Periodontal Risk Assessment Calculator
Risk level from probing depths, BOP, and risk factors.
Inputs
%
Results
Risk level (1-3)
2
Risk score (0-100)42
Risk points (raw)5
Recall interval (months)4
Prognosis (1-3)2
Intervention urgency (0-100)42
How to Use This Calculator
- Enter the full-mouth BOP percentage and number of sites with probing depth ≥ 5 mm.
- Input the bone loss-to-age ratio (bone loss mm ÷ patient age in decades).
- Enter the number of teeth previously lost to periodontal disease.
- Set systemic risk factors: smoking status and diabetes control level.
- Review the overall Risk Score and Risk Category (Low/Moderate/High/Very High) to guide recall frequency.
What each input means
- BOP percentage (%)
- Full-mouth bleeding on probing percentage.
- Sites with PD >= 5mm
- Number of probing sites >= 5mm.
- Bone loss / age ratio
- Ratio of bone loss (mm) divided by patient age (decades).
- Teeth lost to perio
- Number of teeth previously lost to periodontal disease.
- Systemic factors (0-3)
- 0 = none, 1 = controlled condition, 2 = uncontrolled, 3 = IL-1 positive.
- Smoking status (0-2)
- 0 = never/quit >5yr, 1 = former, 2 = current smoker.
What each result means
- Risk level (1-3)
- 1 = low, 2 = moderate, 3 = high periodontal risk.
- Risk score (0-100)
- Normalized composite risk score.
- Risk points (raw)
- Raw risk point total from Lang & Tonetti criteria.
- Recall interval (months)
- Recommended periodontal maintenance interval.
- Prognosis (1-3)
- 1 = favorable, 2 = guarded, 3 = unfavorable.
- Intervention urgency (0-100)
- Treatment urgency score.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersBOP percentage (%) = 20, Sites with PD >= 5mm = 6, Bone loss / age ratio = 0.5, Teeth lost to perio = 2 = 6 input(s) provided
- Calculate Risk levelRisk level2 = 2
- Calculate Risk scoreRisk score42 = 42
- Calculate Risk pointsRisk points5 = 5
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Periodontics
Perio Maintenance Interval Calculator
Recall frequency from risk assessment and treatment response.
Dental HygienePeriodontal Chart Analyzer
Analyze periodontal pocket depth data to classify disease severity and track trends.
Dental HygieneProphy vs SRP Calculator
Determine whether a patient needs prophylaxis or scaling & root planing based on clinical indicators.
PeriodonticsGuided Tissue Regeneration Calculator
Membrane size from defect anatomy.
PeriodonticsBone Graft Volume (Perio) Calculator
Graft material from defect dimensions.
More in Medical & Clinical.