Importance of Success Criteria in the Validity of Panoramic Radiograph for Measurement of Gonial Angle

Introduction: The size of the gonial angle depends on the method of measurement being used. It can be measured on both \npanoramic and cephalometric radiographs. The study aims to find the effect of the success criteria of a panoramic radiograph on \nits validity to evaluate the gonial angle. \nMaterials and methods: Lateral cephalometric and dental panoramic radiographs of 76 individuals of both genders with age range \nfrom 12 to 25 years were included in this study. The samples divided into two groups: The first group included 36 samples with \nnon-evaluated panoramic radiographs having good quality and sharpness. The second group included 40 samples of evaluated \npanoramic radiographs, which were selected according to the specific criteria of success. A paired t-test was used for evaluating \nthe difference between the gonial angle in the lateral cephalometric and panoramic radiographs of both sides. A p-value ≥ 0.05 \nwas considered to be statistically insignificant. \nResults: The findings of the study showed a significant difference in the values of the gonial angle between the non-evaluated \npanoramic radiographs of right and left sides (p=0.00, 0.001) respectively as compared to the cephalometric radiograph. No \nsignificant differences observed in the value of gonial angle measurements. They were obtained from cephalometric and evaluated \npanoramic radiographs of both sides (p=0.888, 0.938) respectively. \nConclusion: The success criteria could serve as an easy and simple method to assess the quality of panoramic radiographs for \naccurately measuring the gonial angle on both sides and without superimposition as compared to cephalometric radiographs.