Exploration of temporomandibular disc perforation with cone beam computed tomography arthrography diagnosis

Abstract

Objectives To explore the relationship of anterior disc displacement, disc perforation and condyle bone defect. Methods A total of 96 cases of osteoarthrosis (145 sides of temporomandibular joint) from Hospital of Stomatology, Sun Yat-sen University, were included and undertook cone beam computed tomography arthrography (CBCT) . They are classified into Perforation Group and Non-perforation Group. The disc displacement and types of perforation were analyzed with Pearson χ2 method, and the bone defect types between two groups were compared with χ2 analyses using SPSS 18.0 software. Results Anterior disc displacement was shown in all the joints, among which 123 cases were anterior disc displacement without reduction, and 22 cases were anterior disc displacement with reduction. Disc perforation was confirmed by arthrography in 86 cases. Significant correlation (χ2= 6.866, P= 0.015) was found between the types of the anterior disc displacement and the groups of Perforation or Non-perforation. In the Perforation Group, the incidence of anterior disc displacement without reduction (91.86%) was greater than that in the Non-perforation Group (76.3%) . Conclusions The disc displacement can happen in the disc perforation cases. And the types of disc displacement are correlated with the perforation, while the type of condyle bone defect show no significance correlation with the perforation. Key words: Temporomandibular joint; Osteoarthrosis; Disc perforation; Anterior disc displacement