title: Advances in Soft Denture Liners: An Update.
abstract: Soft denture liners are used in complete and partial removable dentures to distribute functional loads homogeneously on the denture-bearing tissues. These materials are recommended in cases of irregular bone resorption, bony undercuts, thin atrophic mucosa, immediate prosthesis, healing after implant placement, and for patients with bruxism and xerostomia. The resilient lining materials can be categorized as plasticized acrylic resins or silicone elastomers. The plasticized acrylic resin comprises of acrylic polymers and copolymers, a liquid containing an acrylic monomer and plasticisers, such as ethyl alcohol and/or ethyl acetate responsible for preserving the material softness. The silicone elastomers, consisting of dimethylsiloxane polymers, with a chemical composition similar to that of the silicone impression materials devoid of leachable plasticisers, retain their elastic properties for prolonged periods. Most of the currently available materials have several disadvantages, including color stability, long-term resiliency, abrasion resistance, bond strength and porosity. Several modifications have been done recently to overcome of these disadvantages of the soft liners. The current review summarizes the recent developments in soft liners.
authors.affiliation: Assistant Professor, Department of Dental Health, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia; Department of Dental Biomaterials, Al-Azhar University, Cairo Egypt, e-mail: codriyadh@gmail.com.
authors.forename: Mohammed Ibrahim
authors.initials: MI
authors.lastname: Hashem
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000890:Anti-Infective Agents / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003822:Denture Liners; D006801:Humans; D012826:Silicone Elastomers / Q000737:chemistry; D013499:Surface Properties; D014016:Tissue Conditioning, Dental / Q000295:instrumentation
chemical_list: D000180:Acrylic Resins; D000890:Anti-Infective Agents; D003764:Dental Materials; D012826:Silicone Elastomers
keywords: Soft denture liner; Dental materials; Hardness; Color; Absorption; Solubility; Silicone.