Bond strength of porcelain on cast vs. wrought titanium.
The bond strength of porcelain fused to cast and wrought titanium surfaces was calculated from fracture loads in a 4-point bending test. Two different porcelain were applied (O'Hara and Duceratin). The surface of Ti-cast specimens was treated in two different ways to produce variations in the impurity level before porcelain veneering. Microhardness measurements as well as scanning electron microscopy with EDX analysis were conducted. The results showed no significant difference in bond strength between the two porcelains. Nor was any difference in bond capacity found between thoroughly blasted castings and wrought titanium. Significantly lower bond strengths were observed for lightly blasted specimens and for specimens treated with Gold bonding agent. Impurities in the surface region of the castings were found to be due to contact with the investment during solidification. This indicates that a thin surface layer (50-100 microns) of the casting should be removed before firing of the porcelain.
Dérand
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Department of Oral Technology, Lund Centre for Oral Health Sciences, Malmö, Sweden.
Herø
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D000537:Aluminum Oxide / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D017554:Carbon Compounds, Inorganic; D001840:Dental Bonding; D003734:Dental Casting Investment / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D004577:Electron Probe Microanalysis; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D017655:Silicon Compounds; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
D017554:Carbon Compounds, Inorganic; D003734:Dental Casting Investment; D010087:Oxides; D017655:Silicon Compounds; D003776:Dental Porcelain; D002244:Carbon; D014025:Titanium; D000537:Aluminum Oxide; C022088:silicon carbide; D012825:Silicon