Effect of ultrasonic excitation on the porosity of glass ionomer cement: A scanning electron microscope evaluation

Coldebella, Cármen Regina; Pinto, Luiz Gustavo Rodrigues; Zuanon, Ângela Cristina Cilense

doi:10.1002/jemt.20873

Cited by 22 publications

(39 citation statements)

References 19 publications

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“…1. That corroborates to the findings in previous studies [11][12][13]. The presence of pores in glass-ionomers microstructure can be attributed to the following factors: air incorporation during powder and liquid hand-mixture that decreases the polymer conversion degree due to inhibition of the setting reaction by the oxygen in the bubbles; placement technique of the material into the tooth cavity where the air bubbles are incorporated or entrapped into the material; and changes in powder/ liquid proportion before mixture [13,14].…”

Section: Discussionsupporting

confidence: 91%

“…The mechanical properties of the dental materials are influenced by their microstructure. Porosity shows to have a harmful influence on the compressive strength of the material and thus in their clinical performance [11,13,15,31]. Also, the content and molecular weight of polyacids and resins influence the mechanical properties of the glass-ionomer materials.…”

Section: Discussionmentioning

confidence: 99%

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Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

et al. 2015

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The main aim of this study was to evaluate the influence of porosity, microstructure, and chemical composition on the wear and compressive strength of dental glass-ionomer or resin composite. Cylindrical samples (6 9 4 mm) were prepared from a nano-hybrid resin composite (Grandio Ò SO/RC, VOCO), a resin-modified glass ionomer (Vitremer TM /VI, 3 M-ESPE) and a conventional glass ionomer (Ionofil Ò Molar/CO, VOCO). Porosity and topography of the materials were evaluated by optical and scanning electron microscopy (SEM). Roughness was evaluated by R a and R t parameters at 0.1 mm/s under cutoff of 0.8 mm. Then, compressive tests were performed at 1 mm/min. Wear tests were carried out at 20 N, 2.5 mm of displacement, at 1 Hz for 90 min in artificial saliva solution. The results were statistically analyzed with a one-way ANOVA and Tukey's test (p \ 0.05). Resin composite revealed a significantly lower porosity (1.21 ± 0.20 %) than glass-ionomer restoratives (5.69-7.54 %) as well as lower values of R a and R t roughness (p \ 0.05). Also, resin composite showed significantly higher values of mechanical strength (334 ± 15.9 MPa) compared to conventional (78.78 ± 13.30 MPa) or modified glass ionomer (169.50 ± 20.98 MPa) (p \ 0.05). For maximal depth of wear, resin composite also showed significantly lower values than glass ionomer (p \ 0.05). Homogeneous wear morphology was noticed by SEM analyses on glass ionomers in opposition to resin composite. Glass ionomers showed a poor mechanical behavior associated to a high porosity and wear rate when compared to resin composite.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

et al. 2015

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“…In order to minimise the effects of porosity, one can use the ultrasonic excitement during the initial setting of the material, thus decreasing number, size and amount of pores. However, the internal porosity of the material is not completely eliminated 15 .…”

Section: Discussionmentioning

confidence: 99%

“…In order to standardise the area to be analysed, the image was divided into quadrants and the upper left quadrant of each one was selected by using the software tools. Next, pores were delimitated and calculated 15,16 .…”

Section: Methodsmentioning

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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“…Coldebella ve ark. 'ları 40 ultrasonik uyarım ile cam iyonomer simanda iç pörözitenin azaldığını taramalı elektron mikroskobu (SEM) kullanarak göstermişlerdir.…”

Section: -Ortodontide Ultrasonik Aletlerunclassified

Di̇ş Heki̇mli̇ği̇nde Ultrasoni̇k Kullanimi: Derleme

Adıgüzel¹,

Ahmetoğlu²,

Altan³

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Dentistry has always benefited from the development of new techniques and equipment, which have aimed to improve outcome and predictability of treatments. Innovations such as ultrasonics has found application of new devices in dentistry in recent years. This review aims at presenting the numerous uses of ultrasonic in clinical dentistry and emphasizes the broad applications in a modern-day dentistry practice.

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Effect of ultrasonic excitation on the porosity of glass ionomer cement: A scanning electron microscope evaluation

Abstract: Under the tested conditions, US was an effective method for porosity reduction inside the material.

Cited by 22 publications

References 19 publications

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

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

Di̇ş Heki̇mli̇ği̇nde Ultrasoni̇k Kullanimi: Derleme

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