West China Journal of Stomatology

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Effect of K2O Addition on the Crystallization Property of Dental Glass-ceramics

LIU Xiao-qiu1, SONG Wen-zhi2, SUN Hong-chen1, YANG Hai-bin3, ZOU Guang-tian3, WANG Jing-yun1, YE Chang-li4   

  1. 1. Dept. of Prosthodontics, School of Stomatology, Jilin University, Changchun 130041, China; 2. Dept. of Stomatology, China Japan Union Hospital Attached to Jilin University, Jilin University, Changchun 130031, China；3. National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China；4. Dept. of Stomatology, Liaoyuan Central Hospital, Liaoyuan 136200, China
  • Received:2006-10-25 Revised:2006-10-25 Online:2006-10-20 Published:2006-10-20

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Abstract:

Objective  To evaluate the effect of K2O addition on the crystallization property of dental glass-ceram-ics in the Li2O-SiO2-Al2O3-P2O5-ZnO system.  Methods  Different content of K2O was added into Li2O-SiO2-Al2O3-P2O5-ZnO glass system. The heat-treated system of the glass-ceramics was determined by differential thermal analyses（DTA）, then the crystallization components and the microstructure of the glass-ceramics with different content of K2O were investigated from X-ray diffraction（XRD） analyses and scanning electron microscopy（SEM）. Results  Addition of K2O helped to reduce the viscosity of the glass system and improved crystallization. More lithium disilicate crystals appeared after heated-treatment of the glass system which contained 5.3wt% addition of K2O, and the homogeneously lath-shaped crystals were 4 μm in length.  Conclusion  Certain content of K2O can improve the crystallization property of dental glass-ceramics in the Li2O-SiO2-Al2O3-P2O5-ZnO system.

Key words: K2O, glass-ceramics, crystallization

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