California Registered Dental Assistant (RDA) Written Practice Exam

When retrieving a used instrument from a right-handed dentist, the assistant can use the ___ of his or her left hand.

1. Last two fingers

2. Thumb and index finger

3. Middle and index finger

4. Thumb and middle finger

The correct answer is: Last two fingers

When retrieving a used instrument from a right-handed dentist, the assistant would use the last two fingers of their left hand. This is because these fingers have the most control and dexterity compared to the other options. The thumb and index finger are not as precise and may not be able to grip the instrument securely. The middle and index finger may also not provide enough control and stability when handling the instrument. Meanwhile, the last two fingers can work together to securely grip and manipulate the instrument with the most precision and dexterity. Therefore, the last two fingers are the best choice for retrieving a used instrument from a right-handed dentist.