[The effect of different dispersive methods on flexural strength nano-ZrO(2) reinforced denture polymethyl methacrylate].
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.
Zhang
Xiu-yin
XY
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
Wu
Wei-li
WL
Bian
Yi-ming
YM
Zhu
Bang-shang
BS
Yu
Wei-Qiang
WQ
D003764:Dental Materials; D003819:Denture Bases; D003778:Dentures; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D018583:Pliability; D019904:Polymethyl Methacrylate
D003764:Dental Materials; D008689:Methacrylates; D019904:Polymethyl Methacrylate