Correlation between the submental vertex and condylar position indicator values

Abstract

When we take Oriented Tomogram, We beforehand take the submental vertex (SMV), and we calculate the measurement values from it. We examined the correlation between that measurement values and the measurement values of the difference of the condylar head position that the clinical CR bite called power centric bite and the CO bite in centric occlusion make. The subjects were 109 patients (25 males and 84 females) who wished to have orthodontic treatment with an average age of 17.3 years (8〜36 years old). In result, we found that the condyle angle and offset distance had a significant correlation with the y-axis value of the condylar position indicator (CPI). This measurement values of SMV show the big value in the patients with temporomandibular disorders. On the other hand, it suggested that temporomandibular disorder is related to dislocation of condylar head because the value of the Y-axis of CPI is related to subluxation of condylar head. These result suggest that CPI screening shoud be done for patients with temporomandibular joint problems before starting orthodontic treatments.