Mahale K M, Nagda S J
Eur J Prosthodont Restor Dent. 2014 Jun;22(2):76-83.
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.
本研究的目的是调查预氧化对瓷与钛结合强度的影响以及糊剂粘结剂（粘合剂）对钛瓷结合强度的影响。通过在可编程牙科熔炉中进行不同的热处理制备了11个商业纯钛样本（26×7×3毫米）。使用带有CuKα辐射的X射线衍射仪对金属表面形成的氧化物进行鉴定。测定维氏硬度值。另外使用50个商业纯钛样本与低熔瓷进行粘结。在万能试验机上测量粘结强度。纯钛表面的X射线衍射分析表明，随着焙烧温度升高，α-Ti的相对峰强度降低，而TiO2的相对峰强度增加。维氏硬度值最初随温度升高而降低，但在900℃以上显著增加，且在空气中比在真空中更硬。拉伸剪切粘结强度在生坯阶段最高，即金属未预氧化时，在900℃以上降低，且在未使用糊剂粘结剂的组中最低。所有组的粘结强度差异具有高度统计学意义。在瓷焙烧前在真空中进行预氧化可有效改善粘结。低熔瓷所配备的粘合剂有助于钛与瓷之间的粘结。
