Differences in four reported symptoms related to temporomandibular disorders in a cohort of 50-year-old subjects followed up after 10 years

OBJECTIVE: To assess possible changes in the prevalence of four temporomandibular disorder (TMD) symptoms reported by subjects at age 50 and again 10 years later. MATERIAL AND METHODS: Identical questionnaires were sent out in 1992 and in 2002 to all subjects born in 1942 and living in two Swedish counties. Of those who answered the four questions on TMD symptoms in 1992, 74% responded in 2002 (n=4639). The response alternatives were dichotomized into two groups: 1) No problems and 2) some, rather severe and severe problems. RESULTS: The mean prevalence of TMD-related symptoms reflected small and mainly non-significant changes, whereas the prevalence of reported bruxism was significantly greater at age 60 than at age 50. Among those with no TMD symptoms at age 50, 5-7% of the men and 8-9% of the women reported symptoms at age 60. Of those reporting one or more TMD symptoms at age 50, 47-65% of the men and 40-48% of the women had no symptoms 10 years later. There was a significant and markedly increased risk of reporting TMD symptoms and bruxism (OR>10) at age 60 among those who had symptoms at age 50. CONCLUSIONS: The mean prevalence of reported TMD symptoms was relatively consistent from age 50 to age 60. The group reporting symptoms at the first examination were highly likely still to have the symptoms 10 years later. However, approximately half of the subjects with TMD symptoms at age 50 reported no symptoms at age 60