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Overbite and Overjet are not Related to Self-report of Temporomandibular Disorder Symptoms

¹ Department of Prosthodontics, School of Dentistry, Martin Luther University Halle-Wittenberg, Große Steinstr. 19, 06097 Halle/Saale, Germany;
² Department of Preventive Dentistry and Pediatric Dentistry, School of Dentistry, Martin Luther University Halle-Wittenberg, Harz 42-44, 06108 Halle/Saale, Germany;
³ Department of Oral Medicine and Department of Dental Public Health Sciences, School of Dentistry, University of Washington, Health Sciences Bldg., Box 356370, Seattle, WA 98195; and
⁴ Department of Dental Public Health Sciences, School of Dentistry, University of Washington, Health Sciences Bldg., Box 357475, University of Washington, Seattle, WA 98195;

*corresponding author, 4747 30th Ave. NE, #A102,Seattle, WA 98105, USA; mtjohn{at}u.washington.edu

Overbite and overjet, especially high or low values, have been found in some studies to be associated with temporomandibular disorders (TMD). This study evaluates the relationship between overbite/overjet and three TMD self-report measures (pain, joint noises, limited mouth-opening). Subjects were from two population-based cross-sectional studies (3033 subjects). After adjustment for age and gender, high or low values of overbite were not associated with an increased risk of self-reported TMD pain as compared with a reference category of a normal overbite of 2 to 3 mm (-8 to -1 mm, odds ratio = 0.36, 95% confidence interval = 0.05-2.76; 6 to 15 mm, odds ratio = 1.08, 95% confidence interval = 0.68-1.72). Similar non-significant results were found for overjet and TMD pain, and for the association of overjet/overbite and joint noises or limited mouth-opening. This study provides the strongest evidence to date that there is no association between overbite or overjet and self-reported TMD.

KEY WORDS: temporomandibular disorders • dental occlusion • malocclusion • overbite • overjet

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