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  • Title: Age and third molar extraction as risk factors for temporomandibular disorder.
    Author: Huang GJ, Drangsholt MT, Rue TC, Cruikshank DC, Hobson KA.
    Journal: J Dent Res; 2008 Mar; 87(3):283-7. PubMed ID: 18296615.
    Abstract:
    This study investigated third molar removal as a risk factor for temporomandibular disorder (TMD) in all age groups. We compared 2217 Kaiser Permanente Northwest health plan enrollees with a history of third molar extraction with 2217 age-and gender-matched enrollees with radiographic confirmation of no lifetime third molar removal. Common Dental Terminology codes were used to identify information on third molar removal, and International Classification of Disease codes were used to identify TMD. Relative risks were calculated overall, and by each decade of life, in univariate and multivariate analyses. The incidence of TMD in subjects with and without third molar removal were 7 and 5 per thousand person-years, respectively. Third molar removal among subjects of all ages resulted in a statistically insignificant increased relative risk for TMD (1.4, 95% confidence interval (CI): 0.9-2.2). The relative risk was slightly higher in those under 21, but was also not statistically significant (1.6, CI: 0.8-3.1).
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