The relationships between baking temperature of self-developed prosthodontia investment and expansion rate

expansion coefficient as well as and solidifying time

tensile strength were investigated

and the interface reaction of investment material with pure Ti at ambient temperature one-cladding was observed.The result shows that the investment materials can completely meet the requirement of actual false teeth manufacturing due to its maximum solidifying expansion rate of 0.1% and thermal expansion rate of 0.46[WTXT]% at 800 ℃ as well as totally expansion rate of 0.56%.Tensile strength of baked materials is in the range of 0.3～0.35 MPa

and the tensile strength of the materials is 2.35 MPa after solidified for 24 hours

which can meet the demand of casting process.Zr and P can be ignored due to its little diffusion in pure Ti.The castings quality can be controlled by surface treatment for Mg spreading depth of 6 μm

Al of 20μm and Si of 15 μm in the cast Ti system.