Showing papers by "Bart Van Meerbeek published in 2006"

Analysis of chemical interaction of 4-MET with hydroxyapatite using XPS.

Abstract: Each dental adhesive contains a specific functional monomer that determines its actual adhesive performance to tooth tissue. 4-methacryloxyethyl trimellitic acid (4-MET) is well-known as one of the functional monomers mostly available and consequently widely used in commercial adhesives. We therefore characterized the chemical interaction of 4-MET with hydroxyapatite (HAp) using X-ray Photoelectron Spectroscopy (XPS). XPS revealed that the peak representing -COO- of 4-MET shifted to a lower binding energy, when 4-MET was adsorbed onto HAp. Deconvolution of this shifted peak disclosed two components with a peak representing unreacted carboxyl groups and ester groups, and a peak suggesting chemical bonding of other carboxyl groups to Ca of HAp. XPS spectra of HAp treated with 4-MET also disclosed the surface to be enriched in calcium and decreased in phosphorus, indicating that phosphorus was extracted at a relatively higher rate than calcium. It can thus be concluded that true chemical bonding of 4-MET with calcium present in HAp occurred, as it was proven using XPS.

Effect of 4-MET- and 10-MDP-based primers on resin bonding to titanium

Abstract: The purpose of this study was to investigate the effect of a 4-MET- and 10-MDP-based primer on the bond strength of two resin cements (SuperBond CB Panavia Fluoro Cement, Kuraray) to titanium (Ti). Ti plates were treated with six experimental primers consisting of, respectively, 10-MDP and 4-MET in concentrations of 0.1, 1 and 10wt%, or were kept untreated (control). The highest tensile bond strength of Panavia Fluoro Cement to Ti was obtained when the Ti surface was pre-treated with 10wt% 10-MDP and was significantly higher than that when a lower concentrated 10-MDP-based primer or any 4-MET-based primer was used. On the contrary, no significant difference in tensile bond strength of SuperBond C&B was found for the untreated and six pre-treated Ti surfaces, although pre-treatment with each 10-MDP-based primer resulted in a higher tensile bond strength as compared to any 4-MET pre-treatment. Altogether, the data obtained strongly suggest that 10-MDP is effective to improve the adhesive performance of resin to titanium.

Bonding to enamel and dentin

Abstract: INTRODUCTION ADHESIVE DENTISTRY • Indications for Use of Adhesives • Advantages of Bonding Techniques • Mechanism of Adhesion • Factors Affecting Adhesion ENAMEL BONDING • Steps for Enamel Bonding • Mechanism of Etching DENTIN BONDING • Conditioning of Dentin • Priming of Dentin • Moist vs Dry Dentin DENTIN BONDING AGENT • Mechanism of Bonding • Evolution of Dentin Bonding Agents • Nanofilled Bonding Agents HYBRID LAYER AND HYBRIDIZATION • Hybridization (Given by Nakabayachi in 1982) • Zones of Hybrid Layer SMEAR LAYER • Structure • Formation of Smear Layer • Components of Smear Layer • Role of Smear Layer • Role of Smear Layer in Dentin Bonding • Classification of Modern Adhesives GLASS IONOMER BASED ADHESIVE SYSTEM • Steps FAILURE OF DENTIN BONDING