INBDE Oral Biology and Histology 3

Question 1

Which type of dentin is formed in response to irritation or injury?

Accepted Answer

Tertiary (reparative) dentin

Answer

Tertiary (reparative) dentin is produced by newly differentiated odontoblast-like cells as a protective response to local stimuli such as caries or trauma.

Question 2

The principal fiber group that resists intrusive forces on a tooth is:

Accepted Answer

Oblique fibers

Answer

Oblique fibers are the most numerous PDL fibers and are oriented at 45° to resist vertical (intrusive) occlusal forces by converting them into tensile forces on alveolar bone.

Question 3

Amelogenesis imperfecta primarily affects which aspect of tooth development?

Accepted Answer

Enamel matrix formation and/or mineralization

Answer

Amelogenesis imperfecta is a hereditary condition affecting the quantity and/or quality of enamel due to defects in enamel matrix proteins or their regulation.

Question 4

Which enzyme found in saliva initiates carbohydrate digestion?

Accepted Answer

Salivary amylase (ptyalin)

Answer

Salivary amylase (ptyalin) cleaves alpha-1,4 glycosidic bonds in starch, initiating carbohydrate digestion in the oral cavity.

Question 5

The zona pellucida of the enamel organ is also known as:

Accepted Answer

Stellate reticulum

Answer

The stellate reticulum is the star-shaped cell layer of the enamel organ that provides a cushioning effect and nutrition to the inner enamel epithelium.

INBDE - Integrated National Board Dental Exam Practice Test

INBDE - Integrated National Board Dental Exam Practice Test

INBDE Oral Biology and Histology 3