Mechanical properties of a new mica-based machinable glass ceramic for CAD/CAM restorations.
Machinable ceramics (Vita Mark II and Dicor MGC) exhibit good short-term clinical performance, but long-term in vivo fracture resistance is still being monitored. The relatively low fracture toughness of currently available machinable ceramics restricts their use to conservative inlays and onlays. A new machinable glass ceramic (MGC-F) has been developed (Corning Inc.) with enhanced fluorescence and machinability. The purpose of this study was to characterize and compare key mechanical properties of MGC-F to Dicor MGC-Light, Dicor MGC-Dark, and Vita Mark II glass ceramics. The mean fracture toughness and indented biaxial flexure strength of MGC-F were each significantly greater (p < or = 0.01) than that of Dicor MGC-Light, Dicor MGC-Dark, and Vita Mark II ceramic materials. The results of this study indicate the potential for better in vivo fracture resistance of MGC-F compared with existing machinable ceramic materials for CAD/CAM restorations.
Thompson
J Y
JY
School of Dentistry, University of North Carolina, Chapel Hill, USA.
Bayne
S C
SC
Heymann
H O
HO
D000538:Aluminum Silicates / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D017076:Computer-Aided Design; D003442:Crowns; D003720:Densitometry; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D004548:Elasticity; D006244:Hardness; D007284:Inlays; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability
D000538:Aluminum Silicates; D003776:Dental Porcelain; C023506:Glass ceramics; C011934:mica