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Assessment of the impact of tongue size in patients with bimaxillary protrusion.
Int Orthod
June 2013
Department of Child Dental Health, Obafemi Awolowo University Teaching Hospitals, Complex Ile-Ife, Osun State, Nigeria.
Background: Tongue size, posture and pressure are considered to have significant influences on the positioning of dentoalveolar structures. Based on the equilibrium theory, forward resting posture of the tongue with light force and long duration could have both a horizontal and vertical effect on teeth. Bimaxillary proclination, a malocclusion trait often seen in African descents with multifactorial etiological factors, could well be related to tongue dimensions.
View Article and Find Full Text PDFSelf-induced oscillations in an optomechanical system driven by bolometric backaction.
Phys Rev Lett
September 2008
Center for NanoScience and Department of Physics, Ludwig-Maximilians-Universität München, Munich, Germany.
We have explored the nonlinear dynamics of an optomechanical system consisting of an illuminated Fabry-Perot cavity, one of whose end mirrors is attached to a vibrating cantilever. The backaction induced by the bolometric light force produces negative damping such that the system enters a regime of nonlinear oscillations. We study the ensuing attractor diagram describing the nonlinear dynamics.
View Article and Find Full Text PDFUnderstanding, planning, and managing tooth movement: orthodontic force system theory.
Am J Orthod
November 1981
A simple force may cause translation and/or rotation of the tooth upon which it acts. The closer the line of force to the tooth's center of resistance, the greater is the proportion of translation relative to rotation, and vice versa. When a tooth is subjected to a tipping moment, strain is concentrated in the areas of the alveolar crest and root apex.
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