<prompt> According to the International Organization for Standards ISO refinements 3950 to the FDI system, 05 refers to:Upper right sextantUpper left sextantLower right sextantLower left sextant  <response>: International Organization for Standards ISO has added refinements ISO 3950 to the FDI system to designate areas of the oral cavity and to provide sextants as with the CPITN. 00 whole oral cavity 01 maxillary area 02 mandibular area 03 upper right sextant 04 upper anterior sextant 05 upper left sextant 06 lower left sextant 07 lower anterior sextant 08 lower right sextant 09 additional document 