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Dental Polymers/Denture Base Resins Exam Questions and Answers

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Dental Polymers/Denture Base Resins Exam Questions and Answers Which of the following is true regarding addition polymerization? a. It occurs in three stages: initiation, margination, and condensation. b. Monomers have a core of two silicon atoms joined by a double bond. c. One carbon atom ...

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  • November 10, 2024
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Dental Polymers/Denture Base Resins

Exam Questions and Answers


Which of the following is true regarding addition polymerization?


a.


It occurs in three stages: initiation, margination, and condensation.


b.


Monomers have a core of two silicon atoms joined by a double bond.


c.


One carbon atom has two hydrogen atoms attached, and the other carbon atom has attached to it one

hydrogen atom and one reactive group called a free radical.


d.


The reaction produces by-products such as water, hydrogen gas, or alcohol that may compromise the

physical properties or handling characteristics. - ANSWER✔✔-ANS: C


One carbon atom has two hydrogen atoms attached, and the other carbon atom has attached to it one

hydrogen atom and one reactive group called a free radical. Addition polymerization occurs in three

stages: initiation, propagation, and termination. Monomers have a core unit of two carbon atoms joined

by a double bond. The condensation polymerization reaction produces by-products such as water,

hydrogen gas, or alcohol that may compromise the physical properties or handling characteristics.



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In an addition polymerization reaction, the free radical initiates the reaction by:


a.


opening the bond between the two carbon atoms of the monomer


b.


creating a bend in the carbon atom


c.


excluding divalent cations


d.


reversing the polarity of the monomer chain - ANSWER✔✔-ANS: A


In an addition polymerization reaction, the free radical initiates the reaction by opening the bond

between the two carbon atoms of the monomer. The broken bond causes the monomer molecule to

bond to another monomer. Each linkage leaves a free radical available for further reaction.


The monomer will _____________ if the temperature becomes too great during the polymerization

process.


a.


cause crazing of the material


b.


vaporize and produce porosity


c.



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bleach the denture white


d.


warp the prosthesis - ANSWER✔✔-ANS: B


The monomer will vaporize and produce porosity if the temperature becomes too great during the

polymerization process. Porosity weakens the material, causes it to discolor as stains are absorbed into

the pores, and can lead to retention and growth of oral microorganisms.


The polymerized acrylic resin formed when a liquid monomer is mixed with a powder of small polymer

beads is:


a.


bis-GMA


b.


benzoyl peroxide


c.


poly (ethyl methacrylate)


d.


poly (methyl methacrylate) - ANSWER✔✔-ANS: D


The polymerized acrylic resin formed when a liquid monomer is mixed with a powder of small polymer

beads is poly (methyl methacrylate). It is composed of numerous methyl methacrylate (MMA) monomer

units linked together to form a long-chain polymer.


Which of the following is true regarding the properties of acrylic resins used in dentistry?

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