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Revista clínica de periodoncia, implantología y rehabilitación oral

On-line version ISSN 0719-0107


LARA, Alejandro; NAVARRO, Pablo; SANDOVAL, Catalina  and  SANDOVAL, Paulo. New Method to Predict Mesiodistal Diameter in Unerupted Canine and Premolars Crown. Pilot Study. Rev. Clin. Periodoncia Implantol. Rehabil. Oral [online]. 2019, vol.12, n.1, pp.19-22. ISSN 0719-0107.

Precautionary measures are necessary to prevent a potential irregularity from progressing into a more severe malocclusion. The determination of the tooth size-arch length discrepancy in mixed dentition requires an accurate prediction of the mesiodistal widths of the unerupted permanent teeth to prevent future malocclusions.


The purpose of this study is to generate a new regressive equation to predict the diameter of the cuspid and bicuspid by measuring the wide of lower incisor and upper molar teeth in a Chilean population sample.

Matherials and methods:

the study was conducted in the Araucanía Clinical Center in Temuco city and the sample was composed of historical dental cast from 200 school children (93 boys and 107 girls), of IX region, Chile. Age group of 13-16 years old. Measurements of the mesiodistal widths of mandibular incisors, maxillary and mandibular canines and premolars were made with the help of Vernier gauge calipers calibrated to 0.01 of 1 millimeter.


The results show that there is a moderate correlation between the upper molar and upper and lower premolars. In addition, the lower incisors are correlated to a greater extent with the upper and lower canines. There are no significant differences between men and women.


A new formula with 75% accuracy was developed to predict the width of canine teeth and premolars in mixed dentition in the Chilean population of the Araucanía region. This formula is better than the current Tanaka method.

Keywords : Techniques of support for the decision; Mixed dentition; Tooth size; Discrepancy; Interceptive orthodontics; Molar; Predictive formula.

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