Leakage patterns associated with glass-ionomer-based resin restorations.
This study compared microleakage patterns for glass-ionomer-cement-based resin systems with and without a separating agent placed between the glass ionomer and resin. Results indicated significant leakage (100%) at the dentin glass-ionomer interface for specimens without a separating agent. Those with a separating agent showed almost no leakage between the dentin and glass ionomer (10%) and some leakage at the resin/glass ionomer interface (40%). These results suggest that the forces of polymerization shrinkage are stronger than the chemical bond between glass-ionomer cement and dentin. This bond fails during resin polymerization, eliminating any supplementary retention gained through chemical adhesion to dentin and opening a pathway for microleakage.
Wieczkowski
G
G
State University of New York at Buffalo, School of Dental Medicine.
Joynt
R B
RB
Davis
E L
EL
Yu
X Y
XY
Cleary
K
K
D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008963:Molar; D013499:Surface Properties
D003188:Composite Resins; D005899:Glass Ionomer Cements; C074319:GC Lining Cement; C061499:Ketac-Bond