HESI General Chairside Assisting Practice Exam

Which class of motion is represented by transferring an explorer to the dentist?

1. I

2. II

3. III

4. IV

The correct answer is: II

Transferring an explorer to the dentist is classified as Class II motion. This class of motion involves the use of one hand to reposition an instrument, such as an explorer, from one area to another within the operator's field of vision. Class II motion is characterized by the transfer of the instrument within the working area, which means that the assistant does not need to move their body or shift their position significantly; they can maintain a stable stance while reaching to hand over the instrument. This type of motion is efficient and helps to streamline procedures, minimizing the time and movement needed while ensuring that the dentist has the tools they require to perform their work effectively. In contrast, other classes of motion describe different levels of complexity and movement. Class I involves movements made with the fingers only, Class III includes movements that require the fingers and wrist, and Class IV encompasses more extensive movements where the entire arm and shoulder are used. Thus, Class II is the most appropriate classification for the action of handing over an explorer.