29 Questions
Which type of impression material is NOT good for undercuts?
ZOE paste
Which type of impression material is irreversible and suffers imbibition?
Alginate
Which type of impression material is best for edentulous arches?
Silicones (PVS)
Which tray selection is recommended for thickness of impression material?
Custom
What is the fusing temperature order for thermoplastic compound?
Black > Red > Green > Grey
What is the recommended time to pour up alginate impressions?
Within 8 minutes
What is the recommended head position during impression taking?
Upright
Which muscle movements are involved in the impression taking process?
Border molding
What is the recommended method to control saliva during impression taking?
Suction & astringent mouthwash
Which side should be retracted with fingers during tray insertion for upper denture impression?
Near side
Which denture impression material has the highest cost?
Polyvinyl Siloxane
Which of the following is the correct sequence of patient and lab visits for impressions and impression materials for complete and partial dentures?
Preliminary Impressions -> Custom trays -> Final Impressions -> Record bases & Occlusion rims -> Intermaxillary Records Set-up -> Trial Denture Processing & Lab Remount -> Insertion Clinical Remount
According to the text, what does the goal of an impression depend on?
Purpose of the impression
What is retention in the context of denture retention?
Adhesion
What is cohesion in the context of denture retention?
Atmospheric pressure (PPS/suction)
What physical property of denture retention can be increased by increasing surface area?
Adhesion
What physical property of denture retention can be increased by increasing contact (closeness)?
Cohesion
Which material is CONTRAINDICATED in dentitions with large gingival embrasures and cemented fixed bridges with high pontics?
Polyvinyl Siloxane
What is the purpose of tray fabrication in the impression process?
To provide a preliminary cast
Which material has greater cohesion to itself than it does to mucosa, allowing it to be easily removed from the mouth before setting?
Hydrocolloid
Which material is known for its slow set and continues to cure over time?
Polysulfide Rubber
What is the purpose of tissue stops in wax block out for complete dentures?
To prevent irritation
What is the main objective of the second impression in the denture fabrication process?
To create a final cast
Which of the following impression materials is best for recording excellent tissue detail without compressing the tissue?
Poly Vinyl Siloxane (PVS)
Which of the following impression materials is less sensitive to moisture than Zinc Oxide-Eugenol (ZOE) and are elastic?
Poly Vinyl Siloxane (PVS)
Which of the following impression materials has the best tear strength and excellent sheer thinning stability?
Poly Vinyl Siloxane (PVS)
Which of the following impression materials is hydrophobic and has poor sheer-thinning properties?
Alginate
Which of the following impression materials is suitable for taking final impressions for complete dentures without significant undercuts and large embrasures?
Poly Vinyl Siloxane (PVS)
Which of the following impression materials requires tissue stops for accurate impressions?
Poly Vinyl Siloxane (PVS)
Test your knowledge on the concepts of syneresis and imbibition with this quiz. Learn about the processes of gel contraction and liquid extrusion, as well as the ability of materials to absorb molecules from their surroundings. Discover the clinical significance of imbibition when maintaining moisture with a paper towel. Challenge yourself and expand your understanding of these phenomena.
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