Stability of wet versus dry bonding with different solvent-based adhesives.
OBJECTIVE
To evaluate the effects of surface moisture (wet or dry) and storage (24h or 3 months) on the microtensile bond strength (BS) of resin/dentin bonds mediated by two water/ethanol based adhesives Single Bond, 3M-ESPE, (SB) and Opti Bond Solo Plus, Kerr, (OB), and two acetone-based adhesives, One Step, Bisco, (OS) and Prime&Bond NT, Caulk/Dentsply, (PB).


METHODS
Flat dentin surfaces were polished with 600-grit SiC paper, etched with 35% phosphoric acid for 15s and rinsed for 20s. Half the surface was maintained moist and the other half was air-dried for 30s. Each adhesive was applied simultaneously to both halves, left undisturbed for 30s and light-cured. Four-mm resin build-ups were constructed incrementally. After storage in water at 37 degrees C for 24h, slabs were produced by transversal sectioning and trimmed to an hourglass shape (0.8mm2). Half of the specimens were tested in tension at 0.6mm/min immediately after trimming and the other half after 3 months of water storage. Data were analyzed by two-way ANOVA and SNK for each material.


RESULTS
Both moisture and storage affected BS to dentin, and was material-dependent. Dry bonding affected mostly the acetone-based adhesives. Larger reductions in bond strength were associated with dry bonding after 3 months of water storage.


CONCLUSIONS
Wet bonding resulted in more stable bonds over 3 months of water storage for most of the materials tested.
Manso
Adriana P
AP
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
Marquezini
Luiz
L
Silva
Safira M A
SM
Pashley
David H
DH
Tay
Franklyn R
FR
Carvalho
Ricardo M
RM
D000096:Acetone; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004356:Drug Storage; D000431:Ethanol; D006801:Humans; D008422:Materials Testing; D008963:Molar; D019279:Resin Cements / Q000737:chemistry*; D013718:Tensile Strength; D014867:Water; D017155:Wettability
D017220:Dentin-Bonding Agents; D019279:Resin Cements; D014867:Water; D000096:Acetone; D000431:Ethanol