Relationship between facial asymmetry and positional plagiocephaly analyzed by three-dimensional computed tomography

A relationship between positional cranial deformation and facial asymmetry has been suggested; however, details regarding this relationship remain to be clarified. This study aimed to elucidate the relationship between facial asymmetry and positional plagiocephaly using three-dimensional computed tomography (3D-CT). One-hundred-and-twenty-nine patients were included, and cranial vault asymmetry index (CVAI) and cephalic index (CI) were used as indicators of positional cranial deformation. Temporal muscle was constructed using 3D-CT data, and its volume was measured. VRL, Me (vertical reference line (VRL)-anterior nasal spine (ANS) and menton (Me) line) angle and the frontal occlusal plane (FOP) angle were measured. CVAI and VRL, Me angle (R2 = 0.31, P