[The study on fabrication of dental restoration using PMMA-ZrO2 composites via CAD/CAM].
OBJECTIVE
To obtain dental restorations by machining PMMA-ZrO2 organic-inorganic composites with the dental CAD/CAM system.


METHODS
Partially sintered Zirconia compacts (PSZC) were prepared via isostatic pressing and partially sintering, with Zirconia nanopowder as raw materials. PMMA-Zirconia organic-inorganic composites were prepared by vacuum infiltrating the prepolymerized MMA into the PSZC, followed by in-situ polymerization. The mechanical properties and machinability of composites were studied. The composites were machined on the dental CAD/CAM system to obtain dental restoration.


RESULTS
At 71.44% TD of PSZC, the composite had a 3-point bending strength of (202.56 +/- 3.09) MPa, fracture toughness of (4.30 +/- 0.16) MPa.m(1/2), elasticity modulus of (58.71 +/- 1.98) GPa, and Vickers hardness of (3.82 +/- 0.34) GPa, respectively. A premolar crown was fabricated by CAD/CAM system in 16 mins, and was verisimilitude, without any cracks.


CONCLUSIONS
The composite at 71.44% TD of PSZC has good mechanical properties and dental restorations can be manufactured by PMMA-Zirconia composites via dental CAD/CAM system.
Li
Shi-bao
SB
Key Lab for Materials, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China.
Wang
Zhong-yi
ZY
Chen
Zhao-hui
ZH
Hu
Hai-feng
HF
Tang
Li-hui
LH
Ma
Chu-fan
CF
D017076:Computer-Aided Design; D003764:Dental Materials; D017266:Dental Prosthesis; D008422:Materials Testing; D019904:Polymethyl Methacrylate / Q000627:therapeutic use*; D015040:Zirconium / Q000627:therapeutic use*
D003764:Dental Materials; D019904:Polymethyl Methacrylate; D015040:Zirconium