Mechanical Properties of Alumina-Glass Dental Composites

Zhu, Qizhen; Dortmans, L.J.M.G.; Feenstra, Frits

doi:10.4028/www.scientific.net/kem.206-213.1603

Cited by 3 publications

(4 citation statements)

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“…These pores are mainly attributed to sintering-induced closed pores that could not be reached by the molten glass during the infiltration process. 23 SEM analyses revealed that the microstructure of the present alumina-glass composite is similar to that of the In-Ceram alumina-glass composites. In-Ceram alumina-glass composites also have ϳ5 vol.% porosity and similar defect sizes, as revealed by the present study and other investigations.…”

Section: Resultsmentioning

confidence: 80%

Subcritical crack growth behavior of Al₂O₃‐glass dental composites

Zhu

Dortmans²,

Feenstra

2003

J Biomed Mater Res

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The purpose of this study is to investigate the subcritical crack growth (SCG) behavior of alumina-glass dental composites. Alumina-glass composites were fabricated by infiltrating molten glass to porous alumina preforms. Rectangular bars of the composite were subject to dynamic loading in air, with stressing rates ranging from 0.01 MPa/s to 2 MPa/s. The SCG parameter n was determined to be 22.1 for the composite, which is substantially lower than those of high-purity dense alumina. Investigations showed that glass phases are responsible for the low n value as cracks propagate preferentially within glass phases or along the interface between glass phases and alumina phases, due to the fact that glasses are more vulnerable to chemical attacks by water molecules under stress corrosion conditions. The SCG behavior of the infiltration glass was also investigated and the SCG parameter n was determined to be 18.7.

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Section: Resultsmentioning

confidence: 80%

Subcritical crack growth behavior of Al₂O₃‐glass dental composites

Zhu

Dortmans²,

Feenstra

2003

J Biomed Mater Res

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“…In particular, robocasting scaffolds have been fabricated from β‐tricalcium phosphate10 (β‐TCP) and hydroxyapatite11 (HA) powders. Both these works focused on the processing route, and hence little effort has been devoted to characterizing the mechanical behavior of this type of scaffold—the only mechanical studies in the literature about robocasting materials deal either with dense monoliths12 or infiltrated composites 13…”

Section: Introductionmentioning

confidence: 99%

Fracture modes under uniaxial compression in hydroxyapatite scaffolds fabricated by robocasting

Miranda

Pajares

Saiz

et al. 2007

J Biomedical Materials Res

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The fracture modes of hydroxyapatite (HA) scaffolds fabricated by direct-write assembly (robocasting) are analyzed in this work. Concentrated HA inks with suitable viscoelastic properties were developed to enable the fabrication of prototype structures consisting of a 3-D square mesh of interpenetrating rods. The fracture behavior of these model scaffolds under compressive stresses is determined from in situ uniaxial tests performed in two different directions: perpendicular to the rods and along one of the rod directions. The results are analyzed in terms of the stress field calculated by finite element modeling (FEM). This analysis provides valuable insight into the mechanical behavior of scaffolds for bone tissue engineering applications fabricated by robocasting.

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“…7 For further reduction of the shrinkage, it is essential to lower both the presintering and the infiltration temperature. Many studies on melt-infiltrated alumina glass composites have been reported in literature, 3,4,[9][10][11] but all the glasses used in these investigations are based on the lanthanum-aluminosilicate glass, 7 where a minimum infiltration temperature of 1100 • C is required. Therefore, in order to reduce the fabrication temperature, it is necessary to develop new glasses that allow infiltrating alumina at lower temperature.…”

Section: Introductionmentioning

confidence: 99%

“…3,4 Many of these applications require complex shapes with well controlled dimensions. For example, dimensional tolerances of less than 0.1% are normally demanded by these applications.…”

Section: Introductionmentioning

confidence: 99%