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Paul Kim

FDI/ISO System (permanent teeth) (Latin)

FDI/ISO System (permanent teeth) (Latin)

The arcus maxillaris et mandibularis are separated in the midline into quadrants (2 maxillary and 2 mandibular quadrants). The FDI (Fédération Dentaire Internationale) or ISO (International Organization for Standardization) system is the most commonly employed means of tooth notation across the world. It uses a number combination where the first number corresponds to the quadrant in which the tooth is located (upper right quadrant = 1, upper left quadrant = 2, lower left quadrant = 3, lower right quadrant = 4) while the second number (1-8) corresponds to the tooth position working mesial to distal. For example, the dens molaris primus dexter maxillaris receives the number ‘16’, since it’s located in quadrant 1 and is the 6th tooth working mesial to distal.
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