The Relevant Research On The Bond Durability Between Self-adhesive Cements And Zirconia Ceramic

Part 1:The effect of air abrasion on the bond durability between self-adhesive resin cements and zirconia ceramicObjectiveTo compare the bond durability of self-adhesive resin cements to zirconia ceramic with and without air abrasion.Methods120 zirconia ceramic plates were cut and sintered,then be polished on wet 240-,400- and 600-grid silicon carbide paper.60 of the specimens were air-abraded with 50μm Al2O3 particles and obtained as the air-abraded specimens.3D-laser scanning microscope was used to image the zirconia ceramic surfaces. Various roughness parameters were calculated by an image processing and analysis software package.Then polished and sandblasted ceramic samples were bonded to composite cylinders with either Biscem (BC)、G-Cem (GC)、RelyX U100(RU)、Multilink Speed (MS)、Maxcem (MC)or SA Luting (SL). The samples then divided into two subgroups, and received shear test after 0 and 10000 time thermal cycles. The bond strength of each group was analyzed through one-way ANOVA followed by comparison of means with SNK’s test were applied in order to compare the bond strength of all the groups (p<0.05).ResultsAnalysis of the zirconia surface showed that air-abrasion could significantly increase the surface roughness comparing with polishing procedure (p<0.05). The cracks and grooves caused by the polishing procedure were effectively removed by air-abrasion.According to ANOVA, the differences among the experimental groups were significant (p<0.05). The bond strengths in all test groups decreased after 10000 thermal cycle(P< 0.001), polished specimens bonded with MS (11.07±2.05MPa) and SL (9.8±1.3MPa) had significantly higher bond strength than those bonded with either BC (6.18±1.46MPa), GC (5.64±1.15MPa), RU (6.29±0.93MPa), or MC (3.31±1.59MPa)(P<0.001).Compare with polishing, air abrasion significantly increased the bond strength of BC(12.05±2.51MPa), GC(10.1±2.39MPa),RU(9.73±1.26MPa),MC(5.03±0.83MPa) and SL(15.22±2.94MPa), whereas the bond strength of MS(11.23±1.25MPa) was not significantly affected. The failure mode of all specimens was adhesive between ceramic and resin cement.ConclusionSignificant differences in the bond durability were found between different self-adhesive resin cements and zirconia ceramic,the bond durability was not influenced by air abrasion completely.Part 2:The effect of light irradiation time on the bond durability between self-adhesive resin cements and zirconia ceramicObjectiveTo evaluate the effect of light irradiation time on the cure potential and bond durability of self-adhesive resin cement to zirconia ceramic.Methods225 zirconia ceramic plates were cut and sintered, then be polished on wet 240-,400-and 600-grid silicon carbide paper.1) All the zirconia ceramic specimens were divided into 3 supergroups (BC, GC and SL). Each supergroup was divided into 3 groups, and polymerized by one of three light-irradiation conditions using the visible-light-curing light.Two subgroups was stored in distilled water at 37℃ for 0.5 or 24 hours. The other subgroup was stored in distilled water at 37℃ for 24 hours and followed by 5,000 thermal cycles.The failure mode of specimens was observed and analyzed by an optical microscope at X 20 magnification.2) The rest zirconia ceramic specimens were divided into 3 supergroups (BC, GC and SL). According to the different irradiation time, each supergroup was divided into 3 groups, and totally 9 groups were obtained.Each of three groups had 5 specimens. All specimens were stored dry in darkness and kept in a incubator at 37℃ for 0.5 or 24h.3) The bond strength of each group was analyzed through one-way ANOVA followed by comparison of means with SNK’s test were applied in order to compare the bond strength of all the groups (p<0.05).Results1) Compared to 0.5h, except of 40s irradiation group of G-Cem and 20s and 40s irradiation groups of SA Luting, the bond strength of other groups increased significantly after 24h。 Except of 40s irradiation group of G-Cem and 20s and 40s irradiation groups of SA Luting, thermocycling reduced the bond strength of other groups. After thermocycling, the bond strength of 20s irradiation group was higher than that of 5s and 40s irradiation groups.2) After stored 24h, to three resin cements, the microhardness of 20s and 40s irradiation groups were higher than that of 5s irradiation group. Only the microhardness of 40s irradiation of Biscem was higher than that of 20s irradiation.ConclusionThe light irradiation time could affect the cure and bond potential of self-adhesive resin cement, and the optimal resin bond effect of zircornia ceramic is not depended simply on the extension of light irradiation.