Dental Prosthodontics Surveying and Clasp Selection Quiz
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Questions and Answers

Which of the following is an objective of Anna Yi's lecture?

  • To critique the use of retentive undercuts in prosthodontics
  • To debate the effectiveness of different types of dental floss
  • To discuss the differences between various types of major connectors (correct)
  • To perform a live demonstration of prosthodontic procedures

    • What is the reason provided for the utilization of different clasp designs?

  • To reduce the need for rest seats
  • To achieve ideal survey lines (correct)
  • To enhance aesthetic appeal in prosthodontic treatments
  • To analyze force distribution in dental bridges

    • According to the lecture objectives, what should students be able to do with regard to retentive clasps?

  • Conduct a comparative study of different restorative materials
  • Select a retentive clasp based on anatomy and location of retentive undercut (correct)
  • Explain the process of enamel bonding for retentive clasps
  • Discuss the history of retentive clasps in dentistry

    • What is the primary focus when discussing the various types of rests in the lecture objectives?

    <p>Correctly select the appropriate rests based on force distribution criteria</p> Signup and view all the answers

    Which type of clasp is indicated when there are no edentulous space on the other side of the arch?

    <p>Embrasure Clasp</p> Signup and view all the answers

    What is the disadvantage of using Hairpin Clasp / C Clasp / Fishhook Clasp / Reverse loop?

    <p>Food trap</p> Signup and view all the answers

    Which type of clasp engages the ML or MB undercut on mandibular molars?

    <p>Ring Clasp</p> Signup and view all the answers

    In which direction does the Infrabulge clasp approach the undercut?

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

    What does RPI stand for in the context of Removable Partial Denture (RPD)?

    <p>Rest, Proximal Plate and I Bar</p> Signup and view all the answers

    What is the main purpose of Overlay / Onlay Clasp?

    <p>To cover the occlusal surface of tilted molars</p> Signup and view all the answers

    What is a contraindication for using Infrabulge clasps?

    <p>Lack of facial undercut</p> Signup and view all the answers

    What is the main purpose of indirect retention in free-end saddle cases?

    <p>To prevent movement of the denture base during function</p> Signup and view all the answers

    In what situation is a lingual plate major connector indicated?

    <p>When lingual tori are present</p> Signup and view all the answers

    What is the design consideration for fabricating a labial bar major connector?

    <p>Must have adequate labial sulcus depth &gt; 7 mm</p> Signup and view all the answers

    When is an interrupted lingual bar major connector used?

    <p>When there are diastemata in the anterior teeth</p> Signup and view all the answers

    What distinguishes a sublingual bar from a lingual bar?

    <p>The shape and dimensions of the bar</p> Signup and view all the answers

    What is the most common design of a lingual bar major connector?

    <p>Half pear shaped bar with 4 mm in height and 2 mm in width</p> Signup and view all the answers

    What are the indications for using a Kennedy bar/double lingual bar/cingulum bar major connector?

    <p>When space does not allow placement of a lingual bar</p> Signup and view all the answers

    What distinguishes a lingual plate from a labial bar major connector?

    <p>Superior margin placement near the junction of Middle and Gingival third</p> Signup and view all the answers

    What is the advantage of the Combination clasp?

    <p>Flexibility and adjustability</p> Signup and view all the answers

    Where is the undercut located for the Reverse loop undercut clasp?

    <p>Near zone</p> Signup and view all the answers

    What is the main disadvantage of the Reverse Circlet / Reverse attachment clasp arm?

    <p>Interferes with the occlusion</p> Signup and view all the answers

    Which clasp cannot be used if the sulcus depth is shallow?

    <p>Roach Clasp / Infrabulge Clasp</p> Signup and view all the answers

    What is the treatment option for Atypical B Survey line?

    <p>Recontour tooth to move the survey line</p> Signup and view all the answers

    What is the purpose of an Overlay / Onlay rest?

    <p>To eliminate the need for cast restoration on abutment teeth</p> Signup and view all the answers

    What type of rest helps prevent food impaction where it is adjacent to the abutment tooth?

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

    What is the function of an Interproximal rest?

    <p>Embrasure preparation</p> Signup and view all the answers

    What is the advantage of using a Roach Clasp / Infrabulge Clasp?

    <p>Engagement with shallow sulcus depth</p> Signup and view all the answers

    What is the purpose of a Cast reciprocal arm in a Combination clasp?

    <p>To provide stability to the clasp assembly</p> Signup and view all the answers

    What is the primary function of a Rest Seat in dentistry?

    <p>To receive the occlusal, incisal, cingulum, or lingual rest</p> Signup and view all the answers

    What is the treatment option for Atypical C Survey line?

    <p>Extended arm clasp</p> Signup and view all the answers

    What is the purpose of an embrasure clasp?

