Dental Restoration Techniques
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What is the primary purpose of ensuring interproximal clearance when positioning a matrix band?

  • To minimize the total time required for the procedure.
  • To allow the easy insertion of restorative materials.
  • To increase the aesthetic appearance of the restoration.
  • To facilitate the passive positioning of the matrix. (correct)

    • Which matrix band should be selected if the distance between the cervical cavity margin and the adjacent tooth is approximately ±0.7 mm?

  • BioFit matrix (Bioclear Matrix Systems)
  • Sectional matrix band (TORVM)
  • Saddle matrix (TORVM) (correct)
  • Perforated matrix (TOR VM) (correct)

    • What is the correct height for positioning a matrix band above the marginal ridge of the adjacent tooth?

  • ±0.5 mm (correct)
  • ±1.0 mm
  • ±0.3 mm
  • ±0.7 mm

    • What could be a consequence of positioning the matrix band too high during a restoration procedure?

    <p>Need for excessive grinding in the occlusion. (D)</p> Signup and view all the answers

    When is the usage of a BioFit matrix (Bioclear Matrix Systems) indicated?

    <p>For interdental distances of ±0.9 mm. (D)</p> Signup and view all the answers

    What is the consequence of forcing a matrix band into an interproximal space without interproximal clearance?

    <p>The matrix may become deformed. (C)</p> Signup and view all the answers

    When selecting a sectional matrix band (TORVM), what is the optimal space between the cervical cavity margin and the adjacent tooth?

    <p>±0.5 mm (D)</p> Signup and view all the answers

    What happens if the matrix band is positioned too short above the marginal ridge of the adjacent tooth?

    <p>It may bond to a restoration on the adjacent tooth. (C)</p> Signup and view all the answers

    Which matrix type is preferred when the interdental distance is approximately ±0.9 mm?

    <p>BioFit matrix (Bioclear Matrix Systems) (C)</p> Signup and view all the answers

    What is the appropriate height for a matrix band above the occlusal margin to achieve correct contour?

    <p>±0.5 mm above the marginal ridge (D)</p> Signup and view all the answers

    Interproximal clearance allows for the accessible positioning of the matrix band.

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

    A BioFit matrix should be selected when the interdental distance is approximately ±0.5 mm.

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

    If the matrix band is inserted too low, it risks overlapping the marginal ridge of the adjacent tooth.

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

    The saddle matrix band is preferred for interproximal spaces of around ±0.9 mm.

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

    Forcing the matrix band without interproximal clearance does not affect the restoration process.

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

    Interproximal clearance is only important for aesthetic purposes during restoration.

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

    A sectional matrix band (TORVM) is selected for interproximal spaces measuring approximately ±0.5 mm.

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

    If the matrix band is positioned too high, it may require more time to adjust the occlusion.

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

    The height of the matrix band should be positioned approximately ±0.7 mm below the marginal ridge of the adjacent tooth.

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

    A saddle matrix is selected when the distance between the cervical cavity margin and the adjacent tooth is around ±0.7 mm.

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

    What is the recommended approach for applying the matrix and ring when restoring a MOD cavity?

    <p>Apply the matrix and ring at one location, then restore that area before applying a second ring. (C)</p> Signup and view all the answers

    In moderately deep cavities, why is a layer of flowable composite recommended under packable composites?

    <p>It increases adaptation and absorbs stresses. (B)</p> Signup and view all the answers

    What technique involves using resin modified glass ionomer under composite materials for better cavity restoration?

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

    What condition necessitates the use of pulp capping materials during cavity restoration?

    <p>Very deep cavities that approach the pulp. (B)</p> Signup and view all the answers

    What effect does placing the two rings simultaneously both mesially and distally have on the restoration?

    <p>It results in separation in the opposite direction, diminishing the effect at the contact area. (C)</p> Signup and view all the answers

    What role does the interproximal clearance play in the placement of a matrix band?

    <p>It allows for proper polishing of the restoration margins. (C)</p> Signup and view all the answers

    Which feature of the matrix band is critical for effective positioning in relation to the adjacent tooth?

