# Most common reason for the removal of impacted mandibular third molars is:
A. Referred pain
B. Recurrent pericoronitis
C. Chronic periodontal disease
D. Orthodontic treatment
The correct answer is B. Recurrent Pericoronitis
Pericoronitis is an inflammatory lesion occurring around the impacted or partially erupted tooth. An incomplete eruption of the tooth provides a large stagnation area for food debris under the gingival flap. This becomes infected easily and results in inflammation of the pericoronal flap. It exhibits chronic inflammation for a long period. If the debris and bacteria are deeply entrapped, an abscess may form which is called a pericoronal abscess. It is a mixed infection and various bacteria of the dental plaque (particularly anaerobes) play a significant role in the development of pericoronitis.
Clinical Features: The mandibular third molar is the commonly involved tooth. Pain and swelling of the pericoronal tissue around the affected tooth, difficulty in chewing, and difficulty in opening the mouth are the usual complaints. The patient may be mildly ill with fever, malaise, and regional lymphadenopathy.
Management: Entrapped food debris must be removed. When the upper tooth is involved, it should be grounded or extracted if it is malposed. Radiograph helps in assessing the position of the involved tooth. If impacted, the tooth must be removed. And if it is in a favorable position, surgical removal of the pericoronal flap is advocated after acute symptoms subside. The administration of antibiotics helps to relieve the symptoms and prevents the spread of infection to the adjacent tissue spaces.
Ref: Shafer's Textbook of Oral Pathology, 7E, Page: 400
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AIIMS MDS Nov 2007 MCQs - Part 2
A. Blue black line
B. Yellow line
C. Grayish black line
D. Steel gray line
# Dilaceration occurs due to:
A. Trauma to the tooth germ during root development
B. Abnormal displacement of the tooth germ during root development
C. Abnormal displacement of enamel epithelium during tooth development
D. Abnormal displacement of ameloblasts during tooth development
AIIMS MDS Nov 2007 MCQs - Part 1
A. Pterion
B. Lambda
C. Vertex
D. Inion
# A non synovial joint with dense connective tissue between two bony surfaces is termed as:
A. Synchondrosis
B. Syndesmosis
C. Symphysis
D. Suture
Radiographically, driven snow appearance is seen with:
# Radiographically, driven snow appearance is seen with:
A. Adenomatoid odontogenic tumor
B. Calcifying odontogenic cyst
C. Calcifying epithelial odontogenic tumor
D. Keratocyst
A. Adenomatoid odontogenic tumor
B. Calcifying odontogenic cyst
C. Calcifying epithelial odontogenic tumor
D. Keratocyst
The correct answer is C. Calcifying Epithelial Odontogenic Tumor
- Scattered flecks of calcification throughout the radiolucency has given rise to the descriptive term driven snow appearance.
- Lesion appears as diffuse or well circumscribed unilocular radiolucency.
- Combined radiolucency and radioopacity with irregular bony spicules producing honeycomb pattern
- Scattered flecks of calcification give driven snow appearance
- Sometimes, lesion is totally radiolucent and in association with unerupted tooth
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