethnic origin. Materials and Methods: The dental study models of 60 subjects (30 males and 30 females) including children studying in different schools of Sri- Ganganagar city and from Out Patient Department (OPD) of the college in the age group of 12 – 16 years were taken. Measurements were made onto those casts of the sum of mandibular anterior mesiodistal widths and the sum of mesiodistal widths of erupted canines and premolars. The values obtained were subjected to statistical analysis.Results: The correlation co-efficient between the sum of mandibular incisors and the sum of canine and premolars were 0.42 (for upper arch) and 0.53 (for lower arch) in male subjects, and 0.51 and 0.61 respectively, in female subjects. Conclusion: The results of the present study led to the following conclusion: Both Moyers (75%) & Tanaka and Johnston prediction methods were not as accurate when applied to sample of Sri Ganganagar population since they tend to overestimate the actual measurements.
Authors and Affiliations
Himani Thakur, Jonathan PT
Keywords
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