Adhesion Forces Quiz

What is the purpose of provisional cements?

To differentiate between a cement line or recurrent caries
To provide a good seal and prevent pulpal irritation (correct)
To release fluoride and have low solubility
To adhere well to tooth structure and indirect restoration

What is the main reason for using Tempbond Clear – Provilink (resin based-dual cure) provisional cement?

Easy removal from provisional and tooth (correct)
Low viscosity
High thermal conductivity
Biocompatibility

What is the purpose of an obtundent in provisional cementation?

Produces a thin layer and has low film thickness
Provides good tensile & shear strength
Affects the ability to seat restoration
Diminishes pain perception and/or touch (correct)

What is the setting time of Tempbond/Tempbond NE?

3-4 mins (C) Signup and view all the answers

What is the effect of residual eugenol in provisional cementation?

Inhibits the polymerization of resin materials (D) Signup and view all the answers

What is the main reason for using polycarboxylate provisional cement?

Easy clean up (A) Signup and view all the answers

What is the purpose of using zinc oxide-based provisional cements?

To provide a good seal and prevent pulpal irritation (D) Signup and view all the answers

What is the main reason for using Tempbond VS. Tempbond NE?

Residual eugenol may inhibit the polymerization of resin materials (B) Signup and view all the answers

What is the main reason for using resin-based provisional cements?

Dual cure (D) Signup and view all the answers

What is the main reason for considering radiopacity when selecting luting agent?

Able to differentiate between a cement line or recurrent caries (C) Signup and view all the answers

What type of adhesion involves the sharing of electrons between two atoms?

Chemical adhesion (A) Signup and view all the answers

Which type of adhesion is rapid, reversible, and not suitable for a permanent bond?

Physical adhesion (D) Signup and view all the answers

What is the role of a coupling agent in adhesion?

To modify surface characteristics of one of the materials involved (D) Signup and view all the answers

What does a primer do in the context of adhesion?

Modifies surface characteristics of one of the two materials involved (B) Signup and view all the answers

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 (B) Signup and view all the answers

What type of adhesion results from the presence of surface irregularities?

Mechanical adhesion (C) Signup and view all the answers

Which combination results in good adhesion according to the text?

Liquid + Solid (B) Signup and view all the answers

What distinguishes chemical adhesion from physical adhesion?

Sharing of electrons in the bond (D) Signup and view all the answers

What is the function of a working time in dental materials?

Period for manipulating the dental material without adverse effects (C) Signup and view all the answers

What is the purpose of the sprue in the casting process?

To enable the molten metal to flow into the mold with minimal turbulence (D) Signup and view all the answers

What is the function of the crucible former in the casting process?

To provide a base for the casting ring during investing (D) Signup and view all the answers

What is the role of the investment expansion in the casting process?

To create additional space for gas escape during casting (B) Signup and view all the answers

What is the recommended location for attaching the sprue to the wax pattern?

To the bulkiest, non-critical area (A) Signup and view all the answers

What is the purpose of the liner in the casting ring?

To allow for more expansion of the investment material (A) Signup and view all the answers

What is the primary function of the wax elimination process?

To eliminate the wax from the mold (D) Signup and view all the answers

What is the influence of the compressibility of the ring liner on setting expansion?

Higher compressibility increases setting expansion (B) Signup and view all the answers

What is the effect of the water/powder ratio on setting expansion?

Less water increases expansion (B) Signup and view all the answers

What is the purpose of the investment expansion in the casting process?

To create additional space for gas escape during casting (B) Signup and view all the answers

What is the primary consideration for selecting the type of casting alloy?

Clinical performance (D) Signup and view all the answers

What is the purpose of the sprue in the lost wax technique?

To introduce molten metal into the mold (C) Signup and view all the answers

Which investment material is suitable for high gold or palladium content alloys?

Phosphate bonded (A) Signup and view all the answers

What is the main reason for using silica bonded investment material?

It is stable at high temperatures (B) Signup and view all the answers

What is the purpose of phosphate ion in phosphate bonded investment material?

To add additional expansion over gypsum investment (B) Signup and view all the answers

Why is gypsum bonded investment material not suitable for casting metal ceramic alloys?

It is not stable above 650°C (B) Signup and view all the answers

What is the shrinkage percentage for nickel-chromium alloys upon solidification?

2.4% (B) Signup and view all the answers

What is the role of the investment material in the lost wax technique?

To compensate for the solidification shrinkage of the alloy (D) Signup and view all the answers

What is the function of a centrifuge in the lost wax technique?

To perform the casting of the molten metal (D) Signup and view all the answers

What is the primary requirement for investment materials used in the lost wax technique?

To reproduce precisely the detailed form of the wax pattern (B) Signup and view all the answers

Why is phosphate bonded investment material considered difficult to remove?

It is water soluble and forms nodules on casting (C) Signup and view all the answers