Validity of Posterior Anterior Cephalometric and 3D-CT for Orbital Canting Analysis

Kim, Jin Wook

Abstract

PURPOSE
The purpose of this study was to estimate validity of posterior anterior cephalometric and 3DCT for orbital canting analysis.
MATERIALS AND METHODS
Three trained observers classified two patients group using standardized frontal photographs of facial asymmetry patients. Group A consisted of patients with facial asymmetry and orbital canting(n=19), and group B consisted of patients with only facial asymmetry(n=43). Orbital canting was measured with line of bilateral inferior orbitale. Orbital canting measurement was done with posterior anterior cephalometric and 3D-CT. Each horizontal reference line was established by bilateral GWSO(cephalometric), FZS(3D-CT). Maxillary canting and mandibular deviation angle were also measured and analyzed with orbital canting.
RESULTS
The mean orbital canting was 3.03+/-1.00 degrees in Group A and 1.11+/-0.76 degrees in Group B in frontal photograph. The mean orbital canting was 1.20+/-0.74 degrees in group A and 1.22+/-0.65 degrees in group B by cephalometric analysis(p>0.05). In 3D-CT, orbital canting was almost paralleled with horizontal reference line. The orbital canting, maxillay canting and mandibular deviation between two groups showed no significant differences except madibular deviation in 3D-CT.
CONCLUSION
Common analysis of posterior anterior cephalometric and 3D-CT is not valide method to evaluate orbital canting for facial asymmetry patients with orbital canting.