Use the following steps to take preliminary impressions: 1. Preliminary cast: is obtained from the preliminary impression and is used to manufacture a custom tray. Stock impression trays are modified to make sectional impressions of the left and right sides of the maxillary arch. Impression compound was used to make preliminary impressions, and excess material crossing midline was trimmed to flush with the margin. Several study models may be constructed in various stages of the treatment. The cast poured into the first impression is positioned in the second impression, which is then poured to make the diagnostic cast. – For alginate 2-3mm gap between tray and tissue. Technique IX: Technique using magnets Preliminary impressions. Technique for Preliminary Impression using StatusBlue® To be used as the matrix for creating a Luxatemp® provisional restoration. Zinc Oxide–Eugenol (ZOE) Synonym(s): primary impression Case study model: is obtained from the case study impression and It is used for observing various existing details prior to tooth preparation. This article reviews the literature published from 1971 to 2015 concerning preliminary impression techniques used in making impressions for patients with microstomia based on various tray designs. The primary cast was poured after tray sections were reassembled extraorally. – For compound 5 … A cordless impression technique was employed to accurately capture fine detail. – A heavy consistency alginate should be used to record the ridge anatomy. 3. Preliminary Impressions Purpose: -for diagnosis and construction of custom impression trays . Selection of the material – Alginate is the preferred material to make preliminary impression. An electronic search was performed across three databases (PubMed, Science Direct and Google Scolar) for relevant citations. -will be slightly overextended but must essentially capture the 3-D contours of the vestibular borders of the limiting structures. Almost all prosthodontic patients require preliminary impressions for diagnostic purposes. This article describes a preliminary impression technique for edentulous patients with microstomia. A stock tray is used to make a preliminary impression, from which a model can be cast. Select the correct size impression tray and ensure its fit in the patient's mouth is correct. Requirements: -must capture all intraoral landmarks, retromolar pads, retromylohyoid space, hamular notches, etc. This is then used for wax to make the tray to be laid down. preliminary impression: in dentistry, an impression made for the purpose of diagnosis or the construction of a tray. 4. In this technique, known as a hydraulic hydrophobic impression, 2,3 a base VPS impression material was used (V-Posil Putty Fast, Voco) in order to capture the preliminary phase of the two-step impression (figure 5). – Other impression materials that record fi ne details are better suited for fi nal impressions. Allow 3-4 mm of space between the tray, teeth, and soft tissues when the tray is positioned in the mouth. The most common material used for this purpose is conventional irreversible hydrocolloid (alginate). – Impression com pound is a stiff, thermoplastic material and is used by many dentists to make preliminary impressions for comp lete dentures. – But impression compound can also be used. 2. 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