Impression Trays in Prosthodontics

<p>Making perforations in the tray (D)</p> Signup and view all the answers

<p>Posterior palatal seal area (D)</p> Signup and view all the answers

<p>To make more accurate impressions than stock trays. (D)</p> Signup and view all the answers

<p>They are specifically designed for one patient's impression. (C)</p> Signup and view all the answers

<p>Less impression material is used with custom trays. (B)</p> Signup and view all the answers

<p>To create an exact replica of the denture bearing area. (D)</p> Signup and view all the answers

<p>The outline must follow specific anatomic landmarks. (A)</p> Signup and view all the answers

<p>They require less time to prepare. (D)</p> Signup and view all the answers

<p>By creating a denture/tissue interface with intimate contact. (D)</p> Signup and view all the answers

<p>Significant differences in shape and size. (A)</p> Signup and view all the answers

<p>Base plate construction (B)</p> Signup and view all the answers

<p>Dusting it with talcum powder or applying vaseline (A)</p> Signup and view all the answers

<p>To soften the shellac material (A)</p> Signup and view all the answers

<p>Cake form (C)</p> Signup and view all the answers

<p>They do not record details accurately (C)</p> Signup and view all the answers

<p>Heating and rolling the edges (A)</p> Signup and view all the answers

<p>To enhance adhesion of the impression material (B)</p> Signup and view all the answers

<p>They reduce the number of visits to the dentist (A)</p> Signup and view all the answers

<p>To accommodate the thickness of impression material (B)</p> Signup and view all the answers

<p>A close-fitting tray without spacer (A)</p> Signup and view all the answers

<p>Modeling compound (A)</p> Signup and view all the answers

<p>They are produced by casting or swaging methods (B)</p> Signup and view all the answers

<p>Alginate or plaster (A)</p> Signup and view all the answers

<p>Metallic materials (C)</p> Signup and view all the answers

<p>An old denture of the patient (C)</p> Signup and view all the answers

<p>Film resin (A)</p> Signup and view all the answers

<p>65-85 degrees C (A)</p> Signup and view all the answers

<p>It is easily constructed (D)</p> Signup and view all the answers

<p>Block out undercuts with base plate wax (B)</p> Signup and view all the answers

<p>During the mixing of powder and liquid (D)</p> Signup and view all the answers

<p>Excessive pressure during adaptation (C)</p> Signup and view all the answers

<p>Immediately after curing (B)</p> Signup and view all the answers

<p>The boundaries of the wax spacer, custom tray, and occlusal stops (B)</p> Signup and view all the answers

<p>Inserting a knife and gently lifting (A)</p> Signup and view all the answers

Custom trays are made individually for each patient to provide a more accurate and detailed impression. They're designed to accurately fit the patient's arches and are discarded after use.

Custom trays are designed to capture a specific impression detail for a specific patient. This allows for a more accurate representation of the denture bearing area.

When making a final impression, the tray outline should be about 2 mm short of the vestibular depth. This ensures capturing the denture-bearing area without extending into movable tissues.

The tray outline should encompass the denture-bearing area, which includes the supporting tissues and minimal extension into movable tissues and muscle attachments.

A final impression should capture the exact replica of the denture-bearing area, creating an intimate contact between the denture and tissues.

An exact replica ensures excellent retention, stability, and support for the denture.

The bulk of the impression material is reduced, resulting in less dimensional changes and minimal tissue compression.

They are made on a preliminary cast, which is a replica of the patient's teeth, allowing for a custom fit.

A process of shaping and solidifying a light-cured material over a spacer on a diagnostic model to create a custom tray.

A thin, pre-shaped material placed on the diagnostic model to define the thickness and shape of the custom tray.

The area on the back of the upper jaw where the tray needs to have a seal to prevent air bubbles from entering the impression.

Making small holes in the tray to improve the retention of the impression material.

A method of making custom trays using plastic sheets and a vacuum or pressure forming machine.

The area where the tray should extend on the maxillary arch. It's located posterior to the vibrating line, which is the area where the soft palate meets the hard palate.

The area where the tray should extend on the mandibular arch. It includes the retromylohyoid space, which is the area behind the last molar.

A type of impression material that requires a close-fitting tray without a spacer. It sets quickly and is often used for relining dentures.

A type of impression material that requires a single layer of baseplate wax as a spacer. It allows more time for manipulation compared to ZOE.

A type of impression material that requires a double layer of baseplate wax as a spacer. It is quick and easy to use, but less accurate than other materials.

The process of creating a customized impression tray using a moldable material that softens when heated and hardens when cooled. Examples include shellac baseplate, modeling compound, and hydroplastic tray material.

The process of creating a customized impression tray using a resin that sets chemically or with the use of light. Examples include self-cure, heat-cure, and light-cure resins.

A material used for dental base plate construction. It is available in sheets of two thicknesses, single for base plates and double for custom trays.

A technique used to prepare a shellac base plate for use. Dusting the cast with powder or applying a light coat of vaseline prevents the material from adhering to the cast.

Process of shaping the shellac base plate to the cast by heating and pressing it.

Thickening the borders of a shellac base plate by heating and rolling the edges to create a double layer.

A thermoplastic material used in dentistry. It comes in cake form (primarily for tray material) and stick form (for impression material).

A type of impression technique using modeling compound. The custom tray is created from a modeling compound impression with a specific thickness removed. This tray is used for a final impression with plaster or paste.

The advantage of using a modeling compound impression technique is that it requires fewer patient visits.

Holes drilled in an impression tray made from modeling compound or shellac, allowing for air escape during impression taking.

A type of tray material that softens when heated to 65-85 degrees Celsius and hardens when cooled in water. It is available as small beads in yellow, pink or white.

Modified methyl methacrylates, widely used for making custom trays because of their ease of construction, rigidity, accuracy, and ability to accept border tracing materials.

The process of preparing a cast for impression tray fabrication by covering undercuts with base plate wax to prevent the tray material from adhering.

A liquid or paste applied to a cast before tray fabrication to create a barrier between the tray material and the cast, ensuring easy separation.

The process of mixing acrylic powder with liquid according to manufacturer instructions, achieving a dough-like consistency suitable for forming a tray.

A thin layer of tray material placed on a form to create a base for the impression tray, ensuring uniform thickness.

The process of shaping the tray material around the cast with light finger pressure, ensuring proper fit and avoiding thin areas.

A handle attached to the tray, designed to facilitate removal and prevent interference with the patient's lip movement during impression procedures.