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 (C)</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 (D)</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 (D)</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 (B)</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 (A)</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 (A)</p> Signup and view all the answers

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

<p>Increasing filler content (C)</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 (A)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>Isolation (C)</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 (C)</p> Signup and view all the answers

How can composites be bonded to tooth structure?

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

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

<p>Incremental layering technique (B)</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 (A)</p> Signup and view all the answers

What affects the polymerization shrinkage of composites?

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

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

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

What directly impacts the strength of the resin in composites?

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

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

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

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

<p>90° (B)</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 (D)</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 (A)</p> Signup and view all the answers

Who developed composite resins and in which year?

<p>Dr. Rafeal Bowen in 1960 (C)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

What is the indication for composite restorations?

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

What is a disadvantage of composite restorations?

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

Who developed composite resins and in which year?

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

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

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

What are the contraindications for composite restorations?

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

Flashcards

Dental Composite Composition

Dental composites are composed of organic resin, inorganic filler particles, a coupling agent, and other additives like activators, inhibitors, and colorants.

Insufficient Polymerization

If the organic matrix in a dental composite isn't fully polymerized, it can lead to problems like allergic reactions, cytotoxicity, and shrinkage.

Resin Types in Composites

Common types of resin used in dental composites include Bis-GMA, UDMA, and TEGDMA.

Inorganic Filler Role

Inorganic filler particles in dental composites contribute to strength, durability, and esthetics.

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Coupling Agent Function

The coupling agent in dental composites bonds the organic polymer matrix to the inorganic filler particles, improving the composite's properties.

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Organic Matrix Polymerization Issues

Problems arise if the organic matrix isn't polymerized enough, potentially leading to adverse effects.

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Ultraviolet Absorbers' Role

Ultraviolet (UV) absorbers like benzophenone prevent discoloration and protect the composite from UV light damage.

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Inhibitor Function

Inhibitors like butylated hydroxytoluene (BHT) prevent the unwanted effects of free radicals during composite polymerization.

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Silane Coupling Phase

Silane coupling agents improve bonding between organic and inorganic components in dental composites, enhancing their properties.

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Coefficient of Thermal Expansion

Increasing the filler content reduces the coefficient of thermal expansion (CTE) in dental composites.

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Composite Surface Smoothness

The size and composition of filler particles in dental composites influence the smoothness of the restoration surface.

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Composite Wear Resistance

Composite wear resistance is influenced by the size and amount of filler particles and where the restoration is in the mouth.

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Shade Matching Lighting

Match shades in natural daylight with wet teeth and a shade guide for accuracy.

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Moisture Control

Prevent moisture contamination during composite restorations for proper bonding.

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Tooth Preparation

Tooth preparation involves roughening the surface for proper composite bonding.

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Composite Bonding Methods

Bonding composites to teeth uses total-etch or self-etch techniques, depending on the application.

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Incremental Layering

The recommended technique for medium-to-large posterior composites is the incremental layering technique.

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Horizontal Layering Technique

The occluso-gingival layering method is used in small composite restorations.

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Polymerization Shrinkage Factors

Composite thickness, soft-start polymerization, and the C-factor influence composite shrinkage during polymerization.

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Microleakage/Nanoleakage Causes

Microleakage and nanoleakage result from polymerization shrinkage, poor adhesion, and resin infiltration.

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Resin Strength

The degree of conversion directly affects the strength of the resin in composites.

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Light Source Distance for Polymerization

For optimal composite polymerization, position the light source approximately 1 mm from the resin.

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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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