Which of the following dental treatments is covered under restorative dental treatment?

Restorative dental treatment focuses on repairing and restoring damaged teeth to their proper function and appearance. This typically includes treatments that involve fixing or replacing teeth that have been affected by decay, trauma, or other dental issues.

Crowns are a prime example of restorative treatment because they are used to cover and protect a damaged tooth, restoring its shape and strength. Crowns not only improve the tooth's functionality but also enhance its appearance. They serve a crucial role in protecting the integrity of the tooth structure, thus fitting well within the definition of restorative dental care.

Other treatments mentioned, such as X-rays, cleanings, and dentures, serve different purposes. X-rays are diagnostic tools used to identify dental issues, cleanings are preventive care methods aimed at maintaining oral health, and dentures are a form of prosthetic treatment rather than restorative work on existing teeth. Therefore, crowns are the most directly aligned with the goal of restorative dental treatment.