title: [The effect of different dispersive methods on flexural strength nano-ZrO(2) reinforced denture polymethyl methacrylate].
abstract: OBJECTIVE
  To study the effect of different dispersive methods on flexural strength of nano-ZrO(2)/polymethl methacrylate(PMMA) composite samples.
  
  
  METHODS
  The nanometer ZrO2 particles which were modified by coupling agent Z-6030 were mixed to PMMA as the filler materials (3%) by means of handle disperse, ball milling disperse and ultrasonic wet disperse, respectively. Pure PMMA was used as blank control .With reference to the standard of ISO-1567:1999, standard samples were made and tested by three-point bending test. Then the data of flexural strength of the four groups were analyzed statistically with SAS 6.12 software package for one-way ANOVA(Newman-Keuls test). And the optimized synthesis way of the PMMA composite materials was selected.
  
  
  RESULTS
  The flexural strength of the ball milling group and the ultrasonic group were significantly higher than the handle group and blank group(P<0.05), with an increase of 17%,10% compared with the blank group. There was no significant difference between the ball milling group and the ultrasonic group (P>0.05).
  
  
  CONCLUSIONS
  Dispersal ways have effect on the flexural strength of PMMA composite materials which are filled with ZrO(2) particles.
authors: Department of Prosthodontics, College of Stomatology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China. xyinzhang@yahoo.com.cn
authors: Xiu-yin
authors: XY
authors: Zhang
authors: Wei-li
authors: WL
authors: Wu
authors: Yi-ming
authors: YM
authors: Bian
authors: Bang-shang
authors: BS
authors: Zhu
authors: Wei-Qiang
authors: WQ
authors: Yu
mesh_terms: D003764:Dental Materials; D003819:Denture Bases; D003778:Dentures; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D018583:Pliability; D019904:Polymethyl Methacrylate
chemical_list: D003764:Dental Materials; D008689:Methacrylates; D019904:Polymethyl Methacrylate