Temporary Stability of Compressive Strength of Flow and Universal Type LC PMCCS Materials

Walczak, Agata; Niewczas, A.; Pieniak, Daniel; Gil, L.; Kozłowski, Edward; Kordos, P.

doi:10.1515/adms-2017-0038

Cited by 6 publications

(3 citation statements)

References 26 publications

(25 reference statements)

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“…In real (clinical) conditions, there are also differences between patients because of, e.g., their dietary habits [26]. Thermocycling, however, offers high approximation and is frequently applied by researchers [27,28,29].…”

Section: Materials and Research Methodsmentioning

confidence: 99%

Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

et al. 2019

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This study discusses a quantitative fatigue evaluation of polymer–ceramic composites for dental restorations, i.e., commercial (Filtek Z550) and experimental Ex-nano (G), Ex-flow (G). Their evaluation is based on the following descriptors: mechanical strength, elastic modulus and strain work to fracture. Supposed to reflect factors of environmental degradation conditions, thermal fatigue was simulated with a special computer-controlled device performing algorithms of thermocycling. The specimens intended for the strength test underwent 104 hydro-thermal fatigue cycles. This procedure of thermocycling was preceded by aging, which meant immersing the specimens in artificial saliva at 37 °C for 30 days. The strength tests after aging only and after aging and thermocycles were performed in line with the three-point flexural strength (TFS) test, specified in ISO 4049, and the biaxial flexural strength (BFS) test, specifically piston-on-three-ball in accordance with ISO 6872. Based on the results, it can be stated that composites with higher volume content of inorganic particles after aging only show higher strength than materials with lower filler particle content. For example, the average flexural bending strength of the Ex-flow (G) composite was about 45% lower than the value obtained for the Ex-nano (G) material. The residual strength after thermocycles is significantly lower for the experimental composites, whereas a smaller decrease in strength is recorded for the commercial composites. Decreases in strength were about 4% (Filtek Z550), 43% (Ex-nano (G)), and 29% (Ex-flow (G)) for the BFS test; and about 17% (Filtek Z550), 55% (Ex-nano (G)), 60% (Ex-flow (G)) for the TFS test. The elastic modulus of the experimental composites after only aging is higher (about 42%) than that of the commercial composite, but the elastic modulus of the commercial composite increases significantly after thermocycling. A descriptor known as strain work to fracture turns out to be a good descriptor for evaluating the hydro-thermal fatigue of the tested polymer–ceramic composites.

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Section: Materials and Research Methodsmentioning

confidence: 99%

Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

et al. 2019

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“…The inorganic phase is of key importance for the performance of resin composites. Not only its contribution to the structure of the composite, but also its shape, type, and size are significant [4].…”

Section: Introductionmentioning

confidence: 99%

Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

Pieniak

Walczak

et al. 2020

Materials

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This study discusses a quantitative fatigue evaluation of polymer–ceramic composites for dental restorations, i.e., commercial material (Filtek Z550) and experimental materials Ex-nano (G), Ex-flow (G). Their evaluation is based on the following descriptors: microhardness, scratch resistance, and sliding wear. In order to reflect factors of environmental degradation conditions, thermal fatigue was simulated with a special computer-controlled device performing algorithms of thermocycling. Specimens intended for the surface strength and wear tests underwent 104 hydrothermal fatigue cycles. Thermocycling was preceded by aging, which meant immersing the specimens in artificial saliva at 37 °C for 30 days. Microhardness tests were performed with the Vickers hardness test method. The scratch test was done with a Rockwell diamond cone indenter. Sliding ball-on-disc friction tests were performed against an alumina ball in the presence of artificial saliva. A direct positive correlation was found between thermocycling fatigue and microhardness. The dominant mechanism of the wear of the experimental composites after thermocycling is the removal of fragments of the materials in the form of flakes from the friction surface (spalling). Hydrothermal fatigue is synergistic with mechanical fatigue.

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“…The result were on Table 3, and they concluded that Filtek Z500 has the highest compressive strength. Filtek Z500 contained nano particles and micro particles, however the other group has only micro size particles [56].…”

Section: Mechanical Properties Of the Commercial Dental Compositesmentioning

confidence: 95%

Mechanical and Optical Properties of the Experimental and Commercial Dental Composites: A Systematic Review

Karlina

Panatarani

Djustiana

et al. 2021

AEF

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Highly demand of aesthetic needed made dental composites become a major role as dental restorations. Minimal invasive of sound tissue and the ability to mimic the original teeth also have the recommendation to choose dental composites. The developments of dental composites mostly focus on filler systems to improve mainly in the mechanical and optical properties due to the esthetic aspect of dental care recently has become increasing importance. According to the component of dental composites, the fillers had a big role to determine the properties of dental composite. Many kinds of fillers have been utilized to improve the properties. Two kinds of dental composites had been known based on their fabrication procedure; i.e. experimental and commercial. The experimental dental composites had been produced by the researcher on their formula to obtain good properties while commercial dental composites were made by many manufacturers which have each brand that has each product of excellence, especially in mechanical and optical properties. The aim of this review focused on the mechanical and optical properties of experimental dental composites and commercial dental composites including describes many factors that affect those properties.

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Temporary Stability of Compressive Strength of Flow and Universal Type LC PMCCS Materials

Cited by 6 publications

References 26 publications

Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

Mechanical and Optical Properties of the Experimental and Commercial Dental Composites: A Systematic Review

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