Prediction Accuracy of two Methods in Mixed Dentition

Different mixed dentition analysis are used in order to develop a proper orthodontic treatment plan, however, there are not studies to determine the accuracy of their predictions in Venezuelan populations so far, Objective: Determine the accuracy of the Moyers and Tanaka-Johnston analysis, in the prognosis of mesiodistal widths of unerupted canines and premolars, in mouth models of Mérida population, Methods: Observational descriptive study, not experimental, transactional, which were included a sample of 71 models from a bank of models in a private clinic of Mérida State, to apply Moyers and Tanaka and Johnston predictive analysis. Later mesiodistal widths of canines and premolars erupted were measured in order to compare them, with the predictive data, the results were placed in a data table. The observation was the data collection technique. The predictions obtained were shown using descriptive statistics and to calculate the difference between each prediction the Student t test statistic was applied, Results: Moyers analysis showed no statistically significant differences for the probability table of 95% in the maxillary segment (p = 0.371) and probability table of 85% and 95% (p = 0.503 and p= 0.109) respectively, in the mandibular segment. The Tanaka-Johnston analysis showed statistically significant differences, Conclusions: The Moyers´ probability level of 95% is the closest to reality, to determine the mesiodistal diameter of canines and premolars, in the studied population of Mérida, Venezuela.