Mechanical properties and microstructures of glass-ionomer cements

Xie, Dong; Brantley, William A.; Culbertson, B. M.; Wang, Guojun

doi:10.1016/s0109-5641(99)00093-7

Cited by 407 publications

(404 citation statements)

References 32 publications

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“…However, because of their low mechanical strengths, conventional formulations are unsuitable for use in sites of concentrated high stress, such as posterior teeth (Classes I and II). 20 By imbibing the cellulose fibers in the GIC liquid before agglutinating them with the powder, the fibers were successfully incorporated into the composite. Interaction between the cellulose and the restorative cement components was rendered possible by the intrinsic polarity of cellulose, which is hydrophilic in nature.…”

Section: Discussionmentioning

confidence: 99%

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

et al. 2015

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In this study, conventional restorative glass ionomer cement (GIC) was modified by embedding it with mechanically processed cellulose fibers. Two concentrations of fibers were weighed and agglutinated into the GIC during manipulation, yielding Experimental Groups 2 (G2; 3.62 wt% of fibers) and 3 (G3; 7.24 wt% of fibers), which were compared against a control group containing no fibers (G1). The compressive strengths and elastic modulus of the three groups, and their diametral tensile strengths and stiffness, were evaluated on a universal test machine. The compressive and diametral tensile strengths were significantly higher in G3 than in G1. Statistically significant differences in elastic modulus were also found between G2 and G1 and between G2 and G3, whereas the stiffness significantly differed between G1 and G2. The materials were then characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Heterogeneously shaped particles were found on the G2 and G3 surfaces, and the cement matrices were randomly interspersed with long intermingled fibers. The EDS spectra of the composites revealed the elemental compositions of the precursor materials. The physically processed cellulosic fibers (especially at the higher concentration) increased the compressive and diametral tensile strengths of the GIC, and demonstrated acceptable elastic modulus and stiffness.

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Section: Discussionmentioning

confidence: 99%

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

et al. 2015

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“…Another property which differentiates CGIC from RMGIC is the microhardness, since the CGIC presents higher values in that matter 24 . In the future, it would be interesting to conduct an investigation similar to this one, introducing the analysis of physical property, in order to check if there is any relationship between this and the susceptibility of pigmentation of restorative materials.…”

Section: Discussionmentioning

confidence: 99%

Quantification of color variation of restorative materials used on pediatric dentistry after pigmentation

Lopes

Araújo

Milagre

2015

RGO, Rev. Gaúch. Odontol.

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“…In order to improve the antibacterial properties of the GICs, the addition of CHX to this material has been tested and showed excellent results 3,10,17,23 . According to Palmer et al 5 ., GICs have the potential of slowly releasing active agents, such as fluoride 24 , and the CHX incorporated into GICS can be similarly released into the oral cavity.…”

Section: Discussionmentioning

confidence: 99%

“…Factors such as integrity of the interface between glass particles and polymeric matrix, size of the particles, amount and size of the pores in the material all play an important role in determining the mechanical properties 7,10 such as compressive strength 10 .…”

Section: Introductionmentioning

confidence: 99%

Effect of chlorhexidine gluconate on porosity and compressive strength of a glass ionomer cement

Marti

Azevedo

Mata

et al. 2014

Rev. odontol. UNESP

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ResumoIntrodução: Por apresentar ampla atividade antibacteriana, a clorexidina (CHX) tem sido amplamente utilizada em odontologia, podendo ser facilmente incorporada ao cimento de ionômero de vidro (CIV) e liberada consequentemente na cavidade bucal. Objetivo: O objetivo neste estudo foi avaliar a porosidade e resistência à compressão de um CIV, ao qual foi adicionado diferentes concentrações de CHX. Material e método: Os espécimes foram preparados com CIV (Ketac Molar Esaymix) e divididos em 4 grupos de acordo com a concentração de CHX: controle, 0,5% e 1% e 2% (n=10). Para análise dos poros os espécimes foram fraturados com auxílio de martelo e cinzel cirúrgicos, de modo que a fratura era realizada no centro do corpo de prova, dividindo-o ao meio e as imagens obtidas no microscópio eletrônico de varredura (MEV) analisadas no software Image J. O teste de resistência à compressão foi realizado na máquina de ensaios mecânicos (EMIC -Equipamentos e Sistemas de Ensaios Ltda, São José dos Pinhais, PR, Brazil). A análise estatística foi realizada por ANOVA, complementada pelo teste de Tukey. Nível de significância adotado de 5%. Resultado: Não se observou alteração estatisticamente significante entre os grupos estudados tanto para o número de poros quanto para a resistência à compressão. Conclusão: O uso de CIV associado ao gluconato de CLX a 1% e 2% é a melhor opção para ser utilizada na clínica odontológica. Descritores: Cimentos de ionômeros de vidro; clorexidina; porosidade. AbstractIntroduction: For presenting wide antibacterial activity, chlorhexidine (CHX) has been extensively used in dentistry and can be easily incorporated into the glass ionomer cement (GIC) and consequently released into the oral cavity. Aim: The aim of this study was porosity and compression strength of a GIC, that was added to different concentrations of CHX. Material and method: Specimens were prepared with GIC (Ketac Molar Esaymix) and divided into 4 groups according to the concentration of CHX: control, 0.5% and 1% and 2% (n = 10). For analysis of pores specimens were fractured with the aid of hammer and chisel surgical, so that the fracture was performed in the center of the specimens, dividing it in half and images were obtained from a scanning electron microscope (SEM) analyzed in Image J software. The compressive strength test was conducted in a mechanical testing machine (EMIC -Equipment and Testing Systems Ltd., Joseph of the Pines, PR, Brazil). Statistical analysis was performed by ANOVA, Tukey test. Significance level of 5%. Result: No statistically significant changes between the study groups was observed both for the number of pores as well as for the compressive strength. Conclusion: The use of GIC associated with CHX gluconate 1% and 2% is the best option to be used in dental practice.

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Mechanical properties and microstructures of glass-ionomer cements

Cited by 407 publications

References 32 publications

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties

Quantification of color variation of restorative materials used on pediatric dentistry after pigmentation

Effect of chlorhexidine gluconate on porosity and compressive strength of a glass ionomer cement

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