The bonding effectiveness of five luting resin cements to the IPS Empress 2 all ceramic system.
BACKGROUND
Variolink II is the only resin cement used for bonding IPS (Ivoclar Porcelain System) Empress 2 ceramic restorations. Alternative luting resin cements need to be investigated for their bonding effectiveness with the IPS Empress 2 ceramic.


OBJECTIVE
To determine the shear bond strength (SBS) and the effect of thermocycling, on the bonding effectiveness, of five resin cements to IPS Empress 2 ceramic.


METHODS
The projecting surfaces of one hundred ceramic discs were ground wet on silicone carbide paper. The specimens were divided into 5 groups of 20. The resin cements were bonded to the prepared ceramic surfaces, in the form of a stub. The specimens were stored under distilled water at 37 degrees C in an oven for 24 hours. Ten specimens in each group were thermocycled for 300 cycles between 5 degrees C and 55 degrees C. All the specimens were stressed to failure in an Instron Materials Testing Machine.


RESULTS
The results were subjected to a one-way analysis of variance (ANOVA). Statistically similar mean SBS values were grouped using the Bonferroni (Dunn) multiple comparison test. The means for the non-thermocycled group were: 26.21, 19.41, 17.69, 17.43, and 15.76. The means for the thermocycled group were: 22.90, 15.72, 14.34, 13.96 and 13.45. The differences between the means were highly significant (p < 0.0125).


CONCLUSIONS
The shear bond strength of Variolink II and Rely XARC to IPS Empress 2 ceramic was effective. Thermocycling had a significant effect on the mean SBS values of Calibra. Thermocycling had no significant effect on the mean SBS values of the other resin cements.
Bookhan
V
V
Department of Restorative Dentistry, School of Dentistry, University of Pretoria, Gauteng, South Africa. definitesol@hotmail.com
Essop
A R M
AR
Du Preez
I C
IC
D000538:Aluminum Silicates / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006358:Hot Temperature; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength
D000538:Aluminum Silicates; C433205:Calibra; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; C075815:IPS-Empress ceramic; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C084550:Vitremer; D003776:Dental Porcelain; C103502:Variolink; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate