THE EFFECT OF DIFFERENT IRRIGATING SOLUTIONS AND LASER IRRADIATION ON PUSH OUT BOND STRENGTH OF PROSTHETIC POSTS: AN IN VITRO STUDY

Fibre reinforced composite posts, in combination with resin cements have been widely used to restore teeth. Retention of fibre posts in roots depends upon adhesion between resin cement and the dentin as well as adhesion between resin cement and posts. After post space preparation dentin walls are covered with heavy smear layer. To create a hybrid layer it is necessary to remove the smear layer and debris from the dentin canal walls and the initial part of dentinal tubules to increase the retention when resin cement is used. Various chemical agents such as physiologic saline, Sodium hypochlorite (NaOCl) irrigation, Sodium hypochlorite (NaOCl) followed by 17% Ethylenediaminetetraacetic acid (EDTA), Chlorhexidine irrigation are used to remove smear layer efficiently. Recently lasers with wide range of chacteristics Niodymium-doped yttrium aluminium garnet (Nd:YAG), diode laser, Erbium-doped yttrium aluminium garnet (Er:YAG) have been evaluated for smear layer removal.