BDP: Notation systems

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Last updated 9:50 AM on 9/16/26
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6 Terms

1
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Humans are diphyodont and heterodont

  • Human har diphyodont: we develop two sets of teeth:

    • first the decidous (primary/milk) teeth

    • followed by the permanent (secondary) teeth.

  • Humans are heterodont: we have different types of teeth with different shapes and functions.


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Human detention division

  • Wr use the patient´s right and left sides.

  • The dentition is divided into 4 quadrants: upper right, upper left, lower right and lower left:

    • Permanent detention: 8 teeth per quadrant (2-1-2-3 = 32 teeth)

      • I: 2 Incisors (I1, I2)

      • C: 1 Canine (C)

      • P: 2 Premolars (P1, P2)

      • M: 3 Molars (M1, M2, M3)

    • Deciduos detention: 5 teeth per quadrant (2-1-2 = 20 teeth)

      • I: 2 Incisors (I1, I2)

      • C: 1 Canine (C)

      • M: 2 Molars

    • There are no premolars in the deciduous dentention!


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Tooth numbering systems: Zsigmondy-Palmer (military) system

  • Each quadrant is represented by an L-shaped symbol, and the teeth are numbered from the midline backwards


  • Permanent teeth: 1-8 in each quadrant

    • Represented in latin numbers or dark colors

  • Decidous teeth: 1-5 in each quadrant

    • Represented in roman numbers, alphabet or red color


The number identifies the tooth, while the L-shaped symbol identifies the quadrant

<ul><li><p>Each quadrant is represented by an <strong>L-shaped symbol</strong>, and the teeth are numbered from the midline backwards</p></li></ul><p></p><ul><li><p><strong>Permanent teeth</strong>: 1-8 in each quadrant </p><ul><li><p>Represented in latin numbers or dark colors </p></li></ul></li><li><p><strong>Decidous teeth</strong>: 1-5 in each quadrant </p><ul><li><p>Represented in roman numbers, alphabet or red color </p></li></ul></li></ul><p></p><p>The <strong>number identifies the tooth</strong>, while the<strong> L-shaped symbol identifies the quadrant</strong></p>
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Tooth numbering systems: FDI system

  • The FDI (Fédération Dentaire Internationale) system is a widely used two-digit system:

    • First digit: quadrant

    • Second digit: tooth position within that quadrant, counted from the midline backwards

  • For example: 1,13 = upper right canine


<ul><li><p>The FDI (Fédération Dentaire Internationale) system is a widely used <strong>two-digit system</strong>: </p><ul><li><p><strong>First digit</strong>: <strong>quadrant</strong> </p></li><li><p><strong>Second digit</strong>: <strong>tooth position within that quadrant</strong>, counted from the midline backwards</p></li></ul></li><li><p>For example: 1,13 = upper right canine </p></li></ul><p></p>
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Tooth numbering systems: American/Universl system

  • Instead of numbering each quadrant separately, this system counts continuously around the mouth

    • Permanent teeth: numbered 1-32, starting at the upper right third molar, continuing across the upper jaw and them around the lower jaw to the lower right third molar

    • Deciduous teeth: use capital letters A-T, following the same pattern.


<ul><li><p>Instead of numbering each quadrant separately, this system <strong>counts continuously around the mouth</strong></p><ul><li><p><strong>Permanent teeth</strong>: numbered <strong><u>1-32</u></strong>, starting at the upper right third molar, continuing across the upper jaw and them around the lower jaw to the lower right third molar </p></li><li><p><strong>Deciduous teeth</strong>: use capital letters <strong><u>A-T,</u></strong> following the same pattern. </p></li></ul></li></ul><p></p>
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Tooth numbering systems: Comparison

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