OPG analysis. Measurement of condylar height symmetry: the most lateral point of the condyle (X) and the ramus (Y) are individuated, and a line passing through these points (A) is drawn. Then, a line (B) passing through the most superior point of the condyle and perpendicular to A is traced. Condylar height (CH) is the distance in mm between X and the intersection of A and B (Z).