不同温度热处理后TiO2-SiO2-SnOx纳米薄膜对钛-瓷结合强度的影响

Effect of TiO2-SiO2-SnOx film with different firing temperatures on bond strength of low-fusing dental porcelain to pure titanium

目的 观察不同温度热处理后TiO2-SiO2-SnOx纳米薄膜对钛-瓷结合强度的影响,为修复体临床制作工艺提供参考.方法 采用溶胶-凝胶技术,在铸造纯钛试件表面涂覆TiO2-SiO2-SnOx纳米溶胶液,进行300℃（A组）或750 c℃（B组）热处理,对照组纯钛试件（C组）未行任何表面处理.测试3组表面粗糙度和接触角（每组9个试件）;X射线衍射（X-ray diffraction,XRD）分析薄膜晶相结构;扫描电镜观察薄膜形貌.烧结钛瓷粉后测试3组钛-瓷结合强度（每组9个试件）,扫描电镜观察钛-瓷界面.结果 XRD示A、B组钛试件表面均无金红石相TiO2存在;A、B、C组表面粗糙度分别为（0.97±0.06）、（0.99±0.03）和（0.96±0.07） μm,总体差异无统计学意义（P＞0.05）;A、B组表面接触角（分别为52.04°±3.15°和85.27°±4.17°）与C组（64.37°±3.01°）差异均有统计学意义（P＜0.05）;A组钛-瓷结合强度[（35.66±2.65） MPa]显著高于B组和C组[分别为（26.18±2.22）和（31.66±3.52） MPa] （P＜0.05）.扫描电镜示A组纳米薄膜较致密,存在少量细小裂缝,而B组纳米薄膜则相对松散无序.结论 经300℃热处理后TiO2-SiO2-SnOx纳米薄膜可明显改善钛-瓷结合强度.

Objective To evaluate the influence of TiO2-SiO2-SnOx nano-coatings with different firing temperatures on the bond strength of low-fusing dental porcelain to pure titanium.Methods The surface of pure titanium was coated uniformly with TiO2-SiO2-SnOx nano-coatings by solution-gelatin（Sol-Gel） technology and then fired at 300 ℃（group A） or 750 ℃（group B） for 1 h.The specimens without any coatings were the control group（group C）.There were 10 specimens in each group.Dental porcelain was sintered on the surface of titanium specimens.Surface roughness and contact angle of the coatings were also detected.The titanium-porcelain bond strength was investigated according to YY 0621-2008 standards using three-point flexure bond test.The phase composition of the TiO2-SiO2-SnOx nano-coatings was characterized by X-ray diffraction（XRD）.The interface of titanium-porcelain and TiO2-SiO2-SnOx nano-coatings were observed using scanning electron microscope（SEM）.Results No rutile phase was found in these specimens of group A and group B.The surface roughness of group A,B,C was （0.97±0.06）,（0.99 ±0.03）,（0.96± 0.07） μm,respectively.No significant difference was found among the three groups.Compared with that of group C（64.37°±3.01°）,contact angles detected in group A（52.04°±3.15°） and group B（85.27°±4.17°） were significantly different（P〈0.05）.The bond strength of titanium-porcelain in group A[（35.66±2.65） MPa] was significantly increased compared with those in group B[（26.18 ±2.22） MPa] and group C[（31.66 ±3.52） MPa].SEM photomicrographs of titanium-porcelain interface morphology of the specimens before porcelain sintering showed that TiO2-SiO2-SnOx nano-coatings in group A were compact and homogeneous with petty cracks and those in group B was loose and arranged disorderly.Conclusions TiO2-SiO2-SnOx nano-coating fired at 300 ℃ is significantly effective in improving the titanium-porcelain bond strength.