All Free Oral Histology MCQs with Answers
Every Oral Histology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
332 questions · page 1 of 17
- A. Osteoclastic activity
- B. Osteoblastic activity
- C. Myeloid activity
- D. Healing activity
Explanation: A reversal line marks the change from bone resorption to bone formation, so it indicates that osteoclastic activity has ceased and…
Correct answer: Osteoclastic activity- A. Tome's fibres
- B. Sharpey's fibres
- C. Ray's fibres
- D. All of the above
Explanation: Sharpey’s fibres are the embedded ends of periodontal ligament fibres that extend into cementum and alveolar bone, anchoring the tooth to…
Correct answer: Sharpey's fibres- A. Alkaline phosphatase and urease
- B. Catalase and phosphorylase
- C. Alkaline phosphatase and phosphorylase
- D. Acid phosphatase and catalase
Explanation: Alkaline phosphatase supports mineral deposition, while phosphorylase participates in carbohydrate metabolism needed during osteoblast…
Correct answer: Alkaline phosphatase and phosphorylase- A. Haversion cone
- B. Howships cone
- C. Cutting cone
- D. Filling cone
Explanation: During osteon remodeling, osteoclasts create the cutting cone and osteoblasts follow behind to deposit new lamellae in the filling cone.
Correct answer: Filling cone- A. Alveolar bone proper
- B. Periosteum
- C. Spongy bone
- D. Endosteum
Explanation: Haversian systems are osteons, the cylindrical structural units of compact bone, and they occur in the compact component of alveolar bone…
Correct answer: Alveolar bone proper- A. Lamina lucida
- B. Lamina densa
- C. Lamina dura
- D. Lamina propria
Explanation: Alveolar bone proper appears as the radiopaque lamina dura lining the tooth socket on an intraoral periapical radiograph.
Correct answer: Lamina dura- A. Osteoclast
- B. Osteoblast
- C. Osteocyte
- D. Osteon
Explanation: The osteon, or Haversian system, is the basic structural and functional unit of compact bone and is organized around a central blood…
Correct answer: Osteon- A. Cortical
- B. Cancellous
- C. Osteophytic
- D. Exophytic
Explanation: The labial bone over the anterior teeth is generally a thin cortical plate, often with little or no cancellous bone between the cortical…
Correct answer: Cortical- A. 1st molar
- B. 2nd premolar
- C. 1st premolar
- D. 2nd molar
Explanation: The maxillary first molar is classically described as having roots in close relation to the floor of the maxillary sinus.
Correct answer: 1st molar- A. Compact bone
- B. Cancellous bone covered by thin layer of compact bone
- C. Cancellous bone
- D. Compact bone covered by cancellous bone
Explanation: The mandibular condyle has a cancellous bony interior covered by a thin compact cortical layer.
Correct answer: Cancellous bone covered by thin layer of compact bone- A. Ramus of the mandible
- B. Lower border of the mandible
- C. That part of the bone embracing apices of root of teeth
- D. That part of the bone containing teeth
Explanation: Basal bone is the portion of jawbone beneath and around the apices of the teeth, supporting the alveolar process.
Correct answer: That part of the bone embracing apices of root of teeth- A. woven bone
- B. Irregular bone
- C. Resorbing bone
- D. Lamellar bone
Explanation: Mature bone is organized into concentric or parallel lamellae and is therefore called lamellar bone.
Correct answer: Lamellar bone- A. Odontoblasts & megakaryocyte
- B. Osteoclasts, osteoblasts, osteoid
- C. Megakaryocytes, osteoblasts, osteoclasts
- D. None of the above
Explanation: Forming bone contains osteoblasts, which produce osteoid, and osteoclasts, which remodel the developing tissue.
Correct answer: Osteoclasts, osteoblasts, osteoid- A. Same as in other parts of alveolar bone
- B. Less than the other parts of alveolar bone
- C. More than the other parts of alveolar bone
- D. Less than the cementum
Explanation: The lamina dura is a dense, highly mineralized part of the alveolar bone proper, so its calcium content is greater than that of the less…
Correct answer: More than the other parts of alveolar bone- A. Support and retention to the complete denture
- B. Boundaries for the tongue during speech
- C. Attachment to muscles of facial expression
- D. Support the natural teeth
Explanation: The alveolar process forms the tooth sockets and provides attachment and support for the natural teeth through the periodontal ligament.
Correct answer: Support the natural teeth- A. Gubernacular canals
- B. Canals of Hirchfeld and Zuckerland
- C. Herversian canals
- D. Volkmann canals
Explanation: Gubernacular canals are small passages on the lingual aspect of primary teeth that guide the eruption path of their permanent successors.
Correct answer: Gubernacular canals- A. 0.10 mm
- B. 0.50 mm
- C. 0.25 mm
- D. 0.75 mm
Explanation: The periodontal ligament has an average width of about 0.25 mm, although it varies with age, tooth function, and location.
Correct answer: 0.25 mm- A. 0.75 mm in thickness
- B. 0.5 mm in thickness
- C. 0.25 mm in thickness
- D. mm in thickness
Explanation: The periodontal ligament is approximately 0.25 mm thick on average, with normal regional variation.
Correct answer: 0.25 mm in thickness- A. Cervical third
- B. Apical third
- C. It has uniform width
- D. Fulcrum of rotation
Explanation: The periodontal ligament is narrowest around the middle third of the root, which corresponds approximately to the fulcrum or center of…
Correct answer: Fulcrum of rotation- A. Periodontal ligament
- B. Gingiva
- C. Alveolar bone
- D. Cementum
Explanation: Cementicles are small calcified bodies commonly found free within, or attached to the cementum in, the periodontal ligament.
Correct answer: Periodontal ligament