Published online Oct 28, 2015.
https://doi.org/10.4047/jkap.2015.53.4.318
Evaluation of shear-bond strength between different self-adhesive resin cements with phosphate monomer and zirconia ceramic before and after thermocycling
Abstract
Purpose
This study compared shear bond strengths of five self-adhesive cements with phosphate monomer to zirconium oxide ceramic with and without airborn particle abrasion.
Materials and methods
One hundred zirconia samples were air-abraded (50 µm Al2O3). One hundred composite resin cylinders were fabricated. Composite cylinders were bonded to the zirconia samples with either Permacem 2.0 (P), Clearfil™ SA Luting (C), Multilink® Speed (M), RelyX™ U200 Automix (R), G-Cem LinkAce™ (G). All bonded specimens were stored in distilled water (37℃) for 24 h and half of them were additionally aged by thermocycling (5℃, 55℃, 5,000 times). The bonded specimens were loaded in shear force until fracture (1 mm/min) by using Universal Testing Machine (Model 4201, Instron Co, Canton, MA, USA). The failure sites were inspected under field-emission scanning electron microscopy. The data was analyzed with ANOVA, Tukey HSD post-hoc test and paired samples t-test (α=.05).
Results
Before and after thermocycling, Multilink® Speed (M) revealed higher shear-bond strength than the other cements. G-Cem LinkAce™ (G) showed significantly lower bond strengths after thermocycling than before treatment (P<.05), but the other groups were not significantly different (P>.05).
Conclusion
Most self-adhesive cements with phosphate monomer showed high shear bond strength with zirconia ceramic and weren't influenced by thermocycling, so they seem to valuable to zirconia ceramic bonding.
Fig. 1
Zirconia specimen.
Fig. 2
Composite resin cylinder.
Fig. 3
Mean shear bond strength (*: Statistically significant with P<.05).
Fig. 4
Failure mode before and after thermocycling (-1 : before thermocycling, -2 : after thermocycling).
Fig. 5
Scanning electron microscope image of zirconia surface (×5,000 magnification). (A) polished with 1 µm diamond paste, (B) sandblasting with 50 µm Al2O3.
Fig. 6
Scanning electron microscope image of zirconia surface after shear-bond strength test (×2,000 magnification, -1: before thermocycling, -2: after thermocycling). (A) P: Permacem 2.0, (B) C: Clearfil™SA Luting, (C) M: Multilink® Speed, (D) R: RelyX™U200, (E) G: G-Cem LinkAce™
Table 1
Self-adhesive resin cements used in this study
Table 2
Mean shear bond strength (MPa) with SD
Table 3
The results of Tukey HSD post hoc test (before thermocycling)
Table 4
The results of Tukey HSD post hoc test (after thermocycling)
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