Alginate impressions

Load tray, maximum level at the upper border of the tray.
Periphery wax all the way around can soften the borders
A mirror can be used to retract the cheek as a finger may be too thick in patients with a small oral opening
Check for the correct lateral position and for rotation by lining the handle of the tray with the midline of the patient.
Lower impression taken positioned in front,
Upper impession lay back and upper impression taken from behind.

Pull each cheek apart and push the posterior part of the tray down. Move towards pushing the front of the tray down and pull  the lip foward. This path of displacement of the soft tissues aims to push the air from the sulcus out the front of the mouth.