ABSTRACT
Aim: The aim of the present study was to evaluate the effects of different concentrations of sodium hypochlorite applied for 30 seconds on acid etched dentin on the shear bond strengths of an acetone-based adhesive. Materials and Methods: 40 freshly extracted molars were used as specimens to evaluate shear bond strength of composite to sodium hypochlorite (NaOCl)-treated dentin using Prime and Bond NT dentin bonding agent after 10% NaOCl (Group I), 5% NaOCl (Group II), 2.5% NaOCl (Group III) and No NaOCl (Control) treatment. Shear bond strengths of all specimens were measured using an Intron Universal Testing Machine. Results: Group II demonstrated higher bond strengths than Groups I, III and IV. Groups I, III and IV did not show any statistically significant differences in their bond strengths. Group III demonstrated the least bond strength. Group I showed similar bond strength as that of Group IV. Conclusion: Highest shear bond strength values were demonstrated by Group II i.e. 5% sodium hypochlorite treatment group. This could be because of partial decollagenation and formation of an optimum hybrid layer.
ABSTRACT
Dentinogenesis Imperfecta is an autosomal dominant disorder of tooth development characterized by the presence of opalescent dentin, resulting in a dusky blue to brownish discoloration of the teeth. This condition is genetically and clinically heterogeneous, it may affect only the teeth or it may be associated with the Osteogenesis Imperfecta. It is inherited as autosomal dominant trait and in fact it is one of the most common dominantly inherited disorder in humans. The scalloping at the dentinoenamel junction is thought to help by mechanically interlocking the two hard tissues together. This locking is defective in these conditions which lead to enamel fracture easily from the defective dentin. The exposed dentin may then undergo severe and rapid attrition. Early diagnosis and proper treatment is mandatory in these conditions. Delay in the treatment can cause partial or complete loss of clinical crowns with healthy roots. A case report is discussed in which a young patient with Dentinogenesis Imperfecta was treated with maxillary fixed partial dentures and mandibular fibre reinforced overdentures with metal occlusal surfaces.