Table 2 Registration of periodontitis in SCOR, 1972–2022 using Fédération Dentaire Internationale (FDI) notation

NA

Either no pathological pockets or no registration.

Blank

Pockets < 4mm.

1

Clinical attachment loss at minimum one site upon probing along the cervical line (Periodontitis marginalis).

X

Is registered if the junctional epithelium for one or more teeth is located apically to the cemento-enamel junction.

4

Pockets > 4mm.

X

Missing registration tooth (lost or not yet erupted).

5

Pockets > 4mm with attachment loss and the bottom of the pocket lying apically to the cemento-enamel junction.

X

Missing registration tooth.

Non-mandatory registration.

Mandatory registration from age 14.

Mandatory registration for ages 12 and 15.

Registered on 4 index teeth (tooth 52 and 55, and 82 and 85 in the temporary dentition, and 12 and 16, and 42 and 46 in the permanent dentition). If a registration tooth is missing the nearest neighboring tooth is used.

Registered on 12 index teeth (teeth 11, 12, 21, 22, 31, 32, 41, 42 and 16, 26, 36, 46). Calculated as index.

Registered on 12 index teeth (teeth 11, 12, 21, 22, 31, 32, 41, 42 and 16, 26, 36, 46). Calculated as index.