The aim of this article is to explain the main factors that influence orthodontic treatment efficacy and are included in the
term “friction”. Most studies have developed this subject in a scientific point of view. This article pretends to bring out a clinical
approach of all these findings in literature about “friction”. Brackets, archwires and ligatures are described as the orthodontic
tools that can influence this physical phenomenon that developed much interest in last years.
(Rev Esp Ortod. 2003;33(1):065-072)