The Effect Of SnO₂Films Made By Sol-gel Method On Titanium Plastic Bonding Strength Of Pure Titanium

Objectives To explore suitable concentration and temperature of heating treatment aboutcontaining tin film of titanium surface made by the sol-gel method; to detect the bondingstrength of the titanium plastic by shearing strength test, to determine the optimumtemperature of heating treatment and the concentration of the sol film; using the fieldemission scanning electron microscope to observe the surface morphology of coating andusing X-ray diffraction analyzer to analyze films’ chemical composition, to providexperimental basis for clinical application of titanium plastic prosthesis.Methods The preparation of titanium specimens:The eighty titanium specimens werecut (10mm×20mm×2mm) with blasting, ultrasonic cleaned and dryednaturally.Selecting30pure titanium sheet, six in each group,coating0.20mol/L,0.30mol/L,0.37mol/L,0.50mol/L,0.60mol/L of five different concentrations of tin-containing sol, after heating treatment with300℃,500℃,700℃; to determine theconcentration of intact tin oxide films using the field emission scanning electronmicroscope to observe the morphology of plating tin oxide film. Then divide50titaniumspecimens into9experimental groups and1control group, five in each group. Theexperimental specimens were coated with0.3mol/L,0.37mol/L,0.5mol/L sol and300℃,500℃,700℃temperature heating-treatment, then using universal testing machine tomeasure the bonding strength of pure titanium and polymer-ceramic, using X-raydiffraction analyzer to analyze the interface components; using SPSS17.0software tovalue the datas of each group’s shear bond strength, by analysis of variance and SNK test(Student-Newman-Keul, q test).Result1Selection of tin oxide sol concentration:there was almost no film made of0.2mol/L sol on titanium surface. there was large cracks in film made of0.6mol/L sol ontitanium surface. so these two cases were not ideal. The films made of0.3mol/L,0.37mol/L,0.5mol/L sol were intact and uniform, only had minor cracks.2The results ofshear bond strength test: The differences of bonding strength between10experimentalgroups were statistically significant by one-way ANOVA (P<0.05), The bondingstrength of the film made of heat-treated with700℃,0.3mol/L sol was the best than theorther groups by SNK test analysis (P<0.05).3Using a field emission scanning electronmicroscopy to observe the surface morphology of coating. The surface morphology of group A was rugged and rough surface; the surface of group B was relatively smoothsurface, and there were many small cracks; the surface of group C was disorderly cloud-shaped with cracks; the surface of group D was smooth, dense, uniform, and there werefew small cracks.4Using X-ray diffraction analysis to analyze composition of thefilm.SnTi3occured in the film made of300℃; a small amount of SnTi3and SnO2showed in the films made of500℃, a large number of SnTi3and SnO2existed in filmsmade of700℃.Conclusion1The ideal concentration of sol making film was0.3mol/L,0.37mol/L,0.5mol/L.2The bonding strength of the film made of heat-treated with700℃,0.3mol/L sol was the best than the orther groups3The existence form of Sn was SnTi3,SnO2, which was strong chemical binding way.