When working on posterior teeth in quadrants 2 and 3, where should the HVE be placed?

The placement of the High-Volume Evacuator (HVE) is crucial for effective moisture control and to maintain a clear working area during dental procedures. For posterior teeth in quadrants 2 and 3, which correspond to the upper left and lower left segments of the mouth, the HVE should be positioned appropriately to capture saliva, blood, and water from the operatory.

Placing the HVE on the vestibular surface allows for optimal suction of debris and fluids from the field of operation while also minimizing the risk of obstructing the dentist's view and access to the tooth being treated. The vestibular surface is situated adjacent to the oral mucosa on the outside of the teeth, making it ideal for evacuation purposes. This positioning helps in maintaining a dry working environment, which is essential for procedures that require bonding, filling materials, or other interventions that necessitate a clean and dry tooth surface.

Other positions, such as the lingual surface, would not provide the same level of access for suctioning fluids effectively as they are located further away from the area where most of the moisture accumulates during operative procedures. The cephalometric and incisal edges do not align with practical evacuation points when addressing moisture control during the treatment of posterior teeth.