title: Posterior and anterior components of force during bite loading.
abstract: Late anterior crowding of teeth has been associated with the anterior component of force (ACF) developed during biting. Possible physiologic mechanisms countering ACF, including the presence of a posterior component of force (PCF), are hypothesized. In this self-controlled study, 60 subjects aged 27.05+/-3.9 years were examined for ACF and PCF that were calculated as the change in tightness of a mandibular dental contact points from non-biting to biting state. Both ACF and PCF were found to develop simultaneously. However, the PCF was 4-7 folds smaller than the ACF (p<0.001). The ACF progressively declined by 10-20 folds (p<0.001) from the posterior to anterior dentition. The lateral incisor-canine contact point had the greatest ACF decline (63-74%). ACF effect on the anterior dentition is counteracted by a protective mechanism consisted of PCF, progressive dissipation of ACF, and canine blockage.
authors.affiliation: Department of Orthodontics, The Maurice and Gabriela Goldschleger, School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. andyva@post.tau.ac.il
authors.forename: A D
authors.initials: AD
authors.lastname: Vardimon
authors.forename: S
authors.initials: S
authors.lastname: Beckmann
authors.forename: N
authors.initials: N
authors.lastname: Shpack
authors.forename: O
authors.initials: O
authors.lastname: Sarne
authors.forename: T
authors.initials: T
authors.lastname: Brosh
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001732:Bite Force; D003766:Dental Occlusion; D003799:Dental Stress Analysis; D006801:Humans; D008334:Mandible / Q000502:physiology*