Dental Restorations Overview
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What is a major advantage of ceramic restorations over metallic restorations?

  • Better color blending with adjacent tooth structure (correct)
  • Greater risk of plaque accumulation
  • Increased likelihood of fracture
  • Higher thermal conductivity

    • What does the bonding process in ceramic restorations increase?

  • Plaque accumulation
  • Fracture resistance (correct)
  • Need for more appointments
  • Thermal sensitivity

    • Which of the following is a contraindication for ceramic restorations?

  • Evidence of para-functional habits (correct)
  • The need for color blending
  • Extensive tooth involvement
  • Presence of metal allergies

    • What is a requirement for the preparation design of ceramic restorations?

    <p>Homogenous thickness of 1.5-2.5mm</p> Signup and view all the answers

    What is a significant disadvantage of ceramic restorations?

    <p>Need for special attention to marginal adaptation</p> Signup and view all the answers

    What factor increases the time and cost involved in ceramic restorations?

    <p>Laboratory fees and number of appointments</p> Signup and view all the answers

    Why are older porcelain restorations considered unsuccessful?

    <p>Lack of reinforcing systems</p> Signup and view all the answers

    What characteristic of ceramics could potentially wear opposing teeth?

    <p>Surface stain properties</p> Signup and view all the answers

    What is the recommended cavo-surface margin for occlusal preparations?

    <p>Hollow-ground chamfer bevel or butt joint</p> Signup and view all the answers

    Which of the following is a key advantage of the hollow-ground bevel over the butt joint?

    <p>Better color blending and seal</p> Signup and view all the answers

    What is the significance of rounding internal line angles in dental preparations?

    <p>It prevents stress concentration</p> Signup and view all the answers

    Which process can help reduce polymerization shrinkage in indirect resin composite restorations?

    <p>Curing the material outside the mouth</p> Signup and view all the answers

    What is one of the main advantages of using resin composite inlays over direct composite resin?

    <p>Improved marginal adaptation</p> Signup and view all the answers

    What is the benefit of post-curing resin composite restorations?

    <p>Improves strength properties</p> Signup and view all the answers

    How does the cost of indirect resin composite restorations compare to that of ceramic restorations?

    <p>Lower if done in clinic due to no lab fees</p> Signup and view all the answers

    What is an advantage of using resin composite materials in clinical settings?

    <p>Feasibility of occlusal adjustment</p> Signup and view all the answers

    What is the ideal angle for burnishable metal according to the provided specifications?

    <p>40 degrees</p> Signup and view all the answers

    What is one recommendation if the outline form exceeds one third of the intercuspal distance?

    <p>Recommend an onlay</p> Signup and view all the answers

    What factor does NOT contribute to increasing axial retention in restorations?

    <p>Color of the restoration material</p> Signup and view all the answers

    Which statement correctly describes the relationship between resistance and restoration materials?

    <p>Resistance is less critical for brittle materials than for cast gold.</p> Signup and view all the answers

    What can be used to enhance retention in the proximal part of a restoration?

    <p>Secondary flares</p> Signup and view all the answers

    What can happen if thin sections of a restoration are subjected to occlusal forces?

    <p>They can lead to open margins</p> Signup and view all the answers

    Why is a beveled axio-pulpal line angle important?

    <p>It prevents warping of the handling wax pattern.</p> Signup and view all the answers

    What has led to the increased use of tooth-colored restorative materials in posterior teeth?

    <p>Patient demand for aesthetics</p> Signup and view all the answers

    What is the primary characteristic of inlays?

    <p>They involve occlusal and proximal surface(s) of posterior tooth.</p> Signup and view all the answers

    Which of the following is a disadvantage of cast gold restorations?

    <p>They can cause thermal sensitivity.</p> Signup and view all the answers

    What are metallic restorations primarily made from?

    <p>Different types of metal alloys.</p> Signup and view all the answers

    In which situation is a cast gold restoration indicated?

    <p>For restoring badly broken-down teeth.</p> Signup and view all the answers

    What is a key feature of non-metallic restorations?

    <p>They are designed to be esthetically pleasing.</p> Signup and view all the answers

    What is one of the main disadvantages of cast gold restorations?

    <p>They can have a high cost and require multiple appointments.</p> Signup and view all the answers

    Which of the following indicates a contraindication for cast gold restorations?

    <p>Highly esthetically sensitive areas.</p> Signup and view all the answers

    Which characteristic does NOT apply to cast gold restorations?

    <p>They are inexpensive to produce.</p> Signup and view all the answers

    What is the correct angle range for the occlusal divergence of internal cavity walls in cavity preparation?

    <p>3-50 degrees</p> Signup and view all the answers

    Why should the cavo-surface margin be beveled during cavity preparation?

    <p>To prevent the exposure of cement line</p> Signup and view all the answers

    What is the primary purpose of secondary flares in occluso-proximal cavity preparation?

    <p>To make margins more self-cleansable</p> Signup and view all the answers

    Which of the following statements about internal line angles in cavity preparation is accurate?

