Staging & Grading

Interdental CAL of 1-2 mm

Stage 1

Interdental CAL of 3-4

Stage 1

Interdental CAL of ≥ 5 mm

Stage 3 or 4

Radiographic bone loss to the coronal third of root at <15%.

Stage 1

Radiographic bone loss extending to coronal third of root at 15%-33%

Stage 2

Radiographic bone loss extending to middle third of root or beyond. (>33%)

Stage 3 or 4

No tooth loss due to periodontitis.

Stage 1 or 2

4 or fewer teeth lost due to periodontitis.

Stage 2

5 or more teeth lost due to periodontitis.

Stage 4

Max. probing depth 4 mm or less.

Stage 1

Max. probing depth 5 mm or less.

Stage 2

Max. probing depths ≥ 6 mm.

Stage 3 or 4

Mostly horizontal bone loss

Stage 1 or 2

Vertical bone loss of ≥ 3 mm

Stage 3

Class II or III furcation involvement.

Stage 3

Moderate alveolar ridge defects

Stage 3

Potential for additional tooth loss.

Stage 3

Masticatory dysfunction and occlusal trauma (flaring, drifting)

Stage 4

Severe alveolar ridge defects.

Stage 4

Potential for total loss of dentition.

Stage 4

No evidence CAL or radiographic bone loss over past 5 years.

Grade A

Less than 2 mm CAL or radiographic bone loss over past 5

years.

Grade B

2 mm or > CAL or bone loss over the past 5 years.

Grade C

Heavy biofilm deposits but low levels of tissue destruction

Grade A

Tissue destruction in line with expectations given the amount of biofilm deposits present

Grade B

Tissue destruction exceeds expectations given the amount of biofilm deposits present

Grade C

Nonsmoker

Grade A

Smokes <10 cigarettes per day

Grade B

Smokes 10 or > cigarettes per day.

Grade C

No history of diabetes

Grade A

HbA1c <7% in diabetic patients.

Grade B

HbA1c of 7% or > in diabetic patients.

Grade C