DENTITION WK #2 ANATOMY

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jackiedh
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32835
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DENTITION WK #2 ANATOMY
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2010-09-05 14:21:04
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ANATOMY
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DENTAL ANATOMY
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  1. DENTITION
    general arrangement of the natural teeth in the jawbones
  2. NON-SUCCEDANEOUS DENTITION
    permanent molars that do not replace any teeth (without primary predecessors)
  3. SUCCEDANEOUS DENTITION
    permanent teeth that replace the primary teeth. (everything but the molars)
  4. MIXED DENTITION
    • permanent and primary teeth
    • (i.e. congenitally missing in an adult, no succedaneous tooth to replace a primary tooth)
  5. INCISORS
    biting and cutting
  6. CANINES
    piercing and tearing
  7. PREMOLARS
    • assist canines
    • pierce and tear
    • assist molars with grinding
  8. MOLARS
    grinding food
  9. MAINTAINING TOOTH SHAPE...
    preserves their function
  10. PRIMARY DENTITION
    • 6 mo - 6 yrs
    • begins with eruption of primary mandibular central incisors
    • ends with first permanent tooth eruption
    • jawbones grow to accommodate the teeth
  11. MIXED DENTITION PERIOD
    • 6 - 12 years
    • transitional stage - most growth for jawbones (expander sometimes necessary)
    • begins: eruption of first permanent tooth
    • ends: exfoliation of last primary tooth
    • color: whiter due to less dentin in primary teeth
    • females mature sooner and shed sooner
  12. MIXED DENTITION CONSIDERATIONS
    • ugly duckling
    • different colors of teeth (prim and perm)
    • disproportionately sized
    • temporary edentulous and crowding
    • gingival inflammation = crowding = more biofilm and plaque
    • oral hygiene = poor, due to biofilm retention and education
    • juvenile periodontitis = bone loss in a child, hereditary, inflamed gums (perm 1st molars and lower ant teeth)
  13. PERMANENT DENTITION
    • occurs approximately age 12, last tooth usually shed
    • begins with exfoliation of last primary tooth
    • tooth types erupt in pairs. if one of the pairs is missing, find out where it is
    • family history, different eruption times, excess teeth
    • eruption of all permanent teeth = congenitally missing (not usually in pairs), impacted teeth = third molars, canines with crowding that won't erupt. (take pano)
  14. DIVISIONS OF THE DENTITION
    • arches = max and man
    • quads = quad I quad II quad III and quad IV
  15. NAMING AND CODING TEETH
    • universal system
    • palmer method
    • FDI = federation dentitaire internationale system
  16. UNIVERSAL SYSTEM
    • observed as though facing the patients quadrants
    • most common in the U.S.
    • primary teeth A-J and K-T
    • permanent teeth 1-16 and 17-32
  17. PALMER METHOD
    • uses quadrant brackets to identify the teeth (ortho)
    • permanent teeth 1-8 in each quadrant from midline distally
    • 87654321 12345678
    • 87654321 12345678
    • primary teeth A-E from the midline distally
    • EDCBA ABCDE
    • EDCBA ABCDE
  18. FEDERATION DENTITAIRE INTERNATIONALE SYSTEM (FDI)
    • ISO = international standards organization system by world health organization
    • FDI = 2 digit code for primary and permanent dentition
    • 1st digit indicates quadrant
    • 2nd digit indicates the tooth in the quadrant
    • permanent = 1-8 from the midline distally with quadrants 1-4
    • primary = 1-5 from the midline distally with quadrants 5-8
  19. ALVEOLAR PROCESS
    the jawbone that contains the teeth
  20. SEXTANTS
    • 6 sections instead of 4 quadrants.
    • canine to canine = 1 sextant
    • premolars to molars = 1 sextant etc.
    • not an equal # in each sextants, but six sections
  21. PULP HORNS
    # is associated with the # of cusps of the tooth
  22. APICAL FORAMINA
    openings of the apex where the nerve and bv's pass
  23. CEJ
    • cementum of the root and enamel of the crown
    • cementum overlaps enamel
    • edge to edge
    • small area of exposed dentin can occur
  24. ANATOMICAL CROWN
    • portion of the crown covered by enamel
    • constant over life of tooth
    • exception: attrition (teeth are worn down) physical wear
  25. CLINICAL CROWN
    • portion that you can see
    • if there is root exposure, it is part of the clinical crown
  26. ANATOMICAL ROOT
    • portion of the anatomical root that is visible
    • varies over time with age
    • related to gingival recession
  27. CLINICAL ROOT
    • widest at the CEJ
    • tapered towards the apex
    • bulkier on facial
    • taper on lingual
    • root concavities ***(important to clean concavity out)
  28. ROOT AXIS LINE
    • imaginary line that runs parallel to the axis of the tooth
    • helps determine angulation during instrumentation
  29. INTERPROXIMAL SPACE
    area between the adjacent tooth surfaces
  30. CONTACT
    proximal area where the teeth touch (floss)
  31. HEIGHT OF CONTOUR
    • facial and lingual
    • easy to see, where the tooth sticks out the most
  32. PROXIMAL CEJ CURVATURE
    • greatest on anterior teeth, least on posterior
    • greater on mesial
    • helps distinguish left from right on extracted teeth/typodont teeth
  33. EMBRASURE
    triangle tissue that may or may not be open
  34. LINE ANGLES
    • formed by the junction of 2 crown surfaces
    • i.e. mesial and occlusal = mesio-occlusal
  35. POINT ANGLES
    • formed by the junction of three crown surfaces
    • i.e. mesial, labial, incisal = mesiolabioincisal
  36. CROWN THIRDS
    • cervical: next to gums
    • middle
    • incisal/occlusal = horizontally, vertically = mesial, middle, distal
  37. ROOT THIRDS
    • horizontally ONLY
    • cervical third
    • middle third
    • apical third

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