Dental Anatomy - Test 1

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Dental Anatomy - Test 1
2010-08-23 18:54:47
Dental anatomy

Covers material for Test 1
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  1. Functions of human teeth
    • Mastication
    • Esthetics
    • Phonetics
  2. Peridontium
    Tooth-supporting structure (includes both hard and soft)
  3. Shape of the first tooth crown, and which organism is it found?
    Conical; primitive vertebrates, ie reptiles
  4. What terms describes an organism with similar tooth structure?
  5. What term describes a 3-lobed structure?
  6. How many lobes do human teeth possess?
  7. Define a lobe
    A primary division of a tooth, separated by developmental grooves
  8. Name the lobes of the anterior teeth
    • Mesiolabial
    • Middle labial (sometimes refered to as labial)
    • Distolabial
    • Lingual
  9. Name the lobes of the premolars (except mandibular 2nd)
    • Mesiobuccal
    • Middle buccal
    • Distobuccal
    • Lingual
  10. Which teeth have 5 lobes?
    • Mandibular 2nd premolar
    • Mandibular 1st molar
  11. What purpose do the dental arches and their arrangements serve?
    • Efficient use of force for mastication
    • Stabilization and protection of arches
  12. Curve of Spee
    Anterior to posterior upwards curvature from the facial aspect
  13. Curve of Wilson
    Medio-lateral curvature of the occlusal plane of the posterior teeth; complements condyles during mandibular movement
  14. Compensating occlusal curvature
    • Combination of curves of Spee/Wilson
    • AKA Sphere of Monson
  15. What is the axial position?
    Describes the inclination of the tooth with respect to the verticle axis
  16. Describe axial position of:
    Maxillary Anteriors
    • Incisors - slight mesial, great lingual
    • Canines - slight distal, great lingual
  17. Describe axial position of:
    Maxillary Premolars
    • Slight lingual
    • Slight distal
  18. Describe axial position of:
    Maxillary Molars
    • Great lingual
    • Moderate distal
  19. Describe axial position of:
    Mandibular Anteriors
    • Incisors - great lingual, none/slight mesial
    • Canines - great lingual, slight distal
  20. Describe axial position of:
    Mandibular Premolars
    • Slight distal
    • First premolar - slight lingual
    • Second premolar - slight buccal
  21. Describe axial position of:
    Mandibular Molars
    Moderate to great buccal and distal
  22. What is the function of the contact areas?
    • Stabilize dental arch
    • Prevent food from packing
  23. Rules of contact areas
    • More cervically located towards posterior
    • Distal one more cervical than mesial
    • Area increases posteriorly
    • Anterior are centered faciolingually
    • Posterior are buccal faciolingually
  24. What is the importance of the interproximal space?
    • Stimulates peridontium
    • Aids in self-cleaning process
  25. General rules of embrasures
    • Incisal increase posteriorly
    • Gingival decrease posteriorly
    • Anterior labial = lingual in size
    • Posterior buccal < lingual in size
    • Both sides of tooth have symmetrical embrasure contour
  26. Location for facial height of contour
    Cervical 1/3 for ALL teeth
  27. Location for lingual height of contour
    • Anterior - cervical 1/3
    • Posterior - middle/occlusal 1/3
  28. What is is cervical line?
    AKA cemento-enamel junction, where the two meet (a visible line)
  29. Rules for CEJ
    • On facial/lingual - convex towards apical
    • On mesial/distal - convex to incisal
    • Greater curvature on mesial than distal
    • Lines on promixal surfaces equal
    • Curvature decreases posteriorly
  30. What is the gingival line?
    AKA gingival margin/crest; the termination of the soft non-attached tissue to the tooth (highest part of the sulcus)
  31. Characteristics of the gingival line
    • Recedes with age
    • Separates clinical crown/root
  32. What is the epithelial attachment?
    Similar to PDL, but attaches the gingiva to the tooth
  33. What is the periodontal ligament?
    Attaches the bone to the tooth (as opposed to epithelial attachment)
  34. What is a faciolingual taper?
    • A tapering of the mesiodistal width of teeth (starting at the center of the proximal surfaces towards lingual)
    • Mandibular 2nd premolars and maxillary 1st molars may exhibit the reverse of this
  35. General root rules
    • Widest cervically and taper towards apex
    • 1 root - anteriors and premolars (except 1st max)
    • 2 root - 1st max premolar, mand molar
    • 3 root - max molar
  36. What line angles describe labioproximal?
    • Mesiolabial
    • Distolabial
  37. What line angles describe buccoproximal?
    • Mesiobuccal
    • Distobuccal
  38. What line angles describe linguoproximal?
    • Mesiolingual
    • Distolingual
  39. What line angles describe facioproximal?
    • Labioproximal
    • Buccoproximal
  40. What line angles describe axioproximal?
  41. What is the purpose of the Curves of Spee/Wilson?
    It places the forces of mastication along the long axis (vertical)
  42. What determines the curves of Spee/Wilson?
    • Genetic factors
    • Neuromuscular effects of the tongue, lips and cheeks
  43. What portion of the tooth is greatest mesiodistally?
    Buccal 1/2; hence this is where the proximal contacts are
  44. What is the purpose the the faciolingual taper?
    • Allows for teeth to be placed in arch
    • Reduces load on teeth
    • Allows for spillway of food
    • Allows for stimulation of peridontium
  45. Which mandibular posterior has no transverse ridges?
    Mandibular 1st molar
  46. Which tooth is widest mesiodistally?
    Mandibular 1st
  47. Which tooth has 4 cusps of approximately equal size, with the mesiobuccal being the largest?
    Mandibular 2nd
  48. Which cusps are connected by an oblique ridge?
    Mesiolingual and distobuccal
  49. Which teeth display oblique ridges?
    Maxillary molars
  50. Differences between maxillary and mandibular molars?
    • Buccolingual dimensions (mandibular wider BL)
    • Number of roots (maxillary = 3)
    • Oblique ridges (only maxillary)
  51. Occlusal shape of mandibular 1st premolar?
  52. Occlusal shape of mandibular 2nd premolar?
  53. Occlusal shape of maxillary premolars?
    Rectangle (long axis is buccolingually)
  54. Which teeth act as the "cornerstone" of the dentition and what are they numbers?
    • Canines
    • 6, 11, 22, 27
  55. Tooth with the longest crown-root length?
  56. Which tooth may have the Cusp of Carabelli?
    Maxillary 1st molar
  57. On which cusp is the Cusp of Carabelli?
  58. When does the mixed dentition period begin?
    Eruption of 1st permanent mandibular molar; 6 years
  59. When does the mixed dentition period end?
    • Until all deciduous teeth are gone
    • ~12 years
    • Eruption of maxillary canine
  60. What is the first succedaneous tooth to erupt?
    Mandibular central incisors
  61. What constitutes succedaneous?
    • A permanent tooth taking the place of deciduous one
    • Only permanent molars are NOT succedaneous
  62. Hardest tissue in the body?
  63. Tissue that covers the anatomical root?
  64. Forms main body of the tooth
  65. Contains the nerve and blood supply to the tooth
  66. The pulp cavity is lined with what type of cells?
  67. What is the function of odontoblasts?
    Create dentin
  68. What is the alveolar process?
    Bony member surrounding and supporting all teeth
  69. What is an alveolus?
    Socket within the alveolar process that holds a tooth
  70. What is the facial plate of bone covering the root of the canine?
    Canine eminence
  71. What is the last tooth to be lost of periodontal disease?
  72. Maxillary canine crown compared to maxillary central incisor crown
    Length is equal or slightly shorter (incisocervically)