Fluid movement across the resin-dentin interface during and after bonding.
This study evaluated the extent of water penetration through resin-dentin interfaces before and after being sealed with adhesives. Four adhesive resin systems (2 total-etch adhesives and 2 self-etching primer adhesives) were used in this study. Dentin disks were placed in a split-chamber device, and in situ fluid movement across dentin was measured, with and without physiological pressure, during bonding procedures or 24 hrs after bonding. The fluid movement across dentin occurs via dentin tubules after acid-etching. Large outward or inward fluid shifts across dentin were observed during air-drying and light-curing for resin application. The amount of fluid movement across resin-bonded dentin when total-etch adhesives were used was significantly greater than that with self-etching adhesives. The milder acid-etching effects of self-etching primers may retain hybridized smear plugs within the tubules that reduce outward fluid flow, resulting in superior dentin sealing.
Hashimoto
M
M
Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. masanori-h@mue.biglobe.ne.jp
Ito
S
S
Tay
F R
FR
Svizero
N R
NR
Sano
H
H
Kaga
M
M
Pashley
D H
DH
D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000494:pharmacology; D003804:Dentin / Q000187:drug effects; D003806:Dentin Permeability / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D019234:Dentinal Fluid / Q000502:physiology*; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000494:pharmacology; D012044:Regression Analysis; D019279:Resin Cements / Q000494:pharmacology*; D016369:Smear Layer; D018709:Statistics, Nonparametric; D014867:Water; D015036:Zinc Phosphate Cement / Q000494:pharmacology
D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C408584:Prompt L-Pop; D019279:Resin Cements; C115612:single bond; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; D015036:Zinc Phosphate Cement; C074045:Protect Cement