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Questions and Answers
What is one of the primary purposes of occlusion blocks?
Which requirement is NOT necessary for a trial denture base?
What is a key function of a tinfoil substitute when constructing a record base?
Why is wax block out used on master casts?
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What thickness should the record base ideally have?
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What is the role of soaking the cast in water during the record base preparation?
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Which of the following methods ensures that the tinfoil substitute is applied correctly?
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What is the hazardous consequence of not relieving undercuts on the trial denture base?
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What is the appropriate width of occlusion rims in the posterior region?
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How should the labial surface of the maxillary occlusion rim in the central area be positioned relative to the incisive papilla?
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What height should the vertical measurement of the mandibular occlusion rim be?
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Which of the following is NOT a use of occlusion rims?
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What is the average width of occlusion rims in the anterior region?
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Where should the height of the posterior lower region occlusion rim be aligned?
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What may patients feel about record bases and occlusion rims?
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What is the distance between the canine line and the posterior end of the occlusion rim used to determine?
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Study Notes
Record Bases and Occlusion Blocks
- Occlusion blocks consist of occlusion rims attached to well-fitting trial denture bases.
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Uses of record bases and occlusion rims:
- Establishing facial contours
- Aid in tooth selection
- Establishing and maintaining the vertical dimension of occlusion during records making
- Making interocclusal records
- Arrangement of denture teeth
- Waxed-up mold for the external surface of the complete denture
Trial Denture Base Requirements
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A trial denture base should be:
- Rigid
- Accurately adapted to the cast with proper extensions
- Dimensionally stable with minimal warpage during use
- Relieved from any undercuts to avoid scraping the cast during insertion and removal
- Clean and smooth for patient comfort
- Proper and uniform thickness (2mm)
- Easy to construct
Wax Block-Out
- Purpose: To protect the master casts, tissue undercuts, and irregularities are blocked out with base plate wax.
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Undercut locations on maxillary casts:
- Labial of the anterior ridge
- Rugae areas
- Sometimes in the tuberosity areas laterally
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Undercut locations on mandibular cast:
- Retromylohyoid areas
Record Base Fabrication
- Master Cast Preparation: The cast is soaked in room temperature water for 5 minutes to help minimize the formation of bubble-like defects in the completed record base.
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Separating Medium: Tinfoil substitute is used as a separating medium to protect the cast and allow for separation of the record base.
- Two thin layers of tinfoil substitute are applied, allowing the first layer to dry prior to adding the second.
- Record Base Material: Autopolymerizing acrylic resin
- Record Base Thickness: Thinner on the crest of the ridges and buccal to the crest of the ridges to allow space for tooth arrangement.
Occlusion Rim Fabrication
- Material: Generally made of pink modeling wax
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Occlusion Rim Uses:
- Registration of jaw relationships
- Choice of artificial teeth:
- Midline is determined
- High and low lip lines are determined to indicate the length of the teeth
- Canine lines determine the width of the teeth.
- Distance between the canine line & the posterior end of the occlusion rim indicates the mesiodistal width of posterior teeth.
- Setting-up of teeth
- Support for lip & cheeks
Occlusion Rim Dimensions
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Width:
- Posterior region: approximately 8–10 mm
- Anterior region: 6–8 mm
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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 a point representing two-thirds the height of the retromolar pad (middle to upper third).
Important Notes
- Patient Communication: Continuously inform patients that the record bases and occlusion rims are not part of the completed dentures and that they may feel a little loose due to the required blocked-out undercuts.
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Description
Test your knowledge on the uses and requirements of record bases and occlusion blocks in complete denture construction. This quiz covers essential aspects like establishing facial contours, tooth selection, and the properties of trial denture bases. Assess your understanding of the techniques and materials involved in creating accurate and comfortable dentures.
