A calibration of the x-ray technique and a standardization of the digital tracing of both the cephalogram were also performed. The tracing of the cephalogram was standardized between three investigators with 5 x-rays, scanned and traced two times each by each of three of the investigators. To determine the Intratester and intertester reliability, the intraclass correlation coefficient (ICC > 0.3) and Kappa test were applied.