California Registered Dental Assistant (RDA) Written Practice Exam

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What does the dentist use to reduce the height and contour of a tooth for casting?

  1. Hand file

  2. Diamond bur

  3. Rotary instruments

  4. Chisel

The correct answer is: Rotary instruments

A hand file is a narrow metal tool with ridges on its surface that is used to smooth the edges of a tooth. While it is commonly used for minor shaping and smoothing, it is not precise enough for reducing the height and contour of a tooth for casting. A diamond bur is a small rotary cutting tool with small diamond tips used for precise trimming and shaping of teeth. These burs are typically used for cutting through tooth structure, not for reducing the height and contour of a tooth. A chisel is a flat, metal tool that is commonly used in woodworking and masonry to cut or shape materials. While it may be used in some dental procedures, it is not the primary instrument used for reducing the height and contour of a tooth for casting as it is not precise enough. The correct option, rotary instruments, are small, handheld tools that use high-speed, vibrating tips to

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