Oral Histology Exam 2

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Oral Histology Exam 2
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2012-03-08 02:50:05
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Oral Histology
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UMN 2012
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  1. Primary bone in the diaphysis of long bones
    Cortical/Compact
  2. Bone subject to bending, torsional, and compressive forces
    Cortical/Compact
  3. Bone subject to primarily compression forces
    Trabecular bone
  4. Greatest strength of which bone is along long axis
    Cortical bone AND Lamellar bone
  5. Periosteum is very important for
    Bone repair
  6. Fibroblasts synthesize
    collagen for bone
  7. Proteoglycans and Hyaluonan are important for
    • Space filling
    • Decorin, biglycan, and versican
  8. Glycosylated proteins include:
    • Alkaline phosphatase - regulate P and Ca dynamics
    • Osteonectin - bridge between collagen and hydroxyapatite
  9. Glycosylated proteins with cell-attachment properties include
    • Fibronectin, vitronecting, and bone sialoprotein
    • Important for RGD domains, bind integrins and influence cell-ECM interaction
    • Seal off sealing zone in osteoclast sites
  10. Gamma-carboxylated (Gla) containing proteins
    • Matrix Gla protein, osteocalcin
    • Regulators of mineralization
  11. Endochondral ossification occurs in conjunction with
    Cartilage template
  12. What induces transcription factors that mediate commitment of early progenitor cells toward a osteoblast phenotype?
    BMP 2/4/7
  13. Osteoblasts produce
    • Alkaline phosphatase
    • Type I collagen
    • Indirectly responsible for mineralization
  14. Osteoblasts are derived from
    • Mesenchymal stem cells during development
    • Bone marrow stem cells postnatally
  15. Osteoblasts stain
    Basophilic b/c they have abundant RER
  16. Osteoblast functions
    • Indirectly responsible for mineralization
    • Indirectly regulate calcium homeostasis
    • Regulate differentiation and activity of osteoclasts
    • Secretion of mixture of bone matrix proteins
  17. Most abundant cells in bone are
    Osteocytes (90%)
  18. Osteocytes are
    Terminally differentiated osteoblasts
  19. Osteoclasts produce _______ to resorb bone
    TRAP (Tartrate-resistance acid phosphatase)
  20. Osteoclasts are found in
    Howships lacunae
  21. Osteoclasts are derived from
    • Large multinucleated cells -- fusion of monocytes and macrophages
    • From pluripotent hematopoietic stem cells in bone marrow that give rise to monocytes and macrophages
  22. RANK essential for ______function
    Osteoclast differentiation and activation
  23. Bone matrix is degraded by
    Enzyme acid phosphatase and cathepsin B
  24. Runx2 is the locus for
    Cleidocranial Dysplasia
  25. Runx2 is ______ regulator of osterix
    Upstream
  26. Bone remodeling takes place:
    on bone surfaces like periosteal, endosteal, haversian canals, and trabecular sufaces
