Biomaterials in op
Biomaterials in ophthalmology
Natural and synthetic hydrogels physically resemble the eye tissue and hence have been used in ophthalmology as soft contact lenses. Soft contact lenses are made of transparent hydrogel with high oxygen permeability, Hard contact lenses are made of (methylmethacrylate) and cellulose acetate but flexible contact lenses are made from silicone rubber.
The necessary requirement for a successful dental implant are fixation in the Jaw bone and formation and maintenance of a suitable permuce cossal seal ,bone ingrowth well occur if relative movement of implants and host elevator bone is limited during the post- implantation healing period. Biopolymers are used in dental treatment to substitute for defects in tissues. Major requirements of dental polymers include translucence and abrasion resistance insolubility in oral fluid, non-toxicity, relatively high softening point ,easy fabrication and repair . The most widely used polymer for dental use is polymethylmethacrylate and its derivatives, and polysulfone .