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Influence of the light source and curing parameters on microhardness of a silorane-based dental composite material

Malara P., Czech Z., Świderski W.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1331--1336

EN

The aim of the study was to determine the influence of the light source and the light-curing parameters (the distance of the material from the light source and time of light-curing) on microhardness of Flitek Silorane dental composite material. Standardized samples of Filtek Silorane material were cured using two types of Light Curing Units (LCUs) - halogen and LED. The distance of the light source and time of curing differed between samples. The Knoops microhardness was tested using microhardness tester Micromet 5103. Using LED light curing unit allowed to achieve significantly higher microhardness of silorane-based dental material Filtek Silorane than using halogen light curing unit. Decreasing the distance from the light source to the surface of silorane-based material Filtek Silorane improved its microhardness. A prolonged curing time could compensate the drop in microhardness of Filtek Silorane material resulting from an increased distance from the light source to the surface of the material only in a limited range of intervals.

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Degree of conversion of dental composite materials in relation to different light-curing parameters

Malara P., Czech Z., Świderski W.

Journal of Achievements in Materials and Manufacturing Engineering

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2015

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Vol. 70, nr 2

60--69

EN

Purpose: The aim of the work was determine conversion degree of composite dental materials with different resins in relation to different light-curing parameters. Design/methodology/approach: The article provides an insight on factors influencing conversion degree of composite materials. Standardized samples made of Herculite XRV based on a methacrylate resin and Filtek Silorane based on silorane resin and were cured using two types of Light Curing Units (LCUs) – halogen and LED. The samples were cured at different distances and for different times. Findings:Research has showed that the polymerization of Filtek Silorane composite is significantly slower than polymerization of Herculite XRV composite. Extending exposure time does not compensate for decrease of light intensity caused by increase of the distance of the light source from the surface of cured composite. Research limitations/implications: Further studies on degree of conversion of dental composite materials will allow to expand the knowledge on characteristics of materials used in dental clinical practice. Practical implications: Evaluation of curing methods, curing parameters and good knowledge on units used in light-curing of composite materials allow to acquire filling materials with best functional qualities. Originality/value: The paper presents degree of conversion of composite materials based on different matrixes and cured with different methods.

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The influence of light curing parameters on wear resistance of selected resin-based dental composites

Malara P., Czech Z., Świderski W.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 64, nr 2

62--71

EN

Purpose: The aim of the work was to test influence of curing time and distance of the light source on wear resistance of composite dental materials. Design/methodology/approach: The following study provides an insight into factors influencing wear resistance of composite materials. Standardized samples were made of methacrylate-based material Herculite XRV and silorane-based material Filtek Silorane and were tested using two types of Light Curing Units (LCUs) – halogen and LED. The distance of light source and time of curing differed between samples. Findings: Filtek Silorane composite compared to Herculite XRV composite guarantees higher wear resistance, regardless of the used LCU type. Using LED LCU compared to halogen LCU allows to obtain higher wear resistance both for Herculite XRV and Filtek Silorane composite. The lower the distance of light source the higher the wear resistance of composite material. Research limitations/implications: Further studies will provide additional information on other properties such as compressive strength, and degree of conversion. Practical implications: This article shows important comparison between older and newer composite technology. It provides practical information on polymerization methods. Originality/value: Article shows broad spectrum of different curing methods, important to the composite material use in dentistry.

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The effect of the curing time and the distance from the light source on hardness of Methacrylate and Silorane resin-based dental composite materials

Malara P., Czech Z., Świderski W.

Archives of Materials Science and Engineering

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2014

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Vol. 70, nr 1

28--38

EN

Purpose: The aim of the work was to test hardness of composite dental materials with different resins in relation to different light-curing parameters. Design/methodology/approach: The following article provides and insight into factors influencing hardness of composite materials. Standardized samples made of Herculite XRV based on a methacrylate resin and Filtek Silorane based on silorane resin were tested using two types of Light Curing Units (LCUs) – halogen and LED. The distance of light source and time of curing differed between samples. Findings: Filtek Silorane composite compared to Herculite XRV composite guarantees higher hardness, regardless of the used LCU type. Using LED LCU compared to halogen LCU allows to obtain higher hardness both for Herculite XRV and Filtek Silorane composite. The lower the distance of light source the higher the hardness of composite material. Research limitations/implications: Further studies will provide additional information on other properties such as compressive strength, wear resistance and light transmission. Practical implications: This article presents important comparison between older and newer composite technology. It provides practical information on polymerization methods. Originality/value: Article shows broad spectrum of different curing methods, important to the composite use in dentistry.