Fixed Partial Denture Connectors Quiz
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Questions and Answers

What are semi-precision attachments primarily characterized by?

  • Their ability to be fabricated only in metal.
  • Their economy and ease of fabrication. (correct)
  • Their lack of variability in component dimensions.
  • Their high precision in fabrication.

    • Which retention method combines both frictional and mechanical features?

  • Frictional and Mechanical retention (correct)
  • Frictional retention
  • Magnetic retention
  • Mechanical retention

    • Which factor is NOT considered when selecting an attachment?

  • Location
  • Material (correct)
  • Cost
  • Function

    • What are the types of locations mentioned for attachments?

    <p>Intracoronal, extracoronal, and radicular</p> Signup and view all the answers

    Which process is NOT involved in fabricating a semi-precision attachment?

    <p>Injection molding</p> Signup and view all the answers

    How are tooth-supported restorations described in terms of functionality?

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

    Which of the following statements about semi-precision attachments is true?

    <p>They can be fabricated using a variety of alloys.</p> Signup and view all the answers

    What type of attachment allows for movements in various planes, often referred to as stress breakers?

    <p>Tooth and tissue-supported restoration</p> Signup and view all the answers

    What is a primary requirement of solder alloys in relation to the parent alloy?

    <p>Lower fusion temperature than parent alloy</p> Signup and view all the answers

    Which factor does NOT affect the success of the soldering procedure?

    <p>Color of the solder</p> Signup and view all the answers

    What is the purpose of soldering flux?

    <p>To remove oxides or prevent their formation</p> Signup and view all the answers

    Which of the following fluxes is typically used for gold alloys?

    <p>Borax glass</p> Signup and view all the answers

    What is one characteristic of lower fineness gold solders?

    <p>They are used to join castings</p> Signup and view all the answers

    What is the recommended gap distance between assembled units during soldering?

    <p>0.25 mm</p> Signup and view all the answers

    What is the function of a solder antiflux?

    <p>To limit the spread of the solder alloy</p> Signup and view all the answers

    Which mode of heat application is one of the factors affecting soldering success?

    <p>Torch or oven</p> Signup and view all the answers

    What is the primary function of solder in dental applications?

    <p>Joining components of FPD and repairing casting voids</p> Signup and view all the answers

    What is the primary function of connectors in a fixed partial denture (FPD)?

    <p>To join the individual retainers and pontics together</p> Signup and view all the answers

    What is a key benefit of using laser welding in dental procedures?

    <p>It can be used on ceramic or resin veneer without distortion</p> Signup and view all the answers

    Which of the following is NOT a type of rigid connector?

    <p>Precision Attachments</p> Signup and view all the answers

    Which description accurately defines non-rigid connectors in dental applications?

    <p>Connectors that relieve stresses or accommodate misaligned FPD abutment teeth</p> Signup and view all the answers

    Which of the following is NOT a known application of non-rigid connectors?

    <p>Full mouth dentures</p> Signup and view all the answers

    What is a significant disadvantage of using cast connectors?

    <p>Potential distortion during multiunit wax pattern fabrication</p> Signup and view all the answers

    Which of the following connector designs is optimal for cleaning?

    <p>Elliptical in proximal view and concave in buccal view</p> Signup and view all the answers

    Precision attachments are primarily characterized by which of the following features?

    <p>They are machined in special alloys under precise tolerances.</p> Signup and view all the answers

    In which scenario is a non-rigid connector particularly beneficial?

    <p>In free-end saddle cases connecting FPD and RPD</p> Signup and view all the answers

    What is the maximum melting temperature for soldering in dentistry?

    <p>450° C</p> Signup and view all the answers

    Which of the following factors does NOT influence the success of a prosthetic appliance?

    <p>Color of the denture</p> Signup and view all the answers

    What type of connectors are classified under precision attachments?

    <p>Machined components with precise fitting interlocking devices</p> Signup and view all the answers

    What is a key recommendation for the surfaces to be joined in soldering?

    <p>Surfaces should be flat and parallel</p> Signup and view all the answers

    What is one established characteristic of laser welding in dental practices?

    <p>It produces minimal heat during the process.</p> Signup and view all the answers

    Which type of connector is typically characterized by being a single-piece casting?

    <p>Cast Connectors</p> Signup and view all the answers

    Study Notes

    Fixed Partial Denture Connectors

    • Fixed partial dentures (FPD) are dental appliances that replace missing teeth.
    • Connectors are parts of an FPD that join retainers and pontics.
    • Connector components are classified as rigid and non-rigid (attachments).

    Components of FPD

    • Connector: Joins retainers and pontics.
    • Pontic: Replaces missing tooth.
    • Retainer: Part that attaches to abutment teeth.
    • Abutment Preparation: Shape of the abutment where retainer attaches.
    • Abutment: Natural teeth that support the FPD.
    • Edentulous Ridge: Bone ridge where missing teeth were.

