Impression materials too have gone through a tremendous phase of development. From olden day clay, to wax to the modern day elastomers, they have indeed not only improved the quality of the impression but also directly influenced the technique used to manipulate these materials during impression making. Many a times both the impression technique as well as the materials have complemented each other in producing an accurate impression incorporating all principles for an ideal impression making. This book has made an attempt to summarize all the major impression techniques and materials used in modern day Prosthodontic therapy.