Free RDA Dental Instruments and Tray Setups Questions and Answers 1 — Questions and Answers
Question 1: Which instrument is used to carve the occlusal anatomy into a fresh amalgam restoration?
- Hollenback carver
- Spoon excavator
- Amalgam carrier
- Discoid-cleoid carver (Correct answer)
Correct answer: Discoid-cleoid carver
The discoid-cleoid carver is a double-ended instrument specifically designed for carving occlusal anatomy. The discoid (disc-shaped) end is used for carving and shaping larger surfaces, while the cleoid (claw-like) end is used for defining grooves and fossae.
Question 2: What are the three instruments that comprise the 'basic setup' for most dental procedures?
- Mirror, scaler, cotton pliers
- Explorer, probe, mirror
- Mouth mirror, explorer, cotton pliers (Correct answer)
- Cotton pliers, condenser, burnisher
Correct answer: Mouth mirror, explorer, cotton pliers
The basic setup, also known as the examination setup, consists of the mouth mirror, explorer, and cotton pliers. These three instruments are fundamental for nearly every dental procedure, used for visualization, examination of teeth for decay, and handling small items.
Question 3: Which hand instrument is used to place and shape composite resin material into a cavity preparation?
- Amalgam condenser
- Plastic filling instrument (Correct answer)
- Ball burnisher
- Gingival margin trimmer
Correct answer: Plastic filling instrument
A plastic filling instrument, often made of coated metal or plastic, is used to place, condense, and shape composite materials. Its material prevents the sticky composite resin from adhering to the instrument surface, allowing for smooth manipulation.
Question 4: On a pre-set tray, instruments are typically arranged from left to right in what order?
- Smallest to largest
- Alphabetical order
- Order of use (Correct answer)
- Grouped by function (e.g., all carvers together)
Correct answer: Order of use
Instruments on a tray are arranged in the sequence they will be used by the dentist. This ergonomic setup allows the dental assistant to pass instruments efficiently without having to search for the next one, improving the workflow of the procedure.
Question 5: The instrument with a small, spoon-shaped working end used to remove soft carious dentin is the:
- Spoon excavator (Correct answer)
- Enamel hatchet
- Wedelstaedt chisel
- Periodontal probe
Correct answer: Spoon excavator
The spoon excavator is designed specifically for the removal of soft, decayed dentin from the cavity preparation. Its sharp, spoon-like edges allow the dentist to gently scoop out the caries without removing healthy tooth structure.
Question 6: During a crown preparation, which handpiece and bur combination is primarily used for rapid reduction of tooth structure?
- Slow-speed handpiece with a latch-type round bur
- High-speed handpiece with a diamond bur (Correct answer)
- Prophy angle with a rubber cup
- Contra-angle with a finishing bur
Correct answer: High-speed handpiece with a diamond bur
The high-speed handpiece, which operates at very high RPMs, is used for bulk removal of tooth enamel and dentin. Diamond burs are typically used with the high-speed handpiece for this purpose due to their superior cutting efficiency on hard tooth structure.
Free RDA Dental Instruments and Tray Setups Questions and Answers 1
Which instrument is used to carve the occlusal anatomy into a fresh amalgam restoration?