title: [The study on fabrication of dental restoration using PMMA-ZrO2 composites via CAD/CAM].
abstract: 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.
authors.affiliation: Key Lab for Materials, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China.
authors.forename: Shi-bao
authors.initials: SB
authors.lastname: Li
authors.forename: Zhong-yi
authors.initials: ZY
authors.lastname: Wang
authors.forename: Zhao-hui
authors.initials: ZH
authors.lastname: Chen
authors.forename: Hai-feng
authors.initials: HF
authors.lastname: Hu
authors.forename: Li-hui
authors.initials: LH
authors.lastname: Tang
authors.forename: Chu-fan
authors.initials: CF
authors.lastname: Ma
mesh_terms: D017076:Computer-Aided Design; D003764:Dental Materials; D017266:Dental Prosthesis; D008422:Materials Testing; D019904:Polymethyl Methacrylate / Q000627:therapeutic use*; D015040:Zirconium / Q000627:therapeutic use*
chemical_list: D003764:Dental Materials; D019904:Polymethyl Methacrylate; D015040:Zirconium