Particulate-Filled Composites

Plueddemann, Edwin P.

doi:10.1007/978-1-4899-0342-6_7

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…29,30 AW-GC powder has silica in its chemical composition and it is able to form siloxane bonds on its surface; however, neither HA nor TCP powder has silica, which may cause poor bonding in the substrate-coupling agent phase. We think that the stronger bonding of the substrate-coupling phase of AWC leads to its stronger mechanical properties compared to HAC and TCPC.…”

Section: Discussionmentioning

confidence: 99%

Bioactive bone cement: Comparison of apatite and wollastonite containing glass-ceramic, hydroxyapatite, and ?-tricalcium phosphate fillers on bone-bonding strength

Kobayashi

Nakamura

Okada

et al. 1998

J. Biomed. Mater. Res.

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A study was conducted to compare the bone-bonding strengths of three types of bioactive bone cement, consisting of either apatite- and wollastonite-containing glass-ceramic (AW-GC) powder, hydroxyapatite (HA) powder, or beta-tricalcium phosphate (beta-TCP) powder as an inorganic filler and bisphenol-a-glycidyl methacrylate (Bis-GMA) based resin as an organic matrix. Seventy percent (w/w) filler was added to the cement. Rectangular plates (10 x 15 x 2 mm) of each cement were made and abraded with #2000 alumina powder. After soaking in simulated body fluid for 2 days, the AW cement (AWC) and HA cement (HAC) formed bonelike apatite over their entire surfaces, but the TCP cement (TCPC) did not. Plates of each type of cement were implanted into the tibial metaphyses of male Japanese white rabbits, and the failure loads were measured by a detaching test at 10 and 25 weeks after implantation. The failure loads of AWC, HAC, and TCPC were 3.95, 2.04, and 2.03 kgf at 10 weeks and 4.36, 3.45, and 3.10 kgf at 25 weeks, respectively. The failure loads of the AWC were significantly higher than those of the HAC and TCPC at 10 and 25 weeks. Histological examination by contact microradiogram and Giemsa surface staining of the bone-cement interface revealed that all the bioactive bone cements were in direct contact with bone. However, scanning electron microscopy and energy-dispersive X-ray microanalysis showed that only AWC had contacted to the bone via a Ca-P rich layer formed at the interface between the AW-GC powder and the bone, which might explain its high bone-bonding strength. Neither the HAC nor the TCPC contacted the bone through such a layer between each powder and the bone, although the HAC and TCPC directly contacted with bone. Our results indicate that all three types of abraded and prefabricated cement have bonding strength to bone, but AWC has superior bone-bonding strength compared to HAC and TCPC.

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Section: Discussionmentioning

confidence: 99%

Bioactive bone cement: Comparison of apatite and wollastonite containing glass-ceramic, hydroxyapatite, and ?-tricalcium phosphate fillers on bone-bonding strength

Kobayashi

Nakamura

Okada

et al. 1998

J. Biomed. Mater. Res.

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“…However, if silica fillers were initially prepared with organofunctional silane coupling agents and then irradiated, the blends mixed with these fillers will improve their mechanical behavior. Plueddemann emphasizes that failures of filled resins frequently occur in a boundary layer of filler or matrix (Plueddemann, 1982). Silane coupling agents are generally used to solve these problems.…”

Section: Discussionmentioning

confidence: 99%

“…The surface modification of fillers improves their rheology, viscosity, and flow during application of the restorative. The treatment of the filler surface is the key to the interaction with the resin matrix (Plueddemann, 1982;Arkles, 2004). Silane coupling agents are frequently used to influence the mixing behavior as well as the filler-to-matrix bond.…”

Section: Introductionmentioning

confidence: 99%

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Flexural strength of experimentally filled resins made of electron beam irradiated silica fillers

Behr

Rosentritt

Hagenbuch

et al. 2009

Journal of the Mechanical Behavior of Biomedical Materials

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“…These results indicate that stronger bonding of the substrate-coupling phase in SGC than in ABC lead to the improved physical properties of this composite. 30 It is generally accepted that maximal siloxane bond (Si-O-Si) formation is required to obtain maximum effectiveness with silane-coupling agents as adhesion promotors. 31 Therefore, it is clear that SG-P was better silane-treated than AL-P.…”

Section: Discussionmentioning

confidence: 99%

Direct bone formation on alumina bead composite

Kobayashi

Kikutani

Nakamura

1997

J. Biomed. Mater. Res.

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We have developed a composite (designated ABC), consisting of alumina bead powder as an inorganic filler and bisphenol-alpha-glycidyl methacrylate (Bis-GMA)-based resin as an organic matrix, which allows direct bone formation on its surface in vivo. Alumina bead powder was manufactured by fusing crushed alpha-alumina powder and quenching it. The beads took spherical form 3 microns in average size. According to powder X-ray diffraction and Fourier transform infrared spectroscopy, the alumina bead powder was composed of amorphous and delta-crystal phases of alumina in its main crystal structure. Fused-quenched silica glass-filled composite (SGC) was used as a control. The proportion of filler added to the composites was 70% w/w. Mechanical testing of the ABC indicated that it would be strong enough for use under weight-bearing conditions. No apatite formation was detected on the surfaces of either composite after soaking in simulated body fluid for 28 days in vitro. Histological examination of rat tibiae for up to 8 weeks revealed that ABC bonded to bone directly via a layer of calcium, phosphorus, and alumina with no interposed soft-tissue layer. Moreover, the amount of bone directly apposed to the ABC surface increased with time, whereas with SGC there was poor direct bone formation even at 8 weeks. The precise mechanism of direct bone formation on ABC is as yet unknown but it is possible that changes in the crystallinity of alumina, which is known to be highly biocompatible, contribute to its excellent osteoconductivity in vivo. Although bioactive materials such as Bioglass or apatite and wollastonite-containing glass-ceramic have previously been reported to form bone-like apatite on their surfaces under acellular conditions via simple chemical reactions, ABC does not have such characteristics, and presenting favorable conditions for osteoconduction and tissue calcification may lead to direct bone formation on its surface in vivo.

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Particulate-Filled Composites

Cited by 7 publications

References 9 publications

Bioactive bone cement: Comparison of apatite and wollastonite containing glass-ceramic, hydroxyapatite, and ?-tricalcium phosphate fillers on bone-bonding strength

Bioactive bone cement: Comparison of apatite and wollastonite containing glass-ceramic, hydroxyapatite, and ?-tricalcium phosphate fillers on bone-bonding strength

Flexural strength of experimentally filled resins made of electron beam irradiated silica fillers

Direct bone formation on alumina bead composite

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