    Definition of Connectors

    • Connectors join individual retainers and pontics of a fixed partial denture (FPD).

    Classification of Connectors

    • Rigid Connectors:
      • Cast
      • Soldered
      • Laser Welded
    • Non-rigid Connectors (Attachments):
      • Precision
      • Semi-precision

    Rigid Connectors (Cast)

    • Shaped in wax as part of a multiunit wax pattern.
    • Then cast as one piece with fixed partial denture.
    • Single-piece casting.

    Advantages of Cast Connectors

    • Convenient and minimizes steps in FPD fabrication.
    • Reduced armamentarium.
    • Less time consuming.

    Disadvantages of Cast Connectors

    • Distortion in multi-unit wax pattern fabrication.
    • Restricted to simple restorations.

    Connector Design

    • Size, shape, and position of connectors affect the success of the prosthetic appliance.
    • Connectors should be large enough to prevent distortion or fracture during function.
    • Provide oral hygiene access at the tissue surface of the connector.
    • Properly positioned to avoid interfering with esthetics.
    • Highly polished at the tissue surface.
    • Should have an elliptical shape in a proximal view and a concave shape in a buccal or lingual view.

    Soldered Connectors (Joints)

    • Metal components are joined using filler metal (solder).
    • Solder is fused to the parts being joined.
    • Solder's melting temperature must be lower than the parent metal's melting temperature.
    • The filler metal has a melting point below 450°C.
    • Rigid connections in dentistry are generally fabricated above 450°C.
    • Connectors to be soldered are waxed to final shape and then sectioned with a thin ribbon saw.
    • The surfaces to be joined must be flat and parallel; an even gap width of 0.25mm is recommended.
    • Cleanliness of the surfaces is important for good wetting by the solder alloy.

    Soldered Connectors (Joints) - Types of Cuts

    • Straight cut across interproximal connector
    • Diagonal cut across pontic (minimal clean distance 0.13 to 0.3)

    Soldered Connectors (Joints)-Materials

    • Flux: Applied to metal surfaces to remove oxides.
    • Solder: Fused to join components.
    • Antiflux: Used to limit spreading of solder alloy.
      • Examples: graphite pencil, iron oxide (rouge).

    Solder Use Cases

    • Join components of FPDs
    • Build proximal contacts
    • Repair casting voids or broken parts.

    Laser Welding Connectors

    • Spot welding by electric current
    • Laser welding using pulsed Nd:YAG laser with high power.
    • Autogenous welding - instantaneous thermal effect of laser beam concentrated on a minute spot.
    • Wax patterns are constructed and cast; contact areas are modified to be flat with minimal space; welding is performed on the master cast.
    • Maximum penetration depth is 2.5 mm.
    • Usable on ceramic or resin veneer without distortion.

    Non-Rigid Connectors

    • Attachment: a connector with two or more parts.
    • One part attaches to a tooth, root, or implant; the other to a prosthesis.
    • Exceptions: some attachments have only one part; the other is made.
    • Classified into precision and semi-precision types.

    Attachment Applications

    • Fixed partial dentures (FPD)
    • Removable partial dentures (RPD)
    • Over dentures
    • Implant-supported restorations
    • Maxillofacial prosthetics

    Cases for Non-rigid Connectors

    • Pier abutments
    • Tilted molar abutments
    • Tooth-implant supported FPDs
    • Free-end saddle cases
    • Connection between FPD and RPD

    Non-Rigid Connectors - Attachments

    • Dove tail (key and ways)
    • Loop
    • Split pontic
    • Cross pin and wing

    Precision Attachments

    • Components machined in special alloys with precise tolerances.
    • Accurate interlocking device to fix restoration to natural teeth.
    • Made of platinum-palladium alloys.
    • Withstand high temperatures associated with casting ceramic alloys.

    Semi-precision Attachments

    • Fabricated by direct casting of wax, plastic or refractory patterns.
    • Considered semi-precision due to variations in fabrication (e.g., water/powder ratios, temperatures).
    • Economical, easy to fabricate, suitable for a wide range of alloys without issues of coefficient differences between the cast and machined alloy.
    • Techniques: prefabricated plastic components, precision milling.

    Factors Considered When Selecting an Attachment

    • Location: Intracoronal, Extracoronal, Radicular/Intraradicular, Bar, Cross-pin, Wing, Split pontic
    • Function: Solid vs. resilient restorations; movement ranges
    • Retention: Frictional, mechanical, combined, magnetic, screwed.
    • Available Space: Vertical, faciolingual, mesiodistal.
    • Cost: Precision vs. semi-precision.

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    Related Documents

    Fixed Partial Denture Connectors PDF

    Description

    Test your knowledge on fixed partial dentures and their connectors. This quiz covers the components, definitions, classifications, and types of connectors used in dental practices. Understand the role of retainers, pontics, and abutments in FPD.

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