[Study on high strength mica-based machinable glass-ceramic].
The phase constitution, microstructure and properties of a new type of machinable glass-ceramics containing fluorophlogopite-type (FPT) Ca-mica for used in restorative dentistry were investigated. According to the results of X-ray diffraction (XRD) and energy-dispersive spectrometry(EDS), its main crystalline phases were FPT Ca-mica and t-ZrO2, together with few KxCa(1-x)/2Mg2Si4O10F2, m-ZrO2. The flexible strength was 235 MPa, which was nearly two times larger than that of the present mica-based dental materials, and the highest fracture toughness was 2.17 MPa.m1/2. The microstructure had a great effect on properties, the glass-ceramics contained a large volume, and the fine crystals showed higher strength. The material possessed typical microstructure of machinable glass-ceramics and displayed excellent machinability during drilling test and CAD/CAM.
Li
Hong
H
Department of Biomedical Engineering, Sichuan University, Chengdu 610065, China.
Ran
Junguo
J
Gou
Li
L
Wang
Fanghu
F
D000538:Aluminum Silicates; D001696:Biomechanical Phenomena; D002516:Ceramics; D003764:Dental Materials; D006244:Hardness; D008422:Materials Testing
D000538:Aluminum Silicates; D003764:Dental Materials; C023506:Glass ceramics; C011934:mica