Posterior Composite Restorations Techniques
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Questions and Answers

What is one of the main functions of matricing in dental restoration?

  • To increase the thickness of the restoration.
  • To prevent dental caries.
  • To improve surface texture of composites. (correct)
  • To enhance the color of the restoration.

    • Which requirement is NOT essential for the matrices used in composite restoration?

  • Slightly flexible.
  • Thin.
  • Resin compatible.
  • Light transmittable. (correct)

    • Which of the following matrices is preferred over the Tofflemire matrix for posterior composites?

  • Circumferential matrix.
  • Sectional matrix. (correct)
  • Palodent system.
  • Automatic matrix.

    • What is the primary function of wedges in dental matricing?

    <p>Stabilize the matrix band. (C)</p> Signup and view all the answers

    Which type of matrix is described as a precontoured transparent matrix band?

    <p>Bioclear matrix. (D)</p> Signup and view all the answers

    Which characteristic of wooden wedges is emphasized in the context of dental restoration?

    <p>They provide better sealing than plastic ones. (B)</p> Signup and view all the answers

    What should the matrix be placed before in the process of dental restoration?

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

    What is one common disadvantage of using transparent matrices like Mylar strips?

    <p>They can cause gingival overhangs. (D)</p> Signup and view all the answers

    Why is it important for matrices to be resin compatible in dental restoration?

    <p>To prevent chemical reactions with the composite resin. (C)</p> Signup and view all the answers

    What role does smoothness of the matrix play in dental restorations?

    <p>It prevents the formation of rough surfaces on the restoration. (D)</p> Signup and view all the answers

    Which of the following best describes why sectional matrices are preferred over circumferential matrices?

    <p>They facilitate proper separation for tight contacts. (B)</p> Signup and view all the answers

    What is a disadvantage of using Mylar strips in dental restorations?

    <p>They can lead to flat open contacts and gingival overhangs. (D)</p> Signup and view all the answers

    Which type of matrix is specifically designed to be precontoured for better contact fitting?

    <p>Bioclear matrix (D)</p> Signup and view all the answers

    How do wooden wedges differ from plastic wedges in dental applications?

    <p>Wooden wedges swell to improve adaptation. (B)</p> Signup and view all the answers

    What is the primary reason for burnishing the matrix band against adjacent teeth?

    <p>To achieve a perfect contour for tight contact. (A)</p> Signup and view all the answers

    Which property is NOT a requirement for the matrices used in composite restorations?

    <p>Elastic and flexible (A)</p> Signup and view all the answers

    What does the conical light curing tip do in the context of dental restoration?

    <p>It helps achieve tight contact with the matrix band. (B)</p> Signup and view all the answers

    What is the primary function of wedging in the context of dental restorations?

    <p>To stabilize the matrix band and ensure tight contact. (B)</p> Signup and view all the answers

    The sectional matrix is considered preferable over the Tofflemire matrix due to its ability to provide proper separation.

    <p>True (A)</p> Signup and view all the answers

    The primary function of a wedging device is to enhance the strength of the matrix band.

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

    A matrix should be placed after etching and application of adhesive to ensure proper adhesion.

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

    Bioclear matrix is known for being a precontoured transparent matrix band.

    <p>True (A)</p> Signup and view all the answers

    Wooden wedges are preferred over plastic wedges because they do not absorb fluids.

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

    The primary characteristic required for a matrix is that it should be thick to prevent bleeding.

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

    It is necessary for matrices used in dental restorations to be light transmittable.

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

    Gingival overhangs can occur when using thick, non-precontoured matrices like Mylar strips.

    <p>True (A)</p> Signup and view all the answers

    Conical light curing tips are used to enhance the curing process by achieving tight contact.

    <p>True (A)</p> Signup and view all the answers

    Smoothness of the matrix surface aids in leaving a rough surface texture on composites.

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

    Flashcards

    Matrix Band

    A thin, contourable material used to protect the adjacent tooth and create proper shape and contour for the restoration, especially in posterior composite restorations.

