16 Questions
What is the purpose of marking the anticipated final extensions of the denture with a red pencil on the cast?
To indicate where the denture will be extended to ensure proper fit and function
What is the purpose of blocking out undercuts with modeling wax?
To create space for impression material in areas with undercuts
What is the purpose of applying separating media on the cast?
To prevent distortion of the mucosa during impression making
What is the function of finger rests during impression making?
To assist in holding the tray in position while making the final impression
Why should tray periphery be 2-3 mm thick and have rounded edges?
To minimize tissue distortion and ensure patient comfort during impression making
What is the role of spacer during impression making?
To create space for impression material in areas with undercuts
What is the purpose of border molding in dental impressions?
Shaping the border areas of dental impressions using a low fusing compound and manual or functional manipulation of adjacent soft tissue
Which materials are used for final impressions in dentistry?
Zinc Oxide Eugenol Impression Paste and Elastomeric Impression Materials
What is a definitive cast in dentistry?
A replica of residual ridge areas or other parts of the dental arch used to fabricate a prosthesis
What method is used for making preliminary casts in dentistry?
Inversion Method
What is the purpose of the wax boxing method in dentistry?
Creating a container for the impression using wax and plaster or pumice
What materials are used for maxillary impressions in dentistry?
Wax, beading wax, plaster, and pumice
What is the last step in fabricating master casts for full dentures?
Trimming the Cast: flattening the base, trimming the sides, and reducing the depth of the peripheral roll
What is involved in pouring the cast in dentistry?
Preparing a mixture of yellow stone and carefully pouring it into the impression
What is done during retrieving the cast in dentistry?
Separating the cast from the impression after heating it in a water bath
What is involved in trimming the cast for full dentures?
Flattening the base, trimming the sides, and reducing the depth of the peripheral roll
Study Notes
- Border Molding: shaping the border areas of dental impressions using a low fusing compound and manual or functional manipulation of adjacent soft tissue
- Materials Used for Border Molding: low fusing compound with putty consistency
- Final Impression: representation of the completed registration of a dental surface or object, also called master impression
- Materials Used for Final Impression: Zinc Oxide Eugenol Impression Paste and Elastomeric Impression Materials
- Definitive Cast: replica of residual ridge areas or other parts of the dental arch used to fabricate a prosthesis
- Making Final Casts: methods include Alpha hemihydrate (dental stone), Inversion Method (for preliminary casts), and Beading and boxing method (for master casts)
- Wax boxing Method: creating a container for the impression using wax and plaster or pumice
- Maxillary Impression: applying wax, creating lands using beading wax or plaster and pumice, and pouring yellow stone into the impression
- Mandibular Impression: applying rubber base adhesive or hot sticky wax, creating lands using red beading wax or plaster and pumice, and pouring yellow stone into the impression
- Pouring the Cast: preparing a mixture of yellow stone and carefully pouring it into the impression
- Retrieving the Cast: separating the cast from the impression after heating it in a water bath
- Trimming the Cast: flattening the base, trimming the sides, and reducing the depth of the peripheral roll
- Completed Master Cast: proper trimming and land dimensions, including depth of peripheral roll and thickness of the base
- Videos: resources for learning border molding, wax boxing, and fabricating master casts for full dentures.
Test your knowledge about impression and boxing techniques in prosthetic dentistry with this quiz. Learn about marking the anticipated final extensions of the denture, tray extension, and other important steps in the process.
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