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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Face bow is used to record:

 # Face bow is used to record:

A. Orientation relation

B. Centric relation

C. Eccentric relation

D. Vertical jaw relation

The correct answer is A. Orientation relation.

The maxillary cast is attached to the articulator using the orientation jaw relation records. The procedure of transferring the orientation relation to the articulator is called face-bow transfer.

Orientation jaw relation is defined as: “the jaw relation when the mandible is kept in its most posterior position, it can rotate in the sagittal plane around an imaginary transverse axis passing through or near the condyles”—GPT.

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Fixed factor according to Hanau is:

 # Fixed factor according to Hanau is:

A. Orientation of occlusal plane

B. Condylar guidance

C. Incisal guidance

D. Compensating curve

The correct answer is B. Condylar guidance.

Increase in the condylar guidance will increase the jaw separation during protrusion. This factor

of balanced occlusion cannot be modified. All the other four factors of occlusion should be modified to compensate the effects of this factor. In patients with a steep condylar guidance, the incisal guidance should be decreased to reduce the amount of jaw separation produced during protrusion and vice versa. But it should be remembered that the incisal guidance cannot be made very steep because it has its own ill effects.

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A complete or partial removable denture supported by retained roots is known as:

 # A complete or partial removable denture supported by retained roots is known as:

A. Conventional immediate denture

B. Transitional immediate denture

C. Cast partial denture

D. Over dentures

The correct answer is D. Overdenture.

Overdentures are defined as, 'a dental prosthesis that replaces the lost or missing natural dentition and associated structures of the maxilla and/or mandible and receives partial support and stability from one or more modified natural teeth'. 

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