Always expose the teeth maximally. There is a "cemento-enamel junction" on denture teeth so end your wax on that border. On the buccal there should be a scalloped gingival contour. Never have wax on the occlusal surface.
The lingual of the teeth also have to be exposed. Why? When the denture is invested, the stone and plaster have to grab the teeth. If you cover the lingual with wax, the investment will never reach the teeth. When the wax is removed there will be a space between the investment and the teeth. This allows the teeth to move and change the occlusion.
Teeth that move are called "floaters." They have to be glued back in place. "Back in place" is the best guess of the lab tech.
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©1999 by Julius Rosen, D.D.S.