Abstract:

Objective

The study aimed to assess the distribution of temporomandibular disorders （TMD） sub-types in Chinese people seeking treatment for TMD.

Methods

Clinical data of the TMD patients were collected and analyzed by using the Research Diagnostic Criteria for TMD（RDC/TMD）. Three sub-types of TMD （Group 1， muscle disorders； Group 2， disc displacements and Group 3， arthralgia， arthritis， arthrosis） were measured.

Results

A total of 142 TMD patients were surveyed and examined clinically. There were 133 valid scales and 9 missed. In this study 38 men and 95 women with the ratio of 1 ∶2.5 were involved. Patients suffered from TMD were commonly found in the age between 18 and 44. 67.7% of TMD patients received college education， and 84.2% TMD patients' monthly income were below 5000 yuan. The results of the axis I diagnosis indicated that the prevalence of Group 1 was 16.5%. In Group 2， the incidence of disc displacement in the left temporomandibular joint was 37.2% and in the right 27.3%. The disc displacement with reduction was particularly common. The prevalence of Group 3 was 43.0% in the left temporomandibular joint and 38.9% in the right. The arthralgia was common in patients of this group.

Conclusions

Disc displacement with reduction and arthralgia were more common in these TMD patients.

Key words: Temporomandibular disorders, Research diagnostic criteria for temporomandibular disorders, Axis Ⅰ, Clinical assessment