    <p>They must be well defined but not sharp</p> Signup and view all the answers

    How should the external walls be oriented in relation to the tooth contour during cavity preparation?

    <p>They should align with the horizontal plane</p> Signup and view all the answers

    What is the recommended degree and width of the bevel trimmed for the gingival seat cavo-surface margin?

    <p>30 degrees, 0.5-1 mm width</p> Signup and view all the answers

    What is the characteristic of an obtuse angled marginal tooth structure resulting from secondary flares?

    <p>Blunt and stronger enamel margin</p> Signup and view all the answers

    Which of the following describes the angle of the marginal metal alloy created by the secondary flares?

    <p>30-40 degrees</p> Signup and view all the answers

    Study Notes

    Indirect Restorations

    • Inlays and onlays are indirect restorations
    • Inlays affect the occlusal and proximal tooth surfaces
    • Onlays can be partial (one cusp) or complete (all cusps)
    • They are made of either metallic or non-metallic materials

    Metallic Restorations

    • Can be made from various alloys
    • Examples include cast gold alloys (especially type III), low gold alloys, base metal alloys, nickel-chrome, and titanium alloys

    Non-Metallic Restorations

    • Made from ceramic materials or post-cured resin composite materials.
    • Often called tooth-colored restorations

    Cast Gold Restorations

    • A precise metallic duplicate of the prepared cavity
    • Fabricated outside the mouth and cemented in place as a single piece
    • Restores lost tooth structure
    • Advantages include:
      • Indestructibility in oral fluids (insoluble and highly resistant to tarnish and corrosion)
      • High strength properties
      • Dimensional stability

    Disadvantages of Cast Gold Restorations

    • Inharmonious color
    • Limited adaptability to cavity walls and margins due to the cement line
    • Less retention
    • High thermal conductivity
    • Quality dependent on lab work
    • Number of appointments and time
    • Indications include extensive tooth involvement (badly broken-down teeth, teeth where cusps increase their tendency to split, cracked or crazed teeth, or endodontically treated teeth)

    Design of Cavity Preparation

    • All previously mentioned fundamentals are respected
    • Final cavity design has different features compared to direct metallic restorations
    • Differences are listed regarding each step

    Outline Form

    • Internal cavity walls are uniformly tapered occlusally with a 3-50 degree taper
    • Cavity's external outline is wider than internal outline
    • Cavo-surface margin should be beveled
    • Gingival seat cavo-surface margin should be trimmed creating a short bevel (30-degree angle and 0.5-1mm width)
    • All internal line angles should be defined but not sharp
    • Axial and external walls follow tooth contour
    • Occluso-proximal cavity preparation often has primary flares accompanied with secondary flares
    • Secondary flares extend from facio- or linguo-axial line angle into facial or lingual embrasure in two planes

    Additional Considerations

    • Extends margins into embrasures for easier cleaning
    • Provides flexible arms for restoration retention
    • Creates obtuse angled marginal structure (140-150 degrees)
    • Creates acute angled marginal metal alloy (30-40 degrees)
    • Reduces internal space errors
    • Cast gold restorations have high strength properties
    • Cavity preparation margins should make a smooth butt-joint or hollow-ground chamfer bevel
    • Internal line angles should be rounded
    • Occlusal cavo-surface margin should not be beveled
    • Ceramic restorations should be fitted using intraoral or cast methods

    Ceramic Restorations

    • Increasing esthetic demands have led to more frequent use of tooth-colored restorations in posterior teeth
    • Problems with old porcelain included weakness, marginal integrity, and lack of adequate cementing medium
    • Modern developments allow etching and bonding to underlying tooth, making them more successful
    • Advantages over metallic restorations:
      • Color blending with adjacent tooth structure
      • Low plaque accumulation
      • Lower thermal diffusivity (reducing thermal sensitivity)
      • Increased fracture resistance from bonding
    • Disadvantages:
      • Technique-sensitive (requiring more time and attention)
      • Probability of fracture during try-in phase and potential wear of opposing tooth
      • Marginal adaptation needs special attention, as well as occlusal adjustment

    Contraindications

    • High plaque and caries index
    • Developing or deciduous teeth
    • Compromised patient
    • Esthetically sensitive areas

    Additional Considerations

    • Indirect resin composite restorations: Can be fabricated intraorally or on a cast
    • Advantages over direct composite restorations: Reduced polymerization shrinkage, better control of contact and contours, better marginal adaptation, increased strength.
    • Disadvantages over ceramic restorations: Reliable chemical bonding is less reliable and certain tooth structure is required to be removed from the prep
    • Disadvantages over direct composite restorations include increased polymerization shrinkage, issues with marginal gap, cuspal flexure and craze lines
    • The cavity preparation and fabrication are detailed for both composite and ceramic restorations

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    Related Documents

    Indirect Restorations PDF

    Description

    This quiz covers various types of dental restorations, including indirect restorations like inlays and onlays, as well as both metallic and non-metallic materials used in these procedures. It also highlights the advantages and disadvantages of cast gold restorations. Test your knowledge on the materials and techniques used in restorative dentistry.

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