The relationship between bruxism and temporomandibular joint dysfunction as shown by computer analysis of nocturnal tooth contact patterns

Abstract

Whilst there are many causes of temporomandibular joint dysfunction, one of the most frequently encountered is bruxism. The two conditions have many aetiological factors in common and there is a rational physiological reason why bruxism could cause temporomandibular joint dysfunction. In fact, experimental bruxism performed under laboratory conditions has been found to cause such joint dysfunction. This contention is supported by direct measurements of nocturnal tooth contact. Patients with temporomandibular joint dysfunction were found to differ from control subjects to a degree which was statistically significant.

Biomechanical considerations on tooth-implant supported fixed partial dentures

“…A study has shown that subjects with parafunctional activities occlude their teeth seven times longer than those with no such habits (38.7 min vs 5.4 min). 143 …”

Isometric endurance of masseter muscle in children

“…Finally, in human subjects who grind and clench their teeth during sleep, Trenouth (1979) found that the teeth made contact for about 5 s/min of sleep. Provided that high levels of tension are generated and that tooth clenching occurs, children might totally exhaust their jaw muscles within 15-25 min of sleep (Christensen, 1980b, d).…”

Temporomandibular joint dysfunction syndrome and myofascial pain dysfunction syndrome: a critical review

“…In a better controlled study, Trenouth (1979) compared three groups of subjects: a TMJ/bruxism group consisting of nine patients; a TMJ/non-bruxism group composed of six patients; and a non-TMJ/non-bruxisin group of ten student volunteers. The diagtiosis of TMJ dysfunction syridrotne was made on the criteria proposed by Laskin (1969) while bruxism was diagnosed on the basis of criteria proposed by Franks (1965a).…”

“…Nocturnal bruxism studies should employ an operational definition consisting of rhythmical bursts of EMG activity. The use of groups similar to Trenouth's (1979) TMJ/bruxism, TMJ/non-bruxism and non-TMJ/non-bruxism groups is suggested for an adequate evaluation of nocturnal bruxism frequency and duration. The assessment of diurnal bruxism and TMJ/ MPD problems is more difficult due to the possible reactivity associated with any assessment technique.…”