Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal ?
Correct answer: D. Diamond but for porcelain and carbide bur for metal
- A. Carbide bur
- B. Diamond bur
- C. Stainless steel bur
- D. Diamond but for porcelain and carbide bur for metal
Explanation
A diamond instrument is used to cut or adjust porcelain, whereas a carbide bur is more suitable for cutting the metal substructure. Therefore, the combined instrument choice in d is appropriate.
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