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Questions and Answers
What is the purpose of marking the anticipated final extensions of the denture with a red pencil on the cast?
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 (correct)
- To identify areas for trimming the excess material from the denture
- To mark areas for creating undercuts in the denture
- To highlight areas for applying separating media
What is the purpose of blocking out undercuts with modeling wax?
What is the purpose of blocking out undercuts with modeling wax?
- To prevent breakage of the cast or tray during impression making
- To create space for impression material in areas with undercuts (correct)
- To reduce the need for applying separating media
- To improve the stability of the final denture
What is the purpose of applying separating media on the cast?
What is the purpose of applying separating media on the cast?
- To improve the bond between acrylic resin and the cast
- To enhance the detail captured in the impression
- To prevent distortion of the mucosa during impression making (correct)
- To minimize pressure on the tray during impression making
What is the function of finger rests during impression making?
What is the function of finger rests during impression making?
Why should tray periphery be 2-3 mm thick and have rounded edges?
Why should tray periphery be 2-3 mm thick and have rounded edges?
What is the role of spacer during impression making?
What is the role of spacer during impression making?
What is the purpose of border molding in dental impressions?
What is the purpose of border molding in dental impressions?
Which materials are used for final impressions in dentistry?
Which materials are used for final impressions in dentistry?
What is a definitive cast in dentistry?
What is a definitive cast in dentistry?
What method is used for making preliminary casts in dentistry?
What method is used for making preliminary casts in dentistry?
What is the purpose of the wax boxing method in dentistry?
What is the purpose of the wax boxing method in dentistry?
What materials are used for maxillary impressions in dentistry?
What materials are used for maxillary impressions in dentistry?
What is the last step in fabricating master casts for full dentures?
What is the last step in fabricating master casts for full dentures?
What is involved in pouring the cast in dentistry?
What is involved in pouring the cast in dentistry?
What is done during retrieving the cast in dentistry?
What is done during retrieving the cast in dentistry?
What is involved in trimming the cast for full dentures?
What is involved in trimming the cast for full dentures?
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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.
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