All Free Oral Histology MCQs with Answers

• A. Osteoblast
• B. Fibrocytes
• C. Polymorphs
• D. Osteoclasts

Explanation: Osteoclasts are multinucleated cells that attach to bone and dissolve its mineral and organic matrix during resorption.

• A. Reduced enamel epithelium
• B. Dental papilla
• C. Inner enamel epithelium
• D. Dental sac

Explanation: The junctional epithelial attachment develops from the reduced enamel epithelium that remains around the erupting tooth and later attaches…

• A. 101-150 μm
• B. 50-100 μm
• C. 151-200 μm
• D. 201-250 μm

Explanation: The largest arterial vessels in the dental pulp are small arterioles, generally measuring about 50 to 100 micrometres in diameter.

• A. Enamel
• B. Dentin
• C. Pulp
• D. Periodontal ligament

Explanation: Dystrophic calcification commonly occurs in the pulp, especially with ageing, irritation, or inflammation, producing pulp stones or…

• A. Chitin
• B. Keratin
• C. Elastin
• D. Collagen

Explanation: Odontoblasts secrete the organic matrix of dentine, which is mainly type I collagen with associated non-collagenous proteins.

• A. Increased fibrotic component
• B. All of the above
• C. Calcification in blood vessels near apical foramen
• D. Decreased cellular component

Explanation: Pulpal regression includes increased fibrosis, reduced cellularity and progressive calcification, including calcification around vessels…

• A. Fibroblasts
• B. defense cells
• C. Odontoblasts
• D. Histocytes or resting wandering cell

Explanation: Fibroblasts are the most numerous pulp cells, while odontoblasts are generally regarded as the second most prominent cell population.

• A. 0.38 cc
• B. 0.58 cc
• C. 0.02 cc
• D. 3.8 cc

Explanation: The combined pulp volume of all permanent teeth is approximately 0.38 mL or cm³.

• A. Decrease the calcific component of the pulp
• B. Increase cellular component at the expenses of fibre component
• C. Increases vascularity of the pulp
• D. Decreasing the size and shape of pulp tissue and cellular component

Explanation: With age, the pulp space becomes smaller and the tissue shows reduced cellularity, increased fibrosis and more calcifications.

• A. Pulp
• B. TMJ
• C. Skeletal muscle
• D. None of the above

Explanation: Proprioceptors detect position and movement and occur in structures such as skeletal muscle and the temporomandibular joint.

• A. In thymus
• B. Around capillaries of pulp
• C. In gallbladder
• D. Along with heparin on surface of mast cells

Explanation: Pericytes lie outside endothelial cells around small blood vessels, including the capillaries of dental pulp, where they provide support…

• A. Osteoblasts
• B. Ameloblasts
• C. Odontoblasts
• D. Osteocytes

Explanation: Reparative dentin is formed by odontoblasts or odontoblast-like cells that arise after pulpal injury.

• A. Apical foramen
• B. Pulp chamber
• C. Mental foramen
• D. Pulp canal

Explanation: The radicular pulp exits the tooth and becomes continuous with periapical tissues through the apical foramen at the root apex.

• A. Krause end bulbs
• B. Free nerve endings
• C. Pacinian corpuscle
• D. Ruffini corpuscle

Explanation: The pulp is supplied mainly by free nerve endings, so its responses to thermal, mechanical, and chemical stimuli are perceived chiefly as…

• A. Proprioception
• B. Pressure
• C. Pain
• D. Temperature

Explanation: Pulpal sensory fibers are predominantly free nerve endings that detect potentially damaging stimuli as pain.

• A. free nerve ending in cell rich zone
• B. Meisseners corpuscles at cell rich zone
• C. Krause bulb at the center of the pulp
• D. free nerve ending at sub odontoblastic layer

Explanation: The plexus of Raschkow lies beneath the odontoblast layer, and free nerve endings extend from it toward the odontoblasts and dentinal…

• A. Blood supply
• B. Nerve supply
• C. Lymphatic supply
• D. All of the above

Explanation: Pulp vitality primarily depends on its vascular supply, because interruption of blood flow causes ischemia and necrosis.

• A. Necrosis
• B. Inflammation
• C. Calcific degeneration
• D. Ulceration

Explanation: Inflammation is the initial pulpal response to tissue injury or destruction, as vascular changes and inflammatory cells attempt to contain…

• A. Pulp core
• B. Cell rich zone
• C. Odontoblastic zone
• D. Cell free zone

Explanation: The plexus of Raschkow is a nerve network located in the cell-free zone, immediately beneath the odontoblast layer.

• A. Decreases with age
• B. Increases with age
• C. Increased in some cases and decreases in some cases
• D. None of the above

Explanation: Secondary dentin is deposited throughout life along the walls of the pulp chamber and canal, progressively reducing their size.