Introduction:

The analysis most commonly used by orthodontists to predict the ideal space of the canine and premolars is the Tanaka-Johnston Gold Standard. However, the use of this analysis in other population groups worldwide may be questionable.

Objective:

To predict the ideal space for the eruption of the canine and premolars using the Tanaka-Johnston analysis and that of Ramos, et al.

Material and Methods:

A descriptive study was carried out using 110 pairs of study models with permanent dentition, collected during the period from 2018 to 2019. The mesiodistal widths were measured with a UBERMANN® digital vernier with an accuracy of ± 0.01 mm. Non-parametric statistics were performed on the data obtained using the Kruskal-Wallis comparison test.

Results:

The Tanaka-Johnston analysis showed a difference between the predictive and real values ​​of -0.50 mm (±1.68) with a statistical difference of p=0.0001, and the Ramos et al. analysis was of -0.35 mm (±1.70) with a statistical difference of p=0.0001.

Conclusions:

The ideal space for the eruption of the canine and premolars was underestimated with the Tanaka-Johnston analysis and the analysis validated by Ramos, et al. However, the Ramos, et al. analysis was closer to the actual mesiodistal diameters of the canine and premolars.

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