INBDE Oral Biology and Histology

Question 1

Which cells are primarily responsible for producing dentin?

Accepted Answer

Odontoblasts

Answer

Odontoblasts are the cells that synthesize and secrete the organic matrix of dentin throughout life.

Question 2

What is the primary inorganic component of enamel?

Accepted Answer

Hydroxyapatite

Answer

Hydroxyapatite crystals [Ca10(PO4)6(OH)2] make up approximately 96% of the inorganic content of mature enamel.

Question 3

Which structure connects the enamel organ to the oral epithelium during tooth development?

Accepted Answer

Dental lamina

Answer

The dental lamina is the band of epithelium that connects the developing enamel organ to the oral epithelium.

Question 4

Hunter-Schreger bands in enamel are best described as:

Accepted Answer

Alternating zones of enamel rods cut in different planes

Answer

Hunter-Schreger bands are optical phenomena produced by the alternating direction of enamel rods when viewed in reflected light.

Question 5

Which zone of the dental pulp contains the highest concentration of collagen fibers?

Accepted Answer

Pulp core

Answer

The pulp core (central zone) contains the largest blood vessels and nerves and has the highest density of collagen fibers.

INBDE - Integrated National Board Dental Exam Practice Test