Effect of endodontic irrigation on bonding of resin cement to radicular dentin.
The influence of endodontic irrigation on shear bond strengths of resin cement to radicular dentin was investigated. Human radicular dentin blocks were divided into four groups and subjected to one of four endodontic irrigations: ethylenediaminetetraacetic acid (EDTA) group, 17% EDTA for 60 s; EDTA/sodium hypochlorite (NaOCl) group, 17% EDTA for 60 s followed by 10 ml of 5% NaOCl for 15 s; NaOCl group, 10 ml of 5% NaOCl for 15 s; and control group, no treatment. Morphological changes of dentin surface after endodontic irrigation were observed by scanning electron microscopy (SEM). A resin block was bonded to the radicular dentin after irrigation using resin cement with either wet-bonding (Uni-Etch/One-Step; Bisco) or self-etching (Tyrian SPE/One-Step Plus; Bisco) adhesives. Shear bond strengths were measured and the penetration of resin tags into dentinal tubules at resin-dentin interface was observed by SEM. With the wet-bonding system, the shear bond strengths for the EDTA/NaOCl group, in which dentinal tubules openings and uniform resin tag penetration into dentinal tubules were observed, were significantly higher than the EDTA and control groups. With the self-etching system, the shear bond strengths were significantly lower in the EDTA group compared with the NaOCl and control groups. The effects of endodontic irrigation on the bonding of resin cement to radicular dentin depended on the dentin bonding system used.
Hayashi
Mikako
M
Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. mikarin@dent.osaka-u.ac.jp
Takahashi
Yutaka
Y
Hirai
Maki
M
Iwami
Yukiteru
Y
Imazato
Satoshi
S
Ebisu
Shigeyuki
S
D000134:Acid Etching, Dental; D002614:Chelating Agents / Q000737:chemistry / Q000494:pharmacology; D001840:Dental Bonding; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012388:Root Canal Irrigants / Q000737:chemistry* / Q000494:pharmacology; D033081:Shear Strength; D012973:Sodium Hypochlorite / Q000737:chemistry / Q000494:pharmacology; D013499:Surface Properties; D014092:Tooth Root / Q000187:drug effects / Q000648:ultrastructure*
C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D002614:Chelating Agents; D017220:Dentin-Bonding Agents; C431350:Duo-Link; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; D012388:Root Canal Irrigants; C481138:Tyrian SPE; D004492:Edetic Acid; D012973:Sodium Hypochlorite; C030242:phosphoric acid