Hydrostatic intrapulpal pressure and bond strength of bonding systems.
The purpose of this study was to evaluate the effect of intra-pulpal pressure on shear bond strength of three light-cured glass-ionomer cements (GC lining cement, Vitrabond, and Zionomer) and four dentin bonding agents [Gluma/Scotchbond, Scotchbond 2, MBL, and Clearfil Photo Bond]. Buccal dentin surfaces were prepared just below the DEJ by means of a diamond bur. Dentin treatments were made for Zionomer (Zionomer conditioner), Scotchbond 2 (Scotchprep), MBL (10-3 solution), Clearfil PB (H3PO4), GC lining cement (Polyacrylic acid), and Gluma/Scotchbond (EDTA). Resin composites were inserted into tubes, positioned on dentin, cured, tested after five min or 24 h, and compared with samples bonded and stored under an intra-pulpal pressure of 36 cm of saline. After 24 h in superficial dentin, intrapulpal pressure reduced the bond strength only in MBL, Scotchbond 2, and Zionomer. Clearfil PB bond strength was increased, while Vitrabond, GC lining cement, and Gluma/Scotchbond were unaffected by the presence of pulpal pressure. However, in deep dentin, Scotchbond 2 and Clearfil PB shear bond strengths were significantly reduced by storage in the presence of 36-cm H2O pulpal pressure. Only Vitrabond remained unaffected by pulpal pressure in deep dentin.
Prati
C
C
School of Dentistry, University of Bologna.
Pashley
D H
DH
Montanari
G
G
D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003782:Dental Pulp / Q000502:physiology*; D003804:Dentin; D005899:Glass Ionomer Cements; D005976:Glutaral; D006874:Hydrostatic Pressure; D011109:Polymethacrylic Acids; D019279:Resin Cements
C029849:Clearfil Bonding Agent; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; D011109:Polymethacrylic Acids; D019279:Resin Cements; C041330:Scotchbond; C044372:Gluma; D005976:Glutaral