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目的 :探讨采用溶胶-凝胶技术在氧化锆表面制备薄纳米SiO_2涂层对氧化锆基底与饰面瓷结合强度的影响,指导氧化锆全瓷冠的制作。方法:将软质氧化锆试件切割成15 mm×10 mm×2.5 mm大小的长方形瓷块40片,分为4组,每组10件,分别采用4种处理方式。A组—仅经1450℃结晶处理;B组—先经30%纳米SiO_2溶胶渗透后,再经1450℃结晶处理;C组—先经1450℃结晶,然后用30%纳米SiO_2溶胶渗透,再经1450℃热处理;D组—表面涂布纳米SiO_2溶胶后,1450℃结晶处理;E组—镍铬合金烤瓷组,使用失蜡铸造法制作12 mm×8 mm×2 mm长方形镍铬合金条块10件。5组试件在其表面堆塑直径为5 mm、高4 mm的饰面瓷圆柱,然后进行剪切强度测试。采用SPSS 19.0软件包对数据进行统计学分析。结果:5组试件的剪切强度分别为A组(28.12±2.95)MPa、B组(31.09±3.94)MPa、C组(25.60±2.45)MPa、D组(31.75±4.90)MPa、E组(28.67±3.95)MPa。单因素方差分析显示5组间具有显著差异(P<0.05),其中,C组与B组和D组均具有显著差异。结论 :1溶胶-凝胶技术在结晶致密前氧化锆基底表面制备纳米SiO_2涂层,能提高氧化锆基底与饰面瓷的结合强度;2在结晶致密的氧化锆基底表面制备纳米SiO_2涂层,能降低氧化锆基底与饰面瓷的结合强度;3氧化锆与氧化锆专用饰面瓷的结合强度与常用金属与饰面瓷的结合强度一致;4通过溶胶-凝胶技术在结晶致密前的氧化锆基底表面导入SiO_2溶胶,提高氧化锆与饰面瓷结合强度的技术路线切实可行。
OBJECTIVE: To investigate the effect of sol-gel technique on the bonding strength between zirconia substrate and veneering porcelain prepared by thin nano-SiO 2 coating on the surface of zirconia, and to guide the fabrication of zirconia all-ceramic crowns. Methods: The soft zirconia specimen was cut into 40 pieces of rectangular porcelain with a size of 15 mm × 10 mm × 2.5 mm. The soft porcelain was divided into 4 groups with 10 pieces in each group, and 4 kinds of treatments were used respectively. Group A - crystallized only at 1450 ° C; Group B - first infiltrated with 30% nano-SiO 2 sol and then crystallized at 1450 ° C; Group C - crystallized at 1450 ° C and then infiltrated with 30% nano- 1450 ℃ heat treatment; Group D - surface coated with nano-SiO_2 sol and then crystallized at 1450 ℃; Group E - Ni-Cr alloy porcelain group, a 12 mm × 8 mm × 2 mm rectangular Ni-Cr alloy ingot 10. Five specimens were stacked on the surface with 5 mm diameter and 4 mm high porcelain veneer and then tested for shear strength. Data were statistically analyzed using SPSS 19.0 software package. Results: The shear strength of the five specimens were 28.12 ± 2.95 MPa in group A, 31.09 ± 3.94 MPa in group B, 25.60 ± 2.45 MPa in group C and 31.75 ± 4.90 MPa in group D, respectively (28.67 ± 3.95) MPa. One-way analysis of variance showed significant differences between the 5 groups (P <0.05), of which C group was significantly different from B group and D group. Conclusions: 1 Sol-gel technology can prepare nano-SiO 2 coating on zirconia substrate before densification, which can improve the bonding strength between zirconia substrate and veneer porcelain.2 Preparation of nano-SiO 2 coating on the surface of dense zirconia substrate, Can reduce the bonding strength of zirconia substrate and veneer porcelain; 3 zirconia and zirconia special veneer porcelain bonding strength and commonly used metal and veneer porcelain bonding strength; 4 by sol-gel technology in the crystal before dense Zirconia substrate surface into the SiO 2 sol, zirconia and porcelain to improve the bonding strength of the technical line feasible.