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Abstract
IntroductionThe aims of the study were; to evaluate the applicability of the Moyers and Tanaka-Johnston Methods to individuals with a Spanish ancestry, to propose new regression equations using the lower four permanents incisors as predictors for the sum of the widths of the lower permanent canine and premolars, and to compare the new data to those from other populations.MethodsA total of 359 Spanish ancestry adolescents were selected. Their dental casts were measured using a 2D computerized system. Real teeth measurements were compared with those predicted using Moyers probability tables and Tanaka and Johnston equations, and standard regression equations were then developed.ResultsResults showed that Upper and Lower Canine and Premolar (UCPM, LCPM) predictions are quite different depending on the used method. Moyers tables can only be validly applied to a 75% percentile for the mandible in both, males and females, 85% in males and 90-92% in females.ConclusionsMoyers predictions tend to underestimate UCPM and LCPM whereas Tanaka-Johnston predictions tend to overestimate them. Equations for estimating the combined width of the unerupted canine and premolars were; Male: UCPM = 12.68 + 0.42 LI and LCPM = 11.71 + 0.44 LI. Female: UCPM = 12.06 + 0.43LI and LCPM = 10.71 + 0.46 LI.
Highlights
The aims of the study were; to evaluate the applicability of the Moyers and Tanaka-Johnston Methods to individuals with a Spanish ancestry, to propose new regression equations using the lower four permanents incisors as predictors for the sum of the widths of the lower permanent canine and premolars, and to compare the new data to those from other populations
Both Moyers’ regression scheme [2] and Tanaka and Johnston’s equations [3] have achieved widespread clinical acceptance because of their simplicity and ease of application. 2- Analyses based on measurements taken from radiographs [4,5] of unerupted teeth. 3- Analyses based on a combination of correlations and regression equations and measurements on radiographs [6,7,8]
Odontometric data from Spanish ancestry children are not so widely available and, to date, there is no study in the literature examining the accuracy of Moyers probability tables and Tanaka and Johnston equations in predicting the size of unerupted canines and premolars in a Spanish ancestry sample
Summary
The aims of the study were; to evaluate the applicability of the Moyers and Tanaka-Johnston Methods to individuals with a Spanish ancestry, to propose new regression equations using the lower four permanents incisors as predictors for the sum of the widths of the lower permanent canine and premolars, and to compare the new data to those from other populations. The aims of the present study were, to evaluate the applicability of the Moyers and Tanaka-Johnston methods to Spanish ancestry individuals; to propose new regression equations using the lower four permanent incisors as predictors of the sum of the widths of the lower and upper permanent canine and premolars; and to compare the new data with those of other populations
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