Narrowing of periodontal ligament in labially placed mandibular canine with age is due to_____________?

Related Mcqs:

1. Principal fibres of periodontal ligament are attached to_____________?

   A. Alveolar bone proper
   B. Bundle bone
   C. Lamellar bone
   D. Cortical bone

2. A maxillary right canine may be distinguished from a maxillary left canine because ____________?

   A. The root curves to mesial in the apical 1/3rd
   B. The distal half of canine shows more convexity than the mesical half
   C. Facially the cusp tip is placed distal to Bisecting line
   D. Lingually the cervical line slopes mesially

3. The vascular supply of the periodontal ligament is______________?

   A. Greatest in the middle-third of a single rotted tooth
   B. Greatest in the middle-third of a multirooted tooth
   C. A net like plexus that runs closer to the cementum than to the bone
   D. A net like plexus that runs closer to the bone than to the cementum

4. Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known as______________?

   A. Lamina dura
   B. Bundle bone
   C. Lamina propria
   D. Lamina densa

5. A special feature of the periodontal ligament fibroblasts is______________?

   A. The number or organelles
   B. Presence of actin fibres and shape change
   C. size of the cells
   D. Collagen fibre formation

6. Fibres of periodontal ligament embedded in the bone are_____________?

   A. Sharpey’s fibres
   B. Tomes fibres
   C. Elastic fibres
   D. Ray’s fibres

7. The most abundant principle fibre group in periodontal ligament is____________?

   A. Horizontal
   B. Transeptal
   C. Apical
   D. Oblique

8. Periodontal ligament has predominantly_________?

   A. Type II collagen fibres
   B. Oxytalan fibres
   C. Elastic fibres
   D. Type I collagen fibres

9. Periodontal ligament is made up of____________?

   A. Type I collagen
   B. Type I and Type III collagen
   C. Type I and Type II collagen
   D. Type I and Type IV collagen

10. The periodontal ligament is approximately_____________?

    A. 0.25 mm in thickness
    B. 0.5 mm in thickness
    C. 0.75 mm in thickness
    D. mm in thickness