A right-handed dentist is doing a preparation on 30MO. The dental assistant places the HVE tip on the:

In this situation, the placement of the High-Volume Evacuator (HVE) tip is critical for efficient suction and a clear field of operation. When a right-handed dentist is working on the maxillary first molar, specifically the mesial-occlusal (30MO) preparation on tooth #30, the HVE tip is ideally positioned to promote optimal visibility and access for the dentist.

The correct placement of the HVE tip on the lingual side of #30 serves several purposes. It allows for effective removal of debris, saliva, and water from the oral cavity while keeping the area dry and clear for the dentist to work on. Situating the HVE on the lingual aspect also aligns with the right-handed dentist's working angle, as it provides better access to the areas being prepared while not obstructing the dentist's line of sight.

In contrast, placing the HVE tip buccally alters the assistant's ability to maintain a clear operatory field as it could potentially interfere with the dentist's hands and instruments. Placing the tip occlusally on an adjacent tooth, like #31, does not provide the necessary suction to manage the flow of fluids around the working area of #30. Overall, positioning the H