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Abstract
Many irrigants have been proposed for non-surgical root canal treatment. They are predominantly assigned to one of two main categories: germicides and calcium chelators. The ideal root canal irrigation would provide lubrication for instrumentation, and it would flush debris from the canal during mechanical preparation. It would dissolve organic tissue in inaccessible areas of the root canal. Sodium hypochlorite is considered the most widely used irrigant in today’s modern practices. Being a strong tissue solvent and an aggressive dissolver of organic matter, sodium hypochlorite was suggested to change the nature of dentin. The aim of the present study was to evaluate the effect of NaOCl with two different concentration (5.25% and 2.6%) on the chemical structure of root canal dentin, fracture resistance and bond strength to root canal dentin.