Periodontal screening: the diagnosis and prognosis app

Periodontal screening is the first clinical act that separates a suspicion from a diagnosis. Yet in everyday practice the recall intervals often stay arbitrary — entrusted to intuition rather than to calculation.

This application solves that. In four steps — patient data, clinical questionnaire, optional radiograph, result — it produces a periodontal diagnosis according to the 2017 classification, computes the individual risk, and returns the optimal recall interval.

What periodontal screening is, and why it matters

Periodontitis affects roughly 50% of the adult population. In its severe form — stage III and IV — it involves more than 11% of adults worldwide, making it the sixth most common chronic condition on the planet (Kassebaum et al., J Dent Res 2014). The problem isn’t prevalence: it’s that most patients reach the diagnosis late, when the damage to the supporting tissues is already advanced.

Screening exists to intercept the disease early. It is not a complicated exam: periodontal probing with a calibrated probe, recording of bleeding on probing (BOP), assessment of clinical attachment loss (CAL) and, when indicated, radiographic analysis. These are gestures that take a few minutes and change the patient’s prognosis. When caught early enough, non-surgical therapy is often enough — which is exactly why the timing of the diagnosis matters.

How the 2017 periodontal classification works

In 2017, the World Workshop on the Classification of Periodontal and Peri-Implant Diseases (Caton et al., J Periodontol 2018) redefined the diagnostic system. The old Armitage classification (1999) — chronic, aggressive, necrotising periodontitis — was replaced by a two-dimensional model: stage and grade.

Stage: severity and complexity

The stage describes how much damage the disease has caused and the complexity of the treatment required.

• Stage I — Initial periodontitis. CAL 1-2 mm, radiographic bone loss in the coronal third of the root, pockets ≤4 mm. No teeth lost to periodontitis.
• Stage II — Moderate periodontitis. CAL 3-4 mm, bone loss in the coronal third, pockets ≤5 mm. Still no teeth lost.
• Stage III — Severe periodontitis. CAL ≥5 mm, bone loss extending to the middle or apical third, pockets ≥6 mm. Up to 4 teeth lost. Vertical defects and class II-III furcation involvement may appear.
• Stage IV — Advanced periodontitis. As stage III, with ≥5 teeth lost to periodontitis and additional complexity factors: bite collapse, pathological migration, masticatory dysfunction.

Grade: risk of progression

The grade estimates how fast the disease progresses and the expected response to treatment.

• Grade A — Slow progression. Percentage bone loss divided by the patient’s age is below 0.25. Non-smoker, non-diabetic.
• Grade B — Moderate progression. Bone loss/age ratio between 0.25 and 1.0. Moderate smoker (fewer than 10 cigarettes/day) or diabetic with HbA1c below 7%.
• Grade C — Rapid progression. Ratio >1.0, or severe modifying factors: heavy smoker (≥10 cigarettes/day), diabetic with HbA1c ≥7%. Bone loss disproportionate to the patient’s age also points toward grade C — the same signature seen in aggressive, early-onset disease.

Risk factors: what shapes the prognosis

A diagnosis is not enough. You need to understand why that patient fell ill and how fast the disease is likely to progress. The main risk factors:

• Smoking: the single most important modifiable risk factor. A smoker has a 2-8 times higher risk of developing periodontitis than a non-smoker (Bergström, J Clin Periodontol 2004). Smoking masks gingival bleeding, making the disease silent.
• Diabetes: uncontrolled diabetes mellitus (HbA1c ≥7%) amplifies the inflammatory response and accelerates periodontal destruction. The relationship is bidirectional: periodontitis worsens glycaemic control.
• Patient compliance: supportive periodontal therapy only works if the patient shows up for recalls. Adherence is a prognostic predictor as powerful as the clinical parameters.
• Stress: chronic stress alters the immune response and is associated with greater prevalence and severity of periodontitis (Genco et al., Ann Periodontol 1998).

What the calculator does

The tool integrates the periodontal classification (stage and grade), clinical parameters (PD, CAL, BOP, mobility), risk factors (smoking, diabetes, compliance) and validated algorithms for the personalised calculation of recall intervals (2-12 months).

If the patient uploads a radiograph, the application uses artificial intelligence to analyse the image — without ever transmitting personal data to the AI service. Name, age and any other metadata stay on the device.

When to perform periodontal screening

The short answer: at every first dental visit, and then at every hygiene recall. The fuller answer: every adult patient should receive at least one full periodontal probing (six points per tooth) per year. In patients with risk factors — smokers, diabetics, those with a family history of periodontitis — screening should be done every 3-6 months.

A periodontal probing takes about 10-15 minutes. It isn’t invasive, it isn’t painful. And yet it is the only way to diagnose a disease that, by definition, doesn’t hurt until it’s too late.

Inspiration

The tool grew out of the experience with Perio-Tools.org, adapted to the needs of our clinical practice and enriched with thousands of treated cases.

Disclaimer

The application does not replace a specialist examination. It is a clinical decision-support tool, to be interpreted within the context of professional judgement.

---

Dr. Ernesto Bruschi