[Coloration of mica glass ceramic for use in dental CAD/CAM system].
OBJECTIVE
An intrinsically colored machinable glass-ceramic containing tetrasilicic fluormica as the predominant crystal phase was studied, which was used in molar crown in dental CAD/CAM system.


METHODS
Orthogonal design analysis was used to select appropriate base formula, coloration and heat treatment process.


RESULTS
Factors influencing the color appearance of mica glass ceramic were nucleation agent and the ratio of Mg(2+) to K(+) in base formula; Cerium oxide (CeO(2)) was used as the main coloration; The preferred heat treatment was 650 degrees C for 1 h and 1,000 degrees C or 1,050 degrees C for 3 h - 4 h.


CONCLUSIONS
This mica glass-ceramic could provide 4 to 5 color appearance for dental use, it showed excellent machinability which was eminently suitable for use in dental CAD/CAM system.
Sun
Ying
Y
Depatment of Prosthodontics, College of Stomatology, Fourth Military Medical University, Xian 710032, China.
Wang
Zhong-yi
ZY
Tian
Jie-mo
JM
Cao
Xiao-gang
XG
D000538:Aluminum Silicates / Q000737:chemistry*; D003116:Color; D017076:Computer-Aided Design; D003442:Crowns; D003776:Dental Porcelain / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008963:Molar
D000538:Aluminum Silicates; D003776:Dental Porcelain; C011934:mica