Lecture 4 - 02202024
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Questions and Answers

What is a key advantage of using a cement-retained crown instead of a screw-retained crown?

  • Allows for easy correction of angulation during crown placement (correct)
  • Provides better resistance and retention form
  • Ensures immediate and perfect seating of the crown
  • Reduces the chances of developing complications after crown placement

    • In case of drifting teeth, why is it preferable to use a cement-retained crown rather than a screw-retained crown?

  • Ensures better resistance and retention form
  • Reduces the chances of crown fracture during placement
  • Provides immediate and perfect seating of the crown
  • Allows for angulation adjustment to prevent gaps between teeth (correct)

    • How does the use of an abutment in cement-retained crowns contribute to proper crown placement?

  • Increases the chances of crown fracture during placement
  • Corrects the angulation for optimal crown seating (correct)
  • Compromises the resistance and retention form
  • Reduces the longevity of the crown

    • What limits the ability to correct angulation when using screw-retained crowns?

    <p>The fixed seating orientation of screw-retained crowns (B)</p> Signup and view all the answers

    How does cement-retained crown placement help prevent the formation of black triangles between teeth?

    <p>By allowing adjustment of angulation for proper seating (D)</p> Signup and view all the answers

    According to the information provided, which of the following statements is true regarding screw-retained crowns?

    <p>They have a higher risk of fractures in the areas surrounding the screw access hole. (B)</p> Signup and view all the answers

    What is the primary reason cited for the difficulty in placing crowns in the posterior region?

    <p>The jaw acts as a class three lever, with less space available in the posterior region. (A)</p> Signup and view all the answers

    Which of the following statements about cement-retained crowns is true based on the information provided?

    <p>They are less susceptible to occlusion-related issues due to the absence of a screw access hole. (A)</p> Signup and view all the answers

    What is the primary consideration when adjusting occlusion for dental crowns?

    <p>Ensuring proper contact patterns to distribute forces evenly across the crown. (D)</p> Signup and view all the answers

    What is one reason why working with a cement-retained crown can be challenging according to the text?

    <p>The crown has a smaller profile compared to a screw-retained crown. (D)</p> Signup and view all the answers

    According to the information provided, which of the following statements about resistance and retention form is true?

    <p>The text does not provide specific information about resistance and retention form for dental crowns. (A)</p> Signup and view all the answers

    Based on the text, what does historical literature suggest about screw loosening for cement-retained crowns?

    <p>It happens less frequently than with screw-retained crowns. (B)</p> Signup and view all the answers

    What is highlighted as a major disadvantage of cement-retained crowns in the text?

    <p>Increased likelihood of restoration failure. (B)</p> Signup and view all the answers

    How does the size of a cement-retained crown affect the difficulty of placement according to the text?

    <p>It adds to the challenge of proper fitting due to its small profile. (B)</p> Signup and view all the answers

    Why does the text mention that occlusion adjustments play a critical role in the performance of cement-retained crowns?

    <p>To emphasize that occlusion impacts the rate of screw loosening. (D)</p> Signup and view all the answers

    Which of the following is NOT a disadvantage of screw-retained crowns?

    <p>Difficulty in retrieving the crown (D)</p> Signup and view all the answers

    What is the primary advantage of cement-retained crowns over screw-retained crowns?

    <p>Improved esthetics, especially in anterior regions (C)</p> Signup and view all the answers

    If a patient reports that a screw-retained crown is getting loose a week after placement, what is the most likely reason?

    <p>The occlusion was not adjusted properly (D)</p> Signup and view all the answers

    Which of the following statements about resistance and retention form is correct?

    <p>Cement-retained crowns have better retention form than screw-retained crowns (A)</p> Signup and view all the answers

    What is the primary concern with leaving residual cement behind for cement-retained crowns?

    <p>Increased risk of peri-implantitis (D)</p> Signup and view all the answers

    Why is it important to consider the long axis of the dental implant when designing crown placement?

    <p>To avoid unfavorable forces and restorative complications (A)</p> Signup and view all the answers

    What is the main concern associated with a large degree of deviation in dental implant placement?

    <p>Risk of screw loosening and bone loss (D)</p> Signup and view all the answers

    How does tilting the implant affect the lingual area of the crown?

    <p>It increases the lingual surface area (D)</p> Signup and view all the answers

    What is a significant disadvantage of a screw-retained crown compared to a cement-retained one?

