Is There Any Difference Between Gonial Angle Values Measured on Digital Lateral Cephalograms and Orthopantomograms?

Özet

Objective: To determine whether there is a difference between the gonial angle (GoAng) values measured on digital lateral cephalograms (Lat Cephs) and orthopantomograms (OPGs) using a software.Methods: This study was conducted by examining the digital Lat Cephs and OPGs of 51 patients (9 males, 42 females) who receivedorthodontic treatment. The mean age of the patients was 19.51±4.92 years. All digital radiographs were acquired with the same machine. The GoAng measurements were performed digitally using TotalCeph software. In order to evaluate the difference between theGoAngs measured on the digital Lat Cephs and OPGs, a paired t-test was used. To compare the two techniques (digital Lat Ceph andOPG) in terms of GoAng measurement, Bland-Altman analysis was used. The differences between the right and left GoAngs measuredon the digital OPGs were evaluated using a paired t-test. The intraobserver reliability was assessed with the intraclass correlationcoefficient (ICC) for repeated measurements.Results: The intraobserver reliability was 0.99 for repeated measurements. There were no statistically significant differences betweenthe GoAngs measured on digital Lat Cephs and OPGs (p=0.1). Bland-Altman analysis showed high levels of agreement betweendigital Lat Cephs and OPGs with a bias value of −0.4° for GoAng measurement. Moreover, the differences between the right and leftGoAngs measured on the digital OPGs were not statistically significant (p=0.73).Conclusion: The results of this study demonstrated that the digital OPGs were as reliable as the digital Lat Cephs for measuring Goangles using a software.