fixed prosthodontics 55555444443333.pptx

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2. Palatal splinting using a two-part tray system two overlying impression trays A primary model is constructed using the fitting surface contour of a previous denture. Palatal tray: create space on the mobile area with wax and rod in the center First impression: low viscosity zinc oxide paste impression in palatal tray.an upward force is maintained until it is apparent that the mobile ridge is just beginning to have pressure applied to it Second impression: special tray impression is made completely encompassing the first tray. It should be inserted from in front,back wards.

3. selective displacement technique/ selective composition flaming technique this technique aims to displace but not distort the flabby ridge as if in function Preliminary impression: mucostatic impression material( eg impression plaster alginate)+cast in stone. Spaced customized tray compound impression taken of the preliminary model(reduces the risk of displacing the flabby ridge) The impression is tried in the mouth and should be quite retentive. The impression is removed and warmed all over except for flabby ridge area. The impression is taken in the mouth,the flabby ridge is compressed but not distorted as the other portions of the impression compound(which are warm) sink into the tissues. The impression is removed inspected and retried in the mouth to check that it is stable.if any instability occurs then the impression should be reheated and re-taken.

4. Two part impression technique: mucostatic and muco displacive combination Preeliminar impression: alginate + convectional tray + primary cast. The displaceable tissue can be marked on the impression and transferred to the primary cast. Special tray: a close fitting cold-cured or light-cured acrylic base with uncovered flabby ridge area. Secondary impression: special tray + zinc oxide-eugenol or medium-bodied silicone. Applying or syringing a thin mix of impression plaster or ligt -bodied silicone in displaceable mucosa with the secondary impression in place Removed as one impression