[Machinable property of a novel dental mica glass-ceramic]

Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Dec;42(12):750-3.
[Article in Chinese]

Abstract

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.

Publication types

  • English Abstract
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aluminum Silicates / chemistry
  • Crystallization
  • Dental Porcelain* / chemistry
  • Glass / chemistry
  • Materials Testing*
  • Microscopy, Electron, Scanning
  • Pliability
  • X-Ray Diffraction

Substances

  • Aluminum Silicates
  • Dental Porcelain
  • mica