Dental Fiber Posts
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Questions and Answers

What is the approximate flexural strength of glass-, silica-, or quartz-fiber posts?

  • 500 MPa
  • 1000 MPa (correct)
  • 2000 MPa
  • 1500 MPa
  • What is the primary advantage of using quartz-fiber posts over carbon fiber posts?

  • Improved mechanical properties
  • Enhanced esthetic qualities
  • Increased ability to chemically bond to the polymer matrix
  • All of the above (correct)
  • What is the purpose of silanization, hydrofluoric etching, and sandblasting in the preparation of fiber posts?

  • To enhance the mechanical properties of the posts
  • To reduce the flexural strength of the posts
  • To improve the bonding at the post/core/cement interfaces (correct)
  • To increase the radiopacity of the posts
  • What is the effect of using light-transmitting posts on the polymerization of resin-based luting cements?

    <p>It enhances the polymerization of resin-based luting cements</p> Signup and view all the answers

    What is the typical flexural modulus of glass-, silica-, or quartz-fiber posts?

    <p>23 GPa</p> Signup and view all the answers

    What is the effect of silanization, hydrofluoric etching, and sandblasting on the mechanical properties of different glass-, silica-, or quartz-fiber posts?

    <p>They do not modify the mechanical properties</p> Signup and view all the answers

    What is a benefit of bonding fiber posts to root canal dentin?

    <p>Improved distribution of forces along the root, thereby decreasing the risk of root fracture</p> Signup and view all the answers

    What was the failure rate of 1306 fiber posts in a retrospective study?

    <p>3.2%</p> Signup and view all the answers

    What was the survival rate of parallel-sided fiber posts in anterior teeth covered with full-ceramic crowns?

    <p>98.6%</p> Signup and view all the answers

    What was the mean observation period in a study on fiber posts in anterior teeth covered with full-ceramic crowns?

    <p>5.3 years</p> Signup and view all the answers

    What type of teeth were covered with full-ceramic crowns in a study on fiber posts?

    <p>Anterior teeth</p> Signup and view all the answers

    Study Notes

    Fiber Posts

    • Originally, fiber posts consisted of carbon fibers embedded in epoxy resin, but quartz-fiber posts are now preferred.
    • Quartz-fiber posts have favorable mechanical properties, esthetic qualities, and can chemically bond to the polymer matrix.

    Mechanical Properties

    • The flexural strength of glass-, silica-, or quartz-fiber posts is approximately 1000 MPa.
    • The flexural modulus of glass-, silica-, or quartz-fiber posts is about 23 GPa.

    Radiopacity and Light Transmission

    • Current fiber posts are radiopaque.
    • They can also conduct light for polymerization of resin-based luting cements.
    • Light-transmitting posts result in better polymerization of resin composites in the apical area of simulated root canals, as measured by hardness values.

    Post/Core/Cement Interfaces

    • Physicochemical pretreatments such as silanization or sandblasting of the post surface can enhance bonding at the post/core/cement interfaces.
    • Silanization, hydrofluoric etching, and sandblasting (with 30 to 50 μm Al2O3) do not modify the mechanical properties of different glass-, silica-, or quartz-fiber posts.

    Bonding Fiber Posts to Root Canal Dentin

    • Bonding fiber posts to root canal dentin can improve the distribution of forces along the root, reducing the risk of root fracture and reinforcing the remaining tooth structure.
    • A retrospective study of 1306 fiber posts found a 3.2% failure rate after 1 to 6 years of recall.
    • A more recent study reported a 98.6% survival rate for parallel-sided fiber posts and a 96.8% survival rate for tapered fiber posts in anterior teeth covered with full-ceramic crowns after a mean observation period of 5.3 years.

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    Description

    This quiz covers the properties and characteristics of fiber posts used in dentistry, including their composition, mechanical properties, and esthetic qualities.

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