A Retrospective Study on variations In Chin-Throat Angle in Different Skeletal Malocclusions

Abstract

OBJECTIVE: To assess the variations in Chin Throat Angle in different skeletal malocclusions in local population reported to Madha dental college and hospital.MATERIALS & METHODS: Profile photographs and lateral cephalograms of 102 adults aged between 18-28 years were taken, out of which 75 were class I, 23 were class II and  4 were class III malocclusions. All the samples were digitalized and standardized and ANB and Chin Throat Angles were measured. The pre-treatment measurements were   compared in between these three groups. The Statistics  included normality test, Kolmogorov-Smirnov and    Shapiro-Walks tests, parametric test, one way ANOVA and independent t-test for group differences.RESULTS: Chin Throat Angle was increased in class II group than that of class I and III groups. Significant differences     (P< 0.05) were observed for ANB and Chin Throat Angle between Classes I/II/III as (<0.01) & (<0.036) respectively on lateral cephalograms. On profile photographs Chin Throat Angle between the three classes were significant (<0.027).CONCLUSION:  The Chin Throat Angle analysis is essential for the orthodontist’s awareness of treatment planning and can also be used for explaining to the patient.  Thus not only frontal photographs but also lateral cephalograms along with profile photographs plays an important role in diagnostic   purposes.