Podcast
Questions and Answers
What type of impression materials can be used as secondary impression materials for complete dentures?
What type of impression materials can be used as secondary impression materials for complete dentures?
- Liquid silicone
- Alginates
- Metallic oxide pastes (correct)
- Polyether materials
Why should metallic oxide pastes not be used in stock impression trays?
Why should metallic oxide pastes not be used in stock impression trays?
- They can expand and distort the impression.
- They only work with custom trays.
- They are rigid and do not adapt well. (correct)
- They are too flexible and cannot hold their shape.
What condition must be met for metallic oxide pastes to be used effectively?
What condition must be met for metallic oxide pastes to be used effectively?
- The impression tray should always be disposable.
- The impression tray must be made of metal.
- The impression tray must be filled with a soft lining material.
- The impression tray must be properly designed and attached to the framework. (correct)
In what scenario are metallic oxide pastes NOT used?
In what scenario are metallic oxide pastes NOT used?
Which impression materials are suitable for use with a custom acrylic impression tray?
Which impression materials are suitable for use with a custom acrylic impression tray?
What is a disadvantage of the conventional technique in impression making?
What is a disadvantage of the conventional technique in impression making?
Which impressions are best suited for Kennedy class III and IV dentures?
Which impressions are best suited for Kennedy class III and IV dentures?
How does the conventional technique for impression making differ in its application?
How does the conventional technique for impression making differ in its application?
Which of the following options is NOT a selective pressure technique?
Which of the following options is NOT a selective pressure technique?
What impression material is typically used in the conventional mucostatic technique?
What impression material is typically used in the conventional mucostatic technique?
What is the most critical time frame to prevent volume change after removing an impression from the mouth?
What is the most critical time frame to prevent volume change after removing an impression from the mouth?
How do exudates from hydrocolloid affect gypsum products?
How do exudates from hydrocolloid affect gypsum products?
What is the result of the retarding effect caused by exudates from hydrocolloid on gypsum products?
What is the result of the retarding effect caused by exudates from hydrocolloid on gypsum products?
When should adjustments to the impression be made to ensure the best results?
When should adjustments to the impression be made to ensure the best results?
What kind of surface does a chalky cast indicate concerning the impression process?
What kind of surface does a chalky cast indicate concerning the impression process?
Where should the material be placed when making a maxillary impression?
Where should the material be placed when making a maxillary impression?
What tool should be used to help retract the cheek during the maxillary impression process?
What tool should be used to help retract the cheek during the maxillary impression process?
When the tray is being rotated into the mouth, from which side should this be done?
When the tray is being rotated into the mouth, from which side should this be done?
What is the primary reason for placing material over the rugae during an impression?
What is the primary reason for placing material over the rugae during an impression?
What is the effect of not properly retracting the cheek during a maxillary impression?
What is the effect of not properly retracting the cheek during a maxillary impression?
What is the primary reason for ensuring that the tray does not move during gelation?
What is the primary reason for ensuring that the tray does not move during gelation?
What could result if movement of the tray is allowed during the impression procedure?
What could result if movement of the tray is allowed during the impression procedure?
Who is likely to cause movement of the tray during the gelation process?
Who is likely to cause movement of the tray during the gelation process?
What is a consequence of an inaccurate impression due to tray movement?
What is a consequence of an inaccurate impression due to tray movement?
During the impression procedure, what practice should be avoided in relation to the tray?
During the impression procedure, what practice should be avoided in relation to the tray?
Study Notes
Conventional Impression Technique
- Records the resting form of the ridge without occlusal load.
- Uses soft or less viscous alginate impression material.
- Suitable for tooth-supported partial dentures (Kennedy Class III and IV).
- Not recommended for free-end saddle dentures due to potential tissue ward movement.
- Not to be used with stock impression trays.
Metallic Oxide Pastes
- Can be used as secondary impression materials for complete dentures.
- Used for extension base edentulous areas with custom acrylic impression trays.
- Trays must be properly designed and attached to the partial denture framework.
- Need to be poured within 15 minutes after removal from the mouth to prevent volume change.
Hydrocolloid Exudates
- Have a retarding effect on gypsum products, resulting in a chalky cast surface.
Impression Making Tips
- When making a maxillary impression, place the material in the highest aspect of the palate and over the rugae.
- Use a mouth mirror or index finger to retract the cheek on the side away from you while rotating the tray into the mouth.
- Avoid tray movement during gelation to prevent internal stresses and an inaccurate impression.
- Do not allow the patient or an assistant to hold the tray in position.
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Description
This quiz covers various impression techniques used in dentistry, including conventional methods, metallic oxide pastes, and hydrocolloid exudates. It highlights their applications, advantages, and specific considerations necessary for making effective dental impressions. Ideal for dental students and professionals looking to enhance their understanding of impression materials.
