[The influence of different opaque thickness on the bond strength of porcelain-fused-to metal restoration].
OBJECTIVE
To study the influence of different opaque thickness on the bond strength of porcelain-fused-to metal (PFM) restorations.


METHODS
The testing sheets were made as the samples of ISO9693. With different sintering temperature and different opaque thickness on the bond strength of PFM restorations, the primary pressure of porcelain crack was measured by using three-points-bending test. Statistical analysis was carried out using a SPSS 10.0 software package. A post hoc multiple comparison test (Student-Newman-Keuls) was performed to evaluate the differences between the individual groups.


RESULTS
In low sintering temperature group, the thin layer of opaque significantly improved the bond strength compared with thick layer of opaque (P<0.05). In high sintering temperature group, the thickness of opaque has no significant influence on the PFM bonding strength. Using the opaque, the bonding strength was better than those without opaque.


CONCLUSIONS
The thickness of opaque has a little influence on the PFM bonding strength.
Xu
Kan
K
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. xukan66@hotmail.com
He
Fan
F
Geng
Yi
Y
D003776:Dental Porcelain; D008422:Materials Testing; D008670:Metals
D008670:Metals; D003776:Dental Porcelain