Dental Impressions and Trays Quiz

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Questions and Answers

What is the primary purpose of a preliminary impression?

  • To create a special tray.
  • To capture fine details of the arch.
  • To record dimensions of the arch. (correct)
  • To construct the final denture base.

Which type of tray is used for secondary impressions?

  • Special tray. (correct)
  • Stock tray.
  • Custom tray.
  • Plastic tray.

What is the usage of a preliminary impression?

  • Pouring of master cast.
  • Pouring of primary cast and construction of special tray. (correct)
  • Recording fine details of the denture.
  • Completion of the denture.

What type of impression is used to record the fine details of the arch?

<p>Secondary impression. (B)</p> Signup and view all the answers

Which of the following statements is true about preliminary and secondary impressions?

<p>Preliminary impressions are made before secondary impressions. (D)</p> Signup and view all the answers

What are the two types of trays mentioned?

<p>Stock trays and special trays (B)</p> Signup and view all the answers

Which technique is NOT listed for taking final impressions?

<p>Consistency impression technique (C)</p> Signup and view all the answers

What is the likely purpose of stock and special trays in dentistry?

<p>To take impressions of teeth (B)</p> Signup and view all the answers

Which impression technique applies pressure to capture the shape of the mouth?

<p>Selective pressure impression technique (C)</p> Signup and view all the answers

What characteristic do the trays share as observed in their design?

<p>They are flexible and empty (D)</p> Signup and view all the answers

What are the two main parts of a dental tray?

<p>Body and handle (D)</p> Signup and view all the answers

What are the components of the tray's body?

<p>Floor and flanges (B)</p> Signup and view all the answers

What is the purpose of the handle on a dental tray?

<p>To allow for easier grip (A)</p> Signup and view all the answers

Which of the following describes the body of a dental tray?

<p>A flat, mesh-like structure (D)</p> Signup and view all the answers

Which feature is NOT a part of the dental tray's body?

<p>Handle (D)</p> Signup and view all the answers

What is another name for the muco-static impression technique?

<p>Minimal pressure impression technique (D)</p> Signup and view all the answers

Which impression technique is registered when tissues are at function?

<p>Muco-compressive impression technique (C)</p> Signup and view all the answers

In which impression technique are the pressures applied selectively?

<p>Selective pressure impression technique (A)</p> Signup and view all the answers

What is a characteristic of the impression trays depicted in the diagram?

<p>They feature rounded edges and a cap-like form. (C)</p> Signup and view all the answers

Which technique is specifically known for using minimal pressure during impression registration?

<p>Muco-static impression technique (B)</p> Signup and view all the answers

What materials are commonly used to make stock trays?

<p>Metal and plastic (C)</p> Signup and view all the answers

What is the necessary depth of impression material for a stock tray's basal seat area?

<p>6mm (D)</p> Signup and view all the answers

What types of stock trays are available?

<p>Perforated and non-perforated (D)</p> Signup and view all the answers

What should stock trays conform to?

<p>The shape and contour of the residual ridge (C)</p> Signup and view all the answers

Which statement about stock trays is incorrect?

<p>They are only made from metal. (B)</p> Signup and view all the answers

What is one characteristic of stock trays?

<p>They come in various shapes and sizes. (B)</p> Signup and view all the answers

Which type of tray is typically available for general use without customization?

<p>Stock trays (B)</p> Signup and view all the answers

What differentiates special trays from stock trays?

<p>Special trays are custom-fitted for specific patients. (B)</p> Signup and view all the answers

Which of the following is NOT a feature of stock trays?

<p>Availability in limited shapes and sizes. (C)</p> Signup and view all the answers

What is the primary purpose of using impression trays?

<p>To take accurate dental impressions. (A)</p> Signup and view all the answers

Which of the following is NOT a possible material for making special trays?

<p>Ceramic (B)</p> Signup and view all the answers

Which material is used for making trays that can cure under light?

<p>Light-curing acrylic resin (B)</p> Signup and view all the answers

Which of these statements about special trays is false?

<p>They are exclusively made from metal. (B)</p> Signup and view all the answers

What type of cast can be used for making special trays?

