# Most frequent site for dry socket is:

 # Most frequent site for dry socket is:

A. Upper molar area

B. Upper incisor area

C. Lower molar area

D. Lower incisor area

The correct answer is C. Lower molar area.

'Dry socket' derives its name from the fact that after the clot is lost the socket has a dry appearance because of the exposed bone. This condition is more common in women and tobacco users, and is most frequently associated with difficult or traumatic extractions and thus most commonly follows removal of an impacted mandibular third molar. In a series of 138 ‘dry sockets’ among 6,403 teeth extracted in human patients, Krogh reported that 95% were in lower bicuspid and molar sockets, and this is confirmed by most other large series of cases.

Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No:  601

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Which one of the following is not a valid indication for apicoectomy?

 # Which one of the following is not a valid indication for apicoectomy?

A. Broken instrument in the apical third of the canal

B. Presence of a fistula

C. Perforation in apical third

D. Periapically involved teeth in patients with insufficient time for conventional endodontic treatment

The correct answer is D. Periapically involved teeth in patients with insufficient time for conventional endodontic treatment

Valid Indications for which apicoectomy can be considered are:

- Failure of nonsurgical endodontic treatment

- Failure of previous surgery

- Anatomical problems: non-negotiable or blocked canal, or severe root curvature

- Iatrogenic errors: ledging of canals, blockage from debris, separated instruments, overfilling of canals leading to foreign body reaction, and apical canal transportation

- Horizontal apical root fracture

- Exploratory surgery and biopsy: in teeth where a fracture is suspected or in teeth with vital pulp with a radicular radiolucency

- Periodontal considerations: Hemisection and radisection are planned in cases where the periodontal support of one of the roots goes beyond repair.

Reference: GROSSMAN’S ENDODONTIC PRACTICE 14TH EDITION, Page NO: 426

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AIIMS November 2013 MDS Entrance exam MCQs

# Cavernous sinus thrombosis is due to infection of:
A. Pterygoid plexus
B. Submental space
C. Maxillary sinus
D. Submandibular space

# Tributaries of cavernous sinus include all except:
A. Superior petrosal sinus
B. Inferior petrosal sinus
C. Superior middle cerebral vein
D. Deep middle cerebral vein

AIIMS NOV 2012 MDS Past Entrance Exam MCQs - Dental MCQs

# Paralysis of cranial root of accessory nerve affects all except:
A. Cricopharyngeus
B. Salpingopharyngeus
C. Palatopharyngeus
D. Stylopharyngeus

# Direct and consensual light reflex is lost in which nerve palsy:
A. Trigeminal
B. Oculomotor
C. Optic
D. Trochlear