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Dental General 95d96831

Which of the following investment material can be heated up to 1200 degrees centigrade?

A
Gypsum bonded
B
Phosphate bonded
C
Silica bonded
D
All of the above
High-Yield Explanation
When the ethyl silicate–bonded investment is heated to a sufficiently high temperature, some silica converts to quartz and provides added expansion. This type of investment can be heated to between 1090 °C and 1180 °C and is compatible with the higher-fusing alloys.  Note- Phosphate bonded investment is heated upto 1050 °C. Closest answer is silica bonded investment materials. Phillip's Dental Materials ed 12 pg 226

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