Free Histology of Tooth Development MCQs with Answers

• A. 9th week IU
• B. 2nd week IU
• C. 6th week IU
• D. 4th week IU

Explanation: The first visible sign of tooth development is formation of the dental lamina during approximately the sixth intrauterine week.

• A. Change in number of teeth
• B. Ameloblastoma
• C. Hypoplasia
• D. Change in form and shape of the teeth

Explanation: Morphodifferentiation determines the final shape and form of the tooth, so disturbance at this stage produces abnormally shaped teeth.

• A. Pulp only
• B. All of the above
• C. Pulp & Periodontal ligament
• D. Pulp & Dentin

Explanation: The dental papilla forms odontoblasts, which produce dentine, and its remaining central cells form the dental pulp.

• A. Enamel organ
• B. Dental papilla
• C. Stellate reticulum
• D. Dental sac

Explanation: The bud, cap, and bell descriptions primarily reflect successive changes in the shape and growth of the enamel organ.

• A. Dental pulp
• B. Dental sac
• C. Odontoblastic processes
• D. Reduced dental organ

Explanation: Ameloblasts are nourished indirectly through the dental sac or follicle, which supplies the developing tooth organ through its vascular…

• A. Morphogenic stage
• B. Desmolytic stage
• C. Organizing stage
• D. Formative stage

Explanation: During the organizing stage, the inner enamel epithelium induces adjacent dental papilla cells to differentiate into odontoblasts…

• A. Mottled enamel
• B. Amelogenisis stage
• C. Desmolytic stage
• D. Odontodysplasia

Explanation: A moth-eaten, poorly mineralized enamel appearance is characteristic of odontodysplasia, a developmental anomaly affecting enamel and…

• A. Stratum inter medium
• B. Cervical loop
• C. Outer enamel epithelium
• D. Stellate reticulum

Explanation: Hertwig’s epithelial root sheath develops from the cervical loop, where the inner and outer enamel epithelia meet.

• A. Auxillary olfactory sense organ
• B. Ellipsoid/Cigar shaped
• C. All of the above
• D. Undergoes degeneration after 4 months of intrauterine life

Explanation: Jacobson’s organ, or the vomeronasal organ, is an accessory olfactory organ with an elongated cigar-like shape.

• A. Presence of basic ground substanceOrder DNA Kits
• B. Acidic ground substance
• C. Increased mitochondria
• D. Increased ribonucleic acid

Explanation: Osteoblasts are basophilic because their abundant rough endoplasmic reticulum contains large amounts of ribosomal RNA for producing bone…

• A. 100
• B. 75
• C. 50
• D. 25

Explanation: As the cusps approach and penetrate the oral epithelium, eruption may accelerate to roughly 75 μm per day.

• A. Hydrostatic
• B. Masticatory pressure
• C. Oncotic pressure
• D. Vascular pressure

Explanation: Masticatory forces contribute to the loosening and eventual shedding of deciduous teeth after root resorption has begun.

• A. Saline
• B. Xylene
• C. 10% Formalin
• D. 10% alcoholOrder DNA Kits

Explanation: Extracted teeth are commonly fixed and preserved in 10% neutral buffered formalin, which prevents decomposition and maintains tissue…

• A. Alkaline phosphatase
• B. Acid phosphatase
• C. Adenosine triphosphate
• D. Amino peptidase

Explanation: Alkaline phosphatase releases phosphate from organic compounds and promotes formation of hydroxyapatite crystals, making it closely…

• A. Hydrodynamic theory
• B. Periodontal ligament traction theory
• C. Clone theory
• D. Vascular theory

Explanation: The periodontal ligament traction theory attributes eruption to forces generated by fibroblasts and periodontal ligament fibers pulling…

• A. Physiological tooth migration
• B. Passive eruption
• C. Active eruption
• D. None of the above

Explanation: Active eruption is the axial movement of a tooth toward the oral cavity and occlusal plane, helping it reach or close the intermaxillary…

• A. Booster Mechanism
• B. Cartier/s Adenosine Triphosphate theory
• C. Alkaline Phosphatase theory
• D. Seeding theory

Explanation: Epitaxy is crystal growth guided by the surface arrangement of an existing crystal, which is represented in mineralization by the seeding…

• A. Enamel prismatic arrangement
• B. Dentinal tubule arrangement
• C. Primary and secondary dentin
• D. Mineral content

Explanation: Primary and permanent enamel differ in the arrangement and orientation of their enamel prisms, especially near the cervical region.

• A. Succedaneous teeth
• B. Deciduous teeth
• C. Permanent teeth
• D. None of the above

Explanation: The gubernacular canal and its connective-tissue cord are associated with succedaneous permanent teeth, guiding them toward the oral…

• A. Lingual to primary teeth
• B. A and B
• C. Labial to primary teeth
• D. Inferior to primary teeth

Explanation: Permanent mandibular incisor germs develop lingual to their primary predecessors and are initially positioned inferior or apical to them.