Abstract
Background: In mixed dentition analysis, estimation of the mesiodistal width of unerupted permanent canines and premolars is essential for successful diagnosis and treatment planning. The present study aimed to develop a simple linear equation to predict permanent tooth sizes from mixed dentition analysis for Taiwanese people. Methods: The sample comprised 200 dental casts, derived from Taiwanese patients (100 males and 100 females; age, 12–35 years). Mesial distal tooth widths were measured in dental casts with a digital caliper. A student’s t-test was conducted to detect tooth size correlations with gender-specific differences, as well as intra-arch counterparts. Standard linear regression was conducted to develop a simple equation representing predictions of canine-premolar relationships. Results: All teeth were not significantly different between the left and right sides, regardless of gender and upper or lower arches. In terms of types of teeth, males had larger tooth dimensions in both arches than females. New regression equations for estimating the dimensions of the unerupted canines and premolars in the Taiwanese population were developed. Conclusions: Using a sample of Taiwanese people, new models derived for females and males separately were developed, which should provide highly accurate predictions for unerupted canines and premolars in the Taiwanese population.
Highlights
In Taiwan, the demands for more quality orthodontic treatments continue to increase.The continuous decline in the age of orthodontic patients challenges the ascending significance of mixed dentition space analysis
Using a paired sample t-test, we found that the Tanaka–Johnston analysis overestimated the combined mesiodistal width of canines and premolars in the upper and lower arches in both genders (p < 0.001), except for the female lower arch, which showed no significant difference between the actual tooth size and tooth size predicted by the Tanaka–Johnston analysis (Table 3)
This study performed an evaluation of a new regression equation for mixed dentition analysis in a Taiwanese population
Summary
The continuous decline in the age of orthodontic patients challenges the ascending significance of mixed dentition space analysis. Space evaluation and tooth size predictions for mixed dentition can help clinicians justify tooth extractions and anchorage decisions in orthodontic treatment plans [3]. Estimation of the mesiodistal width of unerupted permanent canines and premolars is essential for successful diagnosis and treatment planning. The present study aimed to develop a simple linear equation to predict permanent tooth sizes from mixed dentition analysis for Taiwanese people. New regression equations for estimating the dimensions of the unerupted canines and premolars in the Taiwanese population were developed. Conclusions: Using a sample of Taiwanese people, new models derived for females and males separately were developed, which should provide highly accurate predictions for unerupted canines and premolars in the Taiwanese population
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