Abstract
This study compared shear bond strength (SBS) of six self-adhesive resin cements (SARC) and one resin-modified glass ionomer cement (RMGIC) to zirconia before and after thermocycling. The cylinder shape (Φ 2.35 mm × 3 mm) of six SARCs (G-CEM LinkAce (GLA), Maxcem Elite (MAX), Clearfil SA Luting (CSL), PermaCem 2.0 (PM2), Rely-X U200 (RXU), Smartcem 2 (SC2)) were bonded to the top surface of the zirconia specimens with light-curing. RMGIC (Fujicem (FJC)) was bonded to the specimens with self-curing. The shear bond strength of all cemented specimens was measured with universal testing machine. Half of the specimens were thermocycled 5000 times before shear bonding strength testing. Fractured surfaces were examined with a field-emission SEM (10,000×) and analyzed by energy dispersive x-ray analysis. MAX, PM2, SC2 group without thermocycling and GLA, MAX, PM2 group with thermocycling showed adhesive failure, but GLA, CSL, RXU, FJC group without thermocycling and SLC, RXU, SC2, FJC group with thermocycling indicated cohesive failure. Within the limitation of this study, All of SARCs except MAX demonstrated higher bond strength than that of RMGIC regardless of thermocycling. Also, SARC containing MDP monomers (CSL) retained better bonds than other cements.
Highlights
Adequate adhesion between restorations and teeth is one of the major factors of successful indirect restoration [1]
The greatest bonding strength was manifested in Group Clearfil SA Luting (CSL)
Reduction in bond strength was greater with group G-CEM LinkAce (GLA) (32.8%), followed by Groups PermaCem 2.0 (PM2) (28.6%) and Maxcem Elite (MAX) (27.3%)
Summary
Adequate adhesion between restorations and teeth is one of the major factors of successful indirect restoration [1]. Cements suitable to the restoration type must be selected [2]. An ideal luting cement must provide sustainable bonds with different materials, sufficient compression and tensile strengths, wettability, and resistance to dissolution in the oral cavity [3,4]. There are various types of cement: zinc phosphate cement (ZPC), poly carboxylate cement, glass ionomer cement, resin-modified glass ionomer cement (RMGIC), and resin cement [5]. Resin cement has better compressive and tensile strengths, toughness, resilience, and extremely lower solubility than other luting agents. It is aesthetically excellent and provides several color option [6]
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