Periodonlogy 4dd Dr.Sin Sowatha & Dr.Lim Sokun 448qcm

448 Questions | Total Attempts: 50

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Periodonlogy 4dd Dr.Sin Sowatha & Dr.Lim Sokun 448qcm

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Questions and Answers
  • 1. 
    Which of the following structures is NOT part of the enamel organ?
    • A. 

      Odontoblast layer

    • B. 

      Stellate reticulum

    • C. 

      Stratum intermedium

    • D. 

      Stellate reticulum Odontoblast layer

  • 2. 
    Which portion of the tooth germ is the primary source of the periodontal ligament?
    • A. 

      Dental follicle

    • B. 

      Hertwig's epithelial root sheath

    • C. 

      Stratum intermedium

    • D. 

      Dental follicl Stratum intermedium

  • 3. 
    Which portion of the tooth germ is the primary source of the junctional epithelium?
    • A. 

      Stratum intermedium

    • B. 

      Outer enamel epithelium

    • C. 

      Stellate reticulum

    • D. 

      Stellate reticulum, Stratum intermedium

  • 4. 
    Which of the following structures does not belong to the periodontal tissues?
    • A. 

      Basal bone

    • B. 

      Alveolar bone

    • C. 

      Cementum

    • D. 

      Alveolar bone Cementum

  • 5. 
    Basal bone is not part of the periodontium, as it is located under the alveolar process that houses the dentition. Following completion of amelogenesis in humans, the anatomic crown is lined with a layer of reduced enamel epithelium. This layer is derived primarily from which of the following?
    • A. 

      Stratum intermedium and ameloblast layer

    • B. 

      Outer enamel epithelium and stellate reticulum

    • C. 

      Stellate reticulum and stratum intermedium

    • D. 

      Stellate reticulum and stratum intermedium&Stratum intermedium and ameloblast layer

  • 6. 
    In the presence of HEAVY function the periodontal ligament undergoes certain changes as compared to a ligament in light function. Which of the following statements best describes these changes?
    • A. 

      Increased width and increased cellularity

    • B. 

      Decreased width and increased cellularity

    • C. 

      Increased width and decreased cellularity

    • D. 

      Decreased width and increased cellularity Increased width and decreased cellularity

  • 7. 
    Which of the following tissues is the MOST likely source of cementogenic cells in adults who have undergone root planing?
    • A. 

      Periodontal ligament

    • B. 

      Bone marrow

    • C. 

      Residual cementum patches

    • D. 

      Bone marrow Periodontal ligament

  • 8. 
    Which of the following fiber groups DO NOT contribute to tooth anchorage?
    • A. 

      Intergingival fiber group

    • B. 

      Periapical fiber group

    • C. 

      Horizontal fiber group

    • D. 

      Periapical fiber group, Horizontal fiber group

  • 9. 
    Which of the following statements about periodontal probing is MOST accurate?
    • A. 

      Generally overestimates anatomic sulcus or pocket depth

    • B. 

      Generally underestimates anatomic sulcus or pocket depth

    • C. 

      Generally accurately measures anatomic sulcus or pocket depth

    • D. 

      Generally underestimates anatomic sulcus or pocket depth,Generally overestimates anatomic sulcus or pocket depth

  • 10. 
    Which of these collagen types are NOT found in the periodontal ligament?
    • A. 

      Type II

    • B. 

      Type I

    • C. 

      Type IV

    • D. 

      Type I Type II

  • 11. 
    Which of these cell combinations are responsible for the production of acellular extrinsic fiber cementum?
    • A. 

      Cementoblasts and periodontal ligament fibroblasts

    • B. 

      Cementoblasts and cell rests of Malassez

    • C. 

      Cementoblasts and osteoblasts

    • D. 

      Cementoblasts and cell rests of Malassez Cementoblasts and osteoblasts

  • 12. 
    The narrowest zone of gingiva is found in the region of?
    • A. 

