Podcast
Questions and Answers
What is the function of the spacer in a custom tray?
What is the function of the spacer in a custom tray?
- To stabilize the tray in the mouth
- To properly position the tray during border molding procedure (correct)
- To provide support for the lip while making impression
- To prevent distortion of the material at the final stage
What is the purpose of applying separating media on the cast?
What is the purpose of applying separating media on the cast?
- To prevent acrylic resin from sticking to the cast (correct)
- To ensure smoothness of the exposed surfaces of the tray
- To provide relief in specific areas of the oral structures
- To adapt wax over relief areas marked on the cast
What is the recommended distance from the sulcus to the handle in fabricating a handle for a custom tray?
What is the recommended distance from the sulcus to the handle in fabricating a handle for a custom tray?
- 2 cm (correct)
- 1 cm
- 3 cm
- 4 cm
When should trays be sterilized?
When should trays be sterilized?
What is the function of a tray handle?
What is the function of a tray handle?
What should be done with undercuts on the primary cast?
What should be done with undercuts on the primary cast?
What should be done with sharp corners or edges on a custom tray?
What should be done with sharp corners or edges on a custom tray?
Why are disposable trays recommended?
Why are disposable trays recommended?
What is the purpose of an impression tray in dentistry?
What is the purpose of an impression tray in dentistry?
What are the requirements of an impression tray?
What are the requirements of an impression tray?
What is the recommended border extension of an impression tray?
What is the recommended border extension of an impression tray?
What should be the handle design of an impression tray?
What should be the handle design of an impression tray?
Which material can be used to fabricate metallic trays?
Which material can be used to fabricate metallic trays?
What is a dental impression?
What is a dental impression?
What is the main difference between stock trays and custom trays?
What is the main difference between stock trays and custom trays?
What factors affect the selection of stock trays?
What factors affect the selection of stock trays?
What is the purpose of stock trays?
What is the purpose of stock trays?
What are custom trays made from?
What are custom trays made from?
What determines the material choice for custom trays?
What determines the material choice for custom trays?
What do spacer and stop trays use to provide extra space for impression material with higher viscosity?
What do spacer and stop trays use to provide extra space for impression material with higher viscosity?
Study Notes
- According to the method of fabrication, there are stock trays and custom trays or special trays for making dental impressions.
- Stock trays are ready-made and come in specific sizes, while custom trays are fabricated based on a particular patient's cast.
- Stock trays are reusable after sterilization, while custom trays are unique to the patient and discarded.
- Stock trays serve to carry impression material to the mouth and support it during polymerization. They are available in different materials and sizes.
- Factors affecting selection of stock trays include the type of mouth, type of impression material, size of the arch, and the form of the arch.
- Custom trays are made from a cast recovered from primary impression and used to make a final impression. They are more accurate and comfortable for the patient.
- Custom trays can be made of metallic or non-metallic materials, such as cold cure acrylic resin, hot cure acrylic resin, or light cure acrylic resin.
- The material choice for custom trays depends on various factors such as fabrication time, material properties, and hazardous effects.
- Close-fit trays are directly adapted to the cast, while spacer and stop trays use a wax spacer to provide extra space for impression material with higher viscosity.
- Criteria for special tray construction include not impinging on movable structures, extending borders beyond the vestibular sulcus, and ensuring sufficient rigidity and thickness.
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Description
Test your knowledge about dental impression trays and their use in prosthetic dentistry with this quiz. Learn about the definition and purpose of dental impressions and impression trays in creating positive reproductions of teeth and soft tissues.
