36 Questions
What are dental composites composed of?
Organic resin, 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
Which of the following is a type of resin used in dental composites?
Bis-GMA (Bowen’s resin), Dipentaerythritol pentaacrylate monophosphate, Urethane dimethacrylate (UDMA), Urethane tetramethacrylate
What are the components of the inorganic phase in dental composites?
Inorganic filler particles, organic matrix, coupling agent
What is the role of the coupling agent in dental composites?
To bond the organic and inorganic phases
Which material can lead to undesirable situations if the organic matrix phase is not polymerized sufficiently?
Resins
What is the purpose of ultraviolet absorbers, like benzophenone, in composite restorative materials?
To prevent discoloration and act as a 'sunscreen' to composites
What effect do inhibitors, like butylated hydroxyl toluene, have on composite restorative materials?
To inhibit the free radicals generated by spontaneous polymerization of the monomers
What is the role of silane coupling phase in composite restorative materials?
To provide bonding between the organic polymer matrix and the inorganic phase, enhancing the composite's properties
What can be done to reduce the coefficient of thermal expansion of composites?
Increasing filler content
What determines the smoothness of the surface of a composite restoration?
Size and composition of filler particles
What influences the wear resistance of composites?
Filler particle size, quantity, and site of restorations in dental arch and occlusal contact relationship
What is the recommended lighting condition for shade matching during composite restorations?
Natural daylight with wet teeth and shade guide
Which method is crucial for preventing moisture and salivary contamination during composite restoration?
Isolation
What is involved in tooth preparation for direct composite restorations?
Roughening the tooth surface and may include enamel bevel
How can composites be bonded to tooth structure?
Total-etch or self-etch methods
What technique is advocated for use in medium to large posterior composite restorations?
Incremental layering technique
What does the horizontal technique involve in composite restorations?
Occlusogingival layering and is indicated for small restorations
What affects the polymerization shrinkage of composites?
Composite thickness, soft-start polymerization, and C-factor
What can occur due to polymerization shrinkage, poor adhesion, and incomplete resin infiltration?
Microleakage and nanoleakage
What directly impacts the strength of the resin in composites?
Degree of conversion
What is the recommended distance between the light source and resin for optimal polymerization?
1 mm
What can affect the polymerization of the resin in composites?
Resin thickness and the presence of air
What should be the angle of the light source to the resin for optimal polymerization?
90°
What is the power density required to ensure 400 mW/cm reaches the first restoration increment?
600 mW/cm
What are the contraindications for composite restorations?
Wide posterior restorations, difficult operating field isolation, and high occlusal forces
Who developed composite resins and in which year?
Dr. Rafeal Bowen in 1960
What are the advantages of composites?
Minimal tooth preparation, esthetic acceptability, and bonding directly to the tooth
What does shade selection depend on in composite restorations?
Position of the tooth preparation and esthetic requirements
What clinical procedures are involved in composite restorations?
Local anesthesia, site preparation, composite and shade selection, isolation, bonding, and final contouring
What is the indication for composite restorations?
Repair of fractured ceramic crowns
What is a disadvantage of composite restorations?
Polymerization shrinkage
Who developed composite resins and in which year?
Dr. Rafeal Bowen in 1960
What is a critical factor in shade selection for composite restorations?
Complexity of the restoration
What is required to ensure 400 mW/cm reaches the first restoration increment?
A power density of 600 mW/cm
What are the contraindications for composite restorations?
Wide posterior restorations
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.
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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