The proper shape of the Tray Gel material is very important: most of the material should be in the front sloping to very little in the back. Hold the tray under cold running water and smooth the surface with your fingers.
Accu-Dent Maxillary Impression Make sure a small amount of Tray Gel is pushed through the large holes in the tray for retention. The mix will appear dry at first but do not add additional water. Mix the Tray Gel using 70 ☏ water measured to the designated line on the vial. Back load the syringe Replace the plunger and express out any air. Mix the Syringe Gel using 70 ☏ water measured to the designated line on the vial. Palpate where the palatal tissues are displaceable (glandular area) and mark. Post Dam Locate the physiologic posterior palatal seal area by having patient say “ah” Using an indelible stick, mark the palate just distal to where the palate vibrates. Accu-Dent System 1 Irreversible hydrocolloid (hydrophilic) Two viscosities Non-slumping Premeasured sealed packaging Syringe delivery Temperature controlled Unique tray design Single entry impression system Pour impressions in plaster with adequate bases including the central “tongue” area of the mandibular impression. The preliminary impression should have no major pressure spots or voids and it should capture all peripheral extensions. Dense mix of plaster Avoid entrapment of air bubbles Pour the impression with adequate plaster to create a base Note: The plaster should capture the contours of the labial-buccal border. Insert tray Seat posterior portion Rotate the anterior portion into position Border mold the impression Completed impression Maxillary Alginate Impression Mandibular Alginate Impression Ideal impression should: Show no pressure spots Record the ridge, peripheries, retromolar pad, and the retromylohyoid fossa. Have the patient lift their tongue and displace it anteriorly. Mandibular Alginate Impression Seat the tray and hold it firmly in position. Preliminary Impressions Mix alginate and load tray Tray ready to insert Alginate Mixing Tips: Message the lips and cheeks to border mold the peripheries. Use the mirror handle to retract the lips as you rotate the tray into position. This is especially true for the maxillary impression to reduce the likelihood of gagging. It is often recommended to use slightly less water than the directions specify to achieve a thicker mix. Mix in a vigorous manner using sweeping strokes against the walls of the mixing bowl. Practice tray insertion Mix the alginate with the round edge spatula. Preliminary Impressions Spray alginate adhesive onto tray **Note: the pts existing denture can be used to help select an appropriate size tray. Warm the periphery wax in a warm water bath, insert in patients mouth and mold the periphery wax to the intraoral contours. Preliminary Impressions Select a stock tray Extend tray only where necessary with soft periphery wax Warm the periphery wax in a warm water bath, insert in patients mouth and mold the periphery wax to the intraoral contours Spray with tray adhesive Irreversible hydrocolloid impression The preliminary impression should have no major pressure spots or voids and it should capture all peripheral extensions Pour impressions in plaster with adequate bases including the central “tongue” area of the mandibular impression Preliminary Impressions – Armamentarium -Alginate (reversable hydrocolloid) -Tray Adhesive -Edentulous metal stock trays -Plastic mixing bowl -Round edge spatula -Periphery wax -Water bath -Mouth mirror -2×2 gauge ** An accurate preliminary cast that records all anatomic landmarks that should be covered by a denture permits fabrication of properly extended custom trays that will expedite border molding and facilitate a quality final impression.
will be slightly overextended but must essentially capture the 3-D contours of the vestibular borders of the limiting structures. Requirements: -must capture all intraoral landmarks, retromolar pads, retromylohyoid space, hamular notches, etc.
Preliminary Impressions Purpose: -for diagnosis and construction of custom impression trays. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission. Preliminary Impressions John Beumer III, DDS, MS Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry and Frank Lauciello DDS Ivoclar Vivadent This program of instruction is protected by copyright ©. Complete Dentures – Preliminary Impressions - Course Transcript
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