mucostatic technique results in a denture, which is closely adapted to the mucosa of the denture-bearing area but has poor peripheral seal. Functional impression can be used very effectively to create stability in cases exhibiting extreme resorption. A mucocompressive impression is first made of the normal tissues with zinc oxide and eugenol using a custom tray. Using these techniques, a mucocompressive impression is recorded for healthy tissues using zinc oxide and eugenol or regular body PVS and a custom tray. MUCOCOMPRESSIVE TECHNIQUE. A mucocompressive impression is first made of normal tissues using Once set, a low viscosity mix of impression plaster is then painted onto the flabby tissues through the window. The impression techniques Following are the different impression techniques that can be used for resorbed mandibular ridges: The functional impression technique. In this technique the basal seat and borders are obtained with the use of impression materials that continue to flow over an extended period of time such as tissue conditioning materials or wax. * ZnO eugenol is mucocompressive/ mucoststic based on thickness used . * The mucocompressive loads when making the impression should be within the physiological limits of the tissues to allow better adaptation and intercuspation on function. The only truly functional or physiological method of making impressions is the so called dynamic impression. The admixed technique. Mucocompressive Technique • The type of the sub mucosa & the relation of the supporting bone to the denture bases show best to record the soft tissues. • Understand and be able to apply the principles and techniques needed for the diagnosis, planning and treatment involved in removable prosthesis construction, including implant retention. • Understand the applications of the dental surveyor. impressions, including mucostatic mucocompressive, , selective pressure func- , tional, and neutral zone impressions. Osborne described the “window” impression technique with a custom tray made with a window over the flabby tissues. Watson described the window technique where a custom tray is made with window over flabby tissue. Standard mucocompressive impression techniques are likely to result in an unretentive and unstable denture as the denture constructed on a model of the flabby tissue in a distorted state. The neutral zone technique. First, is the mucocompressive impression technique, which Prosthetic Procedures records the loose flabby tissue in a compressed form For every patient preliminary impression of in a try to obtain functional support for the denture. For flabby ridge we have different techniques: conventional method: used using a spaced tray 44. • Understand and be able to apply the principles of impression material selection and taking. Mucocompressive Technique • ADVANTAGE: Good retention during function. Following the setting of the impression material, the flabby tissues are painted using with a low viscosity mix of impression material (impression plaster) through the open window. Osborne described a technique where two separate impression trays and impression materials are used separately to record the flabby and normal tissue. 42 43. The use of selective pressure or minimally displaced impression techniques should help to overcome some of these limitations. 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