Which of the following cytokeratin is not found in orthokeratinized epithelium?

 # Which of the following cytokeratin is not found in orthokeratinized epithelium?

A. K9

B. K10

C. K11

D. K19

The correct answer is D. K19

Keratins K1, K2, and K10 through K12, which are specific to epidermal-type differentiation, are immunohistochemically expressed with high intensity in orthokeratinized areas and with less intensity in parakeratinized areas. K6 and K16, which are characteristic of highly proliferative epithelia, and K5 and K14, which are stratification-specific cytokeratins, also are present. Parakeratinized areas express K19, which is usually absent from orthokeratinized normal epithelia.

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PDL fibers that prevent extrusion are:

 # PDL fibers that prevent extrusion are: 

A. Horizontal

B. Oblique

C. Transseptal

D. Alveolar crest fibers

The correct answer is D. Alveolar crest fibers.

Alveolar crest fibers extend obliquely from the cementum just beneath the junctional epithelium to the alveolar crest. Fibers also run from the cementum over the alveolar crest and to the fibrous layer of the periosteum that covers the alveolar bone. The alveolar crest fibers prevent the extrusion of the tooth and resist lateral tooth movements. The incision of these fibers during periodontal surgery does not increase tooth mobility unless significant attachment loss has occurred.

Reference: Carranza's

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Elastic fiber component of periodontal ligament with age:

 # Elastic fiber component of periodontal ligament with age:

A. Remains same

B. Increases

C. Decreases

D. Either increases or decreases with age

The correct answer is B. Increases. 

Changes in the periodontal ligament that have been reported with aging include decreased numbers of fibroblasts and a more irregular structure, thus paralleling the changes seen in the gingival connective tissues. Other findings include decreased organic matrix production, epithelial cell rests, and increased amounts of elastic fiber.

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All of the following conditions affect oral and perioral tissues and are self-limiting EXCEPT:

 # All of the following conditions affect oral and perioral tissues and are self-limiting EXCEPT:

A. Varicella

B. Herpangina

C. Erythema multiforme

D. Hand, foot and mouth disease

E. Lupus erythematosus

The correct answer is E. Lupus erythematosus.

Lupus erythematosus (LE) may be seen in one of two well recognized forms: systemic (acute) lupus erythematosus (SLE) and discoid (chronic) lupus erythematosus (DLE), both of which may have oral manifestations. A third form, known as subacute lupus, has also been described. In the spectrum of LE, SLE is of particular importance because of the profound impact it has on many organs. DLE is the less aggressive form, predominantly affecting the skin and rarely progressing to the systemic form. It may, however, be of great cosmetic significance because of its predilection for the face. Subacute cutaneous LE, described as lying intermediate between SLE and DLE, results in skin lesions of mild to moderate severity. It is marked by mild systemic involvement and the appearance of some abnormal autoantibodies.

DLE is usually treated with topical corticosteroids. Highpotency corticosteroid ointments can be used intraorally. In refractory cases, antimalarials or sulfones may be used. Systemic steroids may be used in the treatment of SLE. The prednisone dose is generally dependent on the severity of the disease, and prednisone may be combined with immunosuppressive agents for their therapeutic and steroid-sparing effects. Antimalarials and nonsteroidal antiinflammatory drugs may help control this disease.

Reference: Oral Pathology Clinical Pathologic Correlations, Regezi, Sciubba, Jordan (2016)

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Microscopic feature responsible for the clinical appearance of Wickham striae

 # Which of the following microscopic features is responsible for the clinical appearance of Wickham striae?

A. Fibrin deposition

B. Reduced vascularity

C. Acantholysis

D. Hyperkeratosis

E. Intracellular keratinocyte edema

The correct answer is D. Hyperkeratosis.

Several types of lichen planus within the oral cavity have been described. The most common type is the reticular form, which is characterized by numerous interlacing white keratotic lines or striae (so-called Wickham’s striae) that produce an annular or lacy pattern. The buccal mucosa is the site most commonly involved. 

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Legally dental records are the property of:

 # Legally dental records are the property of:

A. The patient

B. The dentist

C. The state

D. None of the above

The correct answer is B. The Dentist.

Dental radiographs should be kept indefinitely. The dental record must include documentation of informed consent and the exposure of radiographs (e.g., the number and type of films, the rationale for exposure and the interpretation). Legally, dental radiographs are the property of the dentist. Patients do,

however, have a right to reasonable access to the dental radiographs, which includes having a copy of the radiographs forwarded to another dentist.

Patients may refuse dental x-rays, however the dentist must decide whether an accurate diagnosis can be provided and whether treatment can provided.

*** No document can be signed by the patient that releases the dentist from liability.

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The biggest advantage of pulp revascularization in endodontics is:

 # The biggest advantage of pulp revascularization in endodontics is:

A. Achieving continued root development

B. No additional material such as TCP or MTA is required

C. No obturation is needed

D. After control of infection, it can be completed in a single visit

The correct answer is A. Achieving continued root development.

Revascularization is a new treatment method for immature (open apex) necrotic permanent teeth. This technique allows the growth of root even when the pulp is necrotic. This helps in strengthening and avoiding damage to the remaining thin and fragile walls of the immature apex. The main aim of this technique is stimulating the residual apical pulp stem cells which are able to survive due to the abundant blood supply in the open apex cases.

Revascularization procedure aids in:

- Stimulation of odontoblasts or undifferentiated mesenchymal cells at the periapex

- Deposition of the calcific material at the apex as well as lateral dentinal walls

- Normal maturation of the entire root

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