[The study of compressive strength of phosphate-bonded investment materials].
OBJECTIVE
The purpose of this study was to compare the compressive strength of phosphate-bonded investments.


METHODS
The three sorts of investments were mixed according to manufacturer's recommendation before poured in the molds. After heated up to 900 degrees C, every sample was mounted on a universal experimental machine to test its compressive strength in ambient.


RESULTS
Significant differences were found between the four groups(P < 0.01).


CONCLUSIONS
From the data above it is concluded that the compressive strength of X-20 Chrome Investment mixed with the special liquid was the highest.
D019245:Compressive Strength; D001840:Dental Bonding; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique / Q000295:instrumentation; D008422:Materials Testing; D010710:Phosphates / Q000737:chemistry*
D003734:Dental Casting Investment; D010710:Phosphates