Durability of resin-dentin bonds to water- vs. ethanol-saturated dentin.
Higher 24-hour resin-dentin bond strengths are created when ethanol is used to replace water during wet bonding. This in vitro study examined if ethanol-wet-bonding can increase the durability of resin-dentin bonds over longer times. Five increasingly hydrophilic experimental resin blends were bonded to acid-etched dentin saturated with water or ethanol. Following composite build-ups, the teeth were reduced into beams for 24-hour microtensile bond strength evaluation, and for water-aging at 37 degrees C for 3, 6, or 12 months before additional bond strength measurements. Although most bonds made to water-saturated dentin did not change over time, those made to ethanol-saturated dentin exhibited higher bond strengths, and none of them fell over time. Decreased collagen fibrillar diameter and increased interfibrillar spacing were seen in hybrid layers created with ethanol-wet-bonding. Increases in bond strength and durability in ethanol-wet-bonding may be due to higher resin uptake and better resin sealing of the collagen matrix, thereby minimizing endogenous collagenolytic activities.
Hosaka
K
K
Cariology and Operative Dentistry, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
Nishitani
Y
Y
Tagami
J
J
Yoshiyama
M
M
Brackett
W W
WW
Agee
K A
KA
Tay
F R
FR
Pashley
D H
DH
D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D000431:Ethanol / Q000737:chemistry*; D024022:Fibrillar Collagens / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D019279:Resin Cements / Q000737:chemistry*; D012822:Silicon Dioxide; D012995:Solubility; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability; D015040:Zirconium
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D024022:Fibrillar Collagens; D019279:Resin Cements; C083568:Z100 composite resin; D014867:Water; D000431:Ethanol; D012822:Silicon Dioxide; D015040:Zirconium