Dental Anatomy

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sthomp88
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55506
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Dental Anatomy
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2010-12-13 15:37:38
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Chapter six
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tooth development and eruption
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  1. tooth development that takes place in many stages
    odontogenesis
  2. What structure in the body has the longest developmental period?
    the teeth
  3. What tooth development stage occurs in the 6th - 7th week?
    Induction - initiation
  4. What tooth development stage occurs in the 8th week?
    bud stage - proliferation
  5. What tooth developmental stage occurs in the 9th - 10th week?
    cap stage - proliferation, differentiation, and morphogenesis
  6. What tooth developmental stage occurs in the 11th-12th weeks?
    bell-stage - proliferation, differentiation, morphogenesis
  7. What physiological processes occur during the apposition stage?
    induction, proliferation
  8. What physiological process occurs during the maturation stage?
    maturation
  9. What physiological process occurs during the initiaion stage?
    induction
  10. What physiological process occurs during the bud stage?
    proliferation
  11. What physiologic process occurs during the cap stage?
    • proliferation
    • differentiation
    • morphogenesis
  12. What physiological process occurs during the bell stage?
    • proliferation
    • differentiation
    • morphogenesis
  13. interactin between embryological tissues, mesenchymal tissues must influence the ectodermal tissue for initiation of odontogenesis, but the mechanisms are unkown. The cells decide what they will become
    induction
  14. tissues that must influence the ectodermal tissues for initiation of odontogenesis.
    mesenchymal tissues
  15. lines the stomodeum, or primitive mouth at the beginning of the sixth week of the embryo
    ectoderm
  16. the outer portion of the ectoderm gives rise to _________ _________. horse shoe shaped arches one for each future jaw
    oral epitherlium
  17. dppe to the oral epithelium, a type of mesenchyme originally from the ectoderm is the_________, whichi is influenced by neural crest cells
    ectomesenchyme
  18. structure that separates the oral epithelium and the ectomesenchyme in the stomodeum
    basement membrane
  19. structure that forms during the later portion of the seventh week when the oral epithelium grows deeper into the ectomesenchyme and is induced to produce this new layer
    dental lamina
  20. the dental lamina begins initially to form in the ______for both arches, and progresses ________
    • midline
    • posteriorly
  21. 10 structures that form during the bud stage of tooth development, and form from extensive proliferation of the dental lamina penetrating into the ectomesenchyme
    tooth bud
  22. true or false. a basement membrane still exists between the tooth bud and the growing ectomesenchyme in the bud stage
    true
  23. each of the buds together with the surrounding ectomesenchyme will develop into a what?
    tooth germ
  24. When does primary dentition develop?
    embryonic and fetal periods
  25. When does the permanent dentition develop?
    during fetal period - can carry on after birth
  26. 3 developmental disturbances in the initiation stage
    • anodontia
    • ectodermal dysplasia
    • supernumerary teeth
  27. lack of initiation; most commonly occurs with the permanent maxillary lateral incisors, third molars, mandibular 2nd premolars
    anodontia
  28. What teeth are most likely to be congenitally missing?
    • maxillary lateral incisors
    • third molars
    • mandibular 2nd premolars
  29. syndrome associated with anodontia; may also be caused by endocrine dysplasia, systemic diseases, excessive radiation exposure
    ectodermal dysplasia
  30. abnormal initiation leading to the development of extra teeth
    supernumerary teeth
  31. Where are places that supernumerary teeth often occur?
    • between maxillary central incisors (mesiodens)
    • distal to maxillary 3rd molars
    • premolar region of both arches
  32. developmental disturbances that occur during the bud stage
    • macrodontia
    • microdontia
  33. abnormal proliferation leading to a single tooth or entire dentition to be larger than normal; hereditary
    macrodontia
  34. single tooth or entire dentition develops smaller than normal; hereditary
    microdontia
  35. microdontia in maxillary lateral incisors
    peg laterals
  36. microdontia in permanent 3rd molars
    peg molars
  37. complete macro and microdontia is rare and can occure due to dysfunction of the ___________ gland
    pituitary
  38. unequal growth in different parts of the tooth bud leading to formation of a cap shape attached to the dental lamina occurs in what stage?
    cap stage
  39. which physiological process is dominent in the cap stage/
    morphogenesis
  40. primordium of tooth develops with a specific form; consists of enamel organ, dental papilla, dental sac, and will develop into primary dentition
    tooth germ
  41. the tooth germ consists of what 3 layers?