  27. Bone remodeling cycle takes 3-4 months.
    % cortical bone remodeled/yr
    % trabecular
    • 2-5%
    • 10-50%
  28. 5 Phases of Remodeling
    • Activation of osteoclasts
    • Resorption of bone
    • Reversal phase
    • Formation of bone
    • Resting
  29. Bone ____ doesn't depend on alkaline phosphatase but __________ do.
    • Initiation
    • Propagation and ECM mineralization
  30. Where is cementum thickest?
    Apex and interradicular area of multirooted teeth
  31. Lines produced by continuous but phasic deposition of cementum called
    Incremental or resting lines
  32. 2 unique cementum molecules
    • Cementum attachment protein (CAP)
    • IGF
  33. Cementoblasts are derived from
    Dental follicle
  34. Hyaline layer of Hopwell-Smith is also called:
    • Intermediate cementum
    • 1st layer of cementum that is formed by inner cells of HERS and is deposited on the roots surface
    • Deposition occurs before HERS disintegrates
    • Situated between the granular layer of Tomes and secondary cementum that is formed by cementoblasts
  35. Cementum is _____ permeable that other dental tissues
    More
  36. Type of cementum covering root adjacent to dentin
    Acellular cementum
  37. Cellular cementum can be found
    in the apical area and overlying acellular cementum
  38. Acellular cementum
    • Border with dentin is not clearly demarcated
    • Rate of development is slow
    • Incremental lines are close together
    • Precementum layer virtually absent
  39. Cellular cementum
    • Border with dentin clearly demarcated
    • Rate of development fast
    • Incremental lines are far apart
    • Precementum layer present
  40. The organic matrix of cementum is derived from 2 sources:
    • PDL (Sharpey's fibers)
    • Cementoblasts
  41. Extrinsic fibers (cementum) are:
    • Derived from PDL
    • In the same direction as the PDL
  42. Intrinsic fibers (cementum) are:
    • Derived from cementoblasts
    • Parallel to root surface
  43. Acellular Extrinsic Fiber Cementum (AEFC)
    • Primary cementum
    • Located in cervical 1/2 of root
    • Constitutes the bulk of cementum
    • Collagen fibers from Sharpey's but ground substance from cementoblasts
    • Principle tissue of attachment
    • Function in anchoring the tooth
    • Well mineralized
  44. Cellular Intrinsic Fiber Cementum (CIFC)
    • Secondary cementum
    • Starts forming after tooth is in occlusion
    • Majority of fibers organized parallel to root surface
    • Very minor role in attachment
    • Seen in middle to apical 1/3 of root and in interradicular area
    • Adaptation
    • Repair
  45. Secondary Cellular Mixed Cementum
    • Both intrinsic and extrinsic
    • Bulk of secondary cementum
    • Apical portion and interradicular
    • Adaptation
    • Intrinsic fibers uniformly mineralized but extrinsic fibers are variably mineralized with some central unmineralized cores
  46. Acellular Afibrillar Cementum
    • Limited to enamel surface
    • Close to CEJ
    • Lacks collagen so no role in attachment
  47. CEJ - OMG Rule
    • Overlaps enamel - 60%
    • Meets enamel - 30%
    • Gap between cementum and enamel - 10%
  48. What happens as cementum ages
    • Smooth surface becomes irregular due to calcification of ligament fiber bundles where they are attached to cementum
    • Continues deposition with age in apical area (good b/c maintains tooth length. Bad: obstructs foramen)
    • Cementum resorption
  49. Cementum resorption generates
    Reversal lines because it is active for a period of time and then stops for cementum deposition
  50. Cementicles are found in:
    PDL
  51. What causes resorption of dentin and cementum
    Trauma
  52. Result of loss of cementum is
    • Loss of attachment
    • Once there is reparative cementum deposition the attachment is restored
  53. Mandible and maxillay form a groove that is opened toward the surface of the oral cavity (future alveolar process) when?
    During end of 2nd month of fetal life
  54. Alveolar process starts to develop
    Strictly during tooth erupting
  55. Structure of alveolar process
    • Outer cortical plates
    • Inner spongiosa
    • Bone lining alveolus
  56. Alveolar bone proper contains:
    • Perforating fibers from PDL (Sharpey's fibers)
    • OR
    • Just compact bone
  57. Alveolar bone called lamina dura because:
    It appears more radiodense than surrounding supporting bone in xrays
  58. 2 other names for alveolar bone are
    • Lamina dura
    • Bundle bone
  59. Alveolar bone is called bundle bone because:
    • It is perforated by many foramina that transmit nerves and vessels (cribriform plate)
