Assessment of Moyers and Tanaka-Johnston mixed dentition analyses for the prediction of mesiodistal diameters of unerupted canines and premolars


  • Paola María Botero Universidad CES
  • Diana P. Cuesta Universidad CES
  • Sandra Agudelo Universidad CES
  • Catalina Hincapié Universidad CES
  • Carolina Ramírez Universidad CES



Prediction, Reproducibility, Unerupted tooth


Introduction: the objective of this study was to determine whether the methods of Moyers (M) percentile (p) 75, p85, p95 and Tanaka-Johnston (TJ), used in the prediction of the mesiodistal diameter of unerupted canines and premolars, either overestimate or underestimate their respective succedaneous diameter. Methods: diagnostic technology assessment in 56 plaster models of schoolchildren from Medellin, with class I skeletal and permanent erupted incisors, canines, and bicuspids, with follow-ups from 6 to 12 years of age. The teeth mesiodistal diameter was measured by the predictive methods of Tanaka-Johnston and Moyers p75, p85, p95. The predicted and actual values were evaluated by means of related Student’s t test and Wilcoxon test. These methods’ reproducibility was calculated by intraclass correlation coefficient (ICC) (95% CI), and their level was calculated using Bland-Altman 95% limits. Results: in the upper arch, significant actual value differences were observed with the T-J and Mp95 measurements. In the lower arch, the values of all the methods were different to the actual value (p > 0.05), except Mp75. Reproducibility was higher in the upper arch with T-J, followed by Mp85; in the lower arch, Mp75 was the method with the best reproducibility, followed by Mp85. In the upper arch, T-J overestimates the actual measurement by 0,333 mm in average (95% CI 2.100;1.434), and in the lower arch Mp75 overestimates by 2.14 (95% CI-2,020;1.592). Conclusion: the best predictive method for the upper arch is Tanaka-Johnston, and for the lower arch, Moyers at the 75th percentile; although both methods overestimate the actual value, they show adequate reproducibility.

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Author Biographies

Paola María Botero, Universidad CES

Especialista en Ortodoncia CES

Diana P. Cuesta, Universidad CES

Phd epidemiología


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How to Cite

Botero, P. M., Cuesta, D. P., Agudelo, S., Hincapié, C., & Ramírez, C. (2014). Assessment of Moyers and Tanaka-Johnston mixed dentition analyses for the prediction of mesiodistal diameters of unerupted canines and premolars. Revista Facultad De Odontología Universidad De Antioquia, 25(2), 359–371.

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