title: Evaluation of cytotoxic effects of six self-etching adhesives with direct and indirect contact tests.
abstract: This study evaluated the cytotoxicity of self-etching primers/adhesives by direct contact and dentin barrier tests. The three two-step self-etching systems Clearfil SE Bond (CSE), Clearfil Protect Bond (CPB), Prime&Bond NT/NRC (PB) and one-step self-etching systems Reactmer Bond (RB), Clearfil Tri-S Bond (CTS), and Adper Prompt L-Pop (AP) were examined. In direct contact tests, L929 cells were cultured in the presence of diluted solutions (50, 20, 10, and 1%) of primer/conditioner of adhesive systems. For dentin barrier tests, each system was applied onto 0.5 or 1.5 mm thick human dentin assembled in a simple pulp chamber device and incubated for 24 h at 37°C to make the diffusive components contact the L929 cells placed at the bottom of the chamber. The cytotoxic effects were assessed by MTT assay. Cell culture without application of any primers/adhesives served as the control for both tests. One-way ANOVA and Tukey HSD tests were used for statistical analyses. The direct contact tests demonstrated that CSE and CPB were less toxic than the other materials at all dilutions. In the dentin barrier tests, toxic effects of materials were reduced with an increase in thickness of intervening dentin. CSE and CPB showed less cytotoxicity than the other adhesives (p<0.05) when applied to 0.5 mm-thick dentin, and CSE was the least toxic in the 1.5 mm-dentin group (p<0.05). Dentin thickness positively affected biocompatibility of the tested bonding systems. Two-step self-etching systems with HEMA-based primers were more biocompatible than other self-etching adhesives.
authors: Department of Operative Dentistry, Faculty of Dentistry, University of Yeditepe.
authors: Mahmut
authors: M
authors: Kusdemir
authors: Solen
authors: S
authors: Gunal
authors: Fusun
authors: F
authors: Ozer
authors: Satoshi
authors: S
authors: Imazato
authors: Naomi
authors: N
authors: Izutani
authors: Shigeyuki
authors: S
authors: Ebisu
authors: Markus B
authors: MB
authors: Blatz
mesh_terms: D000269:Adhesives / Q000009:adverse effects*; D000818:Animals; D001672:Biocompatible Materials / Q000009:adverse effects; D002460:Cell Line; D001840:Dental Bonding; D045662:Dental Etching; D003804:Dentin / Q000187:drug effects; D017220:Dentin-Bonding Agents / Q000009:adverse effects*; D006801:Humans; D007739:L Cells; D008422:Materials Testing; D008689:Methacrylates / Q000009:adverse effects*; D051379:Mice; D019279:Resin Cements / Q000009:adverse effects*
chemical_list: D000269:Adhesives; D001672:Biocompatible Materials; C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C438313:Clearfil SE Bond; C515604:Clearfil Tri-S Bond; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C408584:Prompt L-Pop; D019279:Resin Cements