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1.What is the most commonly used technique and materials for immediate denture impression?
- Rubber-base Material: 2 mm
- Border mold and finish with rubber base material
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Custom tray reqs
- 2-3mm short of vestibules to allow proper border molding
- Cover the retromolar pads & tuberosities
- Provide extra clearance for any frenum
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2. What is the alternative impression technique then? When do you need to use the alternative technique?
- Alginate & Stock Tray
- 3-4mm space
- Only when considerable tooth misalignment,
- gross bony undercuts or/and great teeth mobility are present
- 2-stage extraction
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3. Describe the differences in making custom trays for rubber-base and alginate materials?
- wax spacer around teeth according to your selected impression material:
- Rubber-base Material: 2 mm
- Alginate: minimum 3-4 mm
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4. What are precautions in making and handling master impression using the alginate material, instead of rubber-base material.
- necessity of border molding: areas of the tray that are too short require border molding
- Requires more vigorous border movements of tissues during alginate setting to avoid an overextended impression
- Must be poured immediately
- Two-stage pour technique for a master cast to establish proper vestibular reflection and land
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disadvantages of alginate impression technique
- compromised retention
- potential periphery sores caused by the likelihood of overextended impression
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Best material option is determined during the _____ appointment and can be reaffirmed with removable consults.
preliminary impression
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5. What are the requirements for record base for jaw relation?
- Large edentulous area(s)
- Distorted or instable occlusion
- 3rd APPT
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6. When the existing occlusion deemed unacceptable and new VDO deemed necessary to establish, how do you determine the new VDO? List criterions or principles.
- Remaining teeth position, mobility and facial appearance (2 stage necessary?)
- status of existing RPDs
- free way space
- Determine the VDO
- Confirm the VDO with the closest speaking space during sibilant sounds
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Extend the record base and make contact with the _______ surfaces of the teeth to obtain retention and stability
proximal and lingual
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Free way space
(VDR-VDO: Interocclusal Space) is 2-4 mm
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Closest Speaking Space
- s, ch, and z are sounds
- interocclusal space minimum without teeth coming
- into contact
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7. Based on what jaw position the new horizontal position can be determined ?
- Centric Occlusion: existing occlusion. Usually this coincide with habitual closing position or muscle position (tapping position).
- If the Pt. presents unreliable, or physiologically unacceptable jaw position, follow the principle of complete dentures (CR position).
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Jaw relation steps
- 1. Face bow record
- 2. Evaluate and determine VDO
- 3. Take horizontal record
- 4. Take protrusive record
- 5. Mark and transfer the posterior palatal seal.
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9. What are surgical options to address anatomical conditions potentially interfere with the design of immediate dentures and impair their retention and stability?
- Removal of boney undercuts
- Removal of maxillary and mandibular tori
- Tuberosity reduction
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8.What anatomical conditions potentially interfere with the design of immediate dentures and impair their retention and stability.
- Bilateral boney undercuts
- Enlarged tuberosities or supererrupted alveolar bone may create a problem in inter-arch space for denture teeth set-up.
- Significantly developed exostoses and tori interfere with the extension and adaption of dentures
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10. How do you identify these problems and plan the surgery. How do you ensure the execution of the planned surgery.
- Obtain an approval also from a surgeon during surgical consultation.
- approved surgical plan is simulated on the master cast by reducing the areas during setting up teeth. This simulation will be conveyed precisely to the surgeon via a surgical stent.
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