30 Questions
What is the name of the cement that uses an aqueous solution of phosphoric acid buffered by zinc oxide and aluminum oxide as its liquid component?
Zinc phosphate cement
What is the reason why a subliner should be used in deep cavities when using zinc phosphate cement?
To reduce the acidity of the cement
What is the minimum compressive strength required for a luting agent in zinc phosphate cement?
80 MPa
What is the primary reactive component in the powder of zinc phosphate cement?
Zinc oxide
Why should zinc phosphate cement not be used under porcelain teeth?
It is opaque due to high amount of unreacted zinc oxide
What is the recommended P:L ratio for cavity lining with zinc phosphate cement?
3.5:1
What is the primary reason why reinforced material can be used under amalgam?
It has a higher compressive strength
Why is free eugenol not used as a lining with resin-based filling materials?
It interferes with the setting time and causes discoloration
What is a key advantage of calcium hydroxide as a pulp capping material?
It can initiate the formation of secondary dentine
What is a limitation of calcium hydroxide as a restorative material?
It has a low compressive strength
What is a characteristic of polycarboxylate cement?
It is composed of zinc oxides and aluminum oxide in powder form
Why is calcium hydroxide not used as a luting agent?
It has a high solubility
What is the compressive strength range of cement material for this type of filling?
60-220 MPa
How does the filling material initially adhere to tooth substance?
Through the bonding of the free carboxyl group to the hydroxyapetite of enamel and dentine
What is a characteristic of the filling material that makes it suitable for temporary fillings?
Reasonable setting time and has flow after setting
What is the main requirement of temporary filling materials in terms of removal?
Should be easily removed from the cavity
What is the primary indication for using this type of filling material in pedodontic treatment?
For general tooth restoration
What is the type of ZOE that is used as a cavity liner (base)?
Type 4
What is the ultimate compressive strength of glass ionomer cement?
80MPa
Why is polyacrylic acid not used in deep cavities without a subliner?
It has a large molecule and lacks mobility to penetrate dentinal tubules
What is the ratio of powder to liquid in glass ionomer cement?
1.3:1
What is the working time of glass ionomer cement after mixing?
2 minutes
What is the composition of the liquid component of glass ionomer cement?
47% solution of 2:1 polymeric acid and taconic acid in water
What is the correct way to mix glass ionomer cement?
Mixing on paper pad with a stiff spatula
What is the primary purpose of dental cements in dentistry?
To act as a barrier against thermal, electrical, and chemical stimuli
What is a requirement for ideal cement materials?
Compatibility with the filling material
What is a special application of dental cements?
Root canal sealer
What is a type of cement based on phosphoric acid?
Zinc phosphate cement
What is the purpose of luting cements?
To cement crown and bridge restorations
What is a property of ideal cement materials?
Not irritating to the pulp
This quiz covers the basics of dental cements, their properties, and applications. It also explores luting cements used for crown and bridge restorations. Test your knowledge of dental cement materials and their uses in dentistry.
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