Final answer:
For provisional restoration after a Class II inlay preparation, materials like acrylic resin or glass ionomer are commonly used owing to their ease of use, quick setting time, and ability to protect the preparation.
Step-by-step explanation:
The material often used for provisional restoration after preparing an inlay Class II preparation is a temporary restorative material such as acrylic resin or glass ionomer. These materials are chosen because they can be easily manipulated, set quickly, and create an adequate seal to protect the tooth and the prepared cavity. This provisional protection is crucial to ensure the tooth remains in good condition while the final, permanent restoration is being fabricated.