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KMID : 1036420150080020082
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대한치의학회 영문학회지
2015 Volume.8 No. 2 p.82 ~ p.88
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Effects of Light-Curing on the Immediate and Delayed Micro-Shear Bond Strength between Yttria-Tetragonal Zirconia Polycrystal Ceramics and Universal Adhesive
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Lee Yoon
Woo Jung-Soo
Eo Soo-Heang
Seo Deog-Gyu
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Abstract
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Purpose: To evaluate the effect of light-curing on the immediate and delayed micro-shear bond strength (μSBS) between yttria-tetragonal zirconia polycrystal (Y-TZP) ceramics and RelyX Ultimate when using Single Bond Universal (SBU).
Materials and Methods: Y-TZP ceramic specimens were ground with #600-grit SiC paper. SBU was applied and RelyX Ultimate was mixed and placed on the Y-TZP surface. The specimens were divided into three groups depending on whether light curing was done after adhesive (SBU) and resin cement application: uncured after adhesive and uncured after resin cement application (UU); uncured after adhesive, but light cured after resin cement (UC); and light cured after adhesive and light cured resin cement (CC). The three groups were further divided depending on the timing of μSBS testing: immediate at 24 hours (UUI, UCI, CCI) and delayed at 4 weeks (UUD, UCD, CCD). μSBS was statistically analyzed using one-way ANOVA and Student-Newman-Keuls multiple comparison test (P<0.05). The surface of the fractured Y-TZP specimens was analyzed under a scanning electron microscope (SEM).
Result: At 24 hours, μSBS of UUI group (8.60±2.06 MPa) was significantly lower than UCI group (25.71±4.48 MPa) and CCI group (29.54±3.62 MPa) (P<0.05). There was not any significant difference between UCI and CCI group (P>0.05). At 4 weeks, μSBS of UUD group (24.43±2.88 MPa) had significantly increased over time compared to UUI group (P<0.05). The SEM results showed mixed failure in UCI and CCI group, while UUI group showed adhesive failure.
Conclusion: Light-curing of universal adhesive before or after application of RelyX Ultimate resin cement significantly improved the immediate μSBS of resin cement to air-abrasion treated Y-TZP surface. After 4 weeks, the delayed μSBS of the non-light curing group significantly improved to the level of light-cured groups.
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KEYWORD
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Delayed micro-shear bond strength, Immediate micro-shear bond strength, Light-curing, Resin cements, Universal adhesive, Yttria-stabilized tetragonal zirconia polycrystals ceramic
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