Posterior Palatal Seal in Dentures
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Questions and Answers

What is the purpose of a good posterior seal in a denture?

  • Improving speech clarity
  • Preventing accumulation of food between denture and palate (correct)
  • Reducing the gag reflex
  • Enhancing taste sensation

Which forces can a properly placed posterior palatal seal help resist?

  • Horizontal forces (correct)
  • Diagonal forces
  • Translational forces
  • Rotational forces

Where does the posterior palatal seal lie in relation to the vibrating lines?

  • Below the vibrating lines (correct)
  • Above the vibrating lines
  • On top of the vibrating lines
  • Adjacent to the vibrating lines

What is located at the junction of attached tissue overlying the hard palate and the movable tissue of the soft palate?

<p>Anterior vibrating line (D)</p> Signup and view all the answers

Which of the following is NOT a function of a properly placed posterior palatal seal?

<p>Impinging tissues of hard palate (B)</p> Signup and view all the answers

What makes up for shrinkage of acrylic that occurs during processing of a denture?

<p>Properly placed posterior palatal seal (B)</p> Signup and view all the answers

Where does a good border seal help resist forces acting upon a denture?

<p>Horizontal and translational forces (C)</p> Signup and view all the answers

What lies between the movable and immovable tissues of the soft palate?

<p>Posterior palatal seal (B)</p> Signup and view all the answers

Which structure takes the shape of a cupid’s bow due to the projection of the posterior nasal spine?

<p>Anterior vibrating line (C)</p> Signup and view all the answers

What is the recommended depth of the line scribed for the posterior palatal seal?

<p>1/2 depth of #8 round bur (C)</p> Signup and view all the answers

How should the edges of the scribed line for the posterior palatal seal be treated?

<p>Blended and rounded off (A)</p> Signup and view all the answers

Where should the arbitrary posterior palatal seal be scribed from?

<p>Midline to hamular notch area (C)</p> Signup and view all the answers

What should be used to adjust the baseplate to coincide with the posterior edge of the posterior palatal seal?

<p>Acrylic bur (A)</p> Signup and view all the answers

How should the baseplate be modified if it is already fabricated and needs adjustment at the posterior border?

<p>Adjust with an acrylic bur (D)</p> Signup and view all the answers

Where should the mid portion of the posterior palatal seal be in relation to the posterior border?

<p>Slightly forward from the edge (D)</p> Signup and view all the answers

What tool can be used to blend and round off the edges of the scribed line?

<p>#7 wax spatula (C)</p> Signup and view all the answers

How far anterior to the posterior limit should the anterior portion of the posterior palatal seal be?

<p>~3-4 mm (A)</p> Signup and view all the answers

What is used to scribe the line for the Posterior Palatal Seal?

<p>#8 Round Bur on straight handpiece (C)</p> Signup and view all the answers

What should not happen with the baseplate at the posterior border during adjustment?

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

Where is the posterior vibrating line located?

<p>At the demarcation between the tensor veli palatini muscle and soft palate (C)</p> Signup and view all the answers

How is the posterior vibrating line visualized?

<p>By asking the patient to say 'ah' normally, unexaggerated way in short bursts (C)</p> Signup and view all the answers

What does the posterior vibrating line demarcate?

<p>The area with limited movement during function from the area markedly displaced during function (D)</p> Signup and view all the answers

When is the Arbitrary Posterior Palatal Seal placed?

<p>After trimming and drying the master cast (D)</p> Signup and view all the answers

What anatomical structures determine the posterior length/edge of a denture?

<p>Hamular notch and vibrating line (D)</p> Signup and view all the answers

How can you locate the Arbitrary Posterior Palatal Seal?

<p>By drawing a line extending from fovea palatini to the hamular notch (B)</p> Signup and view all the answers

What is the purpose of placing the Arbitrary Posterior Palatal Seal?

<p>To create a post dam area (D)</p> Signup and view all the answers

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