Questions and Answers
Class 3 RPD's do not have a _____
fulcrum
Class 3 RPD's are completely _____
tooth-borne
In class 3 RPD's _____ are always adjacent to all edentulous spaces
rests
Class 3 RPD's do not need _____ because there is no fulcrum line
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Class _____ RPD's are supported by teeth or dental implants at both ends of an edentulous space
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Class 3 RPD's do not _____ or lift away from the underlying tissues
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Class 3 RPD's are a valuable aid to _____ treatment because of its stabilizing influence on the remaining teeth
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How many clasps are needed in the class 3 RPD shown in the picture?
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What type of clasps are ideal to be used in a class 3 RPD?
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In a class 4 arch the fulcrum line passes through the two _____ adjacent to the single edentulous space
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Forces acting to move the denture base away from the edentulous ridge in a class 4 RPD must be resisted by _____ positioned posterior to the fulcrum line
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Rests (in this case an indirect retainer) should NOT be placed on the _____ side of a tooth
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In class 4 RPD's a _____ configuration of direct retainers is considered ideal
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In a class 4 configuration if the edentulous space is small anterior _____ arms are usually omitted
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In a class 4 configuration indirect retention should be located as far _____ to the fulcrum line as possible
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What Kennedy classification is being described with specific features?
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In general the best treatment to replace missing teeth are _____
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When anterior teeth are lost along with significant amounts of alveolar bone class 4 _____ can restore both teeth and missing gingiva
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Free-standing _____ and anterior teeth cannot resist torquing forces
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_____ teeth tend to rock superior-inferiorly when the distal extension is depressed
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Practice Question #1: Major Connector, Rests, Guide Planes, Retentive Clasps, Reciprocal Clasps, Minor Connector, Indirect Retention?
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Practice Question #2: Major Connector, Rests, Guide Planes, Retentive Clasps, Reciprocal Clasps, Minor Connector, Indirect Retention?
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Study Notes
Kennedy Classification III
- Class 3 RPDs lack a fulcrum, making them stable during function.
- Completely tooth-borne support, relying on remaining teeth or dental implants.
- Rests are positioned adjacent to all edentulous areas to enhance stability.
- Indirect retention is unnecessary due to the absence of a fulcrum line.
- Supported by teeth or dental implants at each end of the edentulous space.
- Do not rotate or detach from underlying tissues, eliminating the need for rotational force compensation.
- Serve as important aids in periodontal treatment, providing stability to existing teeth.
- Ideal clasps can be circumferential; any clasps are applicable since there is no axis of rotation.
Kennedy Classification IV
- The fulcrum line in Class 4 RPDs passes through two abutments adjacent to a single edentulous space.
- Forces that attempt to displace the denture base must be counteracted by indirect retainers positioned behind the fulcrum line.
- Indirect retainers (like rests) should not be placed on the mesial side of a tooth to ensure proper engagement.
- An ideal configuration of direct retainers is a quadrilateral shape, promoting balance and support.
- In configurations with small anterior edentulous spaces, retentive arms may be omitted to improve esthetics and function.
- Indirect retention should be located as posterior to the fulcrum line as feasible for maximum effectiveness.
- Class 4 characteristics include distal occlusal rests that function as indirect retainers and circumferential clasps engaging mesial undercuts.
General Treatment Options
- Fixed partial dentures are considered the best solution for replacing missing teeth due to their stability and functionality.
- When significant alveolar bone loss occurs alongside anterior tooth loss, Class 4 removable partial dentures can restore both teeth and supporting gingiva.
- Free-standing premolars and anterior teeth are inadequate in resisting torquing forces which may affect denture stability.
- Anterior teeth tend to experience superior-inferior rocking motion when the distal extension area is depressed.
Practice Questions
- Considerations for designing RPDs include identifying major connectors, rests, guide planes, retentive and reciprocal clasps, minor connectors, and indirect retention strategies.
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Description
Test your knowledge on Kennedy Classification, focusing on Class III and IV removable partial dentures (RPDs). This quiz covers aspects such as stability, retention, and support in relation to tooth and implant integration. Enhance your understanding of these classifications and their applications in dental treatment.
