热酸蚀对氧化锆基底与饰瓷剪切强度的影响

Effect of thermal etching on the shear strength of zirconia substrate and decorative porcelain

目的对比分析热酸蚀对氧化锆基底与饰瓷剪切强度的影响。方法以氧化锆陶瓷为基底材料,共制备20个试件,随机分为观察组和对照组,各包括10个试件。对照组接受表面喷砂处理,观察组接受表面喷砂+热酸蚀处理。采用扫描电子显微镜(scanning electron microscope,SEM)和X射线衍射分析(phase analysis of x-ray diffraction,XRD)观察各组表面特征;采用材料试验机测试剪切强度;采用SEM进一步观察各组破坏面特征。结果SEM观察,两组均可见“山峰状”结构,其间观察组为较深裂隙,对照组为细小裂隙。XRD观察到两组衍射峰相似,均以T(101)峰为主峰,且均出现M(111)峰,两组均出现单斜向氧化锆晶体,单斜向氧化锆相对含量观察组为15.16%,对照组为16.22%。观察组剪切强度(24.74±3.02)MPa,高于对照组(21.09±2.58)MPa,差异有统计学意义(t=2.599,P=0.021)。对照组破坏面低倍下可见氧化锆表面饰瓷残留较少,氧化锆基底裸露明显,高倍下可见氧化锆表面呈均匀斜嵴样,饰瓷散在分布。观察组破坏面低倍下可见氧化锆表面仍大面积残留薄层饰瓷,高倍下可见大部分为薄层饰瓷。结论热酸蚀结合喷砂处理有助于提高氧化锆基底与饰瓷的剪切强度。

Objective To compare and analyze the effects of thermal etching on the shear strength of zirconia substrates and decorative ceramics.Methods A total of 20 specimens made with zirconia ceramics were randomly divided into an observation group and a control group with 10 cases in each group.The control group was treated with sandblasting,while the observation group was treated with sandblasting and thermal etching.The surface characteristics were examined by scanning electron microscope(SEM)and phase analysis of X-ray diffraction(XRD),and the shear strength was tested using a universal testing machine.The characteristics of surface destruction were examined by SEM.Results SEM showed that the peak structure was observed in both groups.The observation group exhibited deep fissures,and the control group exhibited small fissures.The diffraction peaks of the two groups are similar.The T(101)peak is the main peak,and both groups exhibit an M(111)peak.However,the peak intensity is relatively small.The relative levels of monoclinic zirconia were 15.16%in the observation group and 16.22%in the control group.The shear bond strength of the observation group was 24.74±3.02 MPa,which was significantly higher than that of the control group at 21.09±2.58 MPa.The difference was statistically significant(t=2.599,P=0.021).In the control group,the porcelain residue on the zirconia surface was minimal at low magnification,and the zirconia substrate was obviously exposed.The zirconia surface was similar to cristae obliqua at high magnification,and the porcelain exhibited a scattered distribution.In the observation group,a large amount of residual veneer porcelain remained on the zirconia surface at low magnification,but considerable porcelain was observed at high magnification.Conclusion Thermal etching and sandblasting treatment can improve the shear strength of zirconia substrate.