Final answer:
The form that involves the placement of cuts or adjustments in the preparation to secure a restoration mechanically is the Cavity.
Step-by-step explanation:
The form that involves the placement of cuts or adjustments in the preparation to secure a restoration mechanically is the Cavity. When a dentist prepares a tooth for a filling or other restoration, they remove the decayed or damaged portion of the tooth and create a space or cavity to be filled with a restorative material such as dental amalgam or composite resin.