Study on high strength mica-based machinable glass-ceramic.
- Author:
Hong LI
1
;
Junguo RAN
;
Li GOU
;
Fanghu WANG
Author Information
1. Department of Biomedical Engineering, Sichuan University, Chengdu 610065, China.
- Publication Type:Journal Article
- MeSH:
Aluminum Silicates;
Biomechanical Phenomena;
Ceramics;
Dental Materials;
Hardness;
Materials Testing
- From:
Journal of Biomedical Engineering
2004;21(1):54-61
- CountryChina
- Language:Chinese
-
Abstract:
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.
