DHE119 Continue Chapter 2 Quiz3

  1. Function of Fiber Bundles?
    • Brace free gingiva firmly against tooth
    • Reinforce attachment of junctional epithelium to tooth
    • Provide free gingiva rigidity to withstand chewing
    • Unite free gingiva with cementum of root and bone
    • Connect adjacent teeth to each other
  2. (gingival fiber group) Alveologingival (AG)
    Image Upload 1
    • Extend from periosteum of alveolar crest into gingival connective tissue
    • Fiber bundles attach gingiva to bone
  3. (gingival fiber group)circular
    • Encircle the tooth in a ring-like manner coronal to alveolar crest
    • Not attached to cementum of tooth
    • Fiber bundles connect adjacent teeth to each other
    • Image Upload 2 Image Upload 3
  4. (gingival fiber group)dentogingival
    • Embedded in cementum near CEJ
    • Fan out into lingual connective tissue
    • Fibers act to attach gingiva to teeth
    • Image Upload 4
  5. (gingival fiber group) Periostogingival
    • Extend laterally from periosteum of alveolar bone
    • Fibers attach gingiva to bone
    • Image Upload 5
  6. (gingival fiber group) Intergingival
    • Extend in a mesiodistal direction along entire dental arch and around last molars in arch
    • Fiber bundles link adjacent teeth into dental arch unit
    • Wave
    • Image Upload 6 Image Upload 7
  7. (gingival fiber group) Intercircular
    • Encircle several teeth
    • Fiber groups link adjacent teeth into a dental arch unit
    • Image Upload 8 Image Upload 9
  8. (gingival fiber group) Interpapillary
    • Located in papillae coronal to transseptal fiber bundles
    • Fiber groups connect oral and vestibular interdental papillae of posterior teeth
    • Image Upload 10 Image Upload 11
  9. (gingival fiber group) Transgingival
    • Extend from cementum near the CEJ and run horizontally between adjacent teeth
    • Fiber bundles link adjacent teeth into a dental arch unit
    • Image Upload 12 Image Upload 13
  10. (gingival fiber group)Transseptal
    • Pass from cementum of one tooth over the crest of alveolar bone to cementum of adjacent tooth
    • Fiber bundles connect adjacent teeth to one another and secure alignment of teeth in arch
    • Image Upload 14 Image Upload 15
  11. Biologic Width
    The portion of tooth surface covered by junctional epithelium and connective tissue, including supragingival fiber bundles

    • Space on the tooth surface occupied by the JE and the CT attachment fibers apical to the JE.
    • Length of junctional epithelium is about 1 mm(health)
    • Vertical space taken up by supragingival fiber groups is about 1mm in length

    • Biologic width is an important consideration in design of dental restorations and crowns
    • Margin of restoration or crown must never be placed so close to alveolar bone that it encroaches on biologic width
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  12. Periodontal Ligament (PDL)
    • Thin sheet of fibrous connective tissue located between the tooth and its bony socket
    • PDL connects to tooth and bony wall of tooth socket
  13. Components of PDL
    • -Cells:
    •   Fibroblasts
    •   Cementoblasts
    •   Osteoblasts
    • -Extracellular matrix
    • -Blood vessels
    • -Nerve supply
  14. Components in PDL In Health
    • PDL surrounds entire tooth root and fills space between root and bony tooth socket
    • Thickness of PDL varies by age and function:
    • 0.05 to 0.25 mm
  15. Function of PDL:
    • Attaches tooth to bony socket, Suspends tooth so it does not grind on bone during chewing
    • Transmits tactile pressure and pain sensations
    • Supplied with blood vessels that provide nutrients to cementum and bone
    • Contains cementoblasts that produce cementum throughout the life of the tooth
    • Contains osteoclasts that can resorb bone and cementum
  16. What do Fiber Bundles of PDL do?
    Specialized connective tissue surrounding tooth root that connects it to alveolar bone
  17. name the Fiber Bundles of PDL:5
    1.Alveolar crest

