What is the primary function of a dental liner?

The primary function of a dental liner is to protect the pulp. Dental liners are typically placed in cavity preparations before restorative materials are applied, serving as a barrier against thermal, chemical, and mechanical stimuli. They are particularly crucial when the preparation is very close to the pulp, as they help prevent irritation and potential pulp damage. This protective layer can minimize the risk of pulpitis, which is inflammation of the pulp, thus ensuring the longevity and health of the tooth after restorative procedures.

In contrast, while aesthetic appeal, enhancement of strength, and acting as a filler material are important considerations in dental restorations, they do not represent the primary function of a liner. Liners are specifically designed for pulp protection, rather than for cosmetic purposes or to provide structural support to the tooth.