    Wedge

    A small, wedge-shaped device placed between the tooth and matrix band to create proper separation and prevent overhangs.

    Burnishing

    The process of gently pressing the matrix band against the adjacent tooth with a burnisher to create a smooth, contoured surface.

    Circumferential Matrix

    A type of matrix band that encircles the tooth and is secured with a ring.

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    Sectional Matrix

    A type of matrix band that is split into sections and can be adjusted to fit the specific tooth.

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    Transparent Matrix (Mylar Strip)

    A type of matrix band made from a transparent material that allows light to pass through for curing composite.

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    Interproximal Space

    The distance between two adjacent teeth.

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    Bonding

    The process of applying a sealant or adhesive to the tooth surface before placing a restoration.

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    Matricing

    The process of using a matrix band and wedge to create proper shape, contour, and tight contact between the restoration and the adjacent tooth.

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    Transparent Matrix

    A matrix band made from a transparent material that allows light to pass through for curing composite.

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    Function of Wedging

    Used to stabilize the matrix band, separate teeth for tight contact, and prevent marginal overhangs.

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    Precontoured Matrix

    A matrix band that is pre-contoured to fit the adjacent tooth and promote proper contact.

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    Why wooden wedges are preferred

    Wooden wedges provide better sealing than plastic ones as they absorb any fluids with subsequent swelling and allow better adaptation.

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    Study Notes

    Matricing and Wedging for Posterior Composite Restorations

    • Functions of Matrices and Wedges:

      • Protect adjacent teeth from acid etching and bonding.
      • Establish proper shape and contour of the restoration.
      • Prevent marginal overhangs.
      • Increase restoration density and adaptation.
      • Prevent air-inhibition during polymerization at critical surface areas.
      • Improve surface texture of composites, leaving a smooth surface.
      • Protect gingival tissues from cavity margins.

    • Requirements of Matrix Materials:

      • Resin-compatible.
      • Thin.
      • Light transmittable (less critical, some texts suggest this is negligible).
      • Contourable for positive contact with non-condensable materials.
      • Smooth and rigid.
      • Satisfactory separation achieved by the ring.

    • Types of Posterior Composite Matrices:

      • Circumferential Matrices:
        • Tofflemire system
        • Ivory No. 8
        • Automatrix
        • Omni matrix
        • Blue soft matrix
      • Sectional Matrices:
        • Ivory No. 1
        • Tor VM system
        • Saddle matrix
        • Palodent/Garrison system
        • Bioclear matrix
      • Sectional matrices are often preferred over circumferential ones due to better separation and pre-contoured bands for precise contact.

    • Transparent Matrix (Mylar) Disadvantages:

      • Thick, not precontoured.
      • Results in flat open contacts and gingival overhangs.
      • Bioclear is an exception, a precontoured transparent matrix band.

    • Precontouring Matrices:

      • Essential for perfect contact with adjacent teeth.
      • Methods include burnishing the band against the adjacent tooth using a large ball burnisher.
      • Other methods include conical light curing tips, contact formers, or ceramic inserts.

    • Function of Wedging:

      • Stabilizes the matrix band.
      • Creates separation for tight contact (compensating for matrix thickness).
      • Prevents marginal overhangs. Wooden wedges are often preferred for their fluid absorption, preventing swelling and enhancing adaptation. Plastic wedges are less suitable.

    • Types of Wedges:

      • Wooden
      • Plastic
      • Flexi
      • Light reflecting
      • Double
      • Wave
      • Guard
      • ABC
      • Diamond

    • Customized Wedging (Liquidam):

      • Liquidam with a ring increases adaptation and acts as an individualized wedge.

    • Teflon Tape Use:

      • Protects adjacent teeth during restorative procedures.

    • Matrix Placement Timing:

      • Place the matrix before etching and adhesive application to protect the adjacent tooth.

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    Description

    This quiz covers the essential techniques of matcing and wedging for posterior composite restorations. Topics include the functions of matrices and wedges, requirements of matrix materials, and various types of matrices used in restorative dentistry. Test your knowledge on best practices and material selection in dental restorations.

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