“…Flexible dentures have got various advantages over the traditional rigid denture bases. Translucency of the material picks up underlying tissue tones, making it almost impossible to detect in the mouth. No clasping is visible on tooth surfaces (when used in manufacturing of clear clasps) improving aesthetics. The material is exceptionally strong and flexible. Free movement is allowed by the overall flexibility. Complete biocompatibility is achieved because the material is free of monomer and metal, these being the principal causes of allergic reactions in conventional denture and partial techniques. Flexible dentures will not cause sore spots as seen with rigid acrylic resins. Flexible dentures may be used as an alternative treatment plan in rehabilitating the anomalies such as Ectodermal dysplasia.
It is nearly unbreakable, clear or pink colored like the gums, can be built quite thin, and can form both the denture base and the clasps as well. The clasps are built to curl around the necks of the teeth and they are practically indistinguishable from the gums that normally surround the teeth due to its opalescence. This type of partial denture is extremely stable and retentive, and the elasticity of the flexible plastic clasps keeps them that way indefinitely. It has superior aesthetics, no metallic taste and is non-allergic. Free movement is allowed by the overall flexibility and can, therefore, be referred to as “a built in stress breaker”. Long term health of tissues and teeth is maintained due to their gentle massaging action without adversely loading abutments…”
(Thumati et al. Flexible Dentures in Prosthodontics – An Overview, Indian J Dent Adv 2013; 5(4): 1380-1385)