Modification of glass ionomer cements on their physical-mechanical and antimicrobial properties (original) (raw)
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The effect of antimicrobial additives on the properties of dental glass-ionomer cements: a review
Acta Biomaterialia Odontologica Scandinavica
Aim: The aim of this article is to review the literature on the use of antimicrobial additives in glass-ionomer dental cements. Method: An electronic search between 1987 and the end of 2017 was performed using PubMed, Web of Science and Google search engines with the terms glass-ionomer, glass polyalkenoate, antibacterial and antimicrobial as the key words. The search was refined by excluding the majority of references concerned with cement antimicrobial properties only. Extra papers already known to the authors were added to those considered. Results: A total of 92 relevant articles have been cited in the review of which 55 are specifically concerned with the enhancement of antibacterial properties of glass-ionomers, both conventional and resin-modified, with additives. In addition, information is included on the uses of glass-ionomers and the biological properties of the antibacterial additives employed. There are several reports that show that additives are typically released by diffusion, and that a high proportion is usually left behind, trapped in the cement. Additives generally increase setting times of cements, and reduce mechanical properties. However, smaller amounts of additive have only slight effects and the longer-term durability of cements appears unaffected. Conclusion: Modified glass-ionomer cements seem to be acceptable for clinical use, especially in the Atraumatic Restorative Treatment (ART) technique.
Enhancing the Mechanical Properties of Glass-Ionomer Dental Cements: A Review
Materials
This paper reviews the strategies that have been reported in the literature to attempt to reinforce glass-ionomer dental cements, both conventional and resin-modified. These cements are widely used in current clinical practice, but their use is limited to regions where loading is not high. Reinforcement might extend these applications, particularly to the posterior dentition. A variety of strategies have been identified, including the use of fibres, nanoparticles, and larger particle additives. One problem revealed by the literature survey is the limited extent to which researchers have used International Standard test methods. This makes comparison of results very difficult. However, it does seem possible to draw conclusions from this substantial body of work and these are (1) that powders with conventional particle sizes do not reinforce glass-ionomer cements, (2) certain fibres and certain nanoparticles give distinct improvements in strength, and (3) in the case of the nanopartic...
Acta stomatologica Naissi, 2021
Background: The effect of the antimicrobial agents benzalkonium chloride (BC) and cetylpyridinium chloride (CPC) on the restorative glass ionomer tooth cement (GIC) Fuji IX was investigated. Aim of the study: The aim of the study was to determine whether the addition of antimicrobial compounds impairs the physical and mechanical properties of the commercial GIC Fuji IX. Materials and Methods: The concentrations of 1%, 2% and 3% of antimicrobial agentsBC and CPC, by weight of the cement, were added during the mixing phase and different effects were studied. In most samples, there was a slight change in setting time. Samples with 4 mm diameter and 6 mm height were used to measure compressive strength and release. The release of antimicrobial compounds was analysed by UV-visible spectrophotometry at a wavelength of 259 nm for CPC and 214 nm for BC, in deionized water. Results: The obtained results showed that the release takes place through the diffusion mechanism in the first 2-3 hour...
A Review of Glass-Ionomer Cements for Clinical Dentistry
Journal of functional biomaterials, 2016
This article is an updated review of the published literature on glass-ionomer cements and covers their structure, properties and clinical uses within dentistry, with an emphasis on findings from the last five years or so. Glass-ionomers are shown to set by an acid-base reaction within 2-3 min and to form hard, reasonably strong materials with acceptable appearance. They release fluoride and are bioactive, so that they gradually develop a strong, durable interfacial ion-exchange layer at the interface with the tooth, which is responsible for their adhesion. Modified forms of glass-ionomers, namely resin-modified glass-ionomers and glass carbomer, are also described and their properties and applications covered. Physical properties of the resin-modified glass-ionomers are shown to be good, and comparable with those of conventional glass-ionomers, but biocompatibility is somewhat compromised by the presence of the resin component, 2 hydroxyethyl methacrylate. Properties of glass carbo...
Advances in glass ionomer cement: A review
International Journal of Dental Sciences, 2021
Glass ionomer cements are the commonly used restorative material in young children. They adhere to slightly moist enamel and dentin without the need of any adhesive system, release fluoride and have anticariogenic properties. But their disadvantages include poor tensile and flexural strength which may result in a higher rate of early fractures and also occlusal wear compared to other filling materials. To overcome these poor mechanical properties of glass ionomers, several modifications have been introduced to the conventional glass ionomer cements. Hence the aim of this paper is to review the modifications undergone by glass ionomer cement to improve their physicochemical properties.
