Podcast
Questions and Answers
What is the purpose of an impression tray in dentistry?
What is the purpose of an impression tray in dentistry?
- To provide support for dental implants
- To carry, confine & control the impression material in the patient's mouth (correct)
- To simulate the finished denture outside the mouth
- To shape the teeth and soft tissues in the mouth
What are the requirements of an impression tray?
What are the requirements of an impression tray?
- It should retain its shape throughout the impression procedure and while pouring stone on the impression (correct)
- It should extend 2mm beyond the vestibular depth with interference with muscle or frenal attachment
- It should be flexible and thin to easily adapt to the patient's mouth
- It should be made of a material that dissolves after taking the impression
How should the border extension of an impression tray be positioned?
How should the border extension of an impression tray be positioned?
- At the same level as the vestibular depth to ensure maximum coverage
- 2mm short of the vestibular depth with no interference with muscle or frenal attachment (correct)
- 1mm short of the vestibular depth to avoid overextension
- 1cm beyond the vestibular depth for extra support
Which material can be used to fabricate metallic trays?
Which material can be used to fabricate metallic trays?
What type of trays can be classified as non-metallic?
What type of trays can be classified as non-metallic?
What is the function of the spacer in the custom tray?
What is the function of the spacer in the custom tray?
What is the function of the handle in the custom tray?
What is the function of the handle in the custom tray?
What is the purpose of applying a separating medium on the cast?
What is the purpose of applying a separating medium on the cast?
Why should disposable trays be recommended?
Why should disposable trays be recommended?
What is the purpose of fabricating two posterior handles for mandibular trays?
What is the purpose of fabricating two posterior handles for mandibular trays?
What type of impression material is suitable for close-fit trays?
What type of impression material is suitable for close-fit trays?
What is the primary purpose of stock trays?
What is the primary purpose of stock trays?
What type of custom tray uses wax spacer to provide space for impression material?
What type of custom tray uses wax spacer to provide space for impression material?
Which factor affects the selection of stock trays?
Which factor affects the selection of stock trays?
What are the materials used for fabricating custom trays?
What are the materials used for fabricating custom trays?
Study Notes
- Method of fabrication of trays: Stock trays (full arch, sectional, quadrant), Custom trays or Special trays
- According to the presence or absence of teeth: Edentulous trays (rounded cross-section), Dentulous trays (square cross-section)
- Stock trays: Reusable, comes in specific sizes, used to make primary impression, materials include Al, Tin, Brass or Plastic
- Factors affecting selection of stock tray: Type of impression material, size of the arch, form of the arch, and coverage of anatomical landmarks
- Custom trays: Fabricated on a patient's cast, unique to the patient, used for making final impression, materials include shellac base plate, impression compound, and cold, hot or light cure acrylic resin
- Factors affecting selection of custom tray: Materials used, compatibility with impression material, and accuracy of fit
- Types of custom trays: Close-fit tray, tray with spacer and stops
- Close-fit tray: Adapted directly onto the cast without wax spacer, used with impression materials of low viscosity
- Tray with spacer and stops: Uses wax spacer to provide space for impression material, used with impression materials of high viscosity
- Advantages of special trays: More accurate impression, even thickness of impression material, easier fabrication, better retention, and less bulky.
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Description
Test your knowledge about dental impression trays and their usage in prosthetic dentistry. Learn about the definition of dental impressions and the purpose of impression trays.
