Operative Dentistry - Dental liners and bases - Part 1
Dental Liners and Bases Liners and Bases • Materials placed between dentin and the restoration to provide pulpal protection. • Protective needs for a restoration vary depending upon: 1) The extent and location of the preparation. 2) The restoration material to be used. Sealers: Materials provide a protective coating to the walls of the prepared cavity &a barrier to leakage at the interface of the restorative material and the walls. Liners: Are relatively thin layers (< 0.5 mm) of material used primarily to achieve a physical barrier to bacteria and their products and /or to provide a therapeutic effect, such as anti-bacterial or pulpal sedative effect. Liners are usually applied only to dentin cavity walls that are near the pulp. Bases ( cement bases 1-2 mm): Are used to provide thermal protection for the pulp and to supplement mechanical support for the restoration by distributing local stresses from the restoration across the underlying...