Abstract
Denture base materials of the past and present are reviewed. Hypersensi-tivity stomatitis venenata is an uncommon cause of "denture sore mouth. " Four cases are cited in evidence that acrylic dentures, even when heat cured, can produce a hyper sensitivity type of stomatitis venenata. The management of acrylic hypersensitivity by the substitution of polystyrene as a denture base material is recommended.