Posterior Palatal Seal in Dentures

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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?

Anterior vibrating line Signup and view all the answers

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

Impinging tissues of hard palate Signup and view all the answers

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

Properly placed posterior palatal seal Signup and view all the answers

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

Horizontal and translational forces Signup and view all the answers

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

Posterior palatal seal 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?

Anterior vibrating line Signup and view all the answers

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

1/2 depth of #8 round bur Signup and view all the answers

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

Blended and rounded off Signup and view all the answers

Where should the arbitrary posterior palatal seal be scribed from?

Midline to hamular notch area 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?

Acrylic bur Signup and view all the answers

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

Adjust with an acrylic bur Signup and view all the answers

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

Slightly forward from the edge Signup and view all the answers

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

#7 wax spatula Signup and view all the answers

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

~3-4 mm Signup and view all the answers

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

#8 Round Bur on straight handpiece Signup and view all the answers

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

Overextended Signup and view all the answers

Where is the posterior vibrating line located?

At the demarcation between the tensor veli palatini muscle and soft palate Signup and view all the answers

How is the posterior vibrating line visualized?

By asking the patient to say 'ah' normally, unexaggerated way in short bursts Signup and view all the answers

What does the posterior vibrating line demarcate?

The area with limited movement during function from the area markedly displaced during function Signup and view all the answers

When is the Arbitrary Posterior Palatal Seal placed?

After trimming and drying the master cast Signup and view all the answers

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

Hamular notch and vibrating line Signup and view all the answers

How can you locate the Arbitrary Posterior Palatal Seal?

By drawing a line extending from fovea palatini to the hamular notch Signup and view all the answers

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

To create a post dam area Signup and view all the answers