Fabrication and characterization of sol–gel derived 45S5 Bioglass®–ceramic scaffolds

Qizhi Chen, George Thouas

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Although Bioglass® has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO2–CaO bioactive glasses. The sol–gel process of producing glass foams is well established for SiO2–CaO compositions, but not yet established for 45S5 composites containing Na2O. In this work the sol–gel derived 45S5 Bioglass® has for the first time been foamed into highly porous three-dimensional scaffolds using a surfactant, combined with vigorous mechanical stirring and subsequent sintering at 1000 °C for 2 h. It was found that the mechanical strength of the sintered sol–gel derived Bioglass® scaffolds was significantly improved, attributable to the small fraction of material on the pore walls. More importantly, the compressive strength of the three-dimensional scaffolds produced by this surfactant foaming method could be predicted using Gibson and Ashby’s closed cell model of porous networks. A comparative experiment revealed that ion release from the sol–gel derived Bioglass® foams was faster than that of counterparts produced by the replication technique. In vitro evaluation using osteoblast-like cells demonstrated that the sol–gel derived 45S5 Bioglass foams supported the proliferation of viable cell populations on the surface of the scaffolds, although few cells were observed to migrate into the virtually closed pores within the foams. Further work should be focused on modifications of the reaction conditions or alternative foaming techniques to improve pore interconnection.
Original languageEnglish
Pages (from-to)3616 - 3626
Number of pages11
JournalActa Biomaterialia
Volume7
Issue number10
DOIs
Publication statusPublished - 2011

Cite this

Chen, Qizhi ; Thouas, George. / Fabrication and characterization of sol–gel derived 45S5 Bioglass®–ceramic scaffolds. In: Acta Biomaterialia. 2011 ; Vol. 7, No. 10. pp. 3616 - 3626.
@article{908efb756ae041da8c4073b2fe4bbaca,
title = "Fabrication and characterization of sol–gel derived 45S5 Bioglass{\circledR}–ceramic scaffolds",
abstract = "Although Bioglass{\circledR} has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO2–CaO bioactive glasses. The sol–gel process of producing glass foams is well established for SiO2–CaO compositions, but not yet established for 45S5 composites containing Na2O. In this work the sol–gel derived 45S5 Bioglass{\circledR} has for the first time been foamed into highly porous three-dimensional scaffolds using a surfactant, combined with vigorous mechanical stirring and subsequent sintering at 1000 °C for 2 h. It was found that the mechanical strength of the sintered sol–gel derived Bioglass{\circledR} scaffolds was significantly improved, attributable to the small fraction of material on the pore walls. More importantly, the compressive strength of the three-dimensional scaffolds produced by this surfactant foaming method could be predicted using Gibson and Ashby’s closed cell model of porous networks. A comparative experiment revealed that ion release from the sol–gel derived Bioglass{\circledR} foams was faster than that of counterparts produced by the replication technique. In vitro evaluation using osteoblast-like cells demonstrated that the sol–gel derived 45S5 Bioglass foams supported the proliferation of viable cell populations on the surface of the scaffolds, although few cells were observed to migrate into the virtually closed pores within the foams. Further work should be focused on modifications of the reaction conditions or alternative foaming techniques to improve pore interconnection.",
author = "Qizhi Chen and George Thouas",
year = "2011",
doi = "10.1016/j.actbio.2011.06.005",
language = "English",
volume = "7",
pages = "3616 -- 3626",
journal = "Acta Biomaterialia",
issn = "1742-7061",
publisher = "Elsevier",
number = "10",

}

Fabrication and characterization of sol–gel derived 45S5 Bioglass®–ceramic scaffolds. / Chen, Qizhi; Thouas, George.

In: Acta Biomaterialia, Vol. 7, No. 10, 2011, p. 3616 - 3626.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Fabrication and characterization of sol–gel derived 45S5 Bioglass®–ceramic scaffolds

AU - Chen, Qizhi

AU - Thouas, George

PY - 2011

Y1 - 2011

N2 - Although Bioglass® has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO2–CaO bioactive glasses. The sol–gel process of producing glass foams is well established for SiO2–CaO compositions, but not yet established for 45S5 composites containing Na2O. In this work the sol–gel derived 45S5 Bioglass® has for the first time been foamed into highly porous three-dimensional scaffolds using a surfactant, combined with vigorous mechanical stirring and subsequent sintering at 1000 °C for 2 h. It was found that the mechanical strength of the sintered sol–gel derived Bioglass® scaffolds was significantly improved, attributable to the small fraction of material on the pore walls. More importantly, the compressive strength of the three-dimensional scaffolds produced by this surfactant foaming method could be predicted using Gibson and Ashby’s closed cell model of porous networks. A comparative experiment revealed that ion release from the sol–gel derived Bioglass® foams was faster than that of counterparts produced by the replication technique. In vitro evaluation using osteoblast-like cells demonstrated that the sol–gel derived 45S5 Bioglass foams supported the proliferation of viable cell populations on the surface of the scaffolds, although few cells were observed to migrate into the virtually closed pores within the foams. Further work should be focused on modifications of the reaction conditions or alternative foaming techniques to improve pore interconnection.

AB - Although Bioglass® has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO2–CaO bioactive glasses. The sol–gel process of producing glass foams is well established for SiO2–CaO compositions, but not yet established for 45S5 composites containing Na2O. In this work the sol–gel derived 45S5 Bioglass® has for the first time been foamed into highly porous three-dimensional scaffolds using a surfactant, combined with vigorous mechanical stirring and subsequent sintering at 1000 °C for 2 h. It was found that the mechanical strength of the sintered sol–gel derived Bioglass® scaffolds was significantly improved, attributable to the small fraction of material on the pore walls. More importantly, the compressive strength of the three-dimensional scaffolds produced by this surfactant foaming method could be predicted using Gibson and Ashby’s closed cell model of porous networks. A comparative experiment revealed that ion release from the sol–gel derived Bioglass® foams was faster than that of counterparts produced by the replication technique. In vitro evaluation using osteoblast-like cells demonstrated that the sol–gel derived 45S5 Bioglass foams supported the proliferation of viable cell populations on the surface of the scaffolds, although few cells were observed to migrate into the virtually closed pores within the foams. Further work should be focused on modifications of the reaction conditions or alternative foaming techniques to improve pore interconnection.

UR - http://www.elsevier.com/locate/actabiomat

U2 - 10.1016/j.actbio.2011.06.005

DO - 10.1016/j.actbio.2011.06.005

M3 - Article

VL - 7

SP - 3616

EP - 3626

JO - Acta Biomaterialia

JF - Acta Biomaterialia

SN - 1742-7061

IS - 10

ER -