Maxillary alginate impression ratio free#

The handles for close-fitting trays are best designed to be intraoral.Where these are unavailable, a medium-bodied silicone material may be used.Usually used with impression materials that are non elastic or rigid once set, typically zinc oxide eugenol paste.They allow pressure to be exerted on the denture-bearing area during the impression-taking procedure.

Maxillary alginate impression ratio free#

Where the majority of the denture-bearing area is free from large undercuts, closefitting trays should be used.In selection of an impression tray and material, the primary considerations are the amount of undercut present and whether any areas of the mucosa are mobile or unsupported. WHAT TO CONSIDER WHEN SELECTING AN IMPRESSION TRAY AND MATERIAL? It should have 2 mm relief near the sulcus so that green stick compound can be used to do border moulding.It should have a contrasting colour to make its margins appear prominent when placed in the patient’s mouth.It should not react with the impression material.It should be rigid even in thin sections.It should be at least 2 mm thick in the palatal area and lingual flange for adequate rigidity.The tissue surface should be free of voids or projections.It should be dimensionally stable on the cast and in the mouth.It should be well adapted to the primary cast.A special tray is a custom made device prepared for a particular patient which is used to carry, confine and control an impression material while making an impression.