[The effect of ion-exchange technique on surface strengthening of dental ceramics].
OBJECTIVE
Observe the effect of the ion-exchange technique on the surface strengthening of the dental ceramics.


METHODS
Prepare the standard samples of Vita VMK 95, Vita VMK68 and Shofu Vintage ceramics, 10 pieces for each ceramic. The samples were divided into experiment group and control group. The samples in the experiment group were spread with HX-I ion-exchange cataplasm, and strengthened at the same condition with the control group. Flexure strength and EMPA were tested. All the data were calculated with SPSS 10.0 Stat. Software.


RESULTS
The flexure strength of the experiment group was higher than the control group(P<0.05). EMPA showed that the depth of Na(+)-->K(+) ion-exchange was more than 100microm.


CONCLUSIONS
HX-I ion-exchange cataplasm can significantly improve the flexure strength of dental ceramics and get an evident Na(+)-->K(+) ion-exchange.
Yu
Hai-yang
HY
Huaxi School of Stomatology, Sichuan University, Chengdu 610041, Sichuan province, China. yhying@mail.sc.cninfo.net
He
Li-hong
LH
Zhu
Zhi-ming
ZM
Chao
Yong-lie
YL
Li
Yan-hong
YH