Dental MCQs Practice for the Day 2023 Dec 30

# The eosinophil count in the peripheral blood smear is increased in:
A. Allergic conditions
B. Anemia
C. Polycythemia
D. Typhoid fever

# The number of walls in the apical portion of the defect is often greater than that of its occlusal portion, it is referred to as:
A. Osseous craters
B. Combined osseous defect
C. Horizontal defect
D. Vertical defect



# In marasmus, wasting is due to:
A. Prolonged dietary deficiency of calories
B. Prolonged dietary deficiency of Protein
C. Excess catabolism of fat and muscle mass to provide energy
D. All of the above

# Hyperparathyroidism is associated with:
A. Renal stones
B. Bone resorption
C. Increased level of serum calcium
D. All of the above

# Normal body mass index is between:
A. 16.5-20.5
B. 18.5-24.9
C. 25.0-29.9
D. 30.0-39.9

# Speed at which electrons travel in gas tube once released from cathode filament is dependent on:
A. Potential difference between electrodes
B. Angle between filament and andoic target
C. Amount of kilovoltage applied to the circuit
D. Intensity of current applied to the target

# Most common cause of cerebrovascular accident:
A. Arterial thrombosis
B. Venous thrombosis
C. Embolism
D. Tumor

# Which one of the following is the precursor of both gonadal and adrenocortical hormones?
A. Progesterone
B. Cortisol
C. Testosterone
D. Corticosterone

# Gingival manifestation is seen maximum with:
A. AML
B. CLL
C. CML
D. ALL

# A material like amalgam with high compressive strength but low tensile strength is said to be having:
A. Toughness
B. Brittleness
C. Ductility
D. Malleability

# Immediate management of tension pneumothorax is:
A. Tracheostomy
B. CT thorax
C. Central venous line access
D. Decompression with needle or chest tube

# Platelets adhere to the subendothelial collagen through one of the following:
A. Platelet factor 4
B. Fibronectin
C. Von Willebrand's factor
D. None of the above

# Most abundant immunoglobulin is:
A. IgG
B. IgM
C. IgD
D. IgA

# Dilatation of the pupil in head injury is due to:
A. Cerebral irritation
B. Compression of III cranial nerve
C. Pontine hemorrhage
D. All of the above

# Most common cause of thyrotoxicosis is:
A. Grave's disease
B. Multinodular goiter
C. TSH secreting pituitary tumor
D. Toxic adenoma

# Drugs producing ototoxicity and nephrotoxicity are:
A. Tetracyclines
B. Aminoglycosides
C. Quinolones
D. Macrolides

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Chromatolysis is:

 # Chromatolysis is:

A. Disintegration of nucleus

B. Disintegration of golgi apparatus

C. Disappearance of Nissl granules

D. Decrease in cell size

The correct answer is C. Disappearance of Nissl granules.

Chromatolysis is a reactive change that occurs in the cell body of damaged neurons. It involves the dispersal and redistribution of Nissl substance (rough endoplasmic reticulum and polyribosomes) to meet an increased demand for protein synthesis. 

Salivary protein which prevents transmission of HIV via saliva is:

 # Salivary protein which prevents transmission of HIV via saliva is:

A. Sialoperoxidase

B. Secretory IgA

C. Salivary leukocyte protease inhibitor

D. Histidine rich proteins

The correct answer is C. Salivary leukocyte protease inhibitor.

SLPI blocks HIV-1 infection of macrophages and primary T cells at concentrations (1–10 μg/mL) that occur naturally in saliva (Shugars and Wahl, 1998). These findings suggest that SLPI may be partially responsible for the low rate of oral transmission of HIV-1.

Rotational force of extraction is used for delivery of which tooth out of the socket?

 # Rotational force of extraction is used for delivery of which tooth out of the socket?

A. Upper central incisors and lower premolars

B. Upper centrals and lateral incisors

C. Upper and lower central incisors

D. Upper premolars and lower central incisors

The correct answer is A. Upper central incisors and lower premolars.

Rotational pressure, as the name implies, rotates the tooth, which causes some internal expansion of the tooth socket and tearing of periodontal ligaments. Teeth with single, conical roots (such as maxillary incisors and mandibular premolars) and those with roots that are not curved are most amenable to luxation by this technique. Teeth that have other than conical roots or that have multiple roots—especially if those roots are curved—are more likely to fracture under this type of pressure.

Ref: Contemporary Oral and Maxillofacial Surgery 6th Edition, Hupp