Questions and Answers
Which type of undercut is desirable for denture retention?
All undercuts are considered undesirable except for those used for denture retention.
True
What is the direction called where a restoration moves from its initial contact until it is fully seated?
Path of Insertion
The direction of movement of the restoration from its resting position is called the __________.
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Match the following components with their descriptions:
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Which factor does NOT affect the path of insertion?
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Guiding planes only apply to the lingual surfaces of teeth.
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What should the location of clasp tips on a tooth ideally be?
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The __________ of a restoration is influenced by the health of the abutment teeth.
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What component of a partial denture provides vertical support and transmits functional forces to remaining tooth structure?
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The major connector connects the components of the prosthesis located on one side of the arch with those on the opposite side.
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What is the role of the direct retainer in a removable partial denture?
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The part of the denture which rests on the tissues is called the ______.
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Match the following components of a removable partial denture with their descriptions:
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Which term describes an area of tooth or soft tissue beyond the survey line?
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The survey line indicates the least circumference in a given horizontal plane.
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Identify one reason why a denture may be badly constructed.
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The __________ serves as a unit that connects the major connector to other units of the prosthesis.
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What is a common feature that interferes with denture insertion?
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A bony undercut labially allows for easy insertion of flanged dentures along a path at right angles to the occlusal plane.
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What are the three methods proposed to overcome interference with denture placement?
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The depth of undercut required for clasping depends on clasp material, length, and __________ of clasp arm.
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Match the following terms related to dentures with their descriptions:
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Which of the following structures may be modified to eliminate interference?
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The retentive tip should be designed to be placed in the occlusal third of the tooth.
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What is one method to create a ‘dimple’ retention area?
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The insertion of a denture may be possible if the cast is given a __________ tilt.
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What is a common consequence of having a poorly designed denture flange?
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What is the primary function of guide surfaces during the insertion of a prosthesis?
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The frictional contact of a prosthesis against parallel surfaces decreases its retention.
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What is the purpose of surveying in the context of denture design?
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A guide surface should extend vertically for about ____ mm.
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Match the following components of a dental surveyor with their functions:
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What can mesial undercuts on teeth adjacent to a saddle affect?
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The dental surveyor is used only for aesthetic evaluations.
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Name one tool used in surveying.
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The ____ helps in locking the spindle of the dental surveyor.
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What is the primary use of an analyzing rod?
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Undercut gauges typically come in four sizes.
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What is the purpose of surveying dental casts?
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The ______ is used to trim excess wax that may be inserted into undercut areas.
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Match the tools/techniques with their functions:
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Which of the following is NOT an objective of surveying?
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A survey line is a line drawn on a cast to mark the greatest contour prominence.
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What is the desirable characteristic of a soft tissue undercut?
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The device used to protect the carbon rod from breakage is known as a ______.
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Which of the following can be determined by surveying dental casts?
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Study Notes
Course Objectives
- Identify steps in partial denture construction
- Understand components of partial dentures
- Analyze reasons for poorly constructed dentures
- Recognize devices used throughout the construction process
- Explore properties and behaviors of materials involved in denture fabrication
Components of a Removable Partial Denture (RPD)
- Denture Base: The foundation that contacts tissues and supports artificial teeth.
- Occlusal Rests: Rigid extensions providing vertical support by contacting remaining tooth structures.
- Direct Retainer: Engages abutment teeth to resist displacement of the denture from the basal seat.
- Major Connector: Connects components across the dental arch, linking both sides of the prosthesis.
- Minor Connector: Connects the major connector to other parts of the prosthesis.
Terminology
- Undercut: Areas of tooth/tissue beyond the survey line, observed from specific angles.
- Survey Line: Indicates the greatest circumference of a tooth in a horizontal plane, dividing undercut and non-undercut areas.
- Path of Insertion: Direction from initial contact with teeth to complete seating of the denture.
- Path of Removal: Opposite direction from resting position to the last contact with supporting teeth.
- Guiding Planes: Flat surfaces on proximal or lingual teeth aiding in the insertion and removal of dentures.
Undercut Types
- Desirable vs. Undesirable Undercuts: Only those used for denture retention are considered desirable.
Metallic Removable Partial Dentures
- Constructed primarily of rigid materials, except for flexible clasp arms designed to engage tooth undercuts.
Factors Influencing Path of Insertion
- Interferences: Conditions obstructing easy denture placement (e.g., tooth inclination, bony undercuts).
- Retentive Undercuts: Should be appropriately located to secure clasp tips effectively.
- Guiding Planes: Enhance insertion/removal efficiency.
- Aesthetics: Reduced visibility of clasp metal and base material improves appearance.
- Health of Abutment Teeth: Stronger teeth should be used for retaining clasps.
Surveying Process
- Involves determining contour and position of abutment teeth before designing dentures to ensure proper fit.
- The dental surveyor is an instrument used to define survey lines, measure undercuts, and assess the parallelism of tooth surfaces.
Surveying Tools
- Analyzing Rods: Used to diagnose and identify undercuts.
- Undercut Gauges: Measure undercut depth (commonly in sizes 0.01", 0.02", and 0.03").
- Carbon Marker: Marks survey lines at strategic points on the cast.
- Wax Trimmer: Trims wax in undercut areas to adjust for optimal fit.
Objectives of Surveying
- Ensure that the denture can be easily inserted and retained against forces.
- Identify guiding plane parallelism and measure undercuts for proper clasp placement.
- Mark the survey line indicating contour prominence in relation to planned prosthesis placement.
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Description
Test your knowledge on the construction of partial dentures with this informative quiz. By answering questions about components, common errors, and materials used, you'll enhance your understanding of removable partial dentures (RPD). Perfect for dental students and professionals seeking to deepen their expertise.