Questions and Answers
What are some advantages of composite as a Class I and II direct restorative material? (Select all that apply)
Which of the following are disadvantages of Class I and II direct composite restorations? (Select all that apply)
What are the indications for composite restoration? (Select all that apply)
Which of the following are contra-indications for composite restoration? (Select all that apply)
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What does the GV Black classification refer to?
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Tooth preparation principles include creating access to the faulty structure and ______.
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What type of bur creates a thick smear layer?
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What characterizes small to moderate Class I preparations?
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What should the preparation for moderate to large Class I never excessively extend beyond?
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You need to bevel the occlusal surface for composite restorations.
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What is composite made of?
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What does the inorganic filler in composite material do?
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How is the bond formed between organic resin matrix and inorganic filler in composite material?
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How are composites classified?
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What is the LCTE of modern composites?
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What does the C factor of composites refer to?
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What does LCTE stand for?
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What are the composite curing methods?
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Study Notes
Advantages of Composite Material
- Offers esthetic appeal, matching natural tooth color.
- Preservation of more tooth structure, making it less invasive.
- Simpler tooth preparations compared to other materials.
- Low thermal conductivity, serving as an insulator.
- Universally applicable in various dental restorations.
- Provides a strong bond to tooth structure.
- Can be repaired if damaged.
Disadvantages of Composite Material
- Susceptible to gap formation, particularly on root surfaces due to polymerization shrinkage.
- Restoration process can be time-consuming and more expensive.
- High level of technique sensitivity required for effective application.
- May show increased occlusal wear under high stress conditions.
Indications for Composite Restoration
- Suitable for Class I to Class VI restorations.
- Used for core buildups and sealants.
- Ideal for preventive resin restorations, known as conservative composite restorations.
- Appropriate for esthetic procedures and temporary restorations.
- Can be utilized in periodontal splinting.
Contraindications for Composite Restoration
- Ineffective if the operating site cannot be isolated from oral fluids.
- Unsuitable for areas with heavy occlusion, bruxism, or if it provides all occlusal contacts.
- Requires operator's technical proficiency and understanding of material limitations.
GV BLACK Classification
- Class I encompasses all pit and fissure sites.
Tooth Preparation Principles
- Access creation to faulty structures is essential.
- Removal of caries, defective restorations, and base materials is necessary.
- Convenience form enables easier restoration, with bonding providing retention.
Bur Types
- Diamond and carbide burs create a thick smear layer during preparation.
Small to Moderate Class I Preparations
- Minimally invasive approach recommended.
- Avoidance of typical resistance and retention features.
- Cavosurface forms should flare without uniform or flat walls.
- Initial pulpal depth of approximately 0.2 mm inside the DEJ.
Moderate to Large Class I Preparations
- Avoid excessive extension beyond faulty structure removal.
- Sealants can be merged with composite restoration.
- Preserve cuspal and marginal ridge integrity; ridges need 1.5 mm thickness for premolars, 1.75-2 mm for molars.
Occlusal Surface Beveling
- No need for beveling on the occlusal margin due to enamel rod exposure from preparation, preventing thin composite areas under heavy contact.
Composition of Composite Material
- Composed of a continuous polymeric or resin matrix with inorganic fillers.
- Radiopaque fillers, like barium glass, employed for visibility in radiographs.
Role of Inorganic Filler
- Enhances restorative material strength and decreases thermal expansion rates.
Bond Formation Between Matrix and Filler
- Achieved by coating filler particles with a silane coupling agent, improving composite strength and reducing solubility.
Classification of Composites
- Primarily classified based on size, amount, and composition of inorganic fillers, plus handling characteristics.
Linear Coefficient of Thermal Expansion (LCTE)
- Modern composites exhibit an LCTE three times greater than tooth structure.
C Factor of Composites
- C factor indicates the ratio of bonded to unbonded surfaces and affects stress during polymerization shrinkage.
Definition of LCTE
- Linear coefficient of thermal expansion measures a material’s dimensional change rate per temperature unit change; closer LCTE values to enamel reduce void formation risks.
Composite Curing Methods
- Self-cured composites utilize catalyst/base systems.
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Description
This quiz focuses on the advantages and disadvantages of using composite materials in Class I and II direct restorations. Learn about the properties that make composites a popular choice for dental restorations, as well as their limitations. Perfect for dental students and professionals alike.
