Oral Histology MCQs
Oral Histology MCQs are tailored for dentistry students seeking mastery of tooth development and oral tissue structure. These questions focus on enamel formation, dentin-pulp complex, cementum, alveolar bone, and salivary glands. They're excellent for preparation of BDS, MDCAT, and related tests.
Q: Incremental lines in enamel are also referred to as
A) Salter lines
B) Owen lines
C) Schreger lines
D) Retzius lines
✅ Correct Answer: D
Explanation: Striae of Retzius, or incremental lines, are found in enamel and represent rhythmic enamel deposition.
Q: The last layer of enamel formed is called
A) Tubular enamel
B) Nascent enamel
C) Interrod enamel
D) Aprismatic enamel
✅ Correct Answer: D
Explanation: Aprismatic enamel lacks the typical rod structure and is the outermost layer formed by ameloblasts before they degenerate.
Q: Perikymata are seen as
A) Cementum resorption areas
B) Dentin tubule openings
C) Sites of nerve entry
D) Horizontal ridges on enamel surface
✅ Correct Answer: D
Explanation: Perikymata are surface manifestations of striae of Retzius and appear as fine lines on the enamel surface.
Q: The innermost layer of the enamel organ is formed by
A) Ameloblasts
B) Inner enamel epithelium
C) Stellate reticulum
D) Outer enamel epithelium
✅ Correct Answer: B
Explanation: The inner enamel epithelium differentiates into ameloblasts responsible for enamel formation.
Q: The formative phase of amelogenesis involves
A) Enamel maturation
B) Enamel resorption
C) Odontoblast activation
D) Enamel prism formation
✅ Correct Answer: D
Explanation: During the formative stage, ameloblasts produce the enamel matrix, which later mineralizes.
Q: Dentin located closest to the pulp is
A) Secondary dentin
B) Intertubular dentin
C) Peritubular dentin
D) Predentin
✅ Correct Answer: D
Explanation: Predentin is an unmineralized zone adjacent to the pulp, formed before being mineralized into mature dentin.
Q: The neonatal line is found in
A) Primary and permanent enamel
B) Bone tissue
C) All root dentin
D) Cementum only
✅ Correct Answer: A
Explanation: The neonatal line is an accentuated incremental line in enamel and dentin marking the birth-related stress in developing teeth.
Q: Cells responsible for forming alveolar bone are
A) Cementocytes
B) Osteoblasts
C) Ameloblasts
D) Fibroblasts
✅ Correct Answer: B
Explanation: Osteoblasts synthesize the organic matrix of bone and initiate mineralization, forming alveolar bone.
Q: Blood vessels enter the pulp through the
A) Cementoenamel junction
B) Enamel-dentin junction
C) Periodontal ligament
D) Apical foramen
✅ Correct Answer: D
Explanation: The apical foramen is the primary route for blood vessels and nerves to enter the dental pulp.
Q: Odontoblasts originate from the
A) Outer enamel epithelium
B) Stratum intermedium
C) Dental papilla
D) Dental follicle
✅ Correct Answer: C
Explanation: The dental papilla differentiates into odontoblasts, which are responsible for dentin formation.