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Viva Question and Answers in Periodontal Ligament

Here are 30 viva questions and answers related to the periodontal ligament:

  1. What is the periodontal ligament (PDL)?
    • The PDL is a connective tissue that surrounds and attaches teeth to the alveolar bone within the sockets.
  1. What are the functions of the periodontal ligament?
    • It supports the tooth in the socket, provides sensory feedback, maintains homeostasis in the periodontium, and facilitates tooth movement.
  1. What is the composition of the periodontal ligament?
    • The PDL consists of collagen fibers, cells (fibroblasts, osteoblasts, cementoblasts), blood vessels, nerves, and ground substance.
  1. What is the role of fibroblasts in the periodontal ligament?
    • Fibroblasts produce collagen fibers and ground substance, contributing to the structural integrity and elasticity of the PDL.
  1. How does the periodontal ligament aid in tooth eruption?
    • The PDL plays a crucial role in tooth eruption by providing a pathway for the developing tooth and aiding in bone remodeling.
  1. What is the Sharpey’s fibers?
  1. What is the significance of the blood vessels in the periodontal ligament?
    • Blood vessels supply nutrients to the PDL, support cellular activities, and contribute to the healing process.
  1. How does the periodontal ligament respond to orthodontic forces?
    • The PDL remodels in response to orthodontic forces, facilitating tooth movement by bone resorption and deposition.
  1. Explain the proprioceptive function of the periodontal ligament.
    • The PDL provides sensory feedback, helping in the awareness of tooth position, pressure, and forces during biting and chewing.
  1. What is the role of cementoblasts in the periodontal ligament?
    • Cementoblasts produce cementum, which helps anchor the Sharpey’s fibers and provides attachment for the PDL fibers.
  1. How does the periodontal ligament contribute to the defense against bacterial invasion?
    • The PDL’s immune response includes the presence of various cells that can defend against bacterial invasion.
  1. What are the clinical implications of a damaged periodontal ligament?
  1. How does the periodontal ligament respond to trauma?
    • Trauma may cause inflammation and affect the PDL, leading to symptoms such as tooth mobility and pain.
  1. What is the role of the periodontal ligament in maintaining tooth stability?
    • The PDL absorbs and distributes occlusal forces, contributing to tooth stability and preventing damage to the surrounding structures.
  1. How does age affect the periodontal ligament?
    • With age, the PDL undergoes changes, such as decreased cellularity and alterations in collagen composition, impacting its function.
  1. What is the role of the periodontal ligament in the maintenance of alveolar bone density?
  1. How does the periodontal ligament contribute to the repair of damaged tissues?
    • The PDL has regenerative capabilities and plays a role in the repair of damaged tissues in the periodontium.
  1. What is the effect of systemic conditions like diabetes on the periodontal ligament?
    • Systemic conditions can affect the health of the PDL, potentially leading to compromised tooth support and increased susceptibility to periodontal disease.
  1. What is the role of the periodontal ligament in the maintenance of the gingival attachment?
    • The PDL fibers extend into the gingiva, contributing to the attachment between the tooth and the gingival tissues.
  1. How does the periodontal ligament respond to orthodontic relapse?
  1. What is the relationship between the periodontal ligament and the dental pulp?
    • The PDL and dental pulp share a close anatomical and functional relationship, with blood vessels and nerves connecting the two tissues.
  1. How does inflammation in the periodontal ligament contribute to periodontal disease?
    • Inflammation in the PDL can lead to the breakdown of collagen fibers, bone resorption, and ultimately contribute to periodontal disease.
  1. What is the significance of the hyaluronic acid in the periodontal ligament?
    • Hyaluronic acid in the PDL contributes to tissue hydration and lubrication, aiding in the movement of collagen fibers during orthodontic tooth adjustment.
  1. How does the periodontal ligament contribute to the formation of the periodontal space?
    • The PDL creates the periodontal space, a fluid-filled area between the tooth and the alveolar bone, facilitating nutrient exchange and tissue health.
  1. Explain the role of the periodontal ligament in the maintenance of occlusal relationships.
    • The PDL helps in maintaining proper occlusal relationships by absorbing and distributing occlusal forces during biting and chewing.
  1. How does malocclusion affect the periodontal ligament?
  1. What is the role of the periodontal ligament in the regeneration of lost cementum?
    • The PDL is involved in the regeneration of cementum through the activity of cementoblasts, aiding in the repair of damaged tooth-supporting structures.
  1. How does the periodontal ligament respond to changes in occlusion?
    • Changes in occlusion can lead to adaptive responses in the PDL, affecting tooth position and occlusal relationships.
  1. What is the impact of smoking on the periodontal ligament?
    • Smoking can negatively impact the health of the periodontal ligament, leading to increased risk of periodontal disease and impaired healing.
  1. Explain the role of the periodontal ligament in the maintenance of tooth vitality.

Remember, these questions and answers are meant for educational purposes, and the depth of the responses may vary based on the level of study or expertise.

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