DDS Doctor of Dental Surgery MCQ 3

Question 1

Which tooth surface is most susceptible to root caries in the elderly population?

Accepted Answer

Buccal surface below the CEJ

Answer

Exposed root surfaces, especially buccal surfaces below the CEJ, are most susceptible to root caries due to gingival recession common in elderly patients.

Question 2

Which tooth movement produces the greatest amount of root resorption during orthodontic treatment?

Accepted Answer

Intrusion

Answer

Intrusive tooth movement produces the greatest root resorption because it concentrates force at the root apex.

Question 3

A removable partial denture major connector for a mandibular arch should be located:

Accepted Answer

At least 3–4 mm from the gingival margins

Answer

Mandibular major connectors must be placed at least 3–4 mm from the gingival margins to avoid impingement on gingival tissues.

Question 4

Which periodontal fiber group is responsible for resisting intrusive forces on the tooth?

Accepted Answer

Oblique fibers

Answer

Oblique fibers, the most numerous PDL fibers, run from cementum in a coronal direction to alveolar bone and primarily resist intrusive (axial) forces.

Question 5

Zinc oxide eugenol temporary cement should NOT be used under which type of restoration?

Accepted Answer

Composite resin restorations

Answer

Eugenol inhibits the polymerization of composite resin, so ZOE cements are contraindicated as bases or temporaries under composite restorations.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Doctor of Dental Surgery MCQ 3