Comparative Evaluation Of Mechanical Properties Of A Bioactive Resin Modified Glass Ionomer Cement
Ege Üniversitesi Dişhekimliği Fakültesi dergisi, 2017
Dental restoratif materyalin fonksiyonel kuvvetlere direnme kabiliyeti, uzun süreli klinik performansı için önemli bir gerekliliktir. Basınç ve bükülme mukavemeti ile yüzey mikro sertliği, dental restoratif malzemelerin önemli fiziksel özellikleridir. Bu çalışmanın amacı dört farklı rezin modifiye cam iyonomer siman (RMGIC)'ın mekanik özelliklerini karşılaştırmaktır.
On the possibility of incorporating antimicrobial components into glass-ionomer cements
Prilozi / Makedonska akademija na naukite i umetnostite, Oddelenie za biološki i medicinski nauki = Contributions / Macedonian Academy of Sciences and Arts, Section of Biological and Medical Sciences, 2009
Apart from their release of fluorine ions, GICs can potentially be used as templates for the release of other active antimicrobial ingredients. The aim of this study was to investigate the possibility of incorporating an antimicrobial compound into a glass-ionomer cement. For the realization of the aim set we used the commercially available ChemFlex glass-ionomer cement, a material widely used in restorative dentistry. Three groups of the commercial ChemFlex glass-ionomer were prepared, with no antimicrobial compound added, of 5 samples each - to serve as a control group; and another three groups of the same cement of 5 specimens each were also prepared, but each with a different concentration of benzalkonium chloride added to it - 1%, 2% and 3%, respectively - a total of 15 samples. The concentrations of released ions - fluoride and chloride - were measured at predetermined time instants. In order to determine the amount of ions (Cl(-) and F(-)) released into the medium (deionized ...
An overview of advances in glass ionomer cements
International Journal of Dental Materials, 2022
Glass-ionomer dental cements (GICs) are aesthetic direct restorative materials with anticariogenic activity. Glass-ionomers are composed of alumino-silicate glass powder and poly acrylic acid liquid. The significant characteristics of GICs among restorative materials are their ability to bond to moist tooth structure without any pre-treatment and to provide a prolonged period of fluoride release, which prevents subsequent tooth decay (caries). These characteristics, along with the materials' acceptable aesthetics and biocompatibility, make them popular and desirable for use in medical and dental applications. However, GICs exhibit poor mechanical qualities and moisture sensitivity. To improve their mechanical and physical qualities, the GIC powders have undergone extensive formulation and modification. This paper provides an overview of various fillers used to enhance the mechanical and physical properties of GICs.
The Journal of Contemporary Dental Practice, 2015
Glass ionomer cements (GICs) are restorative materials, which clinical use has increased significantly during the last decade. The aim of the present study was to analyze the chemical constitution and surface morphology of four glass ionomer cements: Maxxion R, VitroFill, Vidrion R and Vitremer. Twelve polyethylene tubes with an internal diameter of 3 and 3 mm in length were prepared, filled and then transferred to a chamber with 95% relative humidity and a temperature of 37ºC. The surface morphology of the tested materials was examined by scanning electron microscopy (SEM) and main components were investigated by energy-dispersive X-ray microanalysis (EDX). Scanning electron microscopy revealed irregular and rough external surface. Cracking was not observed. The main constituents were found to be aluminum, silicon, calcium, sodium and fluoride. Phosphorus, sulfur and barium were only observed in Vidrion R, while chlorine were only observed in Maxxion R. Elemental mapping of the outer surface revealed high concentration of aluminum and silicon. Significant irregularities on the surface of the tested materials were observed. The chemical constitution of all GIC was similar.
Journal of Applied Oral Science, 2019
Mechanical and optical properties of conventional restorative glassionomer cements-a systematic review Objectives: To perform a systematic review of test methodologies on conventional restorative glass-ionomer cement (GIC) materials for mechanical and optical properties to compare the results between different GICs. Material and Methods: Screening of titles and abstracts, data extraction, and quality assessments of full-texts were conducted in search for in vitro studies on conventional GICs that follow the relevant specifications of ISO standards regarding the following mechanical and optical properties: compressive strength, flexural strength, color, opacity and radiopacity. Sources: The Latin American and Caribbean Health Sciences (LILACS), Brazilian Bibliography of Dentistry (BBO) databases from Latin-American and Caribbean System on Health Sciences Information (BIREME) and PubMed/Medline (US National Library of Medicine-National Institutes of Health) databases were searched regardless of language. Altogether, 1146 in vitro studies were selected. Two reviewers independently selected and assessed the articles according to pre-established inclusion/exclusion criteria. Among all the properties investigated, only one study was classified as being of fair quality that tested compressive strength and was included. It was observed that many authors had not strictly followed ISO recommendations and that, for some properties (diametral tensile strength and microhardness), there are no guidelines provided. Conclusions: It was not possible to compare the results for the mechanical and optical properties of conventional restorative GICs due to the lack of standardization of studies.