Overjet in adolescents with class II division 1 malocclusion-A retrospective cross sectional study

Abstract

Overjet is the horizontal distance between labial surfaces of maxillary and mandibular incisors. Normal overjet is 2-3 mm. Overjet greater than 3 mm and less than 1 mm are considered as sagittal discrepancies. An increased overjet is commonly seen in Class II malocclusions and is one of the most common complaints among patients reporting for orthodontic treat-ment. The aim of the study was to evaluate the severity of overjet in adolescents with class II division1 malocclusion. Patient records from Saveetha Dental College were retrieved and screened for data on Class II div I malocclusion. Patients aged from 12 to 18 with Class II div I malocclusion were included in the study. 210 records were randomly selected based on inclusion criteria.Severity of overjet was assessed from photographic records and categorised as Group A (N=79) (severe), Group B(N= 61) (moderate)and Group C (N=70) (mild). The tabulated data was imported into SPSS and analysed. The results of the study showed that 37.62% of the entire sample population had severe overjet. Among the genders 22.38% of males and only 15.24% of females had severe overjet. Severe increase in overjet was seen in 13 year olds. Pearson's chi square value of 0.359 and p value (0.836) showed poor association between gender and overjet. Pearson's chi square value of 14.66 and p value (0.145) showed poor association between age and overjet. From the results of the study it can be concluded that severe increase in overjet is seen only in 37.62% of the sample population without any association with gender or age.