There has been considerable controversy over the years regarding the importance of psychological factors in the diagnosis, etiology, progression and response to treatment in the field of temporomandibular disorders (TMDs). Few studies have looked carefully at the influence of psychological factors on different components of TMDs. For example, on disorders primarily involving the TM joint versus those involving primarily the muscles and soft tissues. The study described below offers some interesting insight into this question.
"TMD Treatment Outcomes: A Statistical Assessment of the Effects of Psychological Variables"
Dr. Pamela Steed, DDS, MSD
Jour of Craniomandib Practice, (16)3: 138-42, 1998
This study analyzes the degree to which pretreatment psychosocial factors (psychological dysfunctions and stress) effect outcome in 269 consecutive temporomandibular disorder (TMD) patients at the completion of treatment. Employing the TMJ Scale, a validated measure of TMD symptoms, it is found that pretreatment TMD pain and overall symptom levels (excluding internal derangement symptoms) are weakly but nevertheless, significantly related to pretreatment psychological dysfunction and stress. However, the latter appeared totally unrelated to four treatment outcome measures. Additionally, the data supports the hypothesis that both initial and post-treatment intrascapular symptoms (TMJ Scale, Joint Dysfunction sub-scale) are unrelated to psychosocial factors. Data from this study call into question the value of categorizing the TMD patients by means of psychosocial "profiling" and "dual-axis" classification methods proposed by some researchers.