for the large flange, i would imagine that just comes form the amount of material used. so, in that case...too much material. as for the large void. i seen in another video where they say to seat edentulous impression from anterior to posterior. thats suppose to allow air to escape out the back. hope this helps, i seen nobody responded and i was curious on a confident answer on large flange myself lol
Make sure the custom tray is adapted well to the preliminary cast. Ensure the tray is seated properly intraorally. Do not overload the tray - make sure just enough material is loaded to capture all anatomy or else the excess will spill into the vestibule, displacing the vestibular tissue and enlarging the border. Lastly border mold sufficiently to contour the periphery and ensure no overextension of the flange area of the impression. See this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6gLs5iPWMD0.html
Both zinc oxide eugenol (ZOE) and rubber base (polysulfide) impression materials can be used to make acceptable impressions. ZOE materials tend to be less viscous (better flow) and hydrophilic (enhances compatibility with moist tissue such as mucosa), but are rigid and difficult to remove from ridges/arches with significant undercuts. Polysulfides are elastomeric and can be removed more easily from undercuts but are a bit less hydrophilic, and have a poor, sulphur taste. Both require pouring within a short time after the impression is made. We switched to polyvinyl siloxanes (PVS) because they can be used in multiple situations, have virtually no taste, can be poured much later after the procedure and have good dimensional stability. Any of these materials can be used with success if manipulated properly.
@@DrLoneyDal Thank you so much sir..I'd just like one more advice on which consistency of elastomers to use in complete denture final impression..light medium or heavy body..?
@@beingcreative1147 Most find that light- or medium-body viscosities are preferable. Especially when mucosa may be moveable or compressible, using a material with slightly less viscosity may help minimize tissue distortion and/or compression when making the impression.
@@DrLoneyDal thank you so much sir Have been using zinc oxide eugenol since dental school days, but now shifting towards PVS in some cases due to ease of manipulation.. Following ur videos whenever im stuck☺️
When voids are present, the impression may or may not need to be remade. It depends on the number and size of the voids. As the number or the size of the voids increases, the more likely the need to remake. Small voids can be repaired with sticky wax, followed by an overlaying layer of wax with a lower melting temperature to blend with the surrounding contours. Larger voids are harder to repair and in many cases require a remake.
