title: Equilibrium situations in bend force systems.
abstract: This article provides a simple theoretical approach to the equilibrium situations encountered in biomechanics. Basic differences between the moment of a force and the moment of a couple are described. The concept of the center of resistance is defined and applied to the case of a force system (Rs). Three equilibrium situations are schematically described: the off-center V bend, the centered V bend, and the step bend. Two clinical examples are detailed (one from the Begg technique and one from the Ricketts technique) to demonstrate clinical applications of force in these three situations.
authors.affiliation: Faculté d'Odontologie de Lyon, France.
authors.forename: C
authors.initials: C
authors.lastname: Demange
mesh_terms: D001696:Biomechanical Phenomena; D003799:Dental Stress Analysis; D006801:Humans; D009967:Orthodontic Appliances; D009969:Orthodontic Wires; D014087:Tooth Movement Techniques