(dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth WordNet 3.0 & Open English WordNet

Dental restoration, dental fillings, or simply fillings are treatments used to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants. Wikipedia

treatments to restore function, integrity, and morphology of teeth Wikidata

Any material used to fill a cavity in a tooth or the result of using such material. Wiktionary

In dentistry. Wiktionary (translation)