    <p>The band must have a height of approximately ±0.5 mm above the marginal ridge. (A)</p> Signup and view all the answers

    What can result from improper stabilization of the matrix band during the restoration process?

    <p>Compromised fit to the cavity margins. (A)</p> Signup and view all the answers

    Which type of matrix band is appropriate for an interdental distance of approximately ±0.9 mm?

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

    Which matrix band type would you select when the distance between the cervical cavity margin and the adjacent tooth is about ±0.5 mm?

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

    What is a common consequence of positioning a matrix band too high during the restoration procedure?

    <p>Time required for further occlusal adjustments. (B)</p> Signup and view all the answers

    When using a BioFit matrix (Bioclear Matrix Systems), which area is included within its structure?

    <p>The occlusal embrasure (C)</p> Signup and view all the answers

    How should a matrix band be positioned to achieve the correct contact area in a bucco-lingual direction?

    <p>Centered bucco-lingually. (A)</p> Signup and view all the answers

    Simultaneous placement of two rings both mesially and distally enhances their effect at the contact area.

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

    In very deep cavities, pulp capping materials are used to protect the pulp.

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

    Using a layer of flowable composite under packable composites is recommended to improve adaptation and absorb stresses.

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

    Resin modified glass ionomer is not suitable for use under composite materials for cavity restoration.

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

    A hydrophobic layer improves the adaptation of materials to dentin in moderately deep cavities.

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

    Interproximal clearance allows the matrix band to be positioned with ease and prevents deformation.

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

    A sectional matrix band (TORVM) is selected when the space between the cervical cavity margin and the adjacent tooth is approximately ±0.9 mm.

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

    If the occlusal embrasure is in the correct position, the dentist can maintain good control with the matrix band.

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

    Forcing a matrix band into an interproximal space is beneficial for the restoration process.

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

    A saddle matrix band is the preferred choice for interproximal spaces of around ±0.5 mm.

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

    Stabilization of the matrix band can be achieved using methods such as wedges and separation rings.

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

    An incorrectly positioned matrix band can potentially bond to an existing composite restoration of an adjacent tooth.

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

    The matrix band should be positioned approximately ±0.5 mm below the marginal ridge of the adjacent tooth for proper contouring.

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

    What is recommended for the application of an adhesive system to enamel?

    <p>Use an etch &amp; rinse adhesive (A)</p> Signup and view all the answers

    What is the optimal procedure for curing the adhesive layer before applying resin composite?

    <p>Cure the adhesive layer before the application of resin composite (C)</p> Signup and view all the answers

    Which of the following is NOT a precaution during adhesive application?

    <p>Avoid excessive layering of adhesive (D)</p> Signup and view all the answers

    What effect does oxygen have on the polymerization of the adhesive layer?

    <p>Inhibits polymerization of the top 15 microns (A)</p> Signup and view all the answers

    When is selective etching indicated in the adhesive application process?

    <p>With universal adhesives for enamel margins (D)</p> Signup and view all the answers

    What is the function of tools like Comporoller and Optra Sculpt during resin composite packing?

    <p>To pack and shape composite effectively (C)</p> Signup and view all the answers

    What technique should be used to enhance the adaptation of resin composite during packing?

    <p>Drag composites towards the walls before curing (A)</p> Signup and view all the answers

    Why is it important to wash the etching area after applying an adhesive?

    <p>To remove any residual etching gel (C)</p> Signup and view all the answers

    The self etch approach is recommended for enamel application of adhesive systems.

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

    Applying two layers of adhesive is preferable to ensure adequate bonding.

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

    Oxygen prevents polymerization in the top 15 microns of the adhesive layer.

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

    Brush thinning is the preferred method for spreading the adhesive layer over air thinning.

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

    Proper light curing of the adhesive requires low intensity to avoid complications.

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

    A Teflon instrument is recommended to prevent sticking when packing resin composite.

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

    The technique for applying adhesive in enamel involves a wet application without needing a drying period.

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

    Comporoller is designed to apply vibration on composite during packing to enhance adaptation.

