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Anatomy
 

Anatomy

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    Anatomy Anatomy Presentation Transcript

    • Introduction to Dental Anatomy
      Dental Anatomy & Occlusion
      Dent 202
    • Introduction
      Human dentition is diphyodont
      2 sets of dentitions
      Primary/deciduous
      20 teeth in total
      Incisors/canines/molars
      Smaller size
      Secondary/permanent
      32 teeth in total
      Incisors/canines/premolars/molars
      Bigger size
    • Deciduous & permanent dentitions
      Why do we have to have 2 sets of teeth?
    • Why 2 sets of dentitions?
      The jaws have to accommodate the increased number of permanent teeth and their bigger size
    • Dental formula
      I for incisors
      C for Canines
      PM for premolars
      M for molars
      Deciduous teeth are indicated by the letter D before the initial
    • Human dental formula
      Deciduous teeth
      DI 2/2 DC 1/1 DM 2/2 = 10
      Permanent teeth
      I 2/2 C 1/1 PM 2/2 M 3/3 = 16
      The numbers following the letter refer to the number of teeth of each type in the upper then the lower dentition for one side only
    • Quadrants
      Tooth-bearing region of the jaw can be divided into 4 quadrants
      Right maxillary (1 or 5)
      Left maxillary (2 or 6)
      Left mandibular (3 or 7)
      Right mandibular (4 or 8)
      Quadrants in permanent dentition have the numbers 1 - 4 and in deciduous have the numbers 5 - 8
    • Quadrants
      1 or 5
      2 or 6
      4 or 8
      3 or 7
    • Teeth order
      Each tooth in a quadrant takes a letter (A – E for deciduous) or a number (1 – 8 for permanent) indicating its order when counting from the midline
      8 7 6 5 4 3 2 1
      1 2 3 4 5 6 7 8
      E D C B A
      A B C D E
      8 7 6 5 4 3 2 1
      1 2 3 4 5 6 7 8
      E D C B A
      A B C D E
    • Dental nomenclature
      By words
      Set
      Deciduous or permanent
      Jaw
      Maxillary or mandibular
      Class
      Incisor/canine/premolar/molar
      Order within a class
      Central or lateral
      First/second/third
      Side
      Right or left
      By numbers, letters and/or symbols
      Palmer notation system
      Universal numbering system
      FDI numbering system
    • Palmer/Zsigmondy notation system
      1
      E
      American Dental Association in 1947
      Tooth is represented by a number 1 – 8 (permanent) or a letter A – E (deciduous)
      Two lines; indicates which quadrant the tooth belongs to
      a horizontal representing the occlusal plane and
      a vertical representing the midline
      Examples:
      Maxillary right central incisor
      Mandibular left second deciduous molar
      E D C B A
      A B C D E
      8 7 6 5 4 3 2 1
      1 2 3 4 5 6 7 8
      E D C B A
      A B C D E
      8 7 6 5 4 3 2 1
      1 2 3 4 5 6 7 8
    • Universal numbering system
      Palmer – difficulty in keyboard typing
      ADA adopted the universal system in 1968
      Uppercase letters for deciduous teeth
      Consecutive from A to T
      Following a clockwise order from maxillary right second molar to mandibular right second molar
      Numbers for permanent teeth
      Consecutive from 1 to 32
      Following a clockwise order from maxillary right third molar to mandibular right third molar
      A B C D E
      F G H I J
      1 2 3 4 5 6 7 8
      9 10 11 12 13 14 15 16
      T S R Q P
      O N M L K
      32 31 30 29 28 27 26 25
      24 23 22 21 20 19 18 17
    • FDI numbering system
      Proposed by FDI & adopted by WHO
      Each tooth is allocated a two-digit number; the left designates the quadrant and the right designates the tooth order
      Examples
      Mandibular right permanent canine 43
      Maxillary left deciduous lateral incisor 62
      55 54 53 52 51
      61 62 63 64 65
      18 17 16 15 14 13 12 11
      21 22 23 24 25 26 27 28
      85 84 83 82 81
      71 72 73 74 75
      48 47 46 45 44 43 42 41
      31 32 33 34 35 36 37 38