The purpose of this study was to investigate the effect of preoxidation on porcelain titanium- bond strength and the effect of paste bonder (adhesive) on the titanium porcelain bond strength. 11 specimens of commercially pure titanium (26 x 7 x 3 mm) were prepared by different heat treatments in programmable dental furnace. Identification of the oxides formed on the metal surface was conducted with an X-Ray diffractometer with CuKalpha radiation. Vickers hardness numbers were determine. Additional 50 specimens of commercially pure titanium were used to bond with low fusing porcelain. The bond strength was measured in a universal testing machine. X-ray diffraction analysis of the surface of pure titanium revealed that the relative peak intensity of alpha -Ti decreased and that of TiO2 increased with increasing firing temperature. The Vickers hardness number decreased initially as the temperature increased but it increased remarkably above 900 degrees C & was harder in air than vacuum. The tensile shear bond strength was highest in the green stage i.e. without preoxidation of metal, and decreased above 900 degrees C, and was the lowest in the group without paste bonder application. The difference in bond strengths was statistically highly significant for all groups. Preoxidation under vacuum before porcelain firing can effectively improve bonding. The adhesive provided with the low fusing porcelain helps in the bond between titanium & porcelain.
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机译：这项研究的目的是研究预氧化对瓷器钛结合强度的影响以及糊剂（胶粘剂）对钛瓷结合强度的影响。通过在可编程牙科炉中进行不同的热处理，制备了11个商业纯钛（26 x 7 x 3 mm）样品。用X射线衍射仪在CuKalpha辐射下对金属表面形成的氧化物进行鉴定。确定维氏硬度值。使用另外的50个商业纯钛标本与低熔瓷结合。粘结强度在通用测试机中测量。对纯钛表面的X射线衍射分析表明，随着焙烧温度的升高，α-Ti的相对峰强度降低，而TiO2的相对峰强度升高。维氏硬度值最初随温度升高而降低，但在900摄氏度以上显着增加，并且在空气中比真空更硬。拉伸剪切粘合强度在生坯阶段即没有金属的预氧化时最高，而在900℃以上时降低，并且在没有施加糊剂的组中最低。在所有组中，粘合强度的差异在统计学上高度显着。烤瓷前在真空下进行预氧化可有效改善粘结性。低熔点瓷器提供的粘合剂有助于钛和瓷器之间的粘合。
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