271. Tooth buds of permanent mandibular incisors are situated_____________?
A. Lingual to primary teeth
B. Inferior to primary teeth
C. Labial to primary teeth
D. A and B
✅ The correct answer is option D. A and B.
Oral Histology
272. Elongated rete pegs are seen in______________?
A. Alveolar mucosa
B. Floor of the mouth
C. Attached gingiva
D. Buccal mucosa
✅ The correct answer is option C. Attached gingiva.
273. Myoepithelial cells are present in________________?
A. Striated duct
B. Intercalated & terminal duct
C. Serous cells
D. Mucous cells
✅ The correct answer is option B. Intercalated & terminal duct.
274. The type of tertiary dentin which contains cellular inclusions is found in_____________?
A. Sclerotic dentin
B. Mantle dentin
C. Predentin
D. Osteodentin
✅ The correct answer is option D. Osteodentin.
275. Resorption of dental tissue is caused by_____________?
A. Osteoclasts
B. Osteoblasts
C. Odontoclasts
D. Odontoblasts
✅ The correct answer is option C. Odontoclasts.
276. Which of the following statement is true______________?
A. Cementum is thinnest at CEJ (20-50μm)
B. Cementum is thickest towards the apex (150-200μm)
C. The apical foramen is surrounded by cementum
D. All of the above
✅ The correct answer is option D. All of the above.
277. Among various glands, salivary gland secretion is unique in that, its secretions is unique in that, its secretion are controlled by___________?
A. Hormones
B. Nerves
C. Chemicals
D. All of the above
✅ The correct answer is option B. Nerves.
278. In resorption of roots of the primary teeth, the dental pulp_____________?
A. Plays a passive role
B. Becomes a fibrotic non-vital mass
C. Initiates resorption from the inner surface of roots
D. Aids in formation of secondary dentin slowing down resorption
✅ The correct answer is option A. Plays a passive role.
279. The odontoblasts killed during cavity preparation are derived from_____________?
A. Unaffected odontoblasts from the pulp
B. Undifferentiated cells
C. Histocytes
D. Osteoblasts
✅ The correct answer is option B. Undifferentiated cells.
280. The most accepted theory of tooth eruption is____________?
A. Hydrodynamic theory
B. Clone theory
C. Periodontal ligament traction theory
D. Vascular theory
✅ The correct answer is option C. Periodontal ligament traction theory.