An in vitro comparison of the influence of different surface treatment on shear bond strength between zirconia and enamel

Abstract

Abstract: PURPOSE: To compare the shear bond strength of zirconia to enamel using different surface treatments, in order to provide evidence for clinical practice. METHODS: Forty cut and fully sintered Lava frame zirconia blocks (2.7 mm×2.7 mm×5 mm) were randomly divided into 4 groups and subjected to 4 different surface treatments: no treatment (control), airborne-particle abrasion; airborne-particle abrasion and silane; airborne-particle abrasion and CoJet sand (silica coating with 30 μm silica-modified alumina particles) and silane. After surface treatment, the zirconia blocks were bonded to acid-etched enamel with self-adhesive resin cement (RelyX Unicem). Half of the specimens in each group were stored in 37℃ distilled water for 24 h and the others were thermocycled (5℃ and 55℃) for 5000 cycles. All specimens were subjected to shear bond strength (SBS) test. The data was analyzed with SPSS 20.0 software package for two-way ANOVA and t test. Failure mode was observed and analyzed by scanning electron microscope (SEM). RESULTS: Airborne-particle abrasion and CoJet Sand and silane group resulted in a significantly higher SBS than those in other groups (P<0.001), while no significant difference existed between the specimens which were submerged in 37℃ water stored and thermocycled (P=0.595) within this group. No adhesive failures were observed by SEM in this group. CONCLUSIONS: The combination of tribochemical silica coating with silane coupling can improve the bond of zirconia when self-adhesive resin cement is used and it is recommended as a pre-treatment to increase zirconia retention.

Key words: Zirconia, Shear bond strength, CoJet, Silane

CLC Number:

R783.3

CHENG Hong, QIAO Guang-yan, DONG Cong, ZHANG Fu-qiang. An in vitro comparison of the influence of different surface treatment on shear bond strength between zirconia and enamel[J]. Shanghai Journal of Stomatology, 2014, 23(4): 436-440.

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