Publications by authors named "Hilde Molvig Kopperud"
Presence and leaching of bisphenol a (BPA) from dental materials.
Acta Biomater Odontol Scand
May 2018
Article Synopsis
- BPA can leach from certain dental materials used in fillings, sealants, and orthodontic treatments, raising concerns about safety.
- Researchers tested four composite fillings, three sealants, and two orthodontic bonding materials for BPA release under various conditions, including uncured and cured states.
- The study found that Tetric EvoFlow and DELTON had significantly higher BPA leaching, but overall levels were relatively low, suggesting they pose a minor risk to total BPA exposure.
Interactions of liposomes with dental restorative materials.
Colloids Surf B Biointerfaces
December 2015
The in vitro adsorption and retention of liposomes onto four common types of dental restorative materials (conventional and silorane-based resin composites as well as conventional and resin-modified glass ionomer cements (GIC)) have been investigated due to their potential use in the oral cavity. Uncoated liposomes (positively and negatively charged) and pectin (low- and high-methoxylated) coated liposomes were prepared and characterized in terms of particle size and zeta potential. The adsorption of liposomes was performed by immersion, quantified by fluorescence detection, and visualized by fluorescence imaging and atomic force microscopy.
View Article and Find Full Text PDFObjective: The aim of this work was to assess the influence of the bis-EMA content on the degree of conversion (DC) and its effect on the water sorption and solubility.
Materials And Methods: In a polytetrafluorethylene (PTFE) mould, 30 samples (Ø = 5 mm, height = 2 mm) of four experimental dental composite resins were cured for 10 s, 20 s and 40 s. The DC was analysed by Fourier Transform (FT)-Raman spectroscopy.
The aim of this study was to analyse leachable monomers, additives, and degradation products from polymer-based orthodontic base-plate materials. One heat-cured resin (Orthocryl), one light-cured (Triad VLC), and three thermoplastic materials (Biocryl C, Essix A+, and Essix Embrace) were investigated. Elution was performed in water at 37°C for 10 days.
View Article and Find Full Text PDFObjectives: In vitro exposure to chemical compounds in dental materials may cause cell death by apoptosis, necrosis or a combination of both. The aim of this paper was to evaluate aqueous extracts of freshly cured compomers Freedom (SDI) and F2000 (3M ESPE), and constituents identified in the extracts, GDMA (glycerol dimethacrylate), TEGDMA (triethylene glycol dimethacrylate) and HEMA (2-hydroxyethyl methacrylate) for their ability to induce necrosis and apoptosis in primary rat alveolar macrophages and the J744A1 macrophage cell line.
Methods: The cells were exposed to either extracts of freshly cured samples of the products or to one of the constituents identified in the extracts.