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

Metapex is a combination of:

 # Metapex is a combination of: 

A. Calcium hydroxide + ZOE

B. ZOE + Iodoform

C. Calcium hydroxide + Iodoform

D. Calcium hydroxide + GIC

The correct answer is C. Calcium hydroxide + Iodoform.

Metapex = Calcium hydroxide + iodoform 

Vitapex = Calcium hydroxide + iodoform + Silicon based oil (better flow able property) 

• Ideal material for obturating primary teeth = same resorption rate as of primary tooth roots 

• Both Vitapex & metapex has same resorption rate to primary tooth root but due to better flow able property of vitapex its nearly IDEAL and best material for obturation in primary teeth. 

The condylar cartilage in the mandible is held to be a:

# The condylar cartilage in the mandible is held to be a: 

A. Primary cartilage

B. Secondary cartilage

C. Tertiary cartilage

D. Non growing cartilage

The correct answer is B. Secondary cartilage.

Meckel's cartilage is the primary cartilage of mandible. The cartilages at the condyle, coronoid and symphysis are the secondary cartilages. The condylar cartilage is considered as the pacemaker for growth of that bone. Nasal septum is considered as the pacemaker for growth of maxilla. 

In Peck and Peck index, mesiodistal and buccolingual measurements of which of the following tooth is taken:

 # In Peck and Peck index, mesiodistal and buccolingual measurements of which of the following tooth is taken: 

A. Maxillary central incisor 

B. Mandibular central incisor

C. Maxillary premolars 

D. Mandibular molars 

The correct answer is B. Mandibular central incisor.

Peck and Peck index: 

The mandibular incisors in persons with no crowding will have smaller mesiodistal width and large labiolingual width than in persons with incisal crowding.

The proportion of the mesiodistal width of each tooth to the labio lingual thickness is calculated using the formula:

M.D.W./L.L.W x100 

Mean value for lower central incisor should be 88 to 92%. 

Mean value for lower lateral incisor should be 90 to 95% 

If the calculated value is greater than mean value, it indicates that the mesiodistal width is more than labiolingual width and hence proximal stripping is indicated.