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WorksheetsAcrylic Resin Quiz
Total questions: 19
Worksheet time: 10mins
Which is the common method used to polymerise acrylic resin for dental appliances?
UV light curing
Heat curing
Cold curing
Microwave curing
Pressure curing
How can you prevent staining on acrylic resin dentures?
Avoiding foods and drinks that cause discoloration
Brushing the denture regularly
Soaking the denture in cleaner overnight
Soaking the denture in plain water overnight
Coating with a protective varnish
To minimise dimensional changes what do manufactures do:
Change the powder liquid ratio
Add inhibitor to the liquid
Prepolymerise the denture base materials
Decrease the amount of cross linking agent
Avoid adding the initiator in the powder
The fundamental difference between heat activated resin and chemically activated resin is:
Difference in temperature
Difference in powder liquid ratio
Production of free radicals by benzoyl peroxide
Presence of chemical activators
They don’t have any significant difference
What can cause crazing in acrylic resin denture?
High polymerization temperature
High polymerization pressure
Low polymerization pressure
Repeated stress application
Improper polymer monomer mixing
The creep rate of denture base resin can be elevated by:
Increase in temperature
Increase in applied load
Presence of plasticizer
Both A&B
All of the above
How does presence of residual monomer affect the properties of cured acrylic resin:
It causes porosity
It makes the material prone to breakage
It increases the likelihood of allergic reactions
It makes the resin rigid
It alters the working time of resin
Chemically activated resins have decreased strength as compared to heat activated resins because of:
Production of free radicals
Lower degree of polymerization
Presence of chemical activator
More chances of developing porosity
High pressure required for polymerization
The importance of thoroughly mixing of the powder and liquid when preparing acrylic resin is to:
Reduce the polymerization time
Prevent porosity and air entrapment
Increase the working time
Ensure uniform polymer chain length
Provide adequate strength
Which stage defines the working time of a denture base material:
Sandy
Stingy
Doughy
Rubbery/Elastic
Rigid
What is the major disadvantage of acrylic resin denture?
They are too lightweight
They are prone to breakage if dropped
They cause allergic reactions in all old patients
They cannot be customized for individual patients
They are not easily available
What are the main components of acrylic resin used in dental appliance?
Polyethylene and silicon
Polymethyl methacrylate(PMMA) and monomer
Methymethacrylate(MMA) and monomer
Bisphenol A and Epoxy resin
Epoxy resin and hardener
Why is hydroquinone added in liquid in heat activated denture base resins:
It acts as a initiator which is responsible for starting the polymerization reaction
It acts as a cross linking agent
It acts as an inhibitor which prevents undesirable polymerization or setting of liquid during storage
It is present in the powder and not the liquid
Both A&B
If curing is done at temperature more than 100 degree celcius porosity results in which area of denture:
Hard Thick central area
Thin palatal area
Thin area of flanges
Porosity is uniformly distributed
Porosities are not formed at high temperatures
What additive is often used in acrylic resin to improve the materials dimensional stability and reduce shrinkage:
Benzoyl peroxide
Methylmethacrylate
Hydroquinone
Ethylene glycol dimethacrylate
Plasticizers
During the polymerization of methyl methacrylate to form polymethyl methacrylate. How much volumetric shrinkage occurs:
13%
5%
25%
21%
19%
Which property of acrylic resin is crucial for its use in denture bases?
Ease of use
Biocompatiability
Inexpensive
High thermal conductivity
Transperancy
A 71 year old edentulous man developed a painful red mouth at sites of contact with a new denture. What could be the possible cause:
Burns due to low thermal conductivity of acrylic
Burns due to High thermal conductivity of acrylic resin
The denture is ill fitting
The patient is allergic to acrylic resin
Can be cause by some systemic disease
What is the cause of porosity in the picture B&C
Rapid Heating
Insignificant mixing of monomer and polymer
Insufficient pressure during polymerization
Properly polymerized
Inadequate polymer to monomer ration
