DDS Doctor of Dental Surgery MCQ 4

Question 1

Which microorganism is considered the primary etiological agent in the initiation of dental caries?

Accepted Answer

Streptococcus mutans

Answer

Streptococcus mutans is the principal organism initiating dental caries due to its high acidogenic and aciduric properties and ability to produce glucan for biofilm adherence.

Question 2

Which radiographic view is best for evaluating the condylar head and the temporomandibular joint space?

Accepted Answer

Transcranial radiograph

Answer

The transcranial (lateral oblique) projection provides a useful view of the lateral aspect of the condylar head and the joint space.

Question 3

During tooth preparation for a full cast crown, the occlusal reduction for a posterior tooth should generally be:

Accepted Answer

1.5–2.0 mm

Answer

Adequate occlusal reduction of 1.5–2.0 mm is required for posterior full cast crowns to provide sufficient metal thickness and strength.

Question 4

A patient with poorly controlled type 2 diabetes is more susceptible to periodontitis primarily because of:

Accepted Answer

Impaired neutrophil function and advanced glycation end-products

Answer

Hyperglycemia impairs neutrophil chemotaxis and phagocytosis and promotes formation of AGEs, which upregulate inflammatory cytokines and damage periodontal tissues.

Question 5

Which suture material is preferred for intraoral wounds because it dissolves without removal?

Accepted Answer

Polyglycolic acid (Dexon)

Answer

Resorbable sutures like polyglycolic acid (Dexon) or polyglactin (Vicryl) are preferred intraorally because patients do not need to return for removal.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Doctor of Dental Surgery MCQ 4