    <p>To provide indirect retention for denture base movement</p> Signup and view all the answers

    Why is the preparation of marginal ridges and adjacent facial inclines necessary for embrasure clasps?

    <p>To provide sufficient metal bulk and avoid clasp fracture</p> Signup and view all the answers

    Which type of RPDs require indirect retention?

    <p>Kennedy Class I, II, and IV</p> Signup and view all the answers

    What is the preferred location for placing the retentive clasp terminal to increase retention?

    <p>Greater horizontal undercut or angle of cervical convergence</p> Signup and view all the answers

    What is the main function of an indirect retainer in RPDs?

    <p>To prevent rotation of the denture base</p> Signup and view all the answers

    Why are incisal rests mostly used on canines?

    <p>Canines have a greater distance from the abutment's center of rotation</p> Signup and view all the answers

    What should be considered when preparing incisal rests?

    <p>The depth and width dimensions of the rest</p> Signup and view all the answers

    What is a potential drawback of incisal rests?

    <p>They may deliver harmful forces due to greater distance from abutment's center of rotation</p> Signup and view all the answers

    Which of the following palatal connectors consists of a thin sheet of metal and may be preferred by patients due to the exposed palate?

    <p>U-shaped (horseshoe)</p> Signup and view all the answers

    What is the primary reason for not using a thin sheet of metal for the U-shaped (horseshoe) palatal connector in distal extension RPD?

    <p>Less resistance to flexure</p> Signup and view all the answers

    Which type of palatal connector is thinner than the palatal bar and is more comfortable for patients?

    <p>Palatal strap</p> Signup and view all the answers

    When is the antero-posterior palatal strap/bar major connector used?

    <p>When torus is present and is to be removed</p> Signup and view all the answers

    What are the indications for using a complete palatal plate major connector?

    <p>Few anterior teeth are remaining</p> Signup and view all the answers

    What is the primary advantage of a complete palatal plate major connector?

    <p>Ultimate rigidity and support for the RPD</p> Signup and view all the answers

    What should be considered when selecting a retentive clasp with respect to material and configuration?

    <p>Anatomy and location of retentive undercut</p> Signup and view all the answers

    What are the variations of the palatal strap major connector?

    <p>Anterior palatal strap / Posterior palatal strap</p> Signup and view all the answers

    'Flex your RPD knowledge muscles' implies considering what aspect when discussing the antero-posterior palatal strap/bar major connector?

    <p>'Flexural strength'</p> Signup and view all the answers

    'Cues for discussion points' when examining the complete palatal plate major connector include considering what aspects?

    <p>'Pros and cons'</p> Signup and view all the answers

    Study Notes

    • An embrasure clasp consists of two components joined at their bodies
    • Frequently used for sides without edentulous space
    • Originated as a minor connector between teeth
    • Preparation of marginal ridges and adjacent facial inclines needed for sufficient metal bulk
    • Inadequate preparation can result in thin metal, leading to clasp fracture
    • Occlusal rests should be properly prepared for dentures and to prevent occlusal problems
    • Indirect retainers used to prevent rotation of denture base caused by occlusal forces or sticky foods
    • Indirect retainer functions through lever action on the opposite side of the fulcrum line when denture base moves
    • Indirect retainers reduce tendency for denture base to move in occlusal direction or rotate around fulcrum line
    • Kennedy Class I, II, and IV RPDs require indirect retention, not Class III
    • Various rests can act as indirect retainers: occlusal, cingulum, or incisal
    • Incisal rests are prepared on incisal edges, mostly used on canines
    • Dimensions: 1.5 mm depth x 2.5 mm width, esthetic impact on patient should be considered
    • Incisal rests may deliver harmful forces due to greater distance from abutment's center of rotation
    • Cingulum rest is preferred over incisal rest, mostly used on maxillary canines, dimensions same as incisal rests
    • Lecture objectives: discuss differences between major connectors, choose appropriate one, and understand various clasp designs
    • Selecting retentive clasp based on undercut anatomy and location
    • Placing the retentive clasp terminal in greater horizontal undercut or angle of cervical convergence increases retention
    • Materials used for fabricating RPD: chrome cobalt, wrought wire
    • Original Research Article: Bend testing of wrought wire removable partial denture alloys, J Prosthet Dent. 1996 Nov;76(5):559-65
    • Further reading: Dental Technician, Prosthetic, Navy Training Course; Stewart's Clinical Removable Partial Prosthodontics, 4th Edition; McCracken's Removable Partial Prosthodontics, 12th Edition; Bend testing of wrought wire removable partial denture alloys, J Prosthet Dent. 1996 Nov;76(5):559-65

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    Description

    Test your knowledge of dental prosthodontics surveying, clasp selection, and types of rests. This quiz covers the anatomy and location of retentive undercuts, materials and configurations for retentive clasps, and the criteria for force distribution to select appropriate rests.

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