    <p>Increased susceptibility to screw loosening (A)</p> Signup and view all the answers

    How does improper crown placement increase the risk of restorative complications?

    <p>By causing unfavorable forces and screw loosening (B)</p> Signup and view all the answers

    Why is it important for the transition from the implant platform to the gingival margin to be at least three millimeters?

    <p>To prevent food from getting stuck in a concave transition. (A)</p> Signup and view all the answers

    Why is it ideal for dental implants to be placed parallel to the long axis of the tooth?

    <p>To reduce the risk of bone loss and restorative complications. (A)</p> Signup and view all the answers

    What type of profile is preferable for the emergence of crowns in dental implants?

    <p>Convex (B)</p> Signup and view all the answers

    Why is it crucial for the implant placement to be directly underneath the central fossa of the tooth?

    <p>To direct forces on the crown during restoration. (A)</p> Signup and view all the answers

    What is the purpose of ensuring that the crown has a height of contour?

    <p>To simplify cleaning and maintenance. (C)</p> Signup and view all the answers

    Which type of crown is more likely to lead to plaque and food accumulation around the implant?

    <p>Concave crown (C)</p> Signup and view all the answers

    In what scenario would a concave transition from the implant platform to the gingival margin be acceptable?

    <p>To match a concave crown's shape. (C)</p> Signup and view all the answers

    Why should all implants ideally be placed parallel to the long axis of the tooth?

    <p>To prevent bone loss and restorative complications. (A)</p> Signup and view all the answers

    Why is it important for a crown to have a convex height of contour?

    <p>To ease cleaning and maintenance. (D)</p> Signup and view all the answers

    What type of dental crown is most suitable for preventing plaque buildup around an implant?

    <p>Convex crown (C)</p> Signup and view all the answers

    What is the primary reason the speaker emphasizes the difficulty in ensuring all cement is removed when placing a cemented crown?

    <p>The cement can be difficult to visualize on X-rays due to the opacity of the implant. (B)</p> Signup and view all the answers

    According to the speaker, what is a key limitation of using two-dimensional X-rays to evaluate the fit of a cemented crown?

    <p>Two-dimensional X-rays cannot show if cement is present on the back side of the implant. (A)</p> Signup and view all the answers

    What is a key advantage of using a screw-retained crown over a cement-retained crown, as implied by the speaker?

    <p>Screw-retained crowns eliminate the risk of leaving behind residual cement. (D)</p> Signup and view all the answers

    According to the speaker, what is a potential consequence of leaving behind cement when placing a cemented crown?

    <p>Increased risk of developing peri-implant inflammation. (A)</p> Signup and view all the answers

    What does the speaker suggest as a solution to the difficulty in ensuring complete cement removal when placing a cemented crown?

    <p>Using a screw-retained crown instead of a cement-retained crown. (B)</p> Signup and view all the answers

    Flashcards

    Screw Retention and Microfractures

    When a screw is used to retain a dental crown, having a hole in the center can weaken the surrounding area, making it prone to tiny fractures and eventually breaking.

    Cement Retention and Fracture Prevention

    Using cement to hold a crown in place eliminates the risk of fractures and tiny fractures associated with screw retention.

    Jaw as a Lever

    The jaw operates like a class three lever, with the back (posterior) region having less space compared to the front (anterior).

    Posterior Crown Placement

    Fitting a crown in the back of the mouth is difficult, limited space and precise angulation are crucial.

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    Screw Retention for Posterior Crowns

    Screws offer greater flexibility when positioning dental crowns in the back of the mouth.

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    Cement Retention and Aesthetics

    Cementing a crown provides a more aesthetically pleasing result, but it can be more difficult to get the angulation just right.

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    Cement Retention and Restorative Failure

    Although cementing reduces the risk of a screw becoming loose, it can lead to a problem with the restoration before the implant itself shows any signs of failure.

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    Advantages of Cement Retention

    Cementing crowns offers advantages such as easier angulation adjustments, better looks, and a lower risk of a screw loosening.

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    Disadvantages of Cement Retention

    Disadvantages of cement retention include difficulty in removing the crown, a risk of cement being left behind, and potential for compromised aesthetics.