      The buccal surface of the mandibular canine and first premolar

    • B. 

      The buccal surface of the maxillary first molar

    • C. 

      The lingual surface of the mandibular first molar

    • D. 

      The buccal surface of the maxillary first molar The lingual surface of the mandibular first molar

  • 13. 
    The gingival groove, when present, is a good indicator of ?
    • A. 

      Neither of the above

    • B. 

      Gingival health

    • C. 

      Location of the gingival sulcus bottom

    • D. 

      Gingival healthLocation of the gingival sulcus bottom

  • 14. 
    The retrocuspid papilla is ?
    • A. 

      A mucosal projection located lingual to the mandibular canines

    • B. 

      A pathologic alteration of the interdental gingiva between the mandibular canines and first premolar

    • C. 

      A gingival anomaly associated with periodontal pockets

    • D. 

      A mucosal projection located lingual to the mandibular canines A pathologic alteration of the interdental gingiva between the mandibular canines and first premolar

  • 15. 
    Which of the following is the most permeable portion of the gingival epithelium?
    • A. 

      The junctional epithelium

    • B. 

      The sulcular epithelium

    • C. 

      The oral epithelium

    • D. 

      The sulcular epithelium The oral epithelium

  • 16. 
    Which of the following is not a gingival fiber group?
    • A. 

      Alveolar crest

    • B. 

      Semicircular

    • C. 

      Transsepta

    • D. 

      Semicircular, Alveolar crest Transsepta

  • 17. 
    Anchoring fibrils are found?
    • A. 

      In the connective tissue adjacent to the lamina densa

    • B. 

      Between the lamina densa and the lamina lucida

    • C. 

      Between the epithelial cell surface and the lamina lucida

    • D. 

      Between the lamina densa and the lamina lucida Between the epithelial cell surface and the lamina lucida

  • 18. 
    The lamina densa contains what type of collagen?
    • A. 

      Type IV

    • B. 

      Type I

    • C. 

      Type VII

    • D. 

      Type IType IV

  • 19. 
    The anchoring fibrils are composed of what type of collagen?
    • A. 

      Type VII

    • B. 

      Type I

    • C. 

      Type IV

    • D. 

      Type I Type IV

  • 20. 
    The term epithelial attachment properly refers to ?
    • A. 

      The interface of the junctional epithelium with the tooth

    • B. 

      Junctional epithelium

    • C. 

      The hemidesmosomes of basal cells

    • D. 

      Junctional epithelium , The interface of the junctional epithelium with the tooth

  • 21. 
    The average width of the periodontal ligament around a functional permanent tooth is ?
    • A. 

      0.2 - 0.3 mm

    • B. 

      0.5 - 1.0 mm

    • C. 

      0.03 - 0.05 mm

    • D. 

      0.2 - 0.3 mm, 0.03 - 0.05 mm

  • 22. 
    Which of the following has the highest rate of desquamation (i.e. number of cells shed per unit surface area) ?
    • A. 

      Junctional epithelium

    • B. 

      Oral epithelium

    • C. 

      Sulcular epithelium

    • D. 

      Oral epithelium Sulcular epithelium

  • 23. 
    Anchorage of the tooth to the alveolar process is mediated through which of the following?
    • A. 

      Sharpey's fibers

    • B. 

      Transseptal fibers

    • C. 

      Oxytalan fibers

    • D. 

      Transseptal fibers Oxytalan fibers

  • 24. 
    The cell rests of Malassez are?
    • A. 

      Cells derived from odontogenic epithelium

    • B. 

      Endothelial cell remnants

    • C. 

      Glandular elements secreting gingival fluid

    • D. 

      Cells derived from odontogenic epitheliu Endothelial cell remnants

  • 25. 
    The alveolus is lined with?
    • A. 

      A cribriform plate of compact bone

    • B. 

      A cancellous bone surface

    • C. 

      A continuous layer of Haversian bone

    • D. 

      A cribriform plate of compact bone A cancellous bone surface

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