    • enamel organ
    • dental papilla
    • dental sac
  42. originally develops from the ectoderm; depression in the deepest part of the dental lamina forming a cap eventually forming enamel for outer surface of the tooth
    enamel organ
  43. mass within the concavity of the cap of the enamel organ; will become the dentin and pulp
    dental papilla
  44. exists between the enamel organ and the dental papilla, and will become the dentinoenamel junction
    basement membrane
  45. condensed mass of ectomesenchyme surrounding the enamel organ; produces peridontium
    dental sac
  46. primoridium of the permanent dentition that is an extension of the dental lamina into the ectomesenchyme
    successional dental lamina
  47. the successional dental lamina always extend into the ectomesenchyme________to the forming primary tooth germs
    lingual
  48. Where do nonsuccedaneous teeth develop from?
    a posterior extension of the dental lamina distal to the primary 2nd molars dental lamina
  49. 4 developmental disturbances in the cap stage
    • dens in dente
    • gemination
    • fusion
    • tubercles
  50. enamel organ abnormally invaginates into the dental papilla; usually leaves the tooth with a deep lingual pit, which can lead to pulpal exposure and pathology and possible endo therapy
    dens in dente
  51. radiographically appears as a tooth within a tooth
    dens in dente
  52. dens in dente commonly affects what teeth?
    permanent maxillary incisors, especially lateral incisor
  53. single tooth germ unsuccessfully attempts to divide into 2, results in a single rooted tooth with a common pulp cavity
    gemination
  54. exhibits 'twining' in crown area
    gemination
  55. where does gemination usually affect?
    in anterior teeth
  56. results from the union of 2 adjacent tooth germs, possibly due to pressure in the area; 2 distinct pulp cavities, but enamel, dentin, and pulp are united
    fusion
  57. where does fusion usually occur?
    anterior teeth of primary dentition
  58. extra cusps or extensions of enamel; may be due to trauma, pressure, metabolic disease
    tubercles
  59. where are tubercles commonly found?
    • mainly on permanent molars; especially 3rd
    • also lingual extensions on the cingulum on permanent maxilary anterior teeth, especially lateral incisors and canines
  60. What physiological process occurs at its furthest extent during the bell stage?
    differentiation
  61. What are the 6 different types of cells found in the bell stage?
    • dental sac
    • outer enamel epithelium (OEE)
    • stellate reticulum
    • stratum intermedium
    • inner enamel epithelium (IEE)
    • inner cells of dental papilla
  62. increasing amounts of collagen fibers forming around enamel organ
    dental sac
  63. the dental sac will differentiate into what?
