Journal article
Low temperature sintering of fluorapatite glass-ceramics
Dental materials, Vol.30(2), pp.112-121
02/2014
DOI: 10.1016/j.dental.2013.10.009
PMCID: PMC3899825
PMID: 24252652
Abstract
Fluorapatite glass-ceramics have been shown to be excellent candidates as scaffold materials for bone grafts, however, scaffold production by sintering is hindered by concurrent crystallization of the glass. Objective, our goal was to investigate the effect of Ca/Al ratio on the sintering behavior of Nb-doped fluorapatite-based glasses in the SiO2-Al2O3-P2O5-MgO-Na2O-K2O-CaO-CaF2 system. Methods, glass compositions with Ca/Al ratio of 1 (A), 2 (B), 4 (C) and 19 (D) were prepared by twice melting at 1525°C for 3h. Glasses were either cast as cylindrical ingots or ground into powders. Disk-shaped specimens were prepared by either sectioning from the ingots or powder-compacting in a mold, followed by heat treatment at temperatures ranging between 700 and 1050°C for 1h. The density was measured on both sintered specimens and heat treated discs as controls. The degree of sintering was determined from these measurements. Results and Significance XRD showed that fluorapatite crystallized in all glass-ceramics. A high degree of sintering was achieved at 775°C for glass-ceramic D (98.99±0.04%), and 900°C for glass-ceramic C (91.31±0.10). Glass-ceramics A or B were only partially sintered at 1000°C (63.6±0.8% and 74.1±1.5%, respectively). SEM revealed a unique microstructure of micron-sized spherulitic fluorapatite crystals in glass-ceramics C and D. Increasing the Ca/Al ratio promoted low temperature sintering of fluorapatite glass-ceramics, which are traditionally difficult to sinter.
Details
- Title: Subtitle
- Low temperature sintering of fluorapatite glass-ceramics
- Creators
- Isabelle Denry - The University of Iowa College of Dentistry, Department of Prosthodontics & Dows Institute for Dental Research, Iowa City, IA, USA. Electronic address: Isabelle-Denry@uiowa.eduJulie A Holloway - The University of Iowa College of Dentistry, Department of Prosthodontics & Dows Institute for Dental Research, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Dental materials, Vol.30(2), pp.112-121
- DOI
- 10.1016/j.dental.2013.10.009
- PMID
- 24252652
- PMCID
- PMC3899825
- NLM abbreviation
- Dent Mater
- ISSN
- 0109-5641
- eISSN
- 1879-0097
- Publisher
- England
- Grant note
- R01 DE019972 / NIDCR NIH HHS\nR01-DE19972 / NIDCR NIH HHS
- Language
- English
- Date published
- 02/2014
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Prosthodontics; Dental Research
- Record Identifier
- 9984065991702771
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