Analysis of Condylar Movement Trajectories in Patients with Temporomandibular Joint Disc Displacement

doi:10.13701/j.cnki.kqyxyj.2022.02.018

Abstract

Abstract: Objective: To explore the effect of disc displacement on condylar movements in patients with temporomandibular joint disc displacement. Methods: Eighteen patients with bilateral disc displacement without reduction (DDwoR), 18 patients with bilateral disc displacement with reduction (DDwR), and 10 healthy controls (HC) were included. The trajectories of the condylar hinge axis when doing opening-closing and protrusive-retrusive movements were recorded by computer aided diagnosis axiograph, respectively. The maximum displacement of condyle (Smax), the sagittal condylar track inclination when condylar displacement was 5mm (SCI5), the sagittal condylar track inclination when condylar displacement was maximum (SCI), and reproducibility of condylar movement on the sagittal plane (R) were calculated. Variance analysis was used to compare the differences among the three groups. Results: During opening-closing movement, Smax and SCI5 in DDwoR group were significantly lower than those in DDwR group and HC group. SCI of DDwR group was lower than that of DDwoR group and HC group while R of DDwR group was significantly greater than that of DDwoR group and HC group. When doing protrusive-retrusive movement, the SCI5 and SCI in DDwoR group were significantly lower than those in DDwR group and HC group. The R of DDwR and DDwoR group was significantly higher than that of HC group. Conclusion: The condylar movement trajectories of patients with different types of disc displacement have different characteristics, providing reference for clinical diagnosis and treatment of temporomandibular joint disc displacement.

Key words: temporomandibular disorder, condylar movement, computer aided diagnosis axiograph

ZHOU Yanli, ZHOU Weina, YU Linfeng, WANG Chen, WANG Bingjie, ZHANG Jinglu. Analysis of Condylar Movement Trajectories in Patients with Temporomandibular Joint Disc Displacement[J]. Journal of Oral Science Research, 2022, 38(2): 186-190.

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