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Partial Denture Construction Quiz
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Partial Denture Construction Quiz

Created by
@LuxuriousPine

Questions and Answers

Which type of undercut is desirable for denture retention?

  • Tooth Undercuts
  • Desirable Undercuts (correct)
  • All Undercuts are Undesirable
  • Soft Tissue Undercuts

    • 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 __________.

    <p>Path of Removal</p> Signup and view all the answers

    Match the following components with their descriptions:

    <p>Guiding Planes = Flat axial surfaces guiding the prosthesis Flexible Clasp Arm = Engages undercut areas for retention Retentive Undercuts = Should be equal in depth for effective clasps Undesirable Undercuts = Generally impede restorative procedures</p> Signup and view all the answers

    Which factor does NOT affect the path of insertion?

    <p>Patient age</p> Signup and view all the answers

    Guiding planes only apply to the lingual surfaces of teeth.

    <p>False</p> Signup and view all the answers

    What should the location of clasp tips on a tooth ideally be?

    <p>Gingival third</p> Signup and view all the answers

    The __________ of a restoration is influenced by the health of the abutment teeth.

    <p>Retention</p> Signup and view all the answers

    What component of a partial denture provides vertical support and transmits functional forces to remaining tooth structure?

    <p>Occlusal Rests</p> Signup and view all the answers

    The major connector connects the components of the prosthesis located on one side of the arch with those on the opposite side.

    <p>True</p> Signup and view all the answers

    What is the role of the direct retainer in a removable partial denture?

    <p>To engage an abutment tooth and resist displacement of the prosthesis.</p> Signup and view all the answers

    The part of the denture which rests on the tissues is called the ______.

    <p>Denture Base</p> Signup and view all the answers

    Match the following components of a removable partial denture with their descriptions:

    <p>Denture Base = Rests on tissues and holds artificial teeth Direct Retainer = Resists displacement of the prosthesis Major Connector = Connects parts of the prosthesis on opposite sides Minor Connector = Connects major connector to other units</p> Signup and view all the answers

    Which term describes an area of tooth or soft tissue beyond the survey line?

    <p>Undercut</p> Signup and view all the answers

    The survey line indicates the least circumference in a given horizontal plane.

    <p>False</p> Signup and view all the answers

    Identify one reason why a denture may be badly constructed.

    <p>Poor fit or incorrect materials used.</p> Signup and view all the answers

    The __________ serves as a unit that connects the major connector to other units of the prosthesis.

    <p>Minor Connector</p> Signup and view all the answers

    What is a common feature that interferes with denture insertion?

    <p>Severe Lingual Inclination of Teeth</p> Signup and view all the answers

    A bony undercut labially allows for easy insertion of flanged dentures along a path at right angles to the occlusal plane.

    <p>False</p> Signup and view all the answers

    What are the three methods proposed to overcome interference with denture placement?

    <p>Avoidance, Elimination, Exploitation</p> Signup and view all the answers

    The depth of undercut required for clasping depends on clasp material, length, and __________ of clasp arm.

    <p>cross sectional area</p> Signup and view all the answers

    Match the following terms related to dentures with their descriptions:

    <p>Retentive undercuts = Areas used for clasping Guiding planes = Parallel axial surfaces Inadequate retention = Denture instability Excessive retention = Difficulty in denture removal</p> Signup and view all the answers

    Which of the following structures may be modified to eliminate interference?

    <p>Teeth or bone</p> Signup and view all the answers

    The retentive tip should be designed to be placed in the occlusal third of the tooth.

    <p>False</p> Signup and view all the answers

    What is one method to create a ‘dimple’ retention area?

    <p>Enamoplasty</p> Signup and view all the answers

    The insertion of a denture may be possible if the cast is given a __________ tilt.

    <p>posterior</p> Signup and view all the answers

    What is a common consequence of having a poorly designed denture flange?

    <p>Poor retention</p> Signup and view all the answers

    What is the primary function of guide surfaces during the insertion of a prosthesis?

    <p>To guide the prosthesis in or out of place without excessive forces</p> Signup and view all the answers

    The frictional contact of a prosthesis against parallel surfaces decreases its retention.

    <p>False</p> Signup and view all the answers

    What is the purpose of surveying in the context of denture design?

    <p>To locate and delineate the contour and position of the abutment teeth and associated structures.</p> Signup and view all the answers

    A guide surface should extend vertically for about ____ mm.

    <p>3</p> Signup and view all the answers

    Match the following components of a dental surveyor with their functions:

    <p>Base = Supports the surveyor Cross Arm with Spindle Housing = Holds the spindle and tool holder Undercut Gauge = Measures tooth undercuts Analyzing Rods = Helps identify contours of teeth</p> Signup and view all the answers

    What can mesial undercuts on teeth adjacent to a saddle affect?

    <p>The appearance when replacing anterior teeth</p> Signup and view all the answers

    The dental surveyor is used only for aesthetic evaluations.

    <p>False</p> Signup and view all the answers

    Name one tool used in surveying.

    <p>Carbon Marker</p> Signup and view all the answers

    The ____ helps in locking the spindle of the dental surveyor.

    <p>Screw To Lock The Spindle</p> Signup and view all the answers

    What is the primary use of an analyzing rod?

    <p>Locating the presence or absence of undercuts</p> Signup and view all the answers

    Undercut gauges typically come in four sizes.

    <p>False</p> Signup and view all the answers

    What is the purpose of surveying dental casts?

    <p>To design a partial denture that can be easily inserted, removed, retained against dislodging forces, and has the best possible appearance.</p> Signup and view all the answers

    The ______ is used to trim excess wax that may be inserted into undercut areas.

    <p>wax trimmer</p> Signup and view all the answers

    Match the tools/techniques with their functions:

    <p>Analyzing rod = Diagnostic for undercuts Undercut gauge = Measures undercuts Carbon rod = Marks survey line Wax trimmer = Trims excess wax</p> Signup and view all the answers

    Which of the following is NOT an objective of surveying?

    <p>Create new teeth</p> Signup and view all the answers

    A survey line is a line drawn on a cast to mark the greatest contour prominence.

    <p>True</p> Signup and view all the answers

    What is the desirable characteristic of a soft tissue undercut?

    <p>It should be within the acceptable limits for retaining a clasp.</p> Signup and view all the answers

    The device used to protect the carbon rod from breakage is known as a ______.

    <p>metal shield</p> Signup and view all the answers

    Which of the following can be determined by surveying dental casts?

    <p>Bony undercuts and areas of interference</p> Signup and view all the answers

    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.

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