    2.Horizontal

    3.Oblique

    4.Apical

    5.Interradicular
  18. Fiber Bundles of PDL
    Alveolar Crest
    • Extend from cervical cementum
    • Run downward in diagonal direction to alveolar crest
    • Fiber group resists horizontal tooth movements
  19. Fiber Bundles of PDL
    Horizontal
    • Located apical to alveolar crest fibers
    • Extend from cementum to bone at right angles to long axis of root
    • Fiber group resists horizontal pressure against crown of tooth
  20. Fiber Bundle of PDL
    Oblique
    • Located apical to horizontal group
    • Extend from cementum to the bone running diagonally
    • Fiber group resists vertical pressures that threaten to drive the root into its socket
  21. Fiber Bundle of PDL
    Apical
    • Extend from apex of tooth to bone
    • Fiber group secures tooth in its socket and resists forces that might lift the tooth from its socket
  22. Fiber Bundle of PDL
    Interradicular
    • Only on multirooted teeth
    • Extends from cementum in furcation area of tooth to interradicular septum of alveolar bone
    • Fiber groups help stabilize tooth in its socket
  23. Image Upload 17
    Image Upload 18
  24. The ends of (Sharpey's fibers) PDL fibers that are embedded in?
    cementum and alveolar bone
  25. Sharpey’s Fibers:
    • Attachment of fiber bundles occur when cementum and bone are forming
    • As cementum forms, tissue hardens around ends of Sharpey’s fibers, surrounding them with cementum
    • Same process as bone forms
    • Image Upload 19
  26. Cementum:
    Calcified layer of connective tissue that covers root of the tooth
  27. Function of Cementum:
    • Seals and covers open dentinal tubules
    • Acts to protect underlying dentin
    • Attaches periodontal fibers to tooth
    • Forms at apical areas of roots to compensate for loss of tooth tissue caused by attrition
  28. Components of Cementum
    • Organic matrix: Densely packed collagen fibers held together with gel matrix
    • Mineralized portion
    • No blood vessels or nerves
  29. Acellular Cementum:
    • First to be formed
    • Covers cervical third or half of root
    • Not produced during the life of the tooth
    • Thickness ranges from 30 to 60 µm(microns)
    • Consists of mostly Sharpey’s fibers
  30. Cellular Cementum
    • Contains cementoblasts and fibroblasts within mineralized tissue
    • Formed after tooth eruption
    • Less calcified than acellular cementum
    • Deposited at intervals throughout the life of the tooth
    • Thickness ranges from 150 to 200 µm
  31. Cemento-Enamel Junction (CEJ)
    60% cementum ________enamel
    • overlap
    • Image Upload 20
  32. Cemento-Enamel Junction (CEJ)

    30% cementum ________ enamel
    • meet
    • Image Upload 21
  33. Cemento-Enamel Junction (CEJ)
    10% ________cementum and enamel
    • gap
    • Image Upload 22
  34. Alveolar Bone:
    Bone of upper or lower jaw that surrounds and supports the roots of teeth
  35. Function of Alveolar Bone:
    • Forms the bony sockets of teeth
    • Supports and protects roots of teeth
  36. Characteristics of Alveolar Bone:
    • Mineralized connective tissue made by? osteoblasts
    • Is rigid because of deposit of calcium salts in extracellular matrix
    • Has blood vessels and nerves
    • Constantly undergoes periods of formation and resorption
  37. Components of Alveolar Bone
    Osteoblasts:
    bone builders initiate mineralization of bone
  38. Components of Alveolar Bone
    Osteoclasts
    bone consumers remove mineralized material and organic matrix
  39. Components of Alveolar Bone
    Extracellular matrix
    • collagen fibers and?
    • gel-like matrix
    • Mineralized portion is calcified by depositing mineral salt hydroxyapatite
  40. Components of Alveolar Bone:
    • Osteoblasts
    • Osteoclasts
    • Extracellular matrix
    • Blood and lymph vessels
    • Nerves
Author
dentalhygiene
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337744
Card Set
DHE119 Continue Chapter 2 Quiz3
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DHE119 Continue chapter2 Quiz3
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