Shear bond strength of luting agents to fixed prosthodontic restorative core materials.
BACKGROUND
Bonding properties of luting cements are important for retention of restorative core materials. The aim of this study was to compare the bonding performance of a resin-modified glass ionomer cement and a self-adhesive resin cement to various fixed prosthodontic core materials.


METHODS
Cylindrical specimens with a thickness of 2 mm and a diameter of 5 mm were fabricated from Au-Pd-Ag, Co-Cr, Ni-Cr-Mo, Ni-Cr-Fe alloys, titanium, zirconia and Empress II (n = 20). Each group was divided into two subgroups to be luted with two different luting agents. Composite resin blocks were cemented onto specimens with RelyXUnicem and FujiCem. A shear bond strength machine with 50 kg load cell and 0.50 mm/min crosshead speed was used. Kruskal Wallis test, Dunn's Multiple Range test and Mann-Whitney-U test were used for statistical analysis. The results were evaluated in a confidence interval of p < 0.05.


RESULTS
The highest bond strength was obtained between Ni-Cr-Fe-RelyXUnicem (8.22 +/- 2.15 MPa) and the lowest was between Empress II-FujiCem (1.48 +/- 0.9 MPa). In FujiCem groups, Co-Cr and Ni-Cr-Fe showed significantly higher bond strength than Au-Pd-Ag and Empress II. In RelyX Unicem groups, Ni-Cr-Fe showed higher bond strength than Empress II.


CONCLUSIONS
The types of luting agents and restorative core materials may have a significant influence on bond strength.
Capa
N
N
Faculty of Dentistry, Yeditepe University, Istanbul, Turkey. capanuray@yahoo.com
Ozkurt
Z
Z
Canpolat
C
C
Kazazoglu
E
E
D003722:Dental Alloys; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties; D014025:Titanium; D015040:Zirconium
D003722:Dental Alloys; C542393:FujiCEM; D005899:Glass Ionomer Cements; C483701:Rely X Unicem; D019279:Resin Cements; D003776:Dental Porcelain; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide