结合强度论文：纯钛表面不同化学处理影响钛—瓷结合强度的研究.docVIP

结合强度论文：纯钛表面不同化学处理影响钛—瓷结合强度的研究 【中文摘要】通过在纯钛表面应用不同化学溶液处理进行表面改性，探讨其能否改变钛-瓷之间结合强度，为临床工作提供理论及实验依据。材料和方法制备25mm×3mm×0.5mm的纯钛试件30个，随机分为3组，分别为对照组、酸处理组（HNO3组）及碱处理组（NaOH组）。以对照组作为参照，另两组纯钛试件分别采用以下处理：HNO3组：将试件浸泡于35%HNO3-5%HF溶液中1min；NaOH组，将试件浸泡于105℃50% NaOH-10% CuSO4·5H2O溶液中10min，所有试件超声清洗后均以110μm的Al2O3颗粒统一进行喷砂，喷砂角度为45°，距离10mm，喷砂压力为2bar，喷砂时间5s。之后在所有试件的中央部分进行堆瓷，瓷层的尺寸按ISO 9693标准统一控制在长8mm，宽3mm，厚1mm。每组随机抽取一个试件以树脂包埋后横断剖开，打磨，抛光，用电子显微镜观察钛-瓷试件结合界面的微观结构。剩余试件在电子万能测试机上测其结合强度的变化，统计测试结果并对其力学测试后钛表面瓷剥脱区进行电子显微镜观察，确定不同化学溶液对钛-瓷结合强度的影响。结果对照组、HNO3组、NaOH组所测得的结合强度分别为（25.10±3.62）MPa，（35.25±4.89）MPa，（37.84±3.71）MPa。NaOH组、HNO3组与对照组相比较，均可以提高钛-瓷之间结合强度（P＜0.5）；而NaOH组与HNO3组比较，两者之间无明显差异（P＞0.5）。电子显微镜观察钛-结合界面可见HNO3组与对照组相比，结合界面镶嵌紧密，边界粗糙；NaOH组可见金属与瓷层中间有过度层，与两者紧密结合；显微图片可见HNO3组、NaOH组钛表面均有较多瓷残留，提示HNO3组、NaOH组同时存在着粘结性失败和内聚性失败，对照组则主要为粘结性失败。结论纯钛表面应用碱性溶液50%NaOH-10%CuSO4·5H2O或者酸溶液35%HNO3-5%HF处理均可以显著提高钛-瓷之间的结合强度，可以达到临床应用的强度。 【英文摘要】The purpose of this study was to investigate the effect of different chemicalprocessing on titanium to enable titanium-porcelain bonding between a low-fusingporcelain and pure titanium.To provide the theoretical basis and experimental basisfor clinical.Material and methods30 specimen of pure titanium in dimensions of 25mm×3mm×0.5mm were madeand divided into three groups（n=10） which were subjected to surface treatment byimmersion in one of the follow solutions―control group：treated according to themanufacturer’s instructions；group HNO3: immersion in 35% HNO3–5% HF aqueoussolution at room temperature for 1 min; group NaOH: immersion in 50% NaOH–10%CuSO4·5H2O aqueous solution at 105 C for 10 min. All specimen were treated withalumina 110μmAl2O3 particles followed by ultrasonic cleaning. Low fusionporcelain（Vita Titankeramik） was applied to the center of one of the sides of each Ti samplewith dimensions of 8mm×3mm×1mm.Scanning electron microscopy （SEM） photomicrographs were taken to characterizethe interface of the titanium–porcelain specimen in each group. ALL the otherspecimen were submitted to a three