All Free Oral Histology MCQs with Answers

• A. Dental lamina
• B. Hertwig's root sheath
• C. Enamel organ
• D. All of the above

Explanation: The stellate reticulum is the star-shaped, fluid-rich cell layer within the enamel organ.

• A. Bell-bud-cap
• B. Cap-bell-bud
• C. Bell-cap-bud
• D. Bud-cap-bell

Explanation: The tooth germ develops sequentially through the bud, cap and bell stages.

• A. Histodifferentiation
• B. Morphodifferentiation
• C. Apposition
• D. Initiation

Explanation: Histodifferentiation determines the specialized functions of odontoblasts and ameloblasts; its disturbance can cause atypical dentin or…

• A. Dental sac
• B. Odontoblastic process
• C. Ree
• D. Dental Papilla

Explanation: Once the first enamel layer and dentin are present, ameloblasts receive nutrients indirectly from vessels of the dental sac through the…

• A. Enamel knot
• B. Enamel cord
• C. Enamel Cuticle
• D. Both A and B

Explanation: The enamel knot and enamel cord are temporary signalling and structural features of the enamel organ before enamel deposition.

• A. Vestibular lamina
• B. Successional lamina
• C. Dental lamina
• D. Basal lamina

Explanation: The lip furrow band is the vestibular lamina, an epithelial thickening that later contributes to formation of the oral vestibule.

• A. Amelogenisis imperfecta
• B. Oligodontia
• C. Enamel hypoplasia
• D. Dentinogenesis imperfecta

Explanation: Initiation and proliferation defects affect the number of developing tooth germs, producing conditions such as oligodontia.

• A. Gives rise to cementoblasts that produce cementum of the root
• B. Given rise to odontoblasts that lay down dentin of the root
• C. Moulds the shape of roots and stimulates differentiation of odontoblasts
• D. Remians as an essential constituents of the periodontal ligament

Explanation: Hertwig's epithelial root sheath determines root shape and induces adjacent dental papilla cells to differentiate into odontoblasts, which…

• A. Forebrain
• B. Rathke's pouch
• C. Odontoblasts
• D. Neural crest cells

Explanation: The dental lamina forms through epithelial-mesenchymal interaction initiated by signals from neural crest-derived ectomesenchyme.

• A. Epithelial diaphragm
• B. Cell rests of Malassez
• C. Toot bud division or bell stage
• D. None of the above

Explanation: In multirooted teeth, the epithelial diaphragm develops folds or extensions that divide the root region into separate root canals and…

• 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…