Board-Certified Periodontist & Dental Implant Surgeon — Michigan
Pick one option per factor. Points are the exact weights from the PRS card; the score updates as you go.
Non-diabetic patients score 0. Use the most recent value.
Miller mobility class.
Deepest site on the tooth, in mm.
Glickman class. Single-rooted teeth score 0.
PERIODONTAL RISK SCORE
0 of 7 factors scored
HOW THE SCORE MAPS TO PROGNOSIS
| Total score | Class | 5–10 yr survival | 15–20 yr survival |
|---|---|---|---|
| 1 – 4 | 1 · EXCELLENT | 98% | 96% |
| 5 – 7 | 2 · GOOD | 95% | 90% |
| 8 – 11+ | 3 · GUARDED | 89% | 67% |
In the validation cohort, a Class 2 tooth carried roughly 3.7× the hazard of periodontal tooth loss of a Class 1 tooth, and a Class 3 tooth roughly 11× (multivariate model adjusted for age, sex and maintenance; Harrell C-index 0.947). Scores above 11 are possible on the card but were rare in the study population; they fall in the Guarded class.
| Factor | 0 points | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
| Age | 1–39 | ≥ 40 | — | — | — |
| Smoking | Never; or former, quit ≥ 15 yr | — | Light (≤ 10/day); or former, quit ≤ 15 yr | — | Heavy (≥ 10/day) |
| HbA1c | < 6.0 | 6.1 – 7.0 | 7.1 – 8.0 | 8.1 – 9.0 | > 9.1 |
| Tooth type | Non-molar; mandibular molar | Maxillary 1st molar | Maxillary 2nd molar | — | — |
| Mobility | None | Class 1 | Class 2 | Class 3 | — |
| Probing depth | < 5 mm | 5 – 7 mm | 8 – 10 mm | > 10 mm | — |
| Furcation | None | Class 1 | Class 2 | Class 3 / through-and-through | — |
SOURCE
Saleh MHA, Tattan M, Troiano G, Dukka H, Ravidà A, Levine R, Wang H-L, Miller PD. Periodontal risk score: Initiation and model validation for 6,762 teeth. J Periodontol. 2023;94(4):459–466. doi:10.1002/JPER.22-0273 ↗
The PRS is a modification of the Miller–McEntire Periodontal Prognostic Index. Open access (CC BY-NC-ND). This calculator reproduces the published card; it is provided for clinician education and does not constitute treatment advice.
Bring it to the next Implant Study Club session — case-based, over dinner, free CE.
