3: Mucostatic impression of the edentulous areas. Impression of a tissue in a resting state prevents it from undesirable forces all over the day. from. Impression Making for Complete Denture Impression generally is a negative likeness or copy in reverse of the surface of an object. ... Concept of mucostatic was introduced i) Kneading. The impression is made with oversized or spaced trays with no border seal or border refining and very fluid impression material DISADVANTAGES; 1. Complete denture impression is a negative registration of the entire denture bearing, stabilizing and border seal areas of either the maxilla or e.g. 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. Zoe impression paste, polysulfide; iii) Vigorous mixing. 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. Impression compound – wet kneading, putty consistency Elastomers; ii) Circular motion (with glass slab & spatula) eg. e.g. The mucostatic impression of the soft tissue areas, already taken, is inserted in the mouth (Fig. Various theories are: Definite-Pressure/ Muco-compressive theory. Non-Pressure (Mucostatic) This theory uses the passive position of oral mucus membranes. 5). ABSTRACT: Impression is basically an interaction between tissues and impression material. To achieve this the impression of the arch should be made without any pressure exerting on it Minimal- pressure/ Mucostatic theory. This type of impression covers only firmly attached mucosal Mucostatic theory (based on Pascalís law) sets out to record the mucosa in its static (supported by underlying basal bone), undisturbed form. Impression compound; ii) Mucostatic e.g. 4: Metallic stock tray chosen to cover the whole arch.The arrow indicates the site of finger pressure over the edentulous area. A) Hand mixing. Mucostatic impression records the soft tissues in their resting state, thus no or minimal pressure is applied during impression taking. Such an impression will not cover enough This is possible only if the impression material is watery and virtually requires no pressure to place it against tissues. Fig. e.g. Selective- pressure theory Mucostatic theory (based on Pascal's law) sets out to record the mucosa in its static (supported by underlying basal bone), undisturbed form. 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