    • Because alveolar process is regularly penetrated by collagen fiber bundles
  60. Lining of alveolus becomes smoother or rougher as one ages?
    Rougher
  61. PDL is thinnest:
    in the middle portion of the root
  62. PDL width increases or decreases with age:
    Decreases
  63. When does PDL form and from what?
    From dental follicle shortly after root development begins
  64. What happens to the PDL as tooth erupts?
    Change in orientation of fibers
  65. Functions of PDL
    • Shock absorber
    • Tooth support
    • Sensory receptor - necessary for proper positioning of the jaw
    • Nutritive
  66. Most abundant cell in PDL
    Fibroblasts (make collagen)
  67. Osteoclasts in PDL are
    critical for periodontal disease and tooth movement
  68. Cementoclasts are found in PDL ONLY in
    pathologic conditions
  69. Types of collagen in PDL
    1, 3, 12
  70. The average diameter of individual collagen fibers in PDL are _____ than other areas of the body due to the shorter half life of PDL fibers
  71. 3 types of PDL fibers
    • Collagen fibers
    • Oxytalan fibers - perpendicular to teeth and adjacent to capillaries, variant of elastic fibers
    • Eluanin - variant of elastic fibers
  72. Fibers of dentoalveolar group of PDL
    • Alveolar crest group
    • Horizontal group
    • Oblique group (most numerous)
    • Interradicular group
    • Sharpeys fibers - at each end, fibers embedded in bone and cementum
  73. Fibers of Gingival group of PDL
    • Dentogingival (most numerous) - cementum to gingiva
    • Alveologingival - alveolar bone to gingiva
    • Circular - not attached to tooth, around neck of tooth
    • Dentoperiosteal - runs apically from cementum over outer cortical plate to alveolar process or muscle or floor of mouth
    • Transseptal - from cementum to cementum, over alveolar crest
  74. What is the function of oxytalan fibers?
    To regulate vascular flow in relation to tooth function
  75. Oxytalan fibers are most numerous in
    Cervical area
  76. Blood supply to teeth is higher in posterior or anterior?
    Mandibular or maxillary?
    Posterior; Mandibular
  77. Oxytalan fibers are associated with
    Neural elements
  78. Which tooth region contains more nerve endings? (Except maxillary incisors)
    Apical region
  79. What is the major GAG in ground substance of PDL?
    Dermatan sulfate
  80. Ground substance is a major constituent of
    PDL
  81. How much water is in ground substance
    70%
  82. What happens when function of ground substance is increased vs. decreased?
    • Increased = PDL increased in size and fiber thickness
    • Decreased = PDL narrows and fiber bundles decrease in # and thickness
    • Decrease happens due to increased cementum deposition
  83. Phases of Tooth Eruption
    • Preeruptive - from initiation and formation to initiation of root formation
    • Eruptive - from initiation of root formation to occlusal contact
    • Posteruptive - after occlusal contact
  84. Stages of eruptive phase
    • Root formation
    • Movement
    • Penetration
    • Occlusal contact
  85. Why do developing crowns move constantly in jaws during preeruptive phase?
    To place teeth in position for eruptive movement.
  86. What are the two types of movement during the preeruptive phase?
    • Total bodily movement
    • Movement where one part remains fixed while rest continues to grow leading to a change in the center of the tooth germ
  87. Rates of tooth eruption depend on phase of movement. Which is faster, intraosseous phase or extraosseous phase?
    • Extraosseus - 75micrometers /day
    • Intraosseous is only 1-10
  88. Mechanisms of Eruptive Tooth Movement
    • Root Formation
    • Bone Remodeling
    • Dental Follicle
    • PDL
  89. Reasons for Post eruptive tooth movement
    • To accomodate growing jaws
    • To compensate for continued occlusal wear (cementum growth at root apex)
    • To accomodate interproximal wear - mesial drift (controlled by shortening of transseptal fibers and more)
  90. Mesial drift controlled by
    • Shortening of transseptal fibers
    • Adaptability of bone tissue (side of pressure on PDL causes bone resorption, pull on fibers causes bone formation)
    • Anterior compartment of occlusal force due to mesial inclination
    • Pressure from soft tissues like buccal mucosa and tongue
  91. Active eruption compensates for
    incisal and occlusal wear
  92. Passive eruption due to
    gradual recession of the gingiva and underlying alveolar bone
  93. 2 phases of hard tissue resorption
    • Extracellular phase
    • Intracellular phase
  94. Functions of oral mucosa
    • Protection
    • Sensation
    • Secretion
    • Thermal regulation (in dogs not humans)
  95. 3 types of oral mucosa
    • Masticatory (keratinized, 25%)
    • Lining (non keratinized, 60%)
    • Specialized (15%)
  96. Factors affecting color of oral mucosa
    • Concentration and state of dilation
    • Thickness of epithelium
    • Degree of keratinization
    • Amount of melanin pigmentation
  97. Fordyces disease
    Sebaceous glands in oral cavity, predominantly in upper lip, buccal mucosa, and alveolar mucosa
  98. Interface between epithelium and CT of oral mucosa is made of a structureless layer called
    basement membrane
  99. Basement membrane interface of oral mucosa is irregular and composed of downward projections called ______ and upward projections called _______.
