Table 1: Characteristics of the two symmetry evaluation methods described in the literature.

Method 1 (Al-Zubair, 2014)	Method 2 IXS index (Mutinelli, 2006)
Three points in each arch side (left and right)	Four points
Three linear measurements in each arch side (left and right)	Four linear measurements
Correlation and comparison between left and right sides	No comparison and correlation between left and right sides
No mathematical equation	Mathematical equations
Suitable to maxillary and mandibular arches	Suitable to maxillary and mandibular arches
Detects asymmetry according to the distances	Do not detects the asymmetry distances
Three values in each arch side, according to linear measurements	A single value resulting from the mathematical symmetry equation