Bio-Mechanical Principles and Tooth Preparation
10 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which type of margin is considered more conservative in tooth preparation?

  • Chamfer
  • Shoulder (correct)
  • Bevel
  • None of the above
  • Placing the margin of a dental restoration subgingivally is widely accepted due to its absence of adverse effects on dental health.

    False

    What is one of the primary reasons for sufficient axial reduction in tooth preparation?

    To secure space for adequate thickness of restorative material.

    The placement of the finish line should ideally be _____ to facilitate cleaning by the patient.

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

    Match the following advantages with supragingival margin placement:

    <p>Easily prepared without trauma to the soft tissue = Advantage 1 Easily finished and kept clean = Advantage 2 Prevents excessive gingival inflammation = Advantage 3</p> Signup and view all the answers

    What is the minimum distance a crown margin should be placed from the alveolar crest to avoid bone resorption?

    <p>2.0 mm</p> Signup and view all the answers

    The adaptation of the restoration margin to the tooth is crucial in reducing the chances of recurrent caries.

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

    What happens if the crown margin intrudes into the biologic width?

    <p>Inflammation will result and bone will recede.</p> Signup and view all the answers

    A well-designed preparation has a margin that is _____ and even.

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

    Match the following scenarios with their implications:

    <p>Subgingival margins are necessary = May lead to exposure of the root surface Rough or stepped junctions = Increased risk of recurrent caries Well-designed preparation = Improved marginal adaptation Closer margin to alveolar crest = Higher chance of bone resorption</p> Signup and view all the answers

    Study Notes

    Bio-Mechanical Principles and Tooth Preparation

    • Improper tooth preparation can negatively affect long-term dental health
    • Axial reduction is crucial for creating space for restorative materials with proper thickness
    • Margin placement significantly impacts restoration fabrication and cleanliness
    • Supragingival margins are generally preferred for ease of preparation, finishing, and impression taking, as well as for easy restoration evaluation
    • Subgingival margins are necessary in certain cases, such as when caries, erosion, or previous restorations extend subgingivally, or when additional retention is needed
    • Crown margins should be placed at least 2.0 mm away from the alveolar crest to avoid bone resorption

    Marginal Integrity

    • Marginal adaptation is crucial for preventing recurrent caries and periodontal disease
    • Smooth and even margins minimize chances of recurrent caries and periodontal disease
    • A well-designed preparation ensures a smooth and even margin
    • Featheredge margins (shoulderless) should be avoided due to lack of bulk at the margin, which can lead to over contoured restorations
    • Chisel-edge margins are associated with excessively tapered preparations and can be difficult to control
    • Chamfer margins are ideal for cast metal crowns and metal portions of metal-ceramic crowns, providing adequate bulk and a distinct finish line
    • Beveled margins are suitable for cast restorations when a ledge or shoulder exists, providing a smooth transition between the restoration and unprepared tooth structure
    • Shoulder margins are recommended for all-ceramic crowns and facial portions of metal-ceramic crowns, providing adequate bulk for porcelain
    • Radial shoulder margins offer a modified shoulder design with a rounded internal angle, reducing stress concentration in the tooth structure
    • Sloped shoulder margins are a modification of the classic shoulder design, reducing the possibility of leaving unsupported enamel
    • Shoulder with bevel margins are used for proximal boxes of inlays and onlays, occlusal shoulder of onlays and mandibular three-quarter crowns, and facial finish line of metal-ceramic restorations where gingival esthetics are not critical

    Finish Line Types, Advantages, and Disadvantages

    • Feather Edge: Conservation of tooth structure, Can lead to over-contoured restorations
    • Chisel Edge: Conservation of tooth structure, Can lead to over-contoured restorations, Difficult to control margin location
    • Chamfer: Distinct, well-defined finish line, Care during preparation to avoid unsupported enamel, Suitable for cast metal restorations, lingual margins of labial veneer metal-ceramic restorations
    • Shoulder: Adequate bulk of restorative material, Less conservative than chamfer finish line, Sharp internal line angle, Suitable for full veneer metal-ceramic restorations, all-ceramic crowns
    • Shoulder with Bevel: Adequate bulk of restorative material, Less conservative to tooth structure, Bevel removes unsupported enamel, Bevel needs to be placed apically, Suitable for metal-ceramic restorations, previous caries or restorations at finish line area
    • Beveled: Removes unsupported enamel, Less conservative, Requires subgingival extension for optimal esthetics, Suitable for ledges due to previous caries or erosion at the cervical margin

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Fixed Theoretical Fall 2024 PDF

    Description

    Explore the critical concepts of tooth preparation and marginal integrity in dental practice. Understand the importance of axial reduction, margin placement, and their effects on restoration success and oral health. This quiz will deepen your knowledge of best practices for effective tooth preparation.

    More Like This

    Use Quizgecko on...
    Browser
    Browser