274+ quick-fire dental facts • tap a card to flip
Adding a nonionic surfactant to silicone impression materials makes the surface more hydrophilic, allowing for better wetting of soft tissues and improved detail capture.
What is the effect of adding a nonionic surfactant to silicone impression materials?
1) Increases hydrophilicity
2) Decreases tear strength
3) Enhances setting time
4) Reduces dimensional accuracy
Light-cured composites do not require mixing, which reduces porosity and staining. They also allow for better control over working time and increased color stability due to the use of aliphatic amines.
What are the advantages of using light-cured composites over chemically cured products?
1) Less porosity, less staining, increased strength, enhanced color stability, and control of working time.
2) Faster curing time, better translucency, and less shrinkage.
3) Longer shelf life and lower cost.
4) Higher wear resistance and easier to manipulate.
Lining materials must have a minimum compressive strength of 5 MPa to withstand the forces in the oral cavity.
What is the minimum compressive strength required for lining materials?
1) 1.0 MPa
2) 3.0 MPa
3) 5.0 MPa
4) 10 MPa
The TLV for mercury vapor set by OSHA is 0.05 mg/m3.
What is the Threshold Limit Value (TLV) for mercury vapor exposure set by OSHA?
1) 0.01 mg/m3
2) 0.02 mg/m3
3) 0.05 mg/m3
4) 0.1 mg/m3
Zinc polycarboxylate cement is a water-based cement.
What type of cement is zinc polycarboxylate?
1) Water-based cement
2) Resin-based cement
3) Oil-based cement
4) Silicate-based cement
Compomers are more correctly termed Polyacrylic acid Modified Composite Resins (PMCRs). They are a blend of glass ionomer and composite resin properties, making them user-friendly and suitable for certain restorative procedures.
What are Compomers more correctly termed?
1) Methacryloxy decyl pyridinium bromide-modified composite resins
2) Polyacid-modified composite resins
3) Polymethacrylate-based composite resins
4) Glass ionomer-modified composite resins
The effect of water sorption on vertical dimension varies with the type of resin.
How does water sorption affect the overall vertical dimension of a denture?
1) It increases the vertical dimension
2) It decreases the vertical dimension
3) It has no effect on the vertical dimension
4) It depends on the type of resin used
Rapid heat-cured acrylic resin has the highest linear shrinkage at 0.97%, which can affect the fit and stability of the denture.
Which of the following denture base materials has the highest linear shrinkage?
1) High-impact acrylic resin
2) Vinyl acrylic resin
3) Conventional acrylic resin
4) Rapid heat-cured acrylic resin
While it has good mechanical properties, poorly placed zinc phosphate cement can cause pulpal irritation.
What is the main disadvantage of using zinc phosphate cement?
1) Low compressive strength
2) Potential for pulpal irritation
3) Difficulty in removal
4) High cost
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