Evaluation of the reliability of mixed dentition analysis on a sample population from the Northeastern part of Karnataka, India:A comparative study.

Abstract

BACKGROUND Most of the universally accepted and currently used mixed dentition analyses arebased on the data derived from studies northwestern European descent. However the reliability of these methods when applied to different ethnic populations is questionable.nbsp OBJECTIVES To evaluate the applicability of Moyers 50th and 75th percentile and Tanaka and Johnston TJ mixed dentition analysis in a sample of children from north eastern part of Karnataka India. MATERIALS ANDMETHODS Study models were prepared from a sample of 100 patients 50 males and 50 females in the age range of 13 to 15 years. The mesiodistal dimension of the teeth was measured using a digital Vernier calipers. Moyers and Tanaka - Johnstons mixed dentition arch analysis were calculated. The actual values of permanent canine and premolars on the casts were compared with the predicted values from TJ and Moyers analysis. ANOVA test Pearsons coefficient tests and simple regression analyses were used.RESULTS Overestimated values were noticed in males and females forboth arches with TJ equation at Moyers 75th percentile at Moyers 50th percentile 50100 underestimated values were observed in both the arches. Conclusion The values showed significant deviation from TJ and Moyers both at 50 and 75 percentile its applicability to the present population is limited. Hence new regression equations were derived.nbsp