No Evidence for DNA Double-strand Breaks Caused by Endodontic Sealers

作者：Van Landuyt Kirsten L^*; Geebelen Benjamin; Shehata Mostafa; Furche Silja L; Durner Juergen; Van Meerbeek Bart; Hickel Reinhard; Reichl Franz X

来源：Journal of Endodontics, 2012, 38(5): 636-641.

DOI：10.1016/j.joen.2011.12.037

• DNA double-strand breaks
• endodontic sealers
• epoxy resin
• gamma H2AX assay
• methacrylate-based
• resin-based
• root canal sealer

Introduction: On extrusion, endodontic sealers might come into close contact with the periapical tissues for long periods. The objective of this study was to test possible mutagenicity of resin-based endodontic sealers by evaluating their potential to induce DNA double-strand breaks (DSBs). Methods: Human gingival fibroblasts were exposed to subtoxic concentrations of eluates from 1 epoxy resin based endodontic sealer (AH Plus Jet) and 2 methacrylate-based endodontic sealers (EndoRez and Real Seal). As control, Calcicur, a Ca(OH)(2)-based sealer, was used. The gamma-H2AX immunofluorescence assay was used to microscopically detect DNA DSBs, and a custom algorithm was developed to quantify them. Results: The cytotoxicity of the 24-hour eluates could be ranked in the following order: AH Plus Jet %26gt; Real Seal %26gt; EndoRez %26gt;%26gt; Calcicur. The gamma-H2AX assay revealed that 1.3%-4.3% of the cell nucleus was occupied by foci when the cells were exposed to the eluates of the endodontic sealers. This was not significantly different from the negative control group in which the cells had been exposed to medium (2.1%). Conclusions: No indications for increased risk of genotoxicity of resin-based root canal sealers caused by the induction of DNA DSBs were found in this study. (J Endod 2012;38:636-641)

• 出版日期2012-5