Dental Composites Types

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Questions and Answers

What is the main advantage of allowing layer polymerization in composites?

  • Reduced difficulty in achieving color
  • Less shrinkage (correct)
  • Greater fluidity
  • Increased mechanical resistance

Which type of composite resin is used for cementation and as a filling material?

  • Self-cured
  • Chemical-cured
  • Light-cured
  • Dual polymerization (correct)

What is the main drawback of self-cured composites?

  • Long working time
  • Difficulty in achieving color
  • Short working time (correct)
  • High shrinkage

What is the main characteristic of flowable composites?

<p>Greater fluidity (B)</p> Signup and view all the answers

Which type of composite resin is indicated for posterior teeth?

<p>High viscosity (D)</p> Signup and view all the answers

What is the main disadvantage of macro filled composite resins?

<p>Difficulty in polishing (D)</p> Signup and view all the answers

What is the main advantage of light-cured composites?

<p>Long working time (C)</p> Signup and view all the answers

What is the main use of flowable composites in restorative treatments?

<p>For sealing pits and fissures (B)</p> Signup and view all the answers

What is the direction of shrinkage in photopolymerizable composites?

<p>Towards the light and then towards the depth (C)</p> Signup and view all the answers

What is the effect of increasing the percentage of inorganic particles on the aqueous absorption of composites?

<p>It decreases the aqueous absorption (C)</p> Signup and view all the answers

What is the result of the hygroscopic expansion of composites?

<p>It compensates for the shrinkage of the material (B)</p> Signup and view all the answers

What is the main cause of material fatigue in dental composites?

<p>Repeated small forces (A)</p> Signup and view all the answers

What is the purpose of adding radiopaque substances to dental composites?

<p>To set the internal and external limits of the restorations (B)</p> Signup and view all the answers

What is the effect of shrinkage on the marginal and occlusal margins of dental restorations?

<p>It increases the risk of fractures (A)</p> Signup and view all the answers

What is the percentage of mass volume affected by polymerization shrinkage in composite resins?

<p>2.7-7.1% (C)</p> Signup and view all the answers

What is the consequence of polymerization shrinkage in terms of dentinal hypersensitivity?

<p>Increased dentinal hypersensitivity due to fluid movements within the dentinal tubules (A)</p> Signup and view all the answers

What happens to the internal stress caused by polymerization shrinkage over time?

<p>It can be reabsorbed if the remaining walls are strong enough (A)</p> Signup and view all the answers

What is the most serious problem associated with composite resins?

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

What is the effect of polymerization shrinkage on the cuspidal deflection?

<p>It reduces the intercuspal distance by up to 2% (D)</p> Signup and view all the answers

What is the consequence of polymerization shrinkage on the enamel?

<p>It causes cracks or fractures mainly at cervical enamel and gingival floors (A)</p> Signup and view all the answers

What is the relationship between polymerization shrinkage and microfiltration?

<p>Microfiltration is especially prominent when there is poor or absent enamel (C)</p> Signup and view all the answers

What is the effect of polymerization shrinkage on gap formation?

<p>It causes gap formation by detachment of the dentin seal (B)</p> Signup and view all the answers

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