Bars and Pontics

Bars

For larger spaces in the posterior areas, a bar is often added to improve structural integrity, instead of a tooth-shaped void.

Pontics

A virtual pontic is a tooth-shaped placeholder in an aligner created in the space left by missing teeth. Since the aligner does not cover a tooth in this location, there is a resulting void in the aligner. The void can be painted or filled to create the appearance of a tooth in that space.