Comparative Evaluation of the Remineralizing Effects and Surface Microhardness of Glass Ionomer Cements Containing Bioactive Glass (S53P4): An in vitro Study

Abstract

Dental cements including the glass ionomer cement (GIC) have found widespread use in restoring tooth structures. In this study, modifications of glass ionomer cements (GICs) were made by adding bioactive glass (BAG) to GIC to obtain bioactive restorative materials. This study used polarized light microscopy (PLM) to examine the remineralization effects of the study materials on dentin. It also evaluated the Vickers microhardness of the experimental materials. Experimental glass ionomer cement (GIC)-BAG materials were made by mixing 10 wt% of BAG particles with conventional cure and resin-modified GIC powders. Class V restorations were made in 80 extracted mandibular teeth which included 4 groups of 20 teeth each. 100 |jm sections of the teeth were examined under polarized light microscope after undergoing pH cycling. Materials were also processed into 80 cylindrical specimens and immersed in water for 7 and 30 days before mechanical tests. Resin-modified GIC containing BAG showed a thick uniform layer of mineralization on the restoration-dentin interface. The conventional cure GIC-based materials had higher surface microhardness than the resin-modified materials.Significance: The addition of BAG to GIC compromises the mechanical properties of the materials to some extent. Thus, their clinical use ought to be restricted to applications where their bioactivity can be beneficial, such as root surface fillings and liners in dentistry.

Effects of Different Percentages of Microhydroxyapatite on Microhardness of Resin-modified Glass-ionomer and Zirconomer

“…Hardness is one of the physical properties that compromises the fatigue strength of materials due to premature failure (9). The clinical longevity of materials is associated with their resistance to catastrophic failure that is measured using their fracture toughness (9).…”

“…Also in Lee’s survey, it was shown that the physical properties of RMGI improved with the incorporation of 10% nano-HA and micro-HA (10), and HA-added RMGI showed the highest bioactivity and bond strength to tooth structures (9,10). In another study, Khaghani explained that adding 5 wt% of HA increased the compressive strength of conventional glass-ionomer and also improved its diametral and tensile strengths (3).…”

Alkasites, a New Alternative to Amalgam. Report of a Clinical Case

“…According to the findings of the latest research, bioactive restorative materials have emerged in the operative dentistry as smart materials of great qualities [6,[22][23][24][25][26]. The advantages, which have already been described in this work plus the new features that an alkasite has, like the alkaline fillers that increase their concentration where there's an acid attack in the oral cavity, either in saliva, as well as the tooth structure [27].…”

Glass Ionomer Cements’ Effect on the Change in the Chemical Composition of Tooth Crown Dentin

“…Кроме того, фтор участвует в процессе деминера-лизации и реминерализации с образованием гид-роксифторапатита, устойчивого к кислотному воз-действию микроорганизмов. Высокой адгезией СИЦ к твердым тканям зуба объясняется непрони-цаемость соединения "СИЦ -дентин" для ротовой жидкости, микробов и их токсинов, что подтвер-ждено многочисленными лабораторными исследо-ваниями [1,2,3,8,9,12,13,16,20]. Важным аспек-том является возможность достижения большого количества вариаций композиций состава (алюмофторсиликатного стекла).…”