The upper denture falls when the patient opens his mouth wide. This is due to:

  # The upper denture falls when the patient opens his mouth wide. This is due to:

A. Thick labial flange

B. Over extended borders

C. Thick distobuccal flange

D. Poor peripheral seal

The correct answer is C. Thick distobuccal flange

The thickness of distobuccal flange of maxillary denture must be adjusted to accommodate the ramus, coronoid process and the masseter. If the flange is too thick, the coronoid process will push the denture out of place during opening or lateral movements of mandible.

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Posterior palatal seal is recorded when the head is bent at:

  # Posterior palatal seal is recorded when the head is bent at:

A. 15 degree

B. 30 degree

C. 45 degree

D. 60 degree

The correct answer is B. 30 degree.

In conventional method of recording posterior palatal seal, the patient is seated in an upright position. In fluid wax technique, posterior palatal seal is recorded when the head is bent at 30 degree.

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The type of patient demanding to be educated before the complete denture fabrication:

 # The type of patient demanding to be educated before the complete denture fabrication:

A. Philosophical

B. Exacting

C. Indifferent

D. Hysterical

The correct answer is B. Exacting.

Exacting patients are precise in everything they do. They are immaculate in dress and appearance. Their

nature is to be satisfied only by perfection. They may demand that the dentist explain every step of the

treatment in detail. These patients should not be promised that they will be able to wear a prosthesis

without any inconvenience, because they will expect the dentist to live up to such promises. Potential

problems and inconveniences should be explained in detail before treatment is initiated.

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The primary function of posterior palatal seal is to:

 # The primary function of posterior palatal seal is to:

A. Retention of upper denture by making a complete seal

B. Aid in insertion and removal of the upper denture

C. Achieve balanced occlusion

D. Retention of lower denture

The correct answer is A. Retention of upper denture by making a complete seal.

The primary purpose of PPS is the retention of the maxillary denture. PPS creates a partial vacuum beneath the maxillary denture. This partial vacuum is activated only when horizontal or tipping forces are directed against the denture base. The duration of this vacuum is small and so little or no irreversible alterations to the underlying mucosa will take place.

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