Abstract
Еndodontic irrigants could alter the mechanical properties of root canal dentin. The aim of the current study was tо compare the effect of three irrigation protocols on root canal dentin microhardness and roughness with respect to their concentration and additional ultrasonic activation for the same treatment period. Forty single-rooted, intact upper incisors were decoronated and sectioned longitudinally in buccolingual direction. The surfaces of all eighty samples were polished and randomly allocated into four equal groups (n=20): Group 1: Control group (distilled water); Group 2: 2% NaOCl/2 min followed by 17% EDTA/2 min; Group 3: 2% NaOCl/2 min followed by 17% EDTA/2 min, both ultrasonically activated Group 4: 5.25% NaOCl/2 min followed by 17% EDTA/2 min. Root dentin microhardness was significantly lowered by all of the irrigants regardless of their concentration and/or additional agitation (p<0.05). The surface of root canal dentin was roughned to the greatest extent by the ultrasonically activated irrigation solutions (p<0.001). The ultrasonic activation of the disinfection solutions significantly altered the biomechanical properties of dentin.
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