Podcast
Questions and Answers
What is the main purpose of leaving wax slightly extended in the posterior palate and retromolar pad areas during tray fabrication?
What is the main purpose of leaving wax slightly extended in the posterior palate and retromolar pad areas during tray fabrication?
- To ensure the wax adheres better to the dental cast
- To enable recording of the posterior palatal area and retromolar pad (correct)
- To make the tray easier to remove from the dental cast
- To reduce the overall material needed for fabrication
Which of the following statements is true about wax placement according to Boucher's recommendation?
Which of the following statements is true about wax placement according to Boucher's recommendation?
- The wax should cover all areas of the dental cast evenly
- Only the posterior palatal area does not require wax
- A 2 mm layer of base plate wax is recommended on the dental cast
- A 1 mm layer of base plate wax is recommended, except for the PPS area (correct)
In the context of dental tray fabrication, what does PPS stand for?
In the context of dental tray fabrication, what does PPS stand for?
- Palpation Positioning Surface
- Posterior Plate Section
- Palatal Positioning Seal
- Posterior Palatal Seal (correct)
What is the significance of trimming the wax to the outline during dental tray fabrication?
What is the significance of trimming the wax to the outline during dental tray fabrication?
Which area is explicitly mentioned as not requiring wax application during the fabrication of a dental tray?
Which area is explicitly mentioned as not requiring wax application during the fabrication of a dental tray?
What is the primary function of impression trays during the setting and removal process?
What is the primary function of impression trays during the setting and removal process?
Which step is NOT involved in the creation of a custom tray?
Which step is NOT involved in the creation of a custom tray?
Which of the following materials is NOT typically used for making a special tray?
Which of the following materials is NOT typically used for making a special tray?
What step comes immediately after placing the wax spacer on the cast during custom tray fabrication?
What step comes immediately after placing the wax spacer on the cast during custom tray fabrication?
In which type of curing is the material hardened by chemical reactions among components?
In which type of curing is the material hardened by chemical reactions among components?
What is the primary purpose of trimming the wax after application to the maxillary cast?
What is the primary purpose of trimming the wax after application to the maxillary cast?
During the wax spacer application, what is the correct temperature method for softening the wax?
During the wax spacer application, what is the correct temperature method for softening the wax?
What specific adjustment is made to the thickness of baseplate wax during the trimming process?
What specific adjustment is made to the thickness of baseplate wax during the trimming process?
What is the necessary action taken after the wax is firmly applied to the maxillary cast?
What is the necessary action taken after the wax is firmly applied to the maxillary cast?
What is the recommended quantity of wax layers to apply during the initial step?
What is the recommended quantity of wax layers to apply during the initial step?
What is the primary purpose of an impression in dentistry?
What is the primary purpose of an impression in dentistry?
Which of the following is NOT a step in complete denture construction?
Which of the following is NOT a step in complete denture construction?
What role do impression materials play in dentistry?
What role do impression materials play in dentistry?
At which stage in complete denture construction is the maxillo-mandibular relationship established?
At which stage in complete denture construction is the maxillo-mandibular relationship established?
Which of the following best describes the secondary impression?
Which of the following best describes the secondary impression?
What is the first area where the Triad material should be pressed when creating a tray?
What is the first area where the Triad material should be pressed when creating a tray?
What angle should the tray handle be molded relative to the crest of the ridge?
What angle should the tray handle be molded relative to the crest of the ridge?
How long should the tray be cured in the curing unit after being removed from the cast?
How long should the tray be cured in the curing unit after being removed from the cast?
Where should the handle of the tray begin when molded?
Where should the handle of the tray begin when molded?
Which side of the tray should face up during the second curing phase in the curing unit?
Which side of the tray should face up during the second curing phase in the curing unit?
Study Notes
Impression Tray Fabrication
- Impression trays are used to prevent distortion of the material while setting and being removed from the mouth.
- Custom trays are made by outlining the cast, blocking out undercuts, placing a wax spacer, and then molding Triad material.
- The Triad tray is then cured in an oven and trimmed for final use.
- Cold cure, Visible light cure (VLC), and Heat cure acrylic are the most common materials for custom trays.
Wax Spacer Placement
- Boucher recommends placing a 1 mm layer of baseplate wax on the dental cast, excluding the posterior palatal seal (PPS) area.
- When trimming the wax, leave it slightly extended in the retromolar pad and posterior palate.
Triad Tray Procedure
- A single layer of Triad tray material is placed on the wax cast, pressing into the lingual (mandibular) or palatal (maxillary) area first to prevent air pockets.
- The material is then firmly pressed over the ridge and buccal areas.
- A handle is molded onto the tray, starting at the crest of the ridge on the anterior portion and angled at 45 degrees, long enough to accommodate the thumb.
- The tray is cured on the cast for 3 minutes and then placed waxed side up in the curing unit for 2 minutes.
Complete Denture Construction Steps
- History and examination
- Primary impression
- Secondary impression
- Maxillo-mandibular relationship
- Try-in stage
- Denture insertion
- Recall visits
Impression
- An impression is a negative reproduction of dental structures.
- Impression materials are used to obtain an impression of teeth and/or the surrounding oral tissues.
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Description
This quiz covers the methods and materials used for fabricating impression trays in dentistry. Topics include the fabrication process, wax spacer placement, and the use of Triad material. Test your knowledge on custom tray techniques and impressions!