    periodontium: cementum, perio ligament, alveolar bone
  64. outer cuboidal cells of enamel organ that serve as a protective barrier for enamel organ
    outer enamel epithelium (OEE)
  65. more outer star-shaped cells in many layers, forming a network within the enamel; supports the production of the enamel matrix
    stellate reticulum
  66. more inner layer of flat to cuboidal cells; supports the production of enamel matrix
    stratum intermedium
  67. innermost tall columnar cells of enamel organ
    inner enamel epithelium (IEE)
  68. the inner enamel epithelium differentiates into the ___________ that form _______- _________
    • ameloblasts
    • enamel matrix
  69. outher layer of cells of the dental papilla nearest the IEE; there is a basement membrane between these layers
    Outer cells of dental papilla
  70. outer cells of the denatl papilla will give rise to _________ that form the ______ ______
    • odontoblasts
    • dentin matrix
  71. will differentiate into pulp tissues
    inner cells of dental papilla
  72. final stage of odontogenesis during which enamel, dentin, and cementum are secreted in successive layers
    apposition
  73. enamel, dentin, and cementum are initially secreted as a __________ that is partially calcified and yet serves as a framework for later calcification
    matrix
  74. other final stage which is reached when the dental tissues are fully mineralized
    maturation
  75. developmental disturbances in apposition and maturation phases
    • enamel dysplasia
    • enamel hypoplasia
    • enamel hypcalcification
    • amelogenesis imperfecta
    • dentinogenesis imperfecta
  76. faulty development of the enamel resulting from interference of metabolic processes of the ameloblasts, may involve individual areas, (localized) or large numbers of ameloblasts (systemic)
    enamel dysplasia
  77. results from decreased quantity of enamel matrix, teeth appear pitted and grooved
    enamel hypoplasia
  78. Name 2 type of teeth that result from enamel hypoplasia
    • hutchinson's incisors
    • mulberry molars
  79. incosor crown has a screwdriver shape with notched incisal edge, result of enamel hypoplasia
    hutchinson's incisor
  80. have enamel tubercles on the occlusal surface, result of enamel hypoplasia
    mulberry molars
  81. distrubance results in the reduction of quality of enamel maturation - teeth appear more opaque, yellower, or browner due to intrinsic staining of enamel
    enamel hypocalcification
  82. What are 2 developmental disturbances that may occur together, especially as a result of fluorosis?
    • amelogenesis imperfecta
    • dentinogenesis imperfecta
  83. enamel dysplasia which is hereditary and can affect all teeth of both dentitions
    amelogenesis imperfecta
  84. dentinal dysplasia which may be hereditary
    dentinogenesis imperfecta
  85. during the _____ _____ IEE cells grow even more _________ or elongate as they differentiate into __ _________
    • bell stage
    • columnar
    • pre-ameloblasts
  86. the nuclei of all the cells move away from the center and position themselves farthes away from the basement membrane in the bell stage
    repolarization
  87. What stage does repolarization occur?
    bell stage
  88. Preameloblasts will differentiate into the cells secreting the enamel matrix, preameloblasts will also induce ______ _____ ______ to ____________
    • dental papilla cells
    • differentiate
  89. The outer cells of the dental papilla are induced by the ________ to differentiate into ______________
    • preameloblasts
    • odontoblasts
  90. The odontoblasts are lined up next to the basement membrane in a _____-- ____________ of the preameloblasts
    mirror image
  91. Odontoblasts produce what?
    dentin matrix
  92. Does dentin or enamel formation begin first?
    dentin
  93. Why is the dentin layer slightly thicker than the enamel layer?
    because production of it starts first
  94. When does the basement membrane between the ameloblasts and odontoblasts disintegrate?
    after the differentiation of odontoblasts and formation of predentin, this allows preameloblasts to come into contact with dentin
  95. What induces preameloblasts to differentiate into ameloblasts?
    when the basement membrane disintegrates dentin and enamel come in contact
  96. tapered portion of each ameloblast facing the disintegrating basement layer; secretes enamel matrix
    tome's process
  97. forms as a result of the mineralization of the disintegrating basement membrane and joining of the dentin and enamel matrixes
    dentinoenamel junction
  98. attached cellular extensions in the length of the predentin left by the odontoblasts
    odontoblastic process
  99. Where are the odontoblastic processes contained?
    in a dentinal tubule
  100. Cell bodies of odontoblasts ________ _________ the _________ tissue
    • remain within
    • pulp
  101. Do we keep our ameloblasts?
    no, they are lost with eruption of the tooth
  102. When does root development occur?
    after the crown is completely shaped and the tooth is beginning to erupt

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