L'Orthodontie Française


Corrosion et concrétions Comment améliorer le glissement fil/brackets ? Volume 73, issue 1, Mars 2002


Sliding mechanics are widely used in fixed orthodontic devices. Parasitic phenomena that block or slow the movement have, until now, been relatively neglected. The friction that appears at the interface of the wire/bracket/ligature opposes the free sliding action, necessary to allow the motor forces to displace the dental units that are guided on an appropriately shaped metal arch.

There are three main causes that make unpredictable the control of orthodontic forces. The first one is the involuntary irregularities introduced onto the arches during their construction. The two others consist in factors blocking the sliding action. They can be unknown or misunderstood: the superficial corrosion of wires and brackets which affect the polished surface, and the appearance of adherent concretions due to hard and adherent tartar. This paper will discuss their involvement and describe the ways to improve the sliding effects.