    • Rete ridges/pegs
    • Connective tissue papillae
  100. Junction between ___ and lamina propria is more obvious than that between lamina propria and submucosa.
    Epithelium
  101. Submucosa contains
    • loose fat and glandular tissue
    • Provides flexibility
  102. The gingiva and hard palate do not have which layer of tissue?
    • submucosa.
    • Tissue instead called mucoperiosteum
  103. Which tissue turns over faster? keratinized or nonkeratinized?
    Nonkeratinized
  104. Components of lining mucosa:
    • Stratum basale - cuboidal cells, progenitor cells that divide and provide new cells by mitotic division that migrate to the surface
    • Stratum spinosum/intermedium - oval, bulk of epithelium
    • Stratum superficiale - flat, small oval nuclei, continuously shed
  105. What is eleidin?
    Transparent, semi-fluid substance present in stratum lucidum of skin epithelium - helps make lips red
  106. Masticatory mucosa layers
    • Stratum basale and spongiosum - same as nonkeratinized
    • Stratum granulosum - contains keratohyaline granules
    • Stratum corneum - thin, flat nonnucleated cells which are filled with keratin
  107. Parakeratinized epithelium ___ nuclei, whereas orthokeratinized epithelium ______ their nuclei.
    • Keep
    • Lose
  108. Rete pegs are what shape in keratinized epithelium
    long and slender
  109. What type of epithelium is on gingiva
    Thick orthokeratinized or parakeratinized epithelium
  110. What is stippling in gingiva?
    In healthy attached gingiva, appears as small pits in epithelium - due to deep rete pegs
  111. Free gingiva is/is not stippled?
    NOT
  112. Attached gingiva is/is not stippled?
    IS
  113. Dentogingival junction is important because
    it's where oral mucosa meets surface of tooth and is a weak area in the oral mucosa which is otherwise continuous
  114. Which type of epithelium lines the wall of the gingival sulcus?
    Nonkeratinized stratified squamous epithelium
  115. Junctional epithelium is derived from:
    Reduced enamel of the tooth germ
  116. How is junctional epithelium attached?
    • To enamel by internal basal lamina
    • To CT by external basal lamina
    • Hemidesmosomes are present in both basal laminas
  117. What readily regenerates from the sulcular epithelium or oral epithelium if its damaged or surgically extracted?
    Junctional epithelium
  118. What is present in the CT of gingiva that is different from normal oral mucosa?
    Neutrophils
  119. What is Col?
    • A depression
    • Col epithelium is identical to junctional epithelium and has same origin and is also continuously replaced by cell division
  120. Hard palate epithelium is:
    Orthokeratinized (some parakeratinized)
  121. Ducts of von Ebner empty into
    Circumvallate grooves
  122. Which type of specialized mucosa does not contain taste buds?
    Filiform papillae
  123. Which type of specialized mucosa is most numerous?
    Filiform
  124. Nerves for taste buds arise from ________ in anterior tongue and ________ in posterior tongue
    • Chorda tympani (VII)
    • Glossopharyngeal
  125. Epiglottis and larynx innervated by
    vagus nerve
  126. Taste buds made up of 4 types of cells (Types 1-4), Distribution is:
    • Type 1 dark cell - 60%
    • Type 2 light cells - 30%
    • Type 3 - 7%
    • Type 4 - 3% (basal cells)
  127. Locations of taste sensations
    • Sweet and salty - anterior tongue
    • Sour - lateral tongue
    • Bitter - region of circumvallate and soft palate
  128. Epithelial cell-cell contact is made through desmosomes. In the oral cavity is appears discoid and is called:
    Macula adherens
  129. Pemphigus vulgaris is what?
    Autoimmune disorder that involves blistering of mucous membranes
  130. 3 Major nonkeratinocytes in oral epithelium that are clear with a halo around nuclei:
    1 that isnt clear.
