2478 Non-functional tooth contacts in controls and myogenous masticatory pain patients
C.Y. CHEN, S. PALLA, S. ERNI, M. SIEBER, and L.M. GALLO, University of Zurich, Switzerland


Clenching during wake time has been considered an etiological factor for myoarthropathies of the masticatory system (MAP), i.e. craniomandibular disorders, especially for the myogenous ones. The study investigated how often healthy controls and patients with myogenous masticatory pain have wake time non-functional tooth contacts and tested whether the frequency of non-functional tooth contacts differed between gender, between weekdays and weekends and whether it was influenced by stress levels.


The study was performed on 24 subjects: 15 controls and 9 patients. During 10 days the subjects were alerted by means of a radio wave-activated wrist-vibrator approximately every 20 minutes (08:00 AM to 10:00 PM) in order to report whether the teeth were in contact. Before data collection the subjects were trained to ascertain their ability to correctly feel if teeth were in contact or apart. Subjects also completed two stress assessment questionnaires, the Perceived Stress Scale (PSS) and the short version of the Trier Inventory for Assessment of Chronic Stress (TICS-S). Non-parametric statistical tests were performed and corrected according to Bonferroni in case of repeated tests.


Myogenous pain patients had significantly more often wake time non-functional tooth contacts than controls (median 34.9%, range 26.5 to 41.3% vs. 8.9%, range 2.3 to 14.3%, p < 0.001). In both groups the frequency of non-functional tooth contacts did not differ among the various week days. The patients had significantly higher PSS scores and reported to have experienced more stressful situations in the dimensions “social overload” and “overextended at work” than the controls, but in both groups the PSS and TICS-S scores did not correlate with the frequency of non-functional tooth contacts.


Myogenous pain patients had close to four times more non-functional tooth contacts during wake time than controls.

Seq #257 - TMD: pain reporting, non-functional jaw activity and mechanisms
9:00 AM-10:30 AM, Saturday, March 24, 2007 Ernest N. Morial Convention Center 386

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