Dimethacrylate resins are currently used for dental fillings. The polymers are set by free radical polymerisation. At present light curing protocols require 40s exposure at 750mW/cm2 per increment (up to 10 increments may be required per filling), to achieve the desired conversion of monomer to polymer. Research is currently being undertaken to develop shorter light curing protocols to reduce treatment times. Rapid curing is however reported to impact on the tensile strength, toughness and hardness of these materials. However, the impact of curing rate on its resultant polymer structure is unknown. The objective is to determine the cross-linked polymer structure of specific dental resins as a function of the light-curing protocol employed. The intermodal cross-linking distances will be measured using SANS providing insight into relative order correlated with the rate of polymerisation.