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

    Study Notes

    Interproximal Clearance

    • Interproximal clearance allows access to the buccal and lingual margins for the restoration area.
    • This enables passive matrix band placement, preventing deformation.
    • Accessible margins facilitate finishing, polishing, and repolishing of restoration margins.
    • Insufficient clearance deforms matrix band; buccal and lingual margin access is vital for sufficient clearance.
    • Forcing a matrix band without clearance leads to deformation.
    • Interproximal clearance means buccal and lingual margins of the restoration area are accessible.
    • Interproximal clearance allows passive matrix positioning.

    Matrix Band Selection

    • Distance from the cervical cavity margin to the adjacent tooth determines matrix band selection.
    • ±0.5 mm interproximal spaces use sectional matrix bands (TORVM).
    • ±0.7 mm spaces use saddle or perforated matrix bands (TORVM).
    • ±0.9 mm interdental distances require a BioFit matrix (Bioclear Matrix Systems).
    • These three types are suitable for 90% of Class II restorations.

    Matrix Band Positioning

    • Matrix band smooth insertion into the interproximal space (free axis of insertion).
    • Matrix band height should be ≈ ±0.5 mm above adjacent tooth's marginal ridge for proper contour.
    • Excessive height necessitates occlusal adjustments; a short band risks overlap or bonding with adjacent restorations.
    • A BioFit matrix includes the occlusal embrasure in the band.
    • Correct height ensures dentist control, provided occlusal embrasure is correctly positioned.
    • Band insertion without friction (free axis of insertion).
    • Too high a band requires occlusal adjustments; a too short band risks overlap or bonding.
    • Band centering bucco-lingually aligns the contact area.

    Stabilization of the Matrix Band

    • Stabilization techniques include wedges, separation rings, Teflon tape, and flowable block-out resin.
    • For MOD cavities, apply matrix and ring to one contact area, restore, remove, then repeat for the other contact area.
    • Simultaneous mesial and distal placement reduces the effect at contact areas.

    Liner/Base Application

    • Moderately deep cavities: Flowable composite under packable composites increases adaptation and stress absorption (elastic wall concept). The flowable composite acts as a hydrophobic layer for better adaptation between hydrophilic dentin and hydrophobic composite.
    • Resin modified glass ionomer under composite (sandwich technique) is an alternative.
    • Very deep cavities: Pulp capping materials can be used to cap the pulp.

    Adhesive System Application

    • Select the adhesive system, strictly following the manufacturer's instructions.

    • For enamel, use etch & rinse adhesive; it creates a chalky white appearance.

    • For dentin, use a self-etch approach.

    • Universal adhesive is optimal for both enamel and dentin but needs pre-etching for enamel margins (selective etch technique).

    • Apply the adhesive with a brush or light air-thinning.

    • Cure the adhesive layer before applying resin composite.

    • Oxygen inhibits polymerization; the top 15 microns of the adhesive won't polymerize, providing insufficient chemical co-polymerization with the resin composite.

    • Precautions:

      • Pre-etch enamel margins with universal adhesive (selective etch technique) for 30 seconds.
      • Washing time should equal or double the etching time.
      • Allow at least 10 seconds after primer application for collagen re-expansion and solvent evaporation.
      • Apply ample or multiple adhesive layers.
      • Apply actively with brushing.
      • Brush thinning is preferred over air thinning.
      • Properly cure the adhesive with sufficient light intensity.

    Resin Composite Packing

    • Composite is typically supplied in tubes or compules.
    • Inject composite into the cavity using syringes.
    • Use Teflon or gold-plated packing instruments to prevent sticking.
    • Instruments with exchangeable rubber tips (e.g., Comporoller, Optra Sculpt) help with packing and shaping.
    • Compothixo applies vibration to the composite for improved adaptation.
    • Use fine painting brushes for composite application (avoid cheap brushes, as fallen bristles contaminate the composite).
    • Drag composite towards the cavity walls and margins before curing for enhanced adaptation.

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    Description

    This quiz covers key concepts related to interproximal clearance, matrix band selection, and positioning in dental restorations. Understanding these elements is essential for effective restoration and finishing procedures. Test your knowledge on the various types of matrix bands and their appropriate applications.

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