Applicability of different mixed dentition analysis in Lucknow population

Area of Science:

• Dentistry
• Orthodontics
• Anthropology

Background:

• Moyer's and Tanaka-Johnston methods for mixed dentition analysis were developed using North European populations.
• Applying these methods to different ethnic groups may yield questionable results.
• This study addresses the need for population-specific analysis in the Lucknow region.

Purpose of the Study:

• To assess the reliability of Moyer's and Tanaka-Johnston mixed dentition analysis in the Lucknow population.
• To develop new linear regression equations for predicting canine and premolar mesiodistal widths in this demographic.
• To provide a more accurate tool for orthodontic treatment planning.

Main Methods:

• Actual mesiodistal widths of permanent teeth were measured on 100 dental casts using a digital Vernier caliper.
• Predicted values were obtained using Moyer's 75th percentile analysis and the Tanaka-Johnston method.
• Statistical analysis included student's t-test and unpaired t-test to compare actual and predicted values.

Main Results:

• Statistically significant differences (P < 0.05) were found between actual and predicted tooth widths for both sexes using Moyer's and Tanaka-Johnston methods.
• Four linear regression equations were derived for males and females to predict canine and premolar widths based on lower incisor measurements.
• The newly developed regression equations showed no significant differences when applied to the study sample.

Conclusions:

• Moyer's and Tanaka-Johnston methods showed limited reliability for the Lucknow population.
• The developed linear regression equations demonstrated good agreement with actual measurements in the Lucknow population.
• These new equations offer a more accurate approach for mixed dentition analysis in this specific ethnic group.