IADR Abstract Archives
Evaluation of Gonial Angle in Panoramic and Cephalometric Radiographs
Objectives: The aim of this study is to compare the measurement of gonial angles in panoramic radiographs and lateral cephalograms of patients with skeletal patterns of class I, II and III.
Methods: In this study 60 patients (38 females, 22 males) from the Institute of Orthodontics of the Faculty of Medicine of the University of Coimbra, were selected. The sample was divided considering the type of skeletal occlusion (Class I, II and III). In the cephalograms, the gonial angle was measured at the intersection of the ascending ramus line and the mandibular plane. In panoramic radiographs, it was calculated by the intersection of two lines, the tangent to the inferior border of the mandible with the tangent to the distal border of the ascending ramus and the condyle on both sides. The data obtained were statistically analysed in the IBM SPSS v.24 statistical platform, with a significance level of 0.05. The ANOVA test was used after testing normality with the Shapiro-Wilk test.
Results: The mean gonial angle was 127.30 ± 8.5 and 128.28 ± 7.8 degrees on panoramic and cephalometric radiographs, respectively. The mean gonial angle in patients with skeletal Class I was 126.3 ± 7.12, with skeletal Class II was 123.7 ± 8.4 and with skeletal Class III was 132.8 ± 6.7.
Conclusions: The gonial angle is an important cephalometric measure in the diagnosis and treatment in Orthodontics. Panoramic imaging is a viable radiological method in cases of poor quality of the lateral cephalometric radiographs.
Methods: In this study 60 patients (38 females, 22 males) from the Institute of Orthodontics of the Faculty of Medicine of the University of Coimbra, were selected. The sample was divided considering the type of skeletal occlusion (Class I, II and III). In the cephalograms, the gonial angle was measured at the intersection of the ascending ramus line and the mandibular plane. In panoramic radiographs, it was calculated by the intersection of two lines, the tangent to the inferior border of the mandible with the tangent to the distal border of the ascending ramus and the condyle on both sides. The data obtained were statistically analysed in the IBM SPSS v.24 statistical platform, with a significance level of 0.05. The ANOVA test was used after testing normality with the Shapiro-Wilk test.
Results: The mean gonial angle was 127.30 ± 8.5 and 128.28 ± 7.8 degrees on panoramic and cephalometric radiographs, respectively. The mean gonial angle in patients with skeletal Class I was 126.3 ± 7.12, with skeletal Class II was 123.7 ± 8.4 and with skeletal Class III was 132.8 ± 6.7.
Conclusions: The gonial angle is an important cephalometric measure in the diagnosis and treatment in Orthodontics. Panoramic imaging is a viable radiological method in cases of poor quality of the lateral cephalometric radiographs.