Removal of Undermined Enamel in Class II cavity is done by:
- A- Chisel.***
- B- Angle former
- C- Excavator.
The correct answer is A- Chisel.
Here's a breakdown of why each instrument is used:
- Chisel:
- Designed specifically for cleaving or splitting off enamel.
- Has a sharp, beveled edge that can effectively break off unsupported enamel without damaging the underlying dentin.
- Used in a push motion to precisely remove undermined enamel in Class II cavities, ensuring a clean and smooth cavity preparation.
- Angle former:
- Primarily used to shape and define the internal line angles of a cavity preparation.
- Has a triangular or pointed tip that's not ideal for cleaving enamel.
- May be used to refine margins or smooth out rough edges after enamel removal, but it's not the primary tool for removing undermined enamel.
- Excavator:
- Used for bulk removal of carious dentin and soft debris.
- Has a rounded or spoon-shaped tip that's not suitable for precise enamel removal.
- Its blunt edges could potentially damage or fracture sound enamel if used for this purpose.
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