Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Delfino, Carina Sinclér; Youssef, Michel Nicolau; Souza, Fábio Barbosa de; Braz, Rodivan; Turbino, Miriam Lacalle

doi:10.1016/j.ijleo.2010.11.036

Cited by 4 publications

(6 citation statements)

References 22 publications

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“…Although debatable, photoactivation with argon laser is a quick procedure and, according to some studies [17,18,35], provides a more uniform polymerization in relation to light sources; this statement supports the result found in this study. In addition, the study by Guimarães [36], where enamel surfaces of human teeth were treated with argon laser, at similar power and dose to the present study (250mW and 8J/cm2), an increase in enamel crystallinity and surface smoothness was observed, suggestive factors of elevation of caries resistance in tooth enamel.…”

Section: Discussionsupporting

confidence: 90%

“…The argon laser is located in the visible spectrum in the blue-green light range and is capable of polymerizing composite resins through the blue wavelength of 488nm. The main uses of the argon laser in Orthodontics are: reducing the polymerization time during orthodontic bonding and increasing the resistance to tooth decay in tooth enamel [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The use of argon laser for polymerization is little studied in the literature, and there is no consensus regarding the protocol to be applied in the dental clinic, as research shows divergent results, as well as different methodologies, which makes it difficult to establish a protocol to be followed, and also raises doubts regarding the viability and efficiency of this light source [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

Melo

Youssef

2021

J. Dentists

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objective: The aim of this work was to evaluate the shear strength of ceramic brackets as a function of two adhesive systems (kit TransbondTM XT; TransbondTM Plus Self Etching Primer/ 3M Unitek®) and two light sources (LED and Argon Laser). Method: 28 maxillary premolars were used, divided into two groups (n=14), according to the adhesive system and light source. The teeth were enclosed in ¾-inch PVC tubes, with special stone plaster, perpendicular to the ground and tubes. Brackets were fixed over the exposed crowns. The teeth were stored at 37ºC for 24 hours and then submitted to 1,000 thermal cycles with 30 seconds in each bath (5°C and 55°C). The shear test was performed on a Shimadzu® testing machine at a speed of 0.5mm/min. Enamel surfaces were qualified using the ARI (Adhesive Remaining Index). Data were submitted to statistical analyzes ANOVA, Tukey and Kruskal-Wallis (p<0.05). Results: the conventional TransbondTM XT kit adhesive system was superior to the self-etching system. LED and Argon Laser showed similar behaviors. Conclusion: Argon laser did not influence shear strength or ARI scores.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

Melo

Youssef

2021

J. Dentists

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“…Microhardness testing is a method used for indirect assessment of some clinically important properties of composites [40][41][42][43][44]. Microhardness tests were conducted using disc-shaped specimens, according to the ISO4049 standard.…”

Section: Microhardness Testingmentioning

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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“…Microhardness is a key mechanical parameter of soft materials and plays a significant role in assessing their resistance to permanent distortions when exposed to external forces. The exploration of microhardness has attracted significant attention owing to its capacity to elevate mechanical attributes and characteristics linked with structural chemistry [1][2][3]. One intriguing application is in the realm of glassy substances, where the Vickers hardness H v is of utmost importance for the development of scratch-resistant protective sheets.…”

Section: Introductionmentioning

confidence: 99%

Impact of micro-indentation load/time and Zinc concentration on the thermo- mechanical characteristics of amorphous Se₇₈Te₂₀Sn₂ alloy

Saraswat,

Dahshan,

Elsaeedy

et al. 2024

Phys. Scr.

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We have performed hardness measurement experiments under different loads and loading times by performing micro-indentation marks in the present work. Chalcogenide glasses (ChGs) comprising Se78Te20Sn2 and Se78-xTe20Sn2Znx (where x = 0, 2, 4, & 6) alloys are the subject of micro-indentation tests in this work. We have utilized both micro-indentation and optical microscopic methods to determine Vickers hardness. Thermal glass transition phenomena have been identified through DSC techniques. The modulus of elasticity (E), an essential mechanical property, has been evaluated using established empirical equations. Further, we have studied other mechanical parameters [e.g., minimal micro-void formation energy (Eh), glass's fragility index (m), micro-void volume (Vh), etc.] and the covalent character of the glassy system. Additionally, various physical parameters, including density, molar volume, and compactness, have also been determined.

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Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Cited by 4 publications

References 22 publications

Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

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

Impact of micro-indentation load/time and Zinc concentration on the thermo- mechanical characteristics of amorphous Se₇₈Te₂₀Sn₂ alloy

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Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Cited by 4 publications

References 22 publications

Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

Influence of Polymerization with Argon Laser and LED on Shear Resistance of Adhesive Systems

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

Impact of micro-indentation load/time and Zinc concentration on the thermo- mechanical characteristics of amorphous Se78Te20Sn2 alloy

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Product

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Impact of micro-indentation load/time and Zinc concentration on the thermo- mechanical characteristics of amorphous Se₇₈Te₂₀Sn₂ alloy