this invention provides a method and material compositions for producing objects containing in whole , or in part , biomedical polymers , especially those having dental use . microwave sensitive material compositions are injected under pressure into a mold , the mold containing a replica of a body tissue or tissues . while hydraulic pressure is maintained on the material , a microwave source emits metered electromagnetic energy for hardening the material in the 3 - dimensionally defined space . for dental and other applications , the mold making , injection and hardening are done sequentially to rapidly produce an object which accurately fits the mold .