Effect of phytic acid as an endodontic chelator on resin adhesion to sodium hypochlorite-treated dentin
Nassar Mohannad, Hiraishi Noriko, Islam Md. Sofiqul, Romero Maria JRH., Otsuki Masayuki, Tagami Junji,
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( Nassar Mohannad ) - University of Sharjah College of Dental Medicine Preventive and Restorative Dentistry
( Hiraishi Noriko ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Oral Health Sciences
( Islam Md. Sofiqul ) - RAK Medical and Health Sciences University RAK College of Dental Sciences
( Romero Maria JRH. ) - Indiana University School of Dentistry Department of Cariology, Operative Dentistry and Dental Public Health
( Otsuki Masayuki ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Oral Health Sciences
( Tagami Junji ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Oral Health Sciences
Abstract
Objectives: Phytic acid (IP6), a naturally occurring agent, has been previously reported as a potential alternative to ethylenediaminetetraacetic acid (EDTA). However, its effect on adhesion to sodium hypochlorite (NaOCl)-treated dentin and its interactions with NaOCl have not been previously reported. Thus, in this study, the effects of IP6 on resin adhesion to NaOCl-treated dentin and the failure mode were investigated and the interactions between the used agents were analyzed.
Materials and Methods: Micro-tensile bond strength (μTBS) testing was performed until failure on dentin treated with either distilled water (control), 5% NaOCl, or 5% NaOCl followed with chelators: 17% EDTA for 1 minute or 1% IP6 for 30 seconds or 1 minute. The failed specimens were assessed under a scanning electron microscope. The reaction of NaOCl with EDTA or IP6 was analyzed in terms of temperature, pH, effervescence, and chlorine odor, and the effects of the resulting mixtures on the color of a stained paper were recorded.
Results: The μTBS values of the control and NaOCl with chelator groups were not significantly different, but were all significantly higher than that of the group treated with NaOCl only. In the failure analysis, a distinctive feature was the presence of resin tags in samples conditioned with IP6 after treatment with NaOCl. The reaction of 1% IP6 with 5% NaOCl was less aggressive than the reaction of the latter with 17% EDTA.
Conclusions: IP6 reversed the adverse effects of NaOCl on resin-dentin adhesion without the chlorine-depleting effect of EDTA.
키워드
Bond strength; EDTA; Phytic acid; Reaction; Resin tag; Sodium hypochlorite
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