Background. The accessibility of the remineralizing ions in teeth's environment is essential for their incorporation into caries-affected dentin. Novel bioglass-reinforced materials capable of releasing fluoride, calcium and phosphates may be particularly useful in the tissue remineralization process. A novel restorative material, ACTIVA BioActive-Restorative (Pulpdent Corp., Watertown, USA), is a hydrophilic resin-modified glassionomer cement (RMGIC) enriched with bioglass particles and fortified with a patented rubberized polymer resin. Its application in restorative dentistry may be significant, promoting remineralization of carious lesions. Objectives. The aim of the study was to compare the fluoride ion release profiles from a bioglass-reinforced RMGIC, a conventional glass-ionomer cement (GIC) and a nanohybrid restorative polymer resin. Material and methods. The quantity of fluoride ions released from ACTIVA, Ketac Molar Quick Aplicap and Tetric EvoCeram was assessed using a fluoride-specific electrode. The surface characteristics of the preand post-experimental specimens were studied using a scanning electron microscope (SEM) and confocal microscope. An X-ray powder diffraction (XRD) analysis was additionally used to examine the chemical compositions of the dental materials. Results. The greatest quantity of fluoride ions was freed from the GIC specimens (20.698-54. 118 ppm), followed by the bioglass-reinforced RMGIC (from 1.236 to 15.552 ppm) and nanohybrid polymer resin (0.370-1. 148 ppm). The pre-experimental specimens of the bioglass-reinforced RMGIC were porous, while the post-experimental specimens were smoother with visible micro-cracks. The XRD analysis of the bioglass particles confirmed that the material was composed mainly of fluoride (27.70 mass%), silicon (15.62 mass%), aluminum (5.91 mass%), and calcium (5.40 mass%). Conclusions. The fluoride ion release profile of ACTIVA was lower than the GIC Keta Molar Quick Aplicap, but significantly higher than the nanohybrid restorative polymer resin Tetric EvoCeram.
Porenczuk A, Grzeczkowicz A, Maciejewska I, et al. An initial evaluation of cytotoxicity, genotoxicity and antibacterial effectiveness of a disinfection liquid containing silver nanoparticles alone and combined with a glass-ionomer cement and dentin bonding systems.
Introduction. Dental procedures bear risk of pathogens transmission leading to cross--infection. Means of protection aim at preventing direct contact with patient’s infected tissues. Less attention is paid to indirect threats, such as the restorative material’s infection during treatment. Restorative materials portioned and packed in disposable blisters may effectively eliminate the risk of material’s contamination. Aim. The aim of the study was to assess the knowledge and attitude of polish dental students on infection of dental restorative materials during treatment. Material and methods. A survey was conducted among students of the Faculty of Dentistry at the Medical University of Warsaw, who were given disposable packages of the restorative material for cavity reconstruction during practical classes. Results. All students gained theoretical knowledge on cross-infection control. Less than half declared need for more classes in this field. Almost all of them (96%) admitted that pathogens transmission may occur during restorative treatment where one spatula is used for both picking the material from the syringe and placing it in the cavity. Only 68% of them actually use separate instruments during restorative treatment. All of them think that packing of the material in separate blisters may increase safety during treatment through minimizing risk of the material contamination. Conclusions. Polish dental students need more classes concerning cross-infection control in restorative dentistry. Restorative materials packed in disposable blisters may increase patients safety during restorative treatment.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.