Comparison of Accuracy of Gonial Angle of Orthopantomogram and Lateral Cephalogram for Mandibular Measurements among Orthodontic Patients Attending Tertiary Care Dental Hospital in Kathmandu

Authors

  • Vikash Veer Shrestha, Dr Nepal Medical College and Teaching Hospital
  • Ansu Piya, Dr Nepal Medical College and Teaching Hospital
  • Anju Khapung, Dr Nepal Medical College and Teaching Hospital
  • Prakash Bhattarai, Dr Nepal Medical College and Teaching Hospital

DOI:

https://doi.org/10.3126/ojn.v10i3.35497

Keywords:

Gonial angle, Lateral cephalometric radiograph, Orthopantamogram

Abstract

Introduction: Gonial angle is an important parameter of the craniofacial complex which is generally used to evaluate the vertical parameters and symmetry of the facial skeleton. Gonial angle can be measured in both orthopantomogram (OPG) and lateral cephalograms. Due to the superimpositions seen while measuring the bilateral strucuture on lateral cephalograms, reliable measurement of the gonial angle becomes difficult. This study is done to clarify the possible application of orthopantomogram (OPG) for evaluating angular measurement of the mandible specifically gonial angle by comparing with lateral cephalogram.

Materials and Method: All the patients (104) being treated from January 2018 to August 2020 in department of Orthodontics in Nepal Medical College were included in the study. Gonial angle measurements were made on lateral cephalograms and orthopantomograms of 104 patients – 54 males and 50 females with mean age of 22.20 ± 3.25 years. Patients aged 15-35 years were included in the study. Data was processed in SPSS version 16.0.

Result: Mean Gonial angle in lateral cephalogram was greater than mean gonial angle in OPG and this difference was found to be statistically significant (p-value < 0.05). The difference in mean gonial angle was found to be statistically significant when compared between right gonial angle in OPG and gonial angle in lateral cephalogram (p-value < 0.05) and also between left gonial angle in OPG and gonial angle in lateral cephalogram (p-value < 0.05).

Conclusion: When gonial angle values obtained from both sides of OPG were compared, no statistically significant difference was found. Significant differences were found when gonial angle values obtained from OPG right and left sides were compared with that of lateral cephalogram.

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Author Biographies

Vikash Veer Shrestha, Dr, Nepal Medical College and Teaching Hospital

Department of Orthodontics and Dentofacial Orthopaedics, Assistant Professor

Ansu Piya, Dr, Nepal Medical College and Teaching Hospital

Department of Orthodontics and Dentofacial Orthopedics, Associate Professor

Anju Khapung, Dr, Nepal Medical College and Teaching Hospital

Department of community and public health dentistry, lecturer

Prakash Bhattarai, Dr, Nepal Medical College and Teaching Hospital

Department of Orthodontics and Dentofacial orthopedics, Professor

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Published

2020-12-31

How to Cite

Shrestha, V. V., Piya, A., Khapung, A., & Bhattarai, P. (2020). Comparison of Accuracy of Gonial Angle of Orthopantomogram and Lateral Cephalogram for Mandibular Measurements among Orthodontic Patients Attending Tertiary Care Dental Hospital in Kathmandu. Orthodontic Journal of Nepal, 10(3), 57–61. https://doi.org/10.3126/ojn.v10i3.35497

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Original Articles