e.g. A) Hand mixing. i) Kneading. Impression compound – wet kneading, putty consistency Elastomers; ii) Circular motion (with glass slab & spatula) eg. Non-Pressure (Mucostatic) This theory uses the passive position of oral mucus membranes. The variety of impression materials and the range of working characteristics of these materials, make possible the development of impression procedures best suited for specific conditions. from. ABSTRACT: Impression is basically an interaction between tissues and impression material. Impression of a tissue in a resting state prevents it from undesirable forces all over the day. Fig. Impression compound; ii) Mucostatic e.g. The mucostatic impression of the soft tissue areas, already taken, is inserted in the mouth (Fig. ... Concept of mucostatic was introduced Impression plaster; V) Based on the manipulation. This is possible only if the impression material is watery and virtually requires no pressure to place it against tissues. Such an impression will not cover enough The impression is made with oversized or spaced trays with no border seal or border refining and very fluid impression material Mucostatic impression records the soft tissues in their resting state, thus no or minimal pressure is applied during impression taking. Fig. Minimal- pressure/ Mucostatic theory. Zoe impression paste, polysulfide; iii) Vigorous mixing. e.g. The theories actually describe the amount of pressure required to record an impression that improves the accuracy & functions related to denture during different stages of the evolution of impression techniques. e.g. Mucostatic theory (based on Pascal's law) sets out to record the mucosa in its static (supported by underlying basal bone), undisturbed form. This type of impression covers only firmly attached mucosal 3: Mucostatic impression of the edentulous areas. Complete denture impression is a negative registration of the entire denture bearing, stabilizing and border seal areas of either the maxilla or DISADVANTAGES; 1. Impression Making for Complete Denture Impression generally is a negative likeness or copy in reverse of the surface of an object. Selective- pressure theory This technique has the advantage of ensuring a close adaptation of the denture base to the entirety of the mucosa and hence enhancing retention. Review of literature was done by Zinner and Sherman in1981 assuming that any important technique/theory of impression making published in dental journal is eventually published in a textbook.3 Analysis of history on complete denture impression making can be done era wise i.e. 4: Metallic stock tray chosen to cover the whole arch.The arrow indicates the site of finger pressure over the edentulous area. Dental impression is an imprint or negative likeness of the teeth and/or edentulous area and adjacent tissue. 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