Abstract: Objective　 To investigate the inspection effect of a clinical cant detective method by comparing the bilateral vertical distances from the pupil midpoint to the transverse occlusal plane. Methods　Forty-nine patients participated in the study. For physical examination, the clinical cant was determined by calculating the abstract difference between bilateral vertical distance from the pupil midpoint to the transverse occlusal plane. The skeletal cant was measured from three different landmarks around the orbit. After CBCT was taken, Ior cant, FZ cant and Sor cant were calculated for the absolute difference of vertical distances from the specific landmarks to the U6. If the cant value was equal to or greater than 2 mm, this cant was regarded as positive. The golden standard of existing cant is two out of three skeletal cants reaching or passing 2 mm (CBCT cant(+)). By comparing the clinical cant with the skeletal cants, the accuracy of this clinical method was evaluated. Results　 The overall CBCT cant positive rate was 49.0% with clinical cant positive rate 53.1%. McNemar test revealed no significant difference between the clinical cant and the CBCT cant (P=0.754). Consistency check showed Kappa=0.592±0.115, with medium consistency. Conclusion　 The cant detective method based on pupil midpoint can be used as a screen examination, but for the real cant diagnosis the CBCT measurements are necessary.

Key words: dentofacial deformity, transverse occlusal plane, clinical measurement