Root Canal Treatment and Nonvital Bleaching
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Questions and Answers

What is the primary reason for sealing the root-canal filling material with a base material?

  • To prevent the bleaching agent from affecting the tooth structure
  • To enhance the esthetic appearance of the tooth
  • To improve the marginal seal of the restoration
  • To prevent the bleaching agent from penetrating into the periodontal space or root canal (correct)

What is the primary cause of tooth discoloration?

  • Hydrogen sulfate formation
  • Hemolysis of erythrocytes in the dentin tubules (correct)
  • Radiologically detectable periapical radiolucency
  • Oxidative reactions of bleaching agents

Which of the following is NOT a common cause of tooth discoloration in non-vital teeth?

  • Root canal therapy
  • Tooth decay (correct)
  • Pulp tissue damage
  • Blood byproducts

What is a crucial requirement for internal tooth bleaching?

<p>A sealed root-canal filling (D)</p> Signup and view all the answers

What is the primary reason why non-vital teeth may undergo internal staining after root canal treatment?

<p>The pulp chamber and root canal system are sealed off from the bloodstream (C)</p> Signup and view all the answers

What is the primary indication for non-vital bleaching?

<p>Discolored non-vital teeth (B)</p> Signup and view all the answers

Which of the following is a key factor in the effectiveness of non-vital bleaching?

<p>Precise removal of all restorative materials from the access cavity (D)</p> Signup and view all the answers

Which of the following bleaching agents is NOT commonly used in internal tooth bleaching?

<p>Sodium hypochlorite (D)</p> Signup and view all the answers

What should be replaced prior to bleaching, according to the text?

<p>Insufficient coronal restorations (C)</p> Signup and view all the answers

What is the name of the internal tooth bleaching technique first described by Spasser in 1961?

<p>Walking-bleach technique (C)</p> Signup and view all the answers

What is the purpose of internal bleaching in non-vital teeth?

<p>To improve the esthetic appearance of the tooth (C)</p> Signup and view all the answers

What is a contraindication for internal bleaching?

<p>The presence of a fiber post in the root canal (B)</p> Signup and view all the answers

What is the purpose of a waiting period in cases of radiologically detectable periapical radiolucency?

<p>To monitor the progression of the lesion (B)</p> Signup and view all the answers

What is a consequence of pulp necrosis in teeth?

<p>Tooth discoloration (B)</p> Signup and view all the answers

What is the primary reason why non-vital bleaching is most effective on teeth with stable restorations?

<p>The restorations do not respond to bleaching agents (C)</p> Signup and view all the answers

Why is patient compliance crucial in non-vital bleaching?

<p>To maintain good oral hygiene practices during and after treatment (C)</p> Signup and view all the answers

Why is it necessary to cover the cement used to close perforations with a base?

<p>To prevent the bleaching agent from penetrating into the periodontal space (C)</p> Signup and view all the answers

What is the result of the oxidative reactions of bleaching agents?

<p>Reversion of the chromatic change (A)</p> Signup and view all the answers

What is a characteristic of internal tooth bleaching?

<p>Minimally invasive and conservative (C)</p> Signup and view all the answers

What is the primary goal of internal tooth bleaching?

<p>To improve the aesthetics of the smile (A)</p> Signup and view all the answers

What is the significance of dentin in internal tooth bleaching?

<p>Dentin must be cleaned to facilitate diffusion of the bleaching agent (C)</p> Signup and view all the answers

What is the primary focus of aesthetics in dentistry?

<p>Psychosocial impact on an individual's self-perception (A)</p> Signup and view all the answers

What is the main difference between vital and non-vital bleaching?

<p>Location of application (B)</p> Signup and view all the answers

What is a common indication for non-vital tooth bleaching?

<p>Discoloration after root canal treatment (B)</p> Signup and view all the answers

Which of the following is a contraindication for non-vital tooth bleaching?

<p>Periodontal disease (A)</p> Signup and view all the answers

What is the primary cause of non-vital tooth discoloration?

<p>Blood decomposition in the pulp chamber (B)</p> Signup and view all the answers

What is the purpose of using GI or RMGI in non-vital tooth bleaching?

<p>To prevent leakage of the bleaching material (C)</p> Signup and view all the answers

What is the primary goal of walking bleach technique?

<p>To facilitate the bleaching process (D)</p> Signup and view all the answers

Which of the following is a complication of non-vital tooth bleaching?

<p>Leakage of the bleaching material (B)</p> Signup and view all the answers

What is the term for the lightening of the color of a tooth through the application of a chemical agent?

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

Why do teeth that have undergone root canal therapy often darken?

<p>Because the pulp chamber and root canal system are sealed off from the bloodstream (A)</p> Signup and view all the answers

What is essential for nonvital bleaching to be effective on teeth with stable restorations?

<p>The restorations must match the shade of the surrounding natural teeth (C)</p> Signup and view all the answers

Why is patient desire for aesthetics important in nonvital bleaching?

<p>Because it is a suitable treatment option when patients desire an improvement in the aesthetics of their smile (D)</p> Signup and view all the answers

What is crucial for patient compliance in nonvital bleaching?

<p>Good oral hygiene practices during and after the treatment (A)</p> Signup and view all the answers

What is the most important factor in the effectiveness of internal bleaching?

<p>Precise removal of all restorative materials from the access cavity without additional dentin elimination (A)</p> Signup and view all the answers

Why is it essential to clean the dentin in internal bleaching?

<p>To facilitate diffusion of the bleaching agent through the dentinal tubules (D)</p> Signup and view all the answers

What happens when a fiber post is cemented in the root canal and the pulp chamber is filled with composite resin?

<p>Removing the restorative material and post can compromise the amount of sound dentin (B)</p> Signup and view all the answers

What is a contraindication for internal bleaching?

<p>Presence of restorative materials in the access cavity (A)</p> Signup and view all the answers

Why is it necessary to remove all restorative materials from the access cavity?

<p>To facilitate diffusion of the bleaching agent (D)</p> Signup and view all the answers

What is the primary reason for patient desire for aesthetics in nonvital bleaching?

<p>To improve the aesthetics of their smile (B)</p> Signup and view all the answers

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