In vitro characterization of visible light-cured glass ionomer liners.
The purpose of this study was to characterize the in vitro performance of three visible light-cured glass ionomer liners. The liners containing 2-HEMA showed significantly higher compressive strength, diametral tensile strength and Vickers hardness than the liner without 2-HEMA. Statistically significant differences were found in the optical properties of the materials tested. The liners containing 2-HEMA manifested higher shear strength at liner/composite than at dentin/liner interfaces. The acid-base reaction was significantly delayed after light exposure in all the liners tested. The liner without 2-HEMA presented the greatest maximum gap at the liner/dentin interface. Significant correlations were detected between the optical properties of the liners and the top-bottom differences in the extent of conversion, as well as between the maximum marginal gap at the dentin/liner interface and the bond strength with dentin and composite. These correlations suggest the following areas for further developments: incorporation of low molecular weight polyalkenoic acids or accelerating agents to increase the initial carboxylate yield, increase in total transmittance and reduction in diffuse reflectance to improve the in-depth conversion, and reinforcement of the dentin liner interface to prevent gap formation.
Eliades
G
G
Research Center for Biomaterials, Athens, Greece.
Palaghias
G
G
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003736:Dental Cavity Lining; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010777:Photochemistry; D011140:Polyurethanes / Q000737:chemistry; D012031:Refractometry; D012117:Resins, Synthetic / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; D011140:Polyurethanes; D012117:Resins, Synthetic; C067790:Vitrabond; C070604:XR Bond; C005044:hydroxyethyl methacrylate