Abstract
Objective: To develop and propose a new regression for mixed dentition analysis in Chhattisgarh, Central India population. Material and Methods: The permanent dentition dental casts of 800 (400 males and 400 females) Chhattisgarh subjects were selected. Digital caliper was used to measure the mesiodistal crown widths of teeth. The linear regression equations and correlation between four mandibular incisors and the canine-premolars segments of maxillary and mandibular arches were developed (modified Tanaka-Johnston equation) and proposed for Chhattisgarh population. Results: New standardized regression equations were formulated to predict the mesiodistal widths of unerupted canines and premolars especially for Chhattisgarh, Central India population. The equation in males for maxillary arch was Y = 11.90 + 0.39 (X) and for mandibular arch was Y = 12.23 + 0.36 (X). Similarly, the equation in females for maxillary arch was Y = 14.40 + 0.26 (X) and for mandibular arch was Y= 10.26 + 0.43 (X). A significant sexual dimorphism in teeth sizes was seen with higher mesio distal dimension in males in Chhattisgarh population. Conclusion: Sum of the mesiodistal diameter of permanent mandibular incisors can be used reliably to predict/estimate the sum of mesiodistal diameters of unerupted canines and premolars with the new regression equations.
Highlights
The inconsistency between the tooth size and the tooth arch space is the condition, which requires early attention
New standardized regression equations were formulated to predict the mesiodistal widths of unerupted canines and premolars especially for Chhattisgarh, Central India population
Three main approaches used in mixed dentition analysis can be classified into three groups: a) based on measuring the unerupted teeth on the radiographs [1,3,4], b) based on usage of regression equations that relate the widths of erupted teeth in the oral cavity to the widths of unerupted teeth [5,6] and c) blend of measurements from erupted teeth and radiographs of unerupted teeth [7,8,9]
Summary
The inconsistency between the tooth size and the tooth arch space is the condition, which requires early attention. Most common method to predict/estimate the mesiodistal dimensions of unerupted canines and premolars have been decided by Tanaka and Johnston method by measuring the erupted permanent mandibular incisors [5] or calculated using Moyers probability charts [6]. These prediction/estimation techniques were developed using a population of “probable” North European ancestry. The present study aims to determine linear regression equations to predict/estimate the sum of mesiodistal width of unerupted permanent canines and premolars in the Chhattisgarh, Central India population by using the sum of four permanent mandibular incisors
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