<p>Diagnostic cast (C)</p> Signup and view all the answers

Which tray material is known for its self-curing properties?

<p>Self-curing acrylic resin (C)</p> Signup and view all the answers

What is one advantage of special trays compared to stock trays?

<p>They fit more accurately to the individual arches. (C)</p> Signup and view all the answers

How does the use of special trays impact the amount of impression material needed?

<p>It reduces the amount of impression material needed. (C)</p> Signup and view all the answers

What economic advantage do special trays provide?

<p>They result in less impression material usage. (A)</p> Signup and view all the answers

What is a comfort-related advantage of special trays for patients?

<p>They are more comfortable compared to stock trays. (B)</p> Signup and view all the answers

What dimensional advantage do special trays offer during impressions?

<p>Less dimensional change is expected. (D)</p> Signup and view all the answers

Flashcards

Preliminary Impression Purpose

Records the overall arch dimensions for the initial cast.

Preliminary Impression Tray

A standard, pre-made tray used for preliminary impressions.

Secondary Impression Purpose

Records detailed arch structure, good for fine detail.

Secondary Impression Tray

A custom-made tray for taking detailed impressions.

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Impression Types

Preliminary and secondary impressions are used in denture procedures.

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Stock Trays

Pre-made trays used for dental impressions.

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Special Trays

Customized trays for specific dental procedures.

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Muco-static impression

Dental impression technique with no pressure.

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Muco-compressive impression

Dental impression with gentle pressure.

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Selective pressure impression

Dental impression with varied pressure for precision.

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What is a dental tray?

A dental tray is a tool used in dental procedures. It has two main parts: a body and a handle.

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What are the parts of the tray's body?

The tray's body has two parts: the floor and the flanges.

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What is the tray's floor?

The floor of the tray is the flat part that holds materials.

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What are the tray's flanges?

The flanges of the tray are the edges or rims that help hold the material in place.

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What is the purpose of the tray's handle?

The handle is designed for a comfortable grip during the dental procedure.

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Impression Tray Components

An impression tray has different parts, including a base, a body, and a handle. The base fits onto the teeth, the body supports the impression material, and the handle provides grip.

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Function of Impression Trays

Impression trays are used to hold the impression material in place in the mouth, allowing for the accurate capture of the teeth and surrounding tissue.

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Perforated Trays

1-Stock trays with holes that allow air to escape during impression taking, ensuring a more accurate cast.

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Non-Perforated Trays

1-Stock trays without holes, typically used for preliminary impressions.

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Tray Depth

The minimum depth of impression material needed in a tray is 6mm.

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Tray Contour

1-Stock trays should match the shape of the patient's mouth for a comfortable and accurate impression.

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Impression Tray Types

There are two main types of impression trays: stock trays and custom trays.

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Custom Trays

Individually fabricated trays tailored to the patient's specific needs, used for taking detailed impressions.

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Custom Trays Purpose

Used for taking secondary impressions, capturing precise details of the teeth for making dentures or other dental restorations.

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Stock Trays Purpose

Used for preliminary impressions, capturing the general shape and size of the teeth.

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Shellac Base Plate

A material used as a base for constructing special trays, known for its ability to be easily shaped and removed.

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Self-curing Acrylic Resin

A type of resin that hardens on its own, used to create special trays directly on a model or a shim.

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Light-curing Acrylic Resin

Another type of resin, requiring a special light to harden, also used for special trays.

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Cast or Swaged Metal

Durable metal materials used for making special trays, known for their strength and longevity.

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Custom Tray Fit

Special trays are designed to match the unique shape of a patient's teeth, ensuring a more accurate impression.

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Less Impression Material

Special trays use less impression material because they fit precisely, leading to reduced waste and cost savings.

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Economic Benefit

Using less impression material with custom trays saves money for both the patient and the dentist.

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Patient Comfort

Custom trays provide a more comfortable fit for the patient, reducing discomfort during the impression process.

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Dimensional Changes

Special trays minimize the amount of impression material used, resulting in less distortion or shrinkage during the impression process.

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