Which of the following refractory is used to counteract most of the expansion________________?
Correct answer: B. Cristobalite
- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. Corundum
Explanation
Cristobalite undergoes a relatively large thermal expansion, so it is incorporated into investments when greater setting and thermal expansion is needed to compensate for casting shrinkage. Quartz expands less and is therefore the usual distractor.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Dental Ceramics
34 free Dental Ceramics MCQs from Dental Materials, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Dental Materials questions like this
Dental Materials is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Dental Ceramics questions
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
Ideal requirement of metal ceramic casting____________?
Chemical tempering in porcelains is done to interrupt crack propagation by______________?
To prevent porosity in dental porcelain it should be backed________________?
Pyroplastic flow of porcelain is due to___________________?