[Machinable property of a novel dental mica glass-ceramic].
OBJECTIVE
To investigate the machinability of a novel dental mica glass-ceramic and analyze the effect of heat-treatment on its ductile machinable behavior.


METHODS
The drilling and turning experiment were used to measure the machinabilities of the control group (feldspar ceramic: Vita Mark II) and 7 experiment groups treated with different crystallization techniques. The microstructures were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD).


RESULTS
The average drilling depths in 30 s of the experimental groups ranged from (0.5 +/- 0.1) mm to (7.1 +/- 0.8) mm. There were significant differences between the control [(0.8 +/- 0.1) mm] and the experimental groups (P < 0.05) except the group crystallized at 740 degrees C for 60 min. When crystallized at 650 degrees C (60 min), continuous band chips could formed in machining at a high velocity and cut depth. The crystal portion of this group is only about 40%.


CONCLUSIONS
This material has a satisfactory machinability. The mechanism could be attributed to a combination of the interlocked structure of mica crystals and the low viscosity of glassy phase.
Chen
Ji-hua
JH
Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China. jhchen@fmmu.edu.cn
Li
Na
N
Ma
Xin-pei
XP
Zhao
Ying-hua
YH
Sun
Xiang
X
Li
Guang-xin
GX
D000538:Aluminum Silicates / Q000737:chemistry; D003460:Crystallization; D003776:Dental Porcelain / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D014961:X-Ray Diffraction
D000538:Aluminum Silicates; D003776:Dental Porcelain; C011934:mica