Evaluation of validity of Tanaka-Johnston analysis in Mumbai school children

Abstract

Introduction:Estimation of the mesiodistal dimensions of the unerupted canines and premolars in the early mixed dentition is a necessary diagnostic aid in space management. Tanaka-Johnston analysis was developed for North American children. Anthropological study reveals that tooth size varies among different ethnicities. The present study was performed to evaluate the validity of Tanaka-Johnston method of mixed dentition arch analysis in Mumbai school children.Aims:(1) To determine the correlation between the sum of the mesiodistal widths of the permanent mandibular incisors and combined mesiodistal widths of the permanent mandibular and maxillary canines and premolar in Mumbai school children. (2) To examine the applicability of Tanaka-Johnston method of prediction.Materials and Methods:Dental casts of maxillary and mandibular arches of 300 children, 147 boys and 153 girls within the age group of 12–15 years, with permanent dentitions were fabricated. The mesiodistal crown dimensions of teeth were measured with a dial caliper. Tanaka-Johnston method of mixed dentition arch analysis was performed for the study population, and statistical analysis was done.Statistical Analysis Used:Descriptive statistics including the mean, standard deviation, range, and standard error were calculated and tabulated.Results:Tanaka-Johnston's equation when applied to the data available for Mumbai school children, it was observed that it slightly overestimates the tooth size.Conclusions:(1) There was a positive correlation between the width of mandibular incisors and mandibular and maxillary canines and premolars. (2) The Tanaka-Johnston prediction method was not accurate for a sample of Mumbai school children.

Evaluation of Accuracy of Tanaka-Johnston Mixed Dentition Analysis in North Karnataka Population: A Cross-Sectional Study

“…9 Various factors influence tooth size, such as heredity, race, sex, and other extrinsic factors like caries, attrition, measuring methods, cast preparation, the material used for cast preparation, an instrument used for measurement of tooth size, and method of analysis of error. 10 According to previous studies, mandibular incisors are ideal for mixed dentition analysis. 11,12 Main advantages of using mandibular incisors includes early eruption, ease of measurement, least susceptibility for caries, and anomalies.…”

Applicability of Moyers and Tanaka-Johnston analyses for the Arab population of Pekalongan, Indonesia

“…15 Similar results were produced by studies conducted amongst school children in Mumbai. 16 Prediction of C-P1-P2 size in orthodontic treatment influences determination of the treatment plan that will be developed for the patient. Consideration for skeletal expansion during growth and development is one of the treatment plans based on an analysis of space requirements which suggests that the C-P1-P2 size exceeds the available space.…”