23 Questions
What is the purpose of the de-flasking procedure in complete denture technology?
To liberate the denture with its model
Why is it important to remove the excess acrylic using an acrylic bur during the de-flasking procedure?
To prevent the breakage of the denture
What should be done if there are undercuts present in the model during the de-flasking procedure?
Split the model into two or three parts to remove them easily
Which tool is recommended for separating the two parts of the flask during the de-flasking procedure?
Plaster knife
When should the de-flasking procedure be performed in relation to the curing of acrylic resin?
After curing
What is the purpose of the cold mold seal in the acrylic packing procedure?
To prevent adhesion between teeth and denture base
Why is it crucial to remove all wax residues before proceeding with the acrylic packing procedure?
To avoid contamination of the acrylic resin
What is the purpose of isolating the gypsum in the flasking during the acrylic packing procedure?
To prevent chemical reactions with the acrylic resin
Why should the cold mold seal be thin and even on all parts of the mold except the teeth?
To ensure proper adherence of the teeth to the denture base
What could happen if residual wax is not completely removed before packing with acrylic resin?
The acrylic resin will not set correctly
How does a physical separator differ from a chemical isolator in isolating gypsum during flasking?
A physical separator forms a film of insoluble calcium alginate, while a chemical isolator does not.
What is the purpose of covering the acrylic placed into the mold cavity with cellophane for the trial pack?
To allow excess acrylic to squeeze out around the edges
What is the next step after pressing the flask until excess acrylic squeezes out around the edges?
Trimming away the excess acrylic flash
How should the mold be when the acrylic is pressed smooth and dense?
Full
What is the purpose of cooling the flask slowly on the bench after curing?
To prevent distortion during deflasking
What is a potential downside of using a shorter heating technique during curing?
Likelihood of distortion during deflasking
How should the temperature and time be controlled during the curing process?
Both temperature and time should be controlled
What is the purpose of packing acrylic during the denture making process?
To prevent shrinkage and porosity after polymerization.
What is the consequence of adding acrylic resin too early during the denture making process?
Results in porosity in the final prosthesis.
In which stage of acrylic mixing does the mix become tacky, sticky, and adhere to the sides of the mixing jar?
Stringy or fibrous stage
What happens if acrylic resin is added too late during the denture making process?
Loss of detail and increased vertical dimension of occlusion in final prosthesis
Which component is responsible for initiating the polymerization process in the powder component of the denture material?
Benzoyl peroxide
During which stage of acrylic mixing does further penetration of the monomer into the polymer occur?
Rubber-like stage
Learn about the third stage of making complete dentures, which involves pressing the flask until excess acrylic squeezes out, trimming away acrylic flash, adding acrylic where needed, and closing the upper and lower parts of the flask together. Pay attention to details like wrinkles from cellophane during the process.
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