Journal of Orthodontics & Endodontics

Root Fracture in Teeth with Cast Metal Retainers: Clinical Case Report

Intraradicular retainers are cylindrical or conical structures traditionally made of metal or fiberglass used in the root canal of endodontically treated teeth. They have been widely used in cases where the remaining coronal structure of the tooth is not sufficient to provide adequate support for the restorative material. Metal retainers have a much greater modulus of Elasticity (E) than the glass fibre. This was the factor pointed out as responsible for allowing greater resistance to fracture in the system due to the greater ability to withstand the load concentration before the deformation indicated in cases where high occlusal loads are present, such as patients with bruxism and absence of adequate occlusion.

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