39 Questions
What is the purpose of provisional cements?
To provide a good seal and prevent pulpal irritation
What is the main reason for using Tempbond Clear – Provilink (resin based-dual cure) provisional cement?
Easy removal from provisional and tooth
What is the purpose of an obtundent in provisional cementation?
Diminishes pain perception and/or touch
What is the setting time of Tempbond/Tempbond NE?
3-4 mins
What is the effect of residual eugenol in provisional cementation?
Inhibits the polymerization of resin materials
What is the main reason for using polycarboxylate provisional cement?
Easy clean up
What is the purpose of using zinc oxide-based provisional cements?
To provide a good seal and prevent pulpal irritation
What is the main reason for using Tempbond VS. Tempbond NE?
Residual eugenol may inhibit the polymerization of resin materials
What is the main reason for using resin-based provisional cements?
Dual cure
What is the main reason for considering radiopacity when selecting luting agent?
Able to differentiate between a cement line or recurrent caries
What type of adhesion involves the sharing of electrons between two atoms?
Chemical adhesion
Which type of adhesion is rapid, reversible, and not suitable for a permanent bond?
Physical adhesion
What is the role of a coupling agent in adhesion?
To modify surface characteristics of one of the materials involved
What does a primer do in the context of adhesion?
Modifies surface characteristics of one of the two materials involved
What is the function of a lung agent in dental restorations?
To fill the gap between the tooth and the indirect restoration to hold them together
What type of adhesion results from the presence of surface irregularities?
Mechanical adhesion
Which combination results in good adhesion according to the text?
Liquid + Solid
What distinguishes chemical adhesion from physical adhesion?
Sharing of electrons in the bond
What is the function of a working time in dental materials?
Period for manipulating the dental material without adverse effects
What is the purpose of the sprue in the casting process?
To enable the molten metal to flow into the mold with minimal turbulence
What is the function of the crucible former in the casting process?
To provide a base for the casting ring during investing
What is the role of the investment expansion in the casting process?
To create additional space for gas escape during casting
What is the recommended location for attaching the sprue to the wax pattern?
To the bulkiest, non-critical area
What is the purpose of the liner in the casting ring?
To allow for more expansion of the investment material
What is the primary function of the wax elimination process?
To eliminate the wax from the mold
What is the influence of the compressibility of the ring liner on setting expansion?
Higher compressibility increases setting expansion
What is the effect of the water/powder ratio on setting expansion?
Less water increases expansion
What is the purpose of the investment expansion in the casting process?
To create additional space for gas escape during casting
What is the primary consideration for selecting the type of casting alloy?
Clinical performance
What is the purpose of the sprue in the lost wax technique?
To introduce molten metal into the mold
Which investment material is suitable for high gold or palladium content alloys?
Phosphate bonded
What is the main reason for using silica bonded investment material?
It is stable at high temperatures
What is the purpose of phosphate ion in phosphate bonded investment material?
To add additional expansion over gypsum investment
Why is gypsum bonded investment material not suitable for casting metal ceramic alloys?
It is not stable above 650°C
What is the shrinkage percentage for nickel-chromium alloys upon solidification?
2.4%
What is the role of the investment material in the lost wax technique?
To compensate for the solidification shrinkage of the alloy
What is the function of a centrifuge in the lost wax technique?
To perform the casting of the molten metal
What is the primary requirement for investment materials used in the lost wax technique?
To reproduce precisely the detailed form of the wax pattern
Why is phosphate bonded investment material considered difficult to remove?
It is water soluble and forms nodules on casting
Test your knowledge of adhesion forces and types with this quiz. Explore how different materials bond together and the factors affecting their adhesion. Learn about mechanical, physical, and chemical types of adhesion in this insightful quiz.
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