title: [Effect of particle size distribution of dental poly (methyl methacrylate) beads on the microstructure of denture].
abstract: OBJECTIVE
  To investigate the effect of particle size distribution (PSD) of dental poly (methyl methacrylate) (PMMA) beads on the microstructure of denture.
  
  
  METHODS
  It was compared and analyzed that the porosity of three groups of spherical specimens which were made of PMMA beads with different PSD at proper polymer/monomer ratios. And the final microstructure of each group was investigated using Digital High Definition Microscope.
  
  
  RESULTS
  With proper polymer/monomer ratio increasing, the occurrence of porosity tended to decrease. The final microstructure of denture varied with PSD of PMMA beads.
  
  
  CONCLUSIONS
  By means of optimizing PSD of beads, the microstructure of denture could be improved, and the occurrence of porosity could be reduced.
authors.affiliation: Dental Materials Laboratory, Peking University School of Stomatology, Beijing 100081, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.forename: Tong
authors.initials: T
authors.lastname: Wang
authors.forename: Heng-chang
authors.initials: HC
authors.lastname: Xu
mesh_terms: D003764:Dental Materials / Q000737:chemistry; D003778:Dentures; D010316:Particle Size; D019904:Polymethyl Methacrylate / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D019904:Polymethyl Methacrylate