上釉技术对氧化钇稳定四方相氧化锆多晶陶瓷粘接及力学性能的影响

Effect of glaze technology on adhesive and mechanical properties of yttria-stabilized tetragonal zirconia polycrystal ceramics

背景:任何表面处理都应在不损害原有氧化钇稳定四方相氧化锆多晶陶瓷强度的前提下提高其粘接强度。目前缺乏上釉技术对氧化钇稳定四方相氧化锆多晶陶瓷粘接强度影响的资料,并且其对氧化钇稳定四方相氧化锆多晶陶瓷力学性能的影响尚不明确。目的:评估上釉技术对氧化钇稳定四方相氧化锆多晶陶瓷力学行为及其与树脂水门汀粘接强度的影响。方法:制作氧化钇稳定四方相氧化锆多晶陶瓷试件并随机分为4组:A组,表面不做任何处理;B组,110μm氧化铝颗粒喷砂;C组,上釉+氢氟酸酸蚀;D组,上釉+氢氟酸酸蚀+硅烷化。检测每组试件的表面显微形貌、粗糙度、晶相结构、元素组成、剪切粘接强度和弯曲强度,并观察剪切粘接强度测试后所有断面的断裂模式。结果与结论:①经表面处理后的试件粗糙度明显增大,降序排列依次为C组(0.62±0.01)μm、D组(0.55±0.02)μm、B组(0.11±0.02)μm、A组(0.05±0.01)μm,5组间粗糙度比较差异有显著性意义(P<0.05);②B组试件表面含有2.2%单斜相氧化锆,而其他组含量均为零;③除锆和氧2种元素外,B组还含有铝元素6.49%,C和D组分别含有硅元素18.67%和25.78%;④A、B、C、D组的剪切粘接强度分别为(3.11±0.40),(4.23±0.45),(6.62±0.60),(10.46±0.83)MPa,组间两两比较差异均有显著性意义(P<0.05);⑤A、B、C和D组的三点弯曲强度分别为(961.07±75.53),(1234.73±114.09),(1024.28±120.51),(1036.09±80.10)MPa,其中A、C和D组两两比较差异无显著性意义(P>0.05),B组与A、C、D组比较差异有显著性意义(P<0.05);⑥结果表明,上釉技术未明显提升氧化钇稳定四方相氧化锆多晶陶瓷的弯曲强度,但上釉后经氢氟酸蚀刻并硅烷化处理可显著增强氧化钇稳定四方相氧化锆多晶陶瓷与树脂水门汀之间的粘接强度。

BACKGROUND: Any surface treatments should improve the bond strength of yttria-stabilized tetragonal zirconia polycrystal ceramics without damaging the original strength. Currently, there is no information about the influence of glaze technology on the bond strength of yttria-stabilized tetragonal zirconia polycrystal ceramics, and its influence on the material strength is unclear. OBJECTIVE: To evaluate the effect of glaze technology on the mechanical behavior of yttria-stabilized tetragonal zirconia polycrystal ceramics and on the bond strength with resin cements. METHODS: Yttria-stabilized tetragonal zirconia polycrystal ceramics specimens were prepared and randomly divided into four groups: group A: the surface was not treated;group B: sandblasting with 110 μm Al2 O3 particles;group C: glaze + hydrofluoric acid etching;group D: glaze + hydrofluoric acid etching + silanization. The surface morphology, surface roughness, phase transformation, elemental composit ion, shear bond strength and flexural strength of zirconia specimens after surface treatments were tested. RESULTS AND CONCLUSION:(1) The surface roughness of treatment groups increased obviously, whose descending order was group C(0.62±0.01) μm > group D(0.55±0.02) μm > group B(0.11±0.02) μm > group A(0.05±0.01) μm(P < 0.05).(2) The surface of specimens in the group B contained 2.2% monoclinic zirconia, while the content of other groups was zero.(3) In addition to elements of Zr and O, there was 6.49% Al element in the group B specimens, and 18.67% and 25.78% Si element in the groups C and D specimens, respectively.(4) The shear bond strength in the groups A, B, C and D was(3.11±0.40),(4.23±0.45),(6.62± 0.60) and(10.46±0.83) MPa, respectively(P < 0.05).(5) The three-point flexural strength in the groups A, B, C and D was(961.07± 75.53),(1 234.73±114.09),(1 024.28±120.51), and(1 036.09± 80.10) MPa, respectively, among which the multiple comparison of groups A, C and D showed no significant difference(P > 0.05).(6) The effect of glaze technology on improving the flexural strength of yttria-stabilized tetragonal zirconia polycrystal ceramics is not as obvious as that of sandblasting, but the bond strength between tetragonal zirconia polycrystal ceramics and resin cements can be significantly improved with hydrofluoric acid etching and silanization after glaze.