Aims: The aim of the present study is to compare the measurement of gonial angles and vertical ramal length (both right and
left) from OPG with the gonial angle and vertical ramal length measured from lateral cephalograms in a mixed Indian Population
with Class I, II & III malocclusion.
Settings and Design: The retrospective cross‑sectional diagnostic study was conducted after obtaining due approval from the
institutional ethical committee.
Methods and Material: Gonial angle and ramal length was measured from 57 OPG and lateral cephalogram of orthodontic
patients (26 females and 31 males). The patients were a heterogeneous group comprising of individuals from pan India.
Statistical analysis used: The analyses of descriptive statistics, reliability, analysis of variance and correlation was conducted
with SPSS 20.0, IBM. The means based on malocclusion classes were compared using one-way analysis of variance (ANOVA)
followed by comparison of correlation values using Pearson correlation. Gender differences were also compared using T-test. Post
Hoc analysis could not be carried out due no statistically significant difference found through ANOVA.
Results: There was no statistical difference in the measurements of gonial angle made from OPG as compared to the same
measurements made from a lateral cephalogram.
Conclusions: In addition to the conventional method of measuring the gonial angle and ramal length, OPG may also be used for
their accurate measurement.