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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An anterior tooth bounded edentulous area which crosses the midline:

 # An anterior tooth bounded edentulous area which crosses the midline:

A. Class I

B. Class III

C. Class IV

D. Class IX

The correct answer is C. Class IV.

Class IV Kennedy classification is a single but bilateral (crossing the midline) edentulous area located anterior to the remaining natural teeth.

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