Effect of polymerization mode of a dual-cured resin cement on time-dependent shear bond strength to porcelain.
OBJECTIVE
To evaluate the shear bond strengths to porcelain and setting times of a dual-cured resin cement with light/chemical curing (dual) or chemical only curing versus time.


METHODS
Variolink resin cement was bonded to specimens of etched, silanated porcelain. Groups of specimens were cured by dual cured or by chemical curing only. Shear bond strengths were recorded at 2, 3, 5, 60 minutes and 24 hours for dual cured and at 10, 20, 40, 50, 60 minutes and 24 hours for chemical-cured only after mixing. Kinetic-temperature profiles of dual and chemical curing modes of cement were calculated.


RESULTS
Maximum bond strengths and time to attainment were 17.5 +/- 2.7 MPa at 60 minutes for chemical-cured and 26.1 +/- 2.3 MPa at 5 minutes for dual-cured. The peak in the kinetic-temperature setting profiles were 14.1 +/- 0.9 minutes for chemical curing and 52.2 +/- 5.2 seconds for dual curing. Dual curing provided significantly higher shear bond strengths versus chemical curing at both the 60-minute and 24-hour time periods.
Peters
A D
AD
Dept of Restorative Dentistry & Endodontology, School of Dental Medicine, UCHC, Farmington 06030-1715, USA.
Meiers
J C
JC
D000704:Analysis of Variance; D002858:Chromium Alloys; D001840:Dental Bonding; D003776:Dental Porcelain; D008027:Light; D008422:Materials Testing; D019563:Mechanics; D011108:Polymers / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012821:Silanes; D013997:Time Factors
D002858:Chromium Alloys; D011108:Polymers; D019279:Resin Cements; D012821:Silanes; D003776:Dental Porcelain; C103502:Variolink; C036884:Rexillium III