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目的比较不同基底材料与饰面瓷的结合力,为修复临床选择不同的瓷修复体提出依据。方法 2009年11月至2010年5月在大连市口腔医院应用特制模具制作基底材料标本蜡型(直径6mm,高8mm)共60个。根据各基底材料制作要求分别制作镍铬(Ni-Cr)合金、钴铬(Co-Cr)合金、金钯(Au-Pd)合金、混合Au-Pd合金、压铸瓷及氧化锆基底材料标本(每组10个)。在实验标本的一端堆瓷,瓷层总厚度控制在(2.0±0.01)mm。在万能试验机上以0.5mm/min的加载速度进行加载至剪切断裂。对实验标本的剪切强度进行单因素方差分析。结果 6种瓷修复体的的剪切强度为:Au-Pd合金组(51.56±8.93)MPa,Ni-Cr合金组(45.61±3.11)MPa,Co-Cr合金组(37.12±4.08)MPa,混合金钯合金组(36.07±5.42)MPa,氧化锆组(31.52±7.45)MPa,压铸瓷组(29.62±9.97)MPa。单因素方差分析表明不同金属合金基底材料与饰面瓷间的剪切强度差异有统计学意义(P<0.01)。结论不同基底材料与饰面瓷的剪切强度存在差异。Au-Pd合金和Ni-Cr合金与饰面瓷结合力强。
Objective To compare the binding force between different base materials and veneer porcelain and to provide the basis for repairing different porcelain prostheses. Methods From November 2009 to May 2010, a total of 60 wax samples (6mm in diameter and 8mm in height) were made from special molds in Dalian Dental Hospital. According to the requirements of each substrate material, samples of Ni-Cr alloy, Co-Cr alloy, Au-Pd alloy, mixed Au-Pd alloy, die-cast porcelain and zirconia base material 10 per group). Porcelain was stacked on one end of the experimental specimen, and the total thickness of the porcelain was controlled at (2.0 ± 0.01) mm. Load was applied to the shear fracture on a universal testing machine at a loading speed of 0.5 mm / min. One-way ANOVA was performed on the shear strength of experimental specimens. Results The shear strengths of the six kinds of porcelain restorations were 51.56 ± 8.93 MPa for Au-Pd alloy, 45.61 ± 3.11 MPa for Ni-Cr alloy and 37.12 ± 4.08 MPa for Co-Cr alloy, (36.07 ± 5.42) MPa, zirconium oxide (31.52 ± 7.45) MPa and die casting porcelain (29.62 ± 9.97) MPa respectively. One-way ANOVA showed that there was a significant difference in shear strength between different metal alloy substrates and veneer porcelain (P <0.01). Conclusion There is difference between the shear strength of different base materials and veneer porcelain. Au-Pd alloy and Ni-Cr alloy and veneer porcelain strong binding.