[Microleakage of various cementing agents for casting ceramics].
OBJECTIVE
To observe and compare the microleakage of different composite resin cement systems for IPS Empress 2 ceramics base.


METHODS
Sixteen healthy non-carious human molars were selected in the study. Class V ceramic inlay was prepared by IPS Empress 2 ceramics. The samples were divided into two groups, eight in each group. RelyX Unicem and Variolink 2 were used for bonding respectively in 2 groups. All specimens were stored in water at 37 degrees centigrade for 24 hours, then the specimens were subjected to 500 thermocycles ranging from 5 degrees centigrade to 55 degrees centigrade. Eight specimens in each group were evaluated by dye penetration. The microleakage was examined with light microscope. Statistical analysis was performed with SPSS11.0 software package.


RESULTS
Enamel margins exhibited lower leakage than dentin margins by using two cementing agents for casting ceramics (P<0.05). The depth of dye for Variolink 2 and RelyX Unicem at enamel and dentin was not significantly different (P>0.05).


CONCLUSIONS
The microleakage of Variolink 2 and RelyX Unicem for IPS Empress 2 ceramics base has similar sealing abilities.
Weng
Wei-min
WM
Department of Prosthodontic, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China. wengweimin31@126.com
Zhang
Xiu-yin
XY
Zhang
Fu-qiang
FQ
D002516:Ceramics; D003738:Dental Cements; D003743:Dental Enamel; D003763:Dental Leakage; D003776:Dental Porcelain; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D007284:Inlays; D019279:Resin Cements
D003738:Dental Cements; D005899:Glass Ionomer Cements; D019279:Resin Cements; D003776:Dental Porcelain; C103502:Variolink