Free Enamel MCQs with Answers

• A. Enamel lamella
• B. Enamel spindles
• C. Enamel tufts
• D. Perikymata

Explanation: Enamel lamellae are thin, leaf-like hypomineralized structures that extend from the enamel surface toward, and sometimes reach, the…

• A. Less than the thickness of enamel
• B. Greater than the thickness of enamel
• C. Equal to the thickness of enimal
• D. None of the above

Explanation: Enamel rods are longer than the apparent enamel thickness because they run in a curved or oblique course from the dentinoenamel junction…

• A. 2.8
• B. 3.8
• C. 4.8
• D. 2.3

Explanation: Mature enamel has a specific gravity of approximately 2.8, reflecting its very high mineral content.

• A. Keratin like fibre
• B. Tono filament
• C. Collagen fibre
• D. Vimentin filament

Explanation: The organic component of enamel includes keratin-like fibrous proteins, although enamel is predominantly mineral.

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

Explanation: Mature enamel has no reparative capacity because ameloblasts are lost after enamel formation and enamel contains no living cells.

• A. Hunter schreger bands
• B. Enamel tufts
• C. Enamel spindles
• D. Enamel lamellae

Explanation: Enamel spindles are extensions of odontoblast processes that cross the dentinoenamel junction, so they are mesodermal in origin rather…

• A. 5 million
• B. 7 million
• C. 9 million
• D. 12 million

Explanation: A maxillary molar contains approximately 12 million enamel rods, reflecting its large crown surface and volume.

• A. Produced by ameloblasts
• B. Found in the region of cusps
• C. Surrounded by inter prismatic enamel
• D. Terminate as rounded process

Explanation: Enamel spindles are trapped odontoblast processes, not structures produced by ameloblasts.

• A. Enamel spindles
• B. Gnarled enamel
• C. Incremental lies of woven
• D. Incremental lines of retzius

Explanation: Gnarled enamel is formed by the intertwining and irregular course of enamel rods near cusp tips and incisal edges, where enamel must…

• A. Thin tuft like structure extending from enamel surface of dentin enamel junction
• B. None of the above
• C. Odontoblastic processes extending into enamel
• D. Tuft like structure arising from dentin-enamel junction towards enamel surface

Explanation: Enamel tufts arise from the dentinoenamel junction and extend a short distance into the enamel as hypomineralized tuft-like structures.

• A. Occlusal surface
• B. Middle third of buccal surface
• C. Middle third of lingual surface
• D. Cervical third of buccal surface

Explanation: Enamel is thickest over the occlusal surface, particularly around cusp regions, because these areas bear the greatest masticatory forces.

• A. Incremental lines of retzius
• B. Enamel rods
• C. Nasmyth's membrane
• D. Pellicle

Explanation: Perikymata are shallow grooves and ridges visible on the external enamel surface where the incremental lines of Retzius reach the surface.