Effects of particle size of silica filler on polymerization conversion in a light-curing resin composite

Fujita, Kou; Ikemi, Takuji; Nishiyama, Norihiro

doi:10.1016/j.dental.2011.07.010

Cited by 84 publications

(63 citation statements)

References 14 publications

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“…Correspondingly, light transmittance in dental resin-based composites has been shown to decrease with increased filler content and for irregular filler shapes as a result of an increased specific surface area between the fillers and resin (30). Furthermore, for filler sizes ranging from 0.05-2 μm it has been demonstrated that reduced light transmission occurs due to the inability of the particles that are smaller than the wavelength of incident blue light to scatter the blue light (31). An additional aspect regarding the transmission of light through resin-based composites is the treatment of fillers (29).…”

Section: Discussionmentioning

confidence: 99%

Microtensile Bond Strength and Microhardness of Composite Resin Restorations Using a Sonic-Resin Placement System

et al. 2017

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The aim of this study was to evaluate the efficacy of applying sonic energy on microtensile bond strength and microhardness after the restoration process. A total of 40 human third molars were extracted. Class II cavities were prepared and restored with composite SonicFill or Filtek Z350 XT with and without the application of sonic energy. After the teeth were stored in water for 24 h, the teeth were sectioned into sticks (1.0 mm 2 ) and subjected to tensile testing. For a depth Knoop hardness test, the samples were cut and indentations were made sequentially from the surface of the samples to the bottom of the samples in three intervals of 1 mm each. The samples were then subjected to a load of 50 g for 10 s. The results from the tensile (factors: placement system and composite) and hardness (factors: placement system, composite and depth) tests were subjected to the Kolmogorov-Smirnov normality test, followed by analysis of variance and Tukey's test (5% significance). For the placement system factor, higher bond strength was observed for the cavities that were restored with sonic energy (p < 0.001). For depth Knoop hardness, the hardness at 1 mm depth was significantly greater than that at 3 mm depth just for the restorations with Filtek Z350 XT composite without the application of sonic energy. Therefore, the use of sonic energy during the restorative process improved bonding, yet it did not markedly affect the depth hardness for both composites.

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Section: Discussionmentioning

confidence: 99%

Microtensile Bond Strength and Microhardness of Composite Resin Restorations Using a Sonic-Resin Placement System

et al. 2017

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“…For example, light scattering is known to be greater in materials with higher filler concentration, and with larger filler (11,12). In addition, light scattering also increases in materials where the mismatch between refractive indices of the organic and inorganic portions is greater (7).…”

Section: Introductionmentioning

confidence: 99%

Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

et al. 2017

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This study aimed to evaluate the effect of the composite shade and distance from the light-curing unit (LCU) tip on the irradiance reaching the bottom of composite disks and on the depth of polymerization. Composites of three shades (opaque -OXDC, bleach -BXL, and A2) were inserted into molds with 3-mm of thickness positioned over a spectrometer and photo-activated with the LCU (Bluephase) tip placed at 0 or 1 cm from the composite surface. The mean irradiance reaching the bottom of composite was recorded during the entire photo-activation (30 s). Specimens (2 x 2 x 4 mm) were polymerized and used to map the degree of conversion achieved in different depths from irradiated surface. Specimens were sectioned into slices that were positioned over the platform of the infrared microscope connected to the spectrometer to map the conversion. The conversion was measured in eight different depths every 500-µm. Increasing the distance of LCU tip reduced the irradiance only for A2. Interposing OXDC disks resulted in lowest values of irradiance and A2 the highest one. A tendency to decrease the conversion was observed towards the bottom of specimens for all experimental conditions, and the slope was more accentuated for OXDC. Differences among shades and distances from LCU tip were evident only beyond 1.5-2.0 mm of depth. In conclusion, both composite shade and distance from LCU tip might affect the light-transmission and depth of polymerization, while the effect of last was more pronounced.

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“…3,4,5,6,7,8,11 In addition to the volumetric filler fraction and particle shape, aspects such as particle size distribution help define the behavior of the material. 4,5,6,7 Variations in the particle size may affect the absorption of the energy generated during mechanical loading, and, therefore, influence the mechanical properties of the composite. 8,11 Nonetheless, there are a small number of studies analyzing the influence of the overall inorganic phase particle size distribution on the chemicalmechanical properties of dental composites, mainly those similar to commercial materials.…”

Section: Introductionmentioning

confidence: 99%

“…The properties of resin composites can be defined by the characteristics of the organic matrix network, 1,2 the reinforcing phase 3,4,5,6,7,8,9,10,11 and the silane interphase, responsible for chemically bonding the organic and inorganic phases. 12,13,14,15,16,17 The silane interphase is most commonly composed of the 3-MPTS (γ-3-methacryloxypropyltrimethoxysilane) monomer, a bifunctional molecule capable of both polymerizing with the organic resin matrix and establishing a covalent oxane bond (Si-O-Si) with the surface of the filler particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

et al. 2015

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This study investigated the influence of silane concentration and filler size distribution on the chemical-mechanical properties of experimental composites. Experimental composites with silane contents of 0%, 1% and 3% (in relation to filler mass) and composites with mixtures of barium glass particles (median size = 0.4, 1 and 2 μm) and nanometric silica were prepared for silane and filler analyses, respectively. The degree of conversion (DC) was analyzed by FTIR. Biaxial flexural strength (BFS) was tested after 24-h or 90-d storage in water, and fracture toughness, after 24 h. The data were subjected to ANOVA and Tukey's test (p = 0.05). The DC was not significantly affected by the silane content or filler distribution. The 0% silane group had the lowest immediate BFS, and the 90-d storage time reduced the strength of the 0% and 3% groups. BFS was not affected by filler distribution, and aging decreased the BFS of all the groups. Silanization increased the fracture toughness of both the 1% and 3% groups, similarly. Significantly higher fracture toughness was observed for mixtures with 2 μm glass particles. Based on the results, 3% silane content boosted the initial strength, but was more prone to degradation after water storage. Variations in the filler distribution did not affect BFS, but fracture toughness was significantly improved by increasing the filler size.

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Effects of particle size of silica filler on polymerization conversion in a light-curing resin composite

Cited by 84 publications

References 14 publications

Microtensile Bond Strength and Microhardness of Composite Resin Restorations Using a Sonic-Resin Placement System

Microtensile Bond Strength and Microhardness of Composite Resin Restorations Using a Sonic-Resin Placement System

Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

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