The contemporary restorative dentist has a host of excellent impression materials available for impression making. Materials used without adequate knowledge of their characteristics can impair a successful outcome. Often, the choice of impression material depends on the subjective choice of the operator based on personal preferences and past experienced with particular materials. It would be virtually impossible to perform high quality restorative dentistry without impression materials. For the production of accurate master cast the impression technique far out weights the selection of the impression material. No Available Knowledge Of The Person Making The Impression Material Will Produce Results Greater Than The Skill And Knowledge Of The Person Making The Impression