Author : Abirami, S.
CORRELATION BETWEEN ANTEGONIAL NOTCH DEPTH, SYMPHYSIS MORPHOLOGY AND RAMUS LENGTH IN DIFFERENT GROWTH PATTERNS OF ANGLE’S CLASS II DIV 2 SUBJECTS
European Journal of Molecular & Clinical Medicine,
2020, Volume 7, Issue 1, Pages 1134-1149
In orthodontics and dentofacial orthopaedics ,thorough knowledge of skeletal and dental components that contribute to Angle’s class II div 2 malocclusion is essential because these elements may influence the approach to treatment.When planning of orthodontic treatment for malocclusion, one has to take into account the growth pattern , because it would considerably affect the success of the treatment. Facial growth and development is important because amount and direction growth will alter the need for orthodontic biomechanics.The aim of this study was to compare between antegonial notch depth, symphysis morphology, and ramus morphology in different growth patterns in skeletal class II div 2 subjects. In this study, lateral cephalograms of 47 skeletal class II div 2 subjects were traced. The sample was divided into average, horizontal, and vertical growth patterns based on jarabak’s ratio. An analysis of variance (ANOVA) test was performed to determine the comparison between groups for all these variables.Pearson correlation coefficient analysis was done to determine correlation between all variables within all the groups. Results showed that Depth of antegonial notch is found to be greater in vertical growth patterns compared to horizontal and average growth patterns. Large symphysis angle and symphysis width is noted in the horizontal growth pattern. Small ramus height is noted in vertical growth pattern compared to horizontal and average growth patterns. In horizontal growth pattern antegonial notch depth was found to be highly correlated with symphyseal angle (r=0.374) and low correlation was found with symphysis width (0.147) and ramus length(r=0.178).In vertical growth pattern , antegonial notch depth was found to be highly correlated with symphyseal angle (r=0.353) and negative correlation was found with ramus length (r = -0.021),symphysis width (r= - 0.676).In average growth pattern , antegonial notch depth was found to be highly correlated with ramus length(r=0.169) and low correlation was found with symphysis width (r=0.033) and negative correlation was found with symphysis angle (r=-0.403).This study concluded that antegonial notch depth ,symphysis morphology and ramus height are significantly correlated with different growth patterns in skeletal class II malocclusion but are highly significant in horizontal growth patterns. All parameters are significantly correlated with different growth patterns.