title: Dentin diffusion of HEMA released from etch-and-rinse and self-etch bonding systems.
abstract: The aim of this in vitro study was to determine the diffusion of 2-hydroxyethyl methacrylate (HEMA) released from different bonding systems (BS) through dentin. Occlusal cavities with a remaining dentin thickness (RDT) of 0.5 mm (n=90) and 0.25 mm (n=80), respectively, were prepared in dentin discs of non-carious human molars. Artificial pulp chambers were attached to the pulpal side of each dentin disc. Bonding systems were applied with (Clearfil SE Bond, OptiBond FL, OptiBond Solo Plus) or without (AdheSE, Adper Prompt L-Pop, Clearfil SE Bond, OptiBond FL, OptiBond Solo Plus Self Etch, Xeno III) prior phosphoric acid etching. HEMA was detected by gas chromatography/mass spectrometry (n=10 per BS and RDT). The highest mean HEMA concentration was found in the 0.25 mm RDT group treated with OptiBond FL (13.3 microg) and the lowest mean HEMA concentration was detected in the 0.5 mm RDT group treated with AdheSE (0.5 microg). At 0.25 mm RDT the quantities of HEMA recovered in the artificial pulp chambers were significantly higher than at 0.5 mm RDT, except for Clearfil SE Bond. Etching with phosphoric acid increased the detected HEMA quantities compared with self-etch BS. In deep cavity preparations, etching with phosphoric acid should be avoided in favor of the use of self-etch BS.
authors.affiliation: Department of Operative Dentistry and Periodontology, University of Ulm, Ulm, Germany. andreas.rathke@uniklinik-ulm.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Rathke
authors.forename: Andreas
authors.initials: A
authors.lastname: Alt
authors.forename: Nadin
authors.initials: N
authors.lastname: Gambin
authors.forename: Bernd
authors.initials: B
authors.lastname: Haller
mesh_terms: D001840:Dental Bonding / Q000379:methods; D045662:Dental Etching / Q000379:methods*; D003764:Dental Materials / Q000009:adverse effects; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000627:therapeutic use*; D004812:Epidemiologic Methods; D006801:Humans; D008689:Methacrylates / Q000032:analysis*; D010756:Phosphoric Acids / Q000009:adverse effects
chemical_list: D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D010756:Phosphoric Acids; C005044:hydroxyethyl methacrylate; C030242:phosphoric acid