Properties of microfilled and visible light-cured composite resins

Raptis, C.N.; Fan, P.L.; Powers, John M.

doi:10.14219/jada.archive.1979.0365

Cited by 59 publications

(20 citation statements)

References 2 publications

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“…Composite restoratives, especially for the anterior teeth, require superior esthetic quality. Microfilled resin composites have been used for esthetic restorations, despite their lower mechanical properties 28,29) . Recently, many available composites are categorized as the hybrid type and manufacturers indicate their use for both the anterior and posterior teeth.…”

Section: Discussionmentioning

confidence: 99%

Influence of abrasive particle size on surface properties of flowable composites

et al. 2008

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The purpose of this investigation was to measure and compare both the surface roughness and gloss of flowable composites polished with standardized silicone carbide (SiC) papers. Four flowable and two conventional composites were used in this study. Polymerized specimens were subjected to a polishing procedure comprising 12 sequential steps from coarser to finer grits of SiC paper. At the initial polishing stage, flowable composites were more sensitive to the size of the polishing particles and thus yielded surfaces rougher than the conventional composites. Surface roughness became stable when polishing particles less than 13 μm size were used. However, although surface roughness was reduced, an esthetic gloss quality was not achieved on the resultant polished surface. On the influence of filler shape, composites with spherical fillers seemed to have the upper-hand advantage of attaining a high gloss by polishing. On the influence of polishing particle size, it was suggested that polishing should be completed with polishing particles less than 12 μm size so as to achieve clinically satisfactory surface roughness and gloss.

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Section: Discussionmentioning

confidence: 99%

Influence of abrasive particle size on surface properties of flowable composites

et al. 2008

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“…43 A positive correlation has been established between the hardness and the inorganic filler content of dental restorative composites. 44,45 Increased filler levels result in increased hardness numbers. 6,9 This phenomenon is quite complex, resulting from an interaction of multiple factors associated with the resin matrix and the filler particles, including particle size and distribution.…”

Section: Vickers Hardnessmentioning

confidence: 99%

Mechanical properties of new composite restorative materials

Manhart

Kunzelmann

Chen

et al. 2000

J. Biomed. Mater. Res.

208

115

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“…A spherical shape will improve the filling effects of Cry820C. 9,[15][16][17] Moreover, the lower elastic moduli of Cry820C (7.7 ± 0.2 GPa) and Cry850C (7.3 ± 0.3 GPa) compared with that of AWC (9.9 ± 0.1 GPa) are believed to be beneficial because an even stress distribution or load transmission between the prosthesis and bone is expected. 11,14,23 Although Cry820C and Cry850C were expected to exhibit differences in osteoconductivity, both composites behaved almost the same.…”

Section: Discussionmentioning

confidence: 99%

Mechanical properties and osteoconductivity of new bioactive composites consisting of partially crystallized glass beads and poly(methyl methacrylate)

Shinzato

Nakamura

Ando

et al. 2002

J. Biomed. Mater. Res.

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New bioactive composites consisting of partially crystallized glass beads as inorganic fillers and poly(methyl methacrylate) (PMMA) as an organic matrix were developed. Two kinds of partially crystallized glass beads, designated Cry820 and Cry850, were newly prepared by the heating of MgO-CaO-SiO(2)-P(2)O(5) glass at 820 and 850 degrees C, respectively. The glass beads were mixed with PMMA to form two new composites designated Cry820C and Cry850C, respectively. The goal of this study was to produce a highly osteoconductive and mechanically strong composite cement with these new fillers. A previously reported composite cement designated AWC, which was composed of apatite- and wollastonite-containing glass ceramic (AW-GC) as a powder filler and the same PMMA polymer used in the new composites, was used as a reference material. The quantity of filler added to each composite was 70 wt %. The bending strength of Cry820C was significantly higher than that of Cry850C. Composites were packed into intramedullary canals of rat tibiae to evaluate their osteoconductivity, as determined by an affinity index. The affinity index, which equaled the length of bone in direct contact with the composite surface expressed as a percentage of the total length of the composite surface, was calculated for each composite. The rats were euthanized at 4, 8, and 25 weeks after implantation. At each time interval studied, Cry820C showed a significantly higher affinity index than AWC up to 25 weeks after implantation. Cry850C showed a significantly higher affinity index than AWC up to 8 weeks and a higher affinity index than AWC at 25 weeks, although the difference was not significant. The values for each composite increased significantly with time up to 25 weeks. Our study revealed that the higher osteoconductivity of the new composites was due to the larger quantity of the glassy phase of the crystallized glass beads at the composite surface and the lower solubility of the PMMA powder to methyl methacrylate monomer. In addition, the spherical shape of the crystallized glass beads gave the new composites strong enough mechanical properties to be useful under weight-bearing conditions. The new composites show promise as alternatives, with improved properties, to conventional PMMA bone cement.

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Properties of microfilled and visible light-cured composite resins

Cited by 59 publications

References 2 publications

Influence of abrasive particle size on surface properties of flowable composites

Influence of abrasive particle size on surface properties of flowable composites

Mechanical properties of new composite restorative materials

Mechanical properties and osteoconductivity of new bioactive composites consisting of partially crystallized glass beads and poly(methyl methacrylate)

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