Dental Composites
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Questions and Answers

What are dental composites composed of?

  • Organic resin, inorganic matrix, coupling agent, activator-initiator system, inhibitors, coloring agents (correct)
  • Organic resin, inorganic phase, coupling agent, activator-initiator system, inhibitors, coloring agents
  • Organic phase, inorganic phase, coupling agent, activator-initiator system, inhibitors, coloring agents
  • Organic matrix, inorganic matrix, coupling agent, activator-initiator system, inhibitors, coloring agents

    • What can occur when the organic matrix phase is not polymerized sufficiently?

  • Allergic reaction, cytotoxicity, volumetric shrinkage (correct)
  • Allergic reaction, biocompatibility, volumetric shrinkage
  • Allergic reaction, cytotoxicity, biocompatibility
  • Allergic reaction, cytotoxicity, color change

    • Which of the following is a type of resin used in dental composites?

  • Bis-GMA (Bowen’s resin), Polymethyl methacrylate (PMMA), Urethane dimethacrylate (UDMA), Triethylene glycol dimethacrylate
  • Bis-GMA (Bowen’s resin), Dipentaerythritol pentaacrylate monophosphate, Polymethyl methacrylate (PMMA), Urethane dimethacrylate (UDMA)
  • Bis-GMA (Bowen’s resin), Dipentaerythritol pentaacrylate monophosphate, Urethane dimethacrylate (UDMA), Urethane tetramethacrylate (correct)
  • Bis-GMA (Bowen’s resin), Polymethyl methacrylate (PMMA), Urethane dimethacrylate (UDMA), Urethane tetramethacrylate

    • What are the components of the inorganic phase in dental composites?

    <p>Inorganic filler particles, organic matrix, coupling agent</p> Signup and view all the answers

    What is the role of the coupling agent in dental composites?

    <p>To bond the organic and inorganic phases</p> Signup and view all the answers

    Which material can lead to undesirable situations if the organic matrix phase is not polymerized sufficiently?

    <p>Resins</p> Signup and view all the answers

    What is the purpose of ultraviolet absorbers, like benzophenone, in composite restorative materials?

    <p>To prevent discoloration and act as a 'sunscreen' to composites</p> Signup and view all the answers

    What effect do inhibitors, like butylated hydroxyl toluene, have on composite restorative materials?

    <p>To inhibit the free radicals generated by spontaneous polymerization of the monomers</p> Signup and view all the answers

    What is the role of silane coupling phase in composite restorative materials?

    <p>To provide bonding between the organic polymer matrix and the inorganic phase, enhancing the composite's properties</p> Signup and view all the answers

    What can be done to reduce the coefficient of thermal expansion of composites?

    <p>Increasing filler content</p> Signup and view all the answers

    What determines the smoothness of the surface of a composite restoration?

    <p>Size and composition of filler particles</p> Signup and view all the answers

    What influences the wear resistance of composites?

    <p>Filler particle size, quantity, and site of restorations in dental arch and occlusal contact relationship</p> Signup and view all the answers

    What is the recommended lighting condition for shade matching during composite restorations?

    <p>Natural daylight with wet teeth and shade guide</p> Signup and view all the answers

    Which method is crucial for preventing moisture and salivary contamination during composite restoration?

    <p>Isolation</p> Signup and view all the answers

    What is involved in tooth preparation for direct composite restorations?

    <p>Roughening the tooth surface and may include enamel bevel</p> Signup and view all the answers

    How can composites be bonded to tooth structure?

    <p>Total-etch or self-etch methods</p> Signup and view all the answers

    What technique is advocated for use in medium to large posterior composite restorations?

    <p>Incremental layering technique</p> Signup and view all the answers

    What does the horizontal technique involve in composite restorations?

    <p>Occlusogingival layering and is indicated for small restorations</p> Signup and view all the answers

    What affects the polymerization shrinkage of composites?

    <p>Composite thickness, soft-start polymerization, and C-factor</p> Signup and view all the answers

    What can occur due to polymerization shrinkage, poor adhesion, and incomplete resin infiltration?

    <p>Microleakage and nanoleakage</p> Signup and view all the answers

    What directly impacts the strength of the resin in composites?

    <p>Degree of conversion</p> Signup and view all the answers

    What is the recommended distance between the light source and resin for optimal polymerization?

    <p>1 mm</p> Signup and view all the answers

    What can affect the polymerization of the resin in composites?

    <p>Resin thickness and the presence of air</p> Signup and view all the answers

    What should be the angle of the light source to the resin for optimal polymerization?

    <p>90°</p> Signup and view all the answers

    What is the power density required to ensure 400 mW/cm reaches the first restoration increment?

    <p>600 mW/cm</p> Signup and view all the answers

    What are the contraindications for composite restorations?

    <p>Wide posterior restorations, difficult operating field isolation, and high occlusal forces</p> Signup and view all the answers

    Who developed composite resins and in which year?

    <p>Dr. Rafeal Bowen in 1960</p> Signup and view all the answers

    What are the advantages of composites?

    <p>Minimal tooth preparation, esthetic acceptability, and bonding directly to the tooth</p> Signup and view all the answers

    What does shade selection depend on in composite restorations?

    <p>Position of the tooth preparation and esthetic requirements</p> Signup and view all the answers

    What clinical procedures are involved in composite restorations?

    <p>Local anesthesia, site preparation, composite and shade selection, isolation, bonding, and final contouring</p> Signup and view all the answers

    What is the indication for composite restorations?

    <p>Repair of fractured ceramic crowns</p> Signup and view all the answers

    What is a disadvantage of composite restorations?

    <p>Polymerization shrinkage</p> Signup and view all the answers

    Who developed composite resins and in which year?

    <p>Dr. Rafeal Bowen in 1960</p> Signup and view all the answers

    What is a critical factor in shade selection for composite restorations?

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

    What is required to ensure 400 mW/cm reaches the first restoration increment?

    <p>A power density of 600 mW/cm</p> Signup and view all the answers

    What are the contraindications for composite restorations?

    <p>Wide posterior restorations</p> Signup and view all the answers

    Study Notes

    Composite Restorations: Indications, Contraindications, Advantages, and Disadvantages

    • To ensure 400 mW/cm reaches the first restoration increment, a power density of 600 mW/cm is required
    • Indications for composite restorations include mild to moderate class I and II tooth preparations, esthetic improvements, and repair of fractured ceramic crowns
    • Contraindications for composite restorations are wide posterior restorations, difficult operating field isolation, and high occlusal forces
    • Advantages of composites include minimal tooth preparation, esthetic acceptability, and bonding directly to the tooth
    • Disadvantages of composites include polymerization shrinkage, postoperative sensitivity, and higher cost compared to amalgam
    • Composite resins were developed by Dr. Rafeal Bowen in 1960
    • Clinical procedures for composite restorations involve local anesthesia, site preparation, composite and shade selection, isolation, bonding, and final contouring
    • Composite selection depends on the position of the tooth preparation and esthetic requirements
    • Shade selection is critical for anterior restorations and depends on the complexity of the restoration and the relationship with adjacent teeth
    • The number of shades used depends on the complexity of the restoration and the polychromatic characteristics of the tooth
    • Local anesthesia is given as needed for pleasant and time-saving procedures
    • Operating site is cleaned using pumice slurry to remove plaque, calculus, and superficial stains before the procedure.

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    Related Documents

    Restorative Composite Materials 2023-24 PDF

    Description

    Test your knowledge of dental composites with this quiz covering key points to consider when working with composite restorations. Explore indications, contraindications, advantages, disadvantages, and essential factors affecting polymerization and curing of dental composites.

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