Tested on Gulf Medical Boards (DHA, SMLE, MOH & HAAD)
Clinical calculations and diagnostic scoring systems like Periodontal Risk Assessment (PRA Hexagonal Model) frequently appear on Prometric exams. Master high-yield clinical vignettes with instant AI-powered pathophysiology rationales.
What is the Periodontal Risk Assessment (PRA Hexagonal Model)?
The Periodontal Risk Assessment (PRA Hexagonal Model) is an evidence-based clinical decision rule engineered to quantify diagnostic probability, stratify clinical severity, and guide therapeutic decision-making in dentistry practice. The Periodontal Risk Assessment (PRA) model by Lang and Tonetti evaluates 6 key clinical and environmental parameters (BOP %, deep pockets ≥5mm, tooth loss, bone loss/age ratio, systemic diabetes, and smoking status) to determine periodontal stability and supportive maintenance therapy intervals. Clinical scoring tools like Periodontal Risk Assessment (PRA Hexagonal Model) are essential in acute and outpatient management, enabling clinicians to objectively differentiate between low-risk candidates suitable for conservative therapy and high-risk patients requiring urgent interventions. Verified against current 2026 clinical standards, this tool is extensively tested on Gulf health authority licensing exams including DHA (Dubai), SMLE (Saudi Arabia), MOH, HAAD/DOH (Abu Dhabi), OMSB (Oman), and QCHP (Qatar).
💡Clinical Pearls & Diagnostic Utility
Empirically proven to predict long-term tooth loss and guide customized periodontal maintenance visit intervals.
Formula & Calculation Parameters
The mathematical equation and clinical variables required to calculate Periodontal Risk Assessment (PRA Hexagonal Model):
Score Interpretation & Clinical Stratification
| Score Range | Clinical Interpretation | Risk Tier |
|---|---|---|
| ≤ 1 | Low Periodontal Risk (Recall every 6 - 12 months) | green |
| 2 – 3 | Moderate Periodontal Risk (Recall every 6 months) | yellow |
| ≥ 4 | High Periodontal Risk (Recall every 3 - 4 months) | red |
When to Exercise Caution
Assumes patient compliance with oral hygiene instruction; does not replace surgical re-evaluation when indicated.
Clinical Review Board
Dr. Muhammad Nouman, MBBS
Capital Medical University | PMDC Reg No: 117744-P
Clinical Audit Status
✓ Verified for 2026 Guidelines
Last updated: 2026-08-08
Peer-Reviewed Medical Literature
- •Lang NP, Tonetti MS. Periodontal risk assessment (PRA) for patients in supportive periodontal therapy (SPT). Oral Health Prev Dent. 2003;1(1):7-16.
- •Tonetti MS, et al. Staging and grading of periodontitis: Framework and proposal of a new classification and case definition. J Periodontol. 2018;89 Suppl 1:S159-S172.
Related Dentistry Calculators & Scoring Tools
Explore related clinical calculators, risk stratification indexes, and diagnostic scoring algorithms in Dentistry:
BMI Calculator
Calculate Body Mass Index based on height and weight.
Body Surface Area (BSA)
Calculate BSA using the Mosteller formula.
Ideal Body Weight (IBW)
Calculate ideal body weight using the Devine formula.
Mean Arterial Pressure (MAP)
Calculate MAP based on Systolic and Diastolic Blood Pressure.
CURB-65 Score for Pneumonia
Estimates mortality of community-acquired pneumonia to help determine inpatient vs. outpatient treatment.
eGFR (CKD-EPI 2021)
Estimates glomerular filtration rate using the 2021 race-free equation.