Effect of water on bonding of one-bottle self-etching adhesives.
This study evaluated the effect of water on dentin substrate bonding of one-bottle self-etching adhesives. Dentin substrates were divided into two groups: wet and dry dentin. Wet dentin is the normal substrate for bond testing whereas dry dentin was dehydrated in a desiccator for 24 hours. Bonded dehydrated teeth were then divided into two subgroups: stored in water or in desiccator for 24 hours. Microtensile bond strength of resin to dentin was measured using three one-bottle self-etching adhesives. In addition, nanoleakage evaluation was performed through the analyses of SEM and TEM micrographs. The bond strength of dry-dentin group was significantly greater than that of wet-dentin. Further, the amount of nanoleakage within the adhesive interface of dry-dentin group was less than that of wet-dentin. Results showed that bond strength and nanoleakage formation depended on the bonding substrate (wet versus dry dentin) before bonding. One-bottle self-etching adhesives might suck the water from dentinal tubules during bonding by osmosis, leading to nanoleakage formation and thus a decline in bond strength.
Division of Biomaterials and Bioengineering, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan. masanori-h@mue.biglobe.ne.jp
Masanori
M
Hashimoto
Shinichi
S
Fujita
Masayuki
M
Kaga
Yasutaka
Y
Yawaka
D000134:Acid Etching, Dental; D001840:Dental Bonding; D003763:Dental Leakage / Q000209:etiology*; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry; D003890:Desiccation; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D019279:Resin Cements / Q000737:chemistry; D012995:Solubility; D013718:Tensile Strength; D014867:Water / Q000009:adverse effects; D017155:Wettability
C505694:Clearfil S3 Bond; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements; C477386:iBond; D014867:Water