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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