Long-term adhesion and mechanism of bonding of a paste-liquid resin-modified glass-ionomer

Abstract Objectives The contribution of chemical bonding of the polycarboxylic acid in classical powder/liquid conventional glass ionomers (GI) and resin-modified glass-ionomers (RMGI) has been attributed to the excellent long-term bond strengths and clinical retention. RMGIs have been recently intr...

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Bibliographic Details
Published in:Dental materials 2009-04, Vol.25 (4), p.459-466
Main Authors: Mitra, Sumita B, Lee, Chi-Ying, Bui, Hoa T, Tantbirojn, Daranee, Rusin, Richard P
Format: Article
Language:English
Subjects:
Adhesion
Advanced Basic Science
Animals
Cattle
Composite Resins
Dental Bonding
Dental Cavity Lining
Dental Stress Analysis
Dentistry
FTIR
Glass ionomer
Glass Ionomer Cements - chemistry
Materials Testing
Microscopy, Electron, Scanning
Polycarboxylic acid
SEM
Shear Strength
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis - methods
XPS
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Summary:Abstract Objectives The contribution of chemical bonding of the polycarboxylic acid in classical powder/liquid conventional glass ionomers (GI) and resin-modified glass-ionomers (RMGI) has been attributed to the excellent long-term bond strengths and clinical retention. RMGIs have been recently introduced as paste/liquid systems for convenience of clinical usage. The objective of this study was to investigate the long-term bond strengths and mechanism of adhesion of paste-liquid RMGI in order to ascertain whether similar characteristics are retained. Methods Long-term shear adhesion to dentin and enamel was measured on two paste-liquid RMGIs and one powder/liquid RMGI. Scanning electron microscopy (SEM), Fourier-transformed infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses were carried out on the paste-liquid RMGI Vitrebond Plus (VBP) and compared with the classical powder/liquid RMGI Vitrebond (VB). Results VBP maintains adhesion to dentin and enamel over long times; its long-term adhesive performance is equivalent to VB. FTIR data confirm that VBP exhibits the carboxylate crosslinking reaction of a true glass ionomer. SEM images show evidence of micromechanical bonding at the interface between VBP and the tooth. XPS and FTIR data show that the methacrylated copolyalkenoic acid component present in VB and VBP chemically bonds to the calcium in HAP. Significance The new paste-liquid RMGI liner, VBP, shows equivalent adhesion to its powder-liquid predecessor, VB. The adhesion mechanism was attributed to micromechanical and chemical bonding. This chemical bond is a significant factor in the excellent long-term adhesion of these materials.
ISSN:0109-5641
1879-0097
DOI:10.1016/j.dental.2008.09.008