In dentistry, bases and liners serve multiple purposes; which is NOT one of their uses?

Bases and liners in dentistry are essential materials used for a variety of purposes to protect the pulp and enhance the longevity of restorative procedures. Obtundents refer to the property of reducing sensitivity and pain, particularly when placed over dentin during procedures. Insulators protect the pulp from thermal shock due to hot or cold materials, while sealers prevent microleakage and protect against bacteria entering the cavity.

The function of retainers, however, is not typically associated with bases and liners. Retainers are used to hold or stabilize dental appliances or restorations in place, but they do not offer the protective, insulating, or sealing properties that bases and liners provide. Consequently, it is accurate to state that retainers do not fall within the uses of bases and liners in dental practice.