Final answer:
The dental assistant's stool is normally positioned 4 to 6 inches higher than the operator's stool to provide better visibility and assistance during dental procedures.
Step-by-step explanation:
The dental assistant's stool is typically positioned 4 to 6 inches higher than the operator's stool. This height difference is crucial for several reasons. First, it gives the dental assistant a better vantage point to view the oral cavity and the dentist's working area. Good visibility is essential to anticipate the dentist's needs and assist without any obstruction. Secondly, it facilitates the dental assistant in handling instruments, materials, or other tasks efficiently due to the angle of view and reach. Therefore, a dental assistant's optimal positioning plays a significant role in effective dental procedures.