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Questions and Answers
What is the approximate width of occlusal rims in the anterior region?
What is the primary purpose of occlusion rims?
Where should the labial surface of the maxillary occlusion rim be positioned in relation to the incisive papilla?
What height should the anterior portion of the mandibular occlusion rim be approximately?
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What aspect should be continuously communicated to patients regarding record bases and occlusion rims?
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What is the approximate width of posterior occlusion rims?
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Which line on the occlusion rim helps to determine the width of the artificial teeth?
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What is the height of the posterior lower region of the mandibular occlusion rim related to?
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What is the primary purpose of using occlusion blocks?
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Which requirement for a trial denture base ensures that it does not distort over time?
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What is the purpose of waxing out undercuts on the master casts?
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How long should the cast be soaked in room temperature water before making the record base?
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Why is a tinfoil substitute used in the process of making the record base?
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What is the ideal thickness of the trial denture base required?
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What component is essential for making interocclusal records?
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Which of the following statements about the construction of the record base is correct?
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Study Notes
Record Bases and Occlusion Blocks
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Definition: Occlusion blocks are composed of occlusion rims attached to well-fitting trial denture bases.
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Purpose:
- Establishing facial contours
- Assisting in tooth selection
- Maintaining the vertical dimension of occlusion during record taking
- Making interocclusal records
- Arranging denture teeth
- Creating a waxed-up mold for the external surface of the complete denture
Requirements of a Trial Denture Base
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Characteristics:
- Rigid
- Accurately adapted to the cast with proper extensions
- Dimensionally stable with minimal warpage
- Relieved from undercuts to avoid scraping the cast
- Clean and smooth for patient comfort
- Proper and uniform thickness (2mm)
- Easy to construct
Wax Blockout
- Purpose: To protect master casts from tissue undercuts and irregularities.
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Locations:
- Maxillary casts: Labial of the anterior ridge, rugae areas, sometimes in tuberosity areas laterally.
- Mandibular cast: Retromylohyoid areas.
Record Base Fabrication
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Master Cast Preparation:
- The cast is soaked in room temperature water for 5 minutes to expel air and minimize bubble-like defects.
- A tinfoil substitute is used as a separating medium to protect the cast and ensure separation of the record base.
- The tinfoil substitute is applied in two thin layers, allowing the first layer to dry before applying the second.
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Record Base Material:
- Fabricated with autopolymerizing acrylic resin.
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Thickness:
- Thinner on the crest of the ridges and buccal to the crest of the ridges due to limited space for tooth arrangement.
Occlusion Rims
- Material: Generally made of pink modeling wax.
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Uses:
- Registration of jaw relationships
- Tooth selection:
- Midline determination
- High and low lip line determination for tooth length
- Canine line determination for tooth width
- Distance between the canine line and posterior end of the occlusion rim for posterior tooth width
- Setting up teeth
- Support for lips and cheeks
Occlusion Rim Dimensions
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Width:
- Approximately 8–10 mm in the posterior region
- 6–8 mm in the anterior region
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Maxillary Occlusion Rim:
- Labial surface in the central area is approximately 6-8 mm anterior to the middle of the incisive papilla and is inclined labially.
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Mandibular Occlusion Rim:
- Vertical height is about 18mm.
- Posterior lower region height is equal to two-thirds the height of the retromolar pad (middle to upper third).
Important Considerations
- Patient Communication: Continuously inform patients that the record bases and occlusion rims are not permanent parts of the dentures and may feel loose due to blocked-out undercuts.
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Description
This quiz explores the essential features and purposes of occlusion blocks and trial denture bases in prosthodontics. It covers the characteristics required for trial denture bases and the importance of wax blockout in protecting master casts. Test your understanding of these fundamental concepts in denture construction.