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Viva Questions and Answers Related to Cementum

  1. What is cementum?
    • Answer: Cementum is a specialized calcified tissue that covers the roots of teeth, providing attachment for the tooth to the surrounding alveolar bone through the periodontal ligament.
  2. What is the primary function of cementum?
    • Answer: The primary function of cementum is to anchor the tooth in the jawbone by providing attachment for the periodontal ligament fibers.
  3. How does cementum differ from enamel?
    • Answer: Enamel is the hard, mineralized tissue covering the crown of the tooth, while cementum covers the tooth roots. Enamel is acellular and does not undergo remodeling, whereas cementum is cellular and capable of continuous remodeling.
  4. What cells are responsible for the formation of cementum?
  5. What is the composition of cementum?
    • Answer: Cementum is primarily composed of hydroxyapatite crystals, collagen fibers, and water.
  6. How does cementum receive its blood supply and nutrients?
    • Answer: Cementum is avascular, meaning it does not have its blood supply. It receives nutrients through diffusion from the surrounding periodontal ligament and adjacent alveolar bone.
  7. What are the two main types of cementum?
    • Answer: The two main types of cementum are acellular (or primary) cementum and cellular (or secondary) cementum.
  8. Where is acellular cementum typically found on the tooth root?
    • Answer: Acellular cementum is typically found near the cementoenamel junction (CEJ) and covers the apical two-thirds of the root.
  9. What is the function of cellular cementum?
    • Answer: Cellular cementum functions in the continuous remodeling and repair of the periodontal ligament and maintains the attachment of the tooth to the bone.
  10. What is the significance of the incremental lines in cementum?
    • Answer: Incremental lines in cementum represent periods of arrested secretion, providing a record of the tooth’s developmental history.
  11. How does cementum respond to orthodontic forces?
    • Answer: Cementum responds to orthodontic forces by undergoing adaptive changes, including the resorption and apposition of mineralized tissue.
  12. What is the role of cementum in tooth sensitivity?
    • Answer: Cementum helps to protect the underlying dentin and pulp from external stimuli. Exposed cementum due to gum recession can lead to tooth sensitivity.
  13. How does cementum repair itself after injury or damage?
  14. What factors can lead to cementum resorption?
    • Answer: Cementum resorption can occur due to inflammatory processes, trauma, or orthodontic movement.
  15. How does aging affect cementum?
    • Answer: With age, cementum undergoes natural remodeling, becoming thicker, and may exhibit increased mineralization.
  16. What is hypercementosis?
    • Answer: Hypercementosis is a condition characterized by excessive cementum deposition on the tooth roots, often leading to an enlarged and bulbous appearance.
  17. How does cementum contribute to the stability of dental implants?
    • Answer: Cementum-like material on dental implants can facilitate the integration of the implant with the surrounding bone, enhancing stability.
  18. Can cementum be regenerated in periodontal therapy?
    • Answer: Current regenerative techniques in periodontal therapy focus on promoting the regeneration of periodontal ligament and bone rather than cementum.
  19. What role does cementum play in the diagnosis of forensic odontology?
    • Answer: Cementum can be used for age estimation in forensic cases by analyzing the incremental lines and thickness, providing insights into the individual’s developmental history.
  20. How does fluoride affect cementum?


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