The assistant's operating zone, with a right-handed operator, is:

The assistant's operating zone is located between 2 to 4 o'clock when working with a right-handed operator. This positioning is critical to ensure efficient teamwork during procedures.

In this zone, the dental assistant has direct access to the necessary instruments and materials while also being able to observe the operator's activities without obstructing their workspace. This placement facilitates effective communication and collaboration, as the assistant can quickly hand over instruments and provide support as needed.

The other options describe different zones that do not align with the ideal positioning for the assistant. For example, 12 to 2 o'clock is typically reserved for the operator's working area. The zones at 10 to 12 o'clock are usually used for dental equipment and overhead lighting, while the area from 8 to 10 o'clock often serves as additional workspace for the assistant but does not provide optimal access for assisting the operator. Understanding these operational zones is essential for ensuring a smooth workflow and enhancing overall efficiency in a clinical environment.