Questions and Answers
In reference to the partially edentulous arch and accompanying framework shown, what is the Kennedy classification?
What do you think is the most likely cause for the tissue damage that has occurred on tooth #22?
What should be the relationship of the superior border of the plating and the survey line?
If an anterior-posterior strap design is to be considered, the opening between the anterior and posterior palatal straps should be at least which of the following?
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Because there are no movable tissues on the palate, the borders of maxillary major connectors may be located farther from the gingival margins than those of mandibular major connectors.
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Which one of the following statements regarding the clasping on the mandibular class III framework is TRUE?
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On the RPD framework shown, the rests on teeth numbers 20 and 28 are indirect retainers and function when the patient bites down on the distal extension area.
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Guide surface preparations should be completed before rest seat preparations.
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In the class II mandibular RPD shown to the right, the clasp on tooth #27 should be wrought wire BECAUSE the cingulum rest acts like a distal rest and the tip of the retentive arm is in front of the axis of rotation.
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When tripoding a cast, the vertical arm of the surveyor must be locked in position.
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A wrought wire circumferential clasp could be used on tooth #6. Which of the following statements is correct?
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The statement and the reason are true AND related.
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Study Notes
Kennedy Classification and RPD Characteristics
- Class I, Modification 0 is indicated for a bilateral distal extension in the Kennedy classification system.
- RPDs (Removable Partial Dentures) can have different classes based on edentulous areas and modifications.
- Some RPDs do not possess an axis of rotation, affecting their stability and design.
Tissue Damage on Tooth #22
- Possible causes of tissue damage on tooth #22 include:
- Inadequate tooth plating leading to pressure and tissue breakdown.
- Poor oral hygiene, resulting in pocket formation and subsequent tissue damage.
- Absence of necessary rest preparation on tooth #22.
- Use of an inappropriate clasp design.
Relation of Plating to Survey Line
- The superior border of plating should be positioned exactly at the survey line to maintain proper fit and function.
- Lingual tori necessitate the use of linguoplating in specific areas, influencing RPD design.
Maxillary Class III RPD Connectors
- A minimum distance of 15 mm should be maintained between the anterior and posterior palatal straps in an anterior-posterior palatal strap major connector design.
Major Connector Placement
- In maxillary RPDs, connectors can be placed farther from gingival margins due to the absence of movable tissue in the palate.
Clasp Design in Mandibular Class III
- Lingual arms on molars are generally used as retentive arms due to facial undercuts being often unavailable.
- Circumferential clasping should be adjusted for undercuts on teeth, such as changing to I-bars based on the location of the undercut.
Rest Functionality
- Rests on distal extension frameworks, such as on teeth #20 and #28, do not function as indirect retainers when biting down.
Guide Surface Preparations
- It is critical to complete guide surface preparations prior to rest seat preparations to ensure accurate fit.
Clasp Design for Class II Mandibular RPD
- A wrought wire clasp on tooth #27 is appropriate due to the function of the cingulum rest acting as a distal rest.
Tripoding Procedure
- Locking the vertical arm of the surveyor is essential when tripoding a cast for accurate positioning.
RPD Clasp Suitability
- A wrought wire circumferential clasp may be suitable for tooth #6, but in some cases, it may be unnecessary, highlighting the variability of clasp designs based on specific conditions.
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Description
This quiz covers essential concepts related to Removable Partial Dentures (RPDs), including the Kennedy classification and its characteristics, as well as tissue damage associated with specific teeth. It also examines the relationship between plating and survey lines, including special considerations for maxillary Class III connectors.
