TY - GEN
T1 - Effect of heat treatment time on properties of mica-based glass-ceramics for restorative dental materials
AU - Srichumpong, Thapanee
AU - Suputtamongkol, Kallaya
AU - Chinpanuwat, Warat
AU - Nampachoke, Pronbadin
AU - Bai, Jia
AU - Angkulpipat, Sukanda
AU - Prasertwong, Sahadsaya
AU - Chaysuwan, Duangrudee
N1 - Publisher Copyright:
© 2016 Trans Tech Publications, Switzerland.
PY - 2016
Y1 - 2016
N2 - The objective of this research is to focus improving the properties of machinable micabased glass-ceramics in order for restorative dental materials. The glass-ceramics derived from the SiO2-Al2O3-MgO-MgF2-SrCO3-CaCO3-CaF2-P2O5 system were produced by a two-stage heat treatment. It was elucidated that the optimum nucleation and the crystallization temperatures were at 643°C and 892°C. The various heat treatment times in the first stage were applied as 3, 6, 12, 24, 48 and 72 h, respectively, on the optimum nucleation temperature to produce mica-based glassceramics. XRD results showed that specimens of variety of nucleation time had similar crystalline structures such as calcium-mica, fluorapatite, stishovite, anorthite, strontiumapatite and forsterite phases. The microstructures of glass-ceramics were observed by SEM basically as interlocked plate-like and needle-like microstructures of mica and fluorapatite, respectively, in all specimens. Furthermore, different heat treatment times influenced on the revealed crystal size of the glassceramics; the longer heat treatment, the smaller crystals. The resultant glass-ceramics gave the results of biaxial flexural strength (178-224 MPa) and Vickers hardness (295-393 HV) increasing with the formation of the interconnected mica phases which contributed to improve the machinability. The values of the properties were comparable to those of human enamel and suitable for some restorative dental applications.
AB - The objective of this research is to focus improving the properties of machinable micabased glass-ceramics in order for restorative dental materials. The glass-ceramics derived from the SiO2-Al2O3-MgO-MgF2-SrCO3-CaCO3-CaF2-P2O5 system were produced by a two-stage heat treatment. It was elucidated that the optimum nucleation and the crystallization temperatures were at 643°C and 892°C. The various heat treatment times in the first stage were applied as 3, 6, 12, 24, 48 and 72 h, respectively, on the optimum nucleation temperature to produce mica-based glassceramics. XRD results showed that specimens of variety of nucleation time had similar crystalline structures such as calcium-mica, fluorapatite, stishovite, anorthite, strontiumapatite and forsterite phases. The microstructures of glass-ceramics were observed by SEM basically as interlocked plate-like and needle-like microstructures of mica and fluorapatite, respectively, in all specimens. Furthermore, different heat treatment times influenced on the revealed crystal size of the glassceramics; the longer heat treatment, the smaller crystals. The resultant glass-ceramics gave the results of biaxial flexural strength (178-224 MPa) and Vickers hardness (295-393 HV) increasing with the formation of the interconnected mica phases which contributed to improve the machinability. The values of the properties were comparable to those of human enamel and suitable for some restorative dental applications.
KW - Biaxial flexural strength
KW - Mica-based glass-ceramics
KW - Nucleation time
KW - Restorative dental material
UR - http://www.scopus.com/inward/record.url?scp=84979645594&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.702.23
DO - 10.4028/www.scientific.net/KEM.702.23
M3 - Conference contribution
AN - SCOPUS:84979645594
SN - 9783035710489
T3 - Key Engineering Materials
SP - 23
EP - 27
BT - Glass Science and Technology
A2 - Jitwatcharakomol, Tepiwan
A2 - Tapasa, Kanit
A2 - Meechoowas, Ekarat
PB - Trans Tech Publications Ltd
T2 - International Commission on the ICG Annual Meeting, ICG 2015
Y2 - 20 September 2015 through 23 September 2015
ER -