OPTI-CRYL High Impact Heat Cure Acrylic Denture Base Resin, Original Shade, Powder, 1Lb Bottle. Handling characteristics for both heat cure and microwave techniques. Provides an accurate copy of the wax pattern. Low residual monomer. Biocompatibility with oral tissues. Optimal resistance to flexure fatigue, formulated specifically to resist breakage in dentures and overdentures.