Longitudinal Assessment of Maxillary and Mandibular Molar and Incisor Dentoalveolar Heights and Growth Rates in Class I Subjects with Varied Craniofacial Growth Patterns as Classified by Directional and Proportionate Methods

Abstract

Objective: To determine if significant differences exist in dentoalveolar heights and dentoalveolar height growth rates, among skeletal Class I subjects that exhibit differing craniofacial growth patterns.Methods: One hundred and five subjects with cephalograms available at 9, 12, 14, and 16 years were categorized into directional (change in Y-axis angle) and proportionate (UFH:LFH) growth pattern groups. Maxillary and mandibular molar and incisor dentoalveolar heights and dentoalveolar height growth rates were determined. Comparisons were made by mixed model and ANOVA.Results: Neither dentoalveolar heights, nor growth rates differed significantly among directional classification groups in either gender. All dentoalveolar heights differed significantly among all proportionate classification groups at all ages in both male and female subjects. Conclusions: No statistically significant differences were found in dentoalveolar heights or dentoalveolar height growth rates of different directional growth pattern groups. Statistically significant differences were found in all dentoalveolar heights of different proportionate growth pattern groups.M.Sc