    • Langerhans cells - found on stratum spinosum, antigen trapping, dendritic, no desmosomes/tonofilaments
    • Merkel cell - in basal cell layer (mostly in gingiva), touch receptors, non dendritic, sparse desmosomes/tonofilaments
    • Melanocytes - basal cells, melanin producing, dendritic

    Lymphocytes and leukocytes aren't clear cells, associated with inflammatory response
  131. Layers of lamina propria in oral mucosa:
    • Superficial papillary layer (associated with rete ridges)
    • Deeper reticular layer (between papillary and deeper structures)
  132. Parotid gland is a __ gland. Which duct?
    • Serous
    • Stensen's duct
    • Largest salivary gland
    • 25% of total saliva
  133. Sublingual gland
    • Mucous
    • Smallest
    • Anterior floor of mouth
    • 5% of total saliva
    • Viscous saliva
    • Ducts of Rivinus; duct of Bartholin
  134. Submandibular gland
    • Mixed sero-mucous
    • 60% of total saliva
    • More mucinous
    • Wharton's duct
  135. Glands of Blandin-Nuhn are found ________. Glands of Weber are found ________.
    • Ventral tongue
    • Posterior lateral tongue
  136. Embryologic origin of parotid is_________.
    Embryologic origin of sublingual and submandibular glands is ____________.
    • Ectoderm
    • Foregut endoderm
  137. Salivary glands form by process called
    Branching morphogenesis
  138. Zymogen granules are precursors to
    Salivary amylase
  139. 2 stages of saliva
    • Primary saliva - isotonic, contains mostly organic component and water
    • Modified saliva - hypotonic, striated and terminal ducts, reabsorption and secretion of electrolytes
  140. NE via A-adrenergic receptors and substance P can activate what pathway in mouth?
    Ca2+ phospholipid pathway
  141. Bicarb is transported into lumen via
    Apical Cl- channels
  142. Excretory portion of salivary ductal system lies
    in CT septa between lobules
  143. Path of saliva from duct:
    Acinar cells --> intercalated ducts --> striated ducts --> excretory ducts
  144. Which are larger, striated or intercalated ducts?
    Striated
  145. Striated ducts secrete a hypotonic solution with what ion balances?
    • Low Na and Cl
    • High K
  146. What is the role of hormones on saliva?
    Modify saliva content but can't initiate salivary flow
  147. Events of repair/regeneration:
    • Disruption of mucosa
    • Hemorrhage and fibrin formation
    • Vasoconstriction for protection
    • Hemostasis (clotting)
    • Scaffold for repair
    • Vasodilation
  148. Inflammatory response
    • Neutrophils - 1st response, kill bacteria and everything else
    • Macrophages - 2nd, chemotaxis, release of growth factors, cytokines bring lymphocytes
    • Mast cells - source of proinflammatory mediators
  149. What protein gets secreted in repair process?
    Integrins
  150. Why is it difficult for tissue to heal in periodontal disease?
    • Because of the loss of connective tissue - MAIN PROBLEM
    • causes migration of junctional epithelium
  151. Types of joints
    • Cartilagenous
    • Fibrous
    • Synovial
  152. Describe TMJ
    Synovial, sliding, ginglymoid joint
  153. Embryology of TMJ
    • Primary - Meckels cartilage
    • Secondary - starts developing at 3 months gestation - 2 blastemas -temporal and condylar (temporal first so condylar grows towards temporal)

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