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    Disadvantages of Screw Retention

    Screw retention makes it easier to remove a crown and reduces the risk of cement being left behind, but it can be harder to get the correct angulation.

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    Ideal Implant Placement

    Ideally, dental implants should be placed parallel to the natural tooth to minimize bone loss, complications, and ensure proper force distribution.

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    Angulation Deviation and Complications

    Significant deviations from the ideal implant angulation can lead to uneven force distribution, less restorative material, and potential aesthetic issues.

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    Cantilever Structure

    A cantilever is a bridge-like structure that requires a minimum of 3mm space from the implant to the gum line.

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    Concave Emergence Profile

    The emergence profile should be concave, allowing for easier cleaning and preventing plaque and food accumulation.

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    Cement and Peri-implantitis

    Leaving cement behind is a major cause of inflammation around the implant.

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    Cement Removal Challenges

    Identifying and removing excess cement can be difficult due to its opaque nature and how it appears on x-rays.

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    Importance of Clean Cement Removal

    Ensuring all cement is removed is crucial to prevent complications around the implant.

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    Cement Retention

    Cement retention is the use of dental cement to hold a crown in place.

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    Screw Retention

    Screw retention uses a screw to secure a crown to an implant.

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    Cantilever

    A cantilever is a bridge-like dental structure that is supported on one end, with the other end extending out over a gap.

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    Emergence Profile

    The emergence profile refers to the shape of the crown from the gum line to the biting surface.

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    Peri-implantitis

    Peri-implantitis is an infection around a dental implant.

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    Abutment

    An abutment is a piece of dental material that connects the implant to the crown.

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    Posterior Region

    The posterior region of the mouth refers to the back teeth.

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    Angulation

    Angulation refers to the angle at which a crown is positioned on the implant.

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    Class Three Lever

    A class three lever is a type of lever where the effort is applied closer to the fulcrum than the load.

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    Crown

    A crown is a dental restoration that replaces a lost or damaged natural tooth.

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    Dental Implant

    A dental implant is a metal post that is surgically placed into the jawbone.

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    Long Axis of a Tooth

    The long axis of a tooth refers to the imaginary line that runs from the tip of the root to the top of the crown.

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    Bone Loss

    Bone loss refers to the loss of jawbone density.

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    Study Notes

    Porcelain Fractures and Screw Retention

    • Having a hole in the middle of the crown can lead to compromised areas around the screw, making them prone to micro fractures and eventual fractures.
    • Cement retention eliminates the risk of micro fractures and fractures.

    Posterior Region and Jaw Lever

    • The jaw is a class three lever, with the least amount of room in the posterior region and the most amount in the front.
    • Fitting a crown in the posterior region can be challenging due to limited space and the need for precise angulation.

    Screw vs. Cement Retention

    • Screw retention allows for easier manipulation in the posterior region.
    • Cement retention provides better esthetic results, but can be more difficult to correct angulation.
    • Cement retention reduces the risk of screw loosening, but may lead to restorative failure before the abutment shows any signs of failure.

    Advantages and Disadvantages of Cement Retention

    • Advantages: easier to correct angulation, better esthetic results, and reduced risk of screw loosening.
    • Disadvantages: difficulty in retrieving the crown, potential for cement to be left behind, and compromised esthetics.

    Disadvantages of Screw Retention

    • Difficulty in correcting angulation, potential for screw loosening, and compromised esthetics.
    • Advantages: easy to retrieve, and less risk of cement being left behind.

    Implant Placement and Angulation

    • Ideally, implants should be placed parallel to the long axis of the tooth to direct forces favorably and reduce bone loss and restorative complications.
    • Large degrees of deviation can lead to unfavorable forces, less restorative material, and compromised esthetics.

    Cantilever and Emergence Profile

    • A cantilever is a bridge-like structure that requires at least three millimeters of space from the implant platform to the gingival margin.
    • The emergence profile should be concave to allow for cleaning and to prevent plaque and food accumulation.

    Leaving Cement Behind

    • Leaving cement behind is a major cause of peri-implantitis.
    • It can be difficult to identify and remove excess cement due to its opacity and 2D representation on x-rays.
    • It is essential to ensure that all cement is removed to prevent complications.

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    Lecture 4 02202024.txt

    Description

    Test your knowledge on dental crowns and the risk of porcelain fractures. Learn about the impact of occlusion and improper adjustments on crown integrity.

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