An alive tooth can be restored with a simple filling but a devitalized tooth needs a cap to limit the fracture risk.
In toothless situation, caps are used as bridge supports.

1. Alive tooth reconstruction. An alive tooth can be restored without a cap.

2. Devitalized tooth reconstruction. A devitalized tooth must be covered with a cap.

3. Bridges. Caps are used as supports to realize the bridges with replace the lack teeth.