California Registered Dental Assistant (RDA) Written Practice Exam

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What is the correct sequence of dental instruments for a class I amalgam restoration tray based on the order of use?

  1. Excavator, Condenser, Burnisher, Discoid-Cleoid

  2. Burnisher, Excavator, Condenser, Discoid-Cleoid

  3. Discoid-Cleoid, Burnisher, Excavator, Condenser

  4. Condenser, Discoid-Cleoid, Burnisher, Excavator

The correct answer is: Excavator, Condenser, Burnisher, Discoid-Cleoid

When performing a class I amalgam restoration, the correct sequence of dental instruments to be placed on the tray in the order of use is as follows Excavator, Condenser, Burnisher, Discoid-Cleoid. This is because a class I restoration requires the removal of decay, placement of the amalgam filling, and shaping and polishing of the filling. The excavator is used first to remove any decayed tooth structure, followed by the condenser to pack the amalgam filling into the prepared cavity. The burnisher is then used to shape and smooth the filling, and finally the discoid-cleoid is used for proper carving and contouring. Options B, C, and D are incorrect because they do not follow the correct sequence of instrument use. For example, option B starts with the burnisher which is used last in the sequence for shaping and polishing. This

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