Initial control of hemorrhage after tooth extraction is achieved by:

 # Initial control of hemorrhage after tooth extraction is achieved by:

A. Placing figure of eight suture around the socket

B. Placing a moisture gauze over the extraction socket

C. Application of hydrogen peroxide pack

D. Prescribe antihemorrhagic drugs

The correct answer is B. Placing a moistened gauze over the extraction socket.

Initial control of hemorrhage is achieved by use of a moistened 2 × 2 inch gauze placed over the extraction socket. The gauze should be positioned such that when the patient closes his or her teeth together, it fits into the space previously occupied by the crown of the tooth. Biting of teeth together places pressure on the gauze, and the pressure is then transmitted to the socket. This pressure results in hemostasis. If the gauze is simply placed on the occlusal table, the pressure applied to the bleeding socket is insufficient to achieve adequate hemostasis. A larger gauze sponge (4 × 4 inches) may be required if multiple teeth have been extracted or if the opposing arch is edentulous.

Reference: CONTEMPORARY ORAL AND MAXILLOFACIAL SURGERY, Sixth Edition, Page NO 118

Dumble-bell shaped swelling is characteristic of which type of odontogenic space infection:

# ‘Dumble-bell’ shaped swelling is characteristic of which type of odontogenic space infection?

A. Submandibular space infection

B. Buccal space infection

C. Submasseteric space infection

D. Temporal space infection

The correct answer is D.Temporal Space Infection.

"Dumb-bell" shaped swelling is seen in deep temporal space infection because of zygomatic arch, swelling is seen superior and inferior to zygomatic arch resulting in Dumb-bell shaped swelling.

Presence of portwine stains, gingival overgrowth and convulsive disorders

 # Which of the following is characterized by the presence of portwine stains, gingival overgrowth and convulsive disorders?

A. Sturge Weber syndrome

B. Witkop syndrome

C. Hunter syndrome

D. Fanconi syndrome

The correct answer is A. Sturge Weber Syndrome.

Encephalotrigeminal Hemangiomatosis

(Sturge-Weber syndrome)

The facial cutaneous capillary venous angiomas (or port-wine nevi) are usually the first component

of the syndrome to be observed, at birth, and are confined almost exclusively to the skin area supplied by the trigeminal nerve. Neurologic manifestations are among the most characteristic features of the disease and consist of convulsive disorders and spastic hemiplegia with or without mental retardation. Occasionally, angiomatous lesions also involve the gingiva and buccal mucosa.

Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No: 149

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Undifferentiated mesenchymal cells around blood vessels are known as:

# Undifferentiated mesenchymal cells around blood vessels are known as:

A. Histiocytes

B. Pericytes

C. Fibroblast

D. Osteoblast

The correct answer is B. Pericytes.

Experimental studies have shown that a population of progenitor cells with the potential to differentiate into several distinct mesenchymal cell types can be isolated from the periodontal ligament. In cell culture, periodontal ligament stem cells can differentiate into cells that form bone, cementum, cartilage, fat, muscle, and neuron- and glial-like cells. Recent work indicates that perivascular cells (pericytes) associated with the microvasculature of alveolar bone and periodontal ligament of mice can differentiate into osteoblasts, cementoblasts, cementocytes, and periodontal ligament fibroblasts in

untreated animals, as well as after injury of the periodontium.

Reference: Fundamentals of Oral Histology and Physiology, Arthur R. Hand, 2014, Page no 128

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The protein content of a keratocyst is found to be:

# The protein content of a keratocyst is found to be:

A. less than 4 gm/dL

B. 6 mg/dL

C. Equal to serum protein

D. More than serum protein

The correct answer is A. less than 4 gm/dL.

Aspirational biopsy of odontogenic keratocysts contains a greasy fluid which is pale in colour and contains keratotic squames. Protein content of cyst fluid below 4g% is diagnostic of odontogenic keratocysts. Smaller and unilocular lesions resembling other types of cysts may require a biopsy to confirm the diagnosis. On a CT scan, the radiodensity of a keratocystic odontogenic tumour is about 30 Hounsfield units, which is about the same as ameloblastomas. However, ameloblastomas show more bone expansion and seldom show high density areas.

Reference: Wikipedia

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Familial multilocular cystic disease of the jaws

 # Which of the following is also known as familial multilocular cystic disease of the jaws?

A. Osteopetrosis

B. Cleidocranial dysostosis

C. Hemifacial microsomia

D. Cherubism

The correct answer is D. Cherubism.

Cherubism, a non-neoplastic hereditary bone lesion that is histologically similar to central giant cell granuloma, affects the jaws of children bilaterally and symmetrically, usually producing the so-called cherubic look (Fig. 17-13). The disease was first described in 1933 by Jones, who called it familial multilocular disease of the jaws. The term ‘cherubism’, was introduced by Jones and others to describe the clinical appearance of affected patients. According to the WHO classification, cherubism belongs to a group of non-neoplastic bone lesions affecting only the jaws. It is a rare, benign condition with autosomal dominant inheritance, and it is one of the very few genetically determined osteoclastic lesions in the human body. It appears to have 100% penetrance in males and only 50–70% penetrance in females. There is great variation in the clinical expression.

Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No: 715

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Cause of osteogenesis imperfecta is:

# Cause of osteogenesis imperfecta is:

A. Defect in type I collagen

B. Defect in type II collagen

C. Defect in maturation process

D. Defect in calcification process

The correct answer is A. Defect in type I collagen.

Osteogenesis imperfecta (OI) is a serious disease, the molecular pathogenesis of which is being elucidated and it bears a superficial relatedness to dentinogenesis imperfecta, a milder condition affecting mesodermal tissues. It is a condition resulting from abnormality in the type I collagen, which most commonly manifests as fragility of bones. Although osteogenesis imperfecta is generally recognized as representing a hereditary autosomal dominant characteristic, autosomal recessive and nonhereditary types also occur.

Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No: 699

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