Abstract:

BACKGROUND: Due to the high cost of precious metals and biological safety of nickel-chromium alloy, titanium porcelain crown attracts attention. However, high production costs and weak bonding strength of titanium limit the use of titanium porcelain. This study aims to produce domestic titanium porcelain powder, reduce the cost of titanium porcelain, replace nickel-chromium alloy porcelain repair, and improve security of fixed dental prosthetics.
OBJECTIVE: To develop a kind of new titanium-bonding-porcelain powder and to test its thermal property.
METHODS: According to the basic requirement of titanium bonding porcelain, based on the expansion coefficient, viscosity, mechanical property and chemical stability of bonding porcelain, as well as influence of bonding porcelain on the wet ability of titanium, the major components of the titanium-bonding-porcelain were selected. The GGW experimental titanium-bonding-porcelain was made after repeated tests. The GGW titanium-bonding-porcelain was analyzed using differential scanning calorimetry and thermal expansion coefficients were determined, the glass transition temperature of GGW bonding-porcelain was also defined, as well as the matching correlation with casting titanium thermodynamics.
RESULTS AND CONCLUSION: Differential scanning calorimetry showed that when GGW bonding-porcelain was about 650 ℃, crystal began to educe from the amorphous matrix, indicating the tentative sintering temperature of GGW titanium-bonding-porcelain was lower than 800 ℃. Under 537 ℃ glass transition temperature, the coefficients of thermal expansion of pure Ti and GWW experimental titanium-bonding-porcelain were 8.42×10-6/℃, 8.29×10-6/℃ respectively. A difference of 0.13×10-6/℃ suggested GWW experimental titanium-bonding-porcelain has an ideal thermal compatibility with casted pure Ti. GGW bonding-porcelain has a promising future for titanium.