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Original Article

Variable prescription in orthodontics: what every orthodontist should know

2010, Volumen 40, Número 2
César Ventureira Pedrosa
Doctor por la Universidad Autónoma de Madrid, Odontólogo (UCM). Posgraduado en Ortodoncia por la Fundación Jiménez Díaz. Docente del Máster de Ortodoncia de la Universidad CEU San Pablo y del Posgrado de Ortodoncia de la Fundación Jiménez Díaz. Madrid

The purpose of this paper is to analyze the current situation of variable prescription in orthodontics. The origins and the several factors affecting the expression of torque and effective angulation, emphasizing its clinical impact, are described. These factors are related to: 1) the manufacture of wire (alloy, edges beveled, torsional rigidity) and the bracket (irregularities in slot, dimensions, material composition); 2) the tie method (elastic or metal ligatures, active or passive self-ligating systems); 3) the professional performance (errors in bracket placement), 4) the tooth morphology (shape and irregularities of its surface). All these factors must be known and taken into account by the orthodontist for variable prescription to make sense. It’s also discussed the variable prescription clinical applications by presenting cases and clinical situations. They are influenced by the bracket selection protocols of the different torques, depending on variables such as the type of malocclusion, the individual position of each tooth at baseline and orthodontic mechanics  (Rev Esp Ortod. 2010;40(2):093-108)

Key words:
Variable prescription. Torque. Angulation. Self-ligating brackets.
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