Managing Periodontal Assessments

Managing Periodontal Assessments

Structures periodontal evaluation with probing depths, clinical attachment levels, bleeding indices, and disease classification per the AAP/EFP 2018 Classification of Periodontal and Peri-Implant Diseases and Conditions.

Why This Skill Exists

Periodontal disease affects nearly half of US adults over 30 (CDC/NHANES data), yet it remains the most under-diagnosed and under-documented dental condition. Inconsistent probing technique, failure to calculate clinical attachment levels, and use of deprecated classification terminology ("chronic periodontitis," "aggressive periodontitis") create treatment planning errors, insurance claim denials, and missed opportunities for early intervention. This skill enforces the current AAP/EFP staging and grading system with standardized data collection so that every periodontal assessment produces a defensible diagnosis, a clear risk profile, and a treatment rationale that satisfies both clinical and payer requirements.

Checkpoint A — Pre-Assessment Verification

Required Inputs

• Complete medical history with focus on diabetes status (HbA1c), smoking history (pack-years), immunosuppressive conditions, and medications affecting gingival health (calcium channel blockers, phenytoin, cyclosporine)
• Current full-mouth radiographic series (FMX or panoramic + bitewings) for bone level assessment
• Prior periodontal charting for comparison (when available)
• Patient chief complaint and symptom history (bleeding gums, loose teeth, bad taste, gum recession)
• Calibrated periodontal probe (UNC-15 or Williams probe)

Intake Questions

1. Does the patient report bleeding when brushing or flossing?
2. Has the patient noticed any teeth becoming loose or shifting position?
3. What is the patient's diabetes status and most recent HbA1c (if diabetic)?
4. What is the patient's smoking history (current, former, never; pack-years)?
5. Is the patient taking medications known to cause gingival overgrowth (nifedipine, amlodipine, phenytoin, cyclosporine)?
6. Has the patient received prior periodontal treatment (SRP, surgery, maintenance), and when was the last treatment?
7. Is there a family history of early tooth loss or periodontal disease?

Step 1 — Full-Mouth Periodontal Probing

Record six-point measurements on every tooth present.

• Probing sites: Mesiobuccal, mid-buccal, distobuccal, mesiolingual, mid-lingual, distolingual for each tooth
• Probing technique: Insert probe parallel to long axis of tooth with 20–25 grams of force (enough to blanch tissue, not enough to penetrate epithelium); walk the probe around the tooth
• Recording: Document measurements in millimeters to the nearest whole number; record deepest reading per site
• Bleeding on probing (BOP): Record as present (+) or absent (−) at each probing site within 15 seconds of probing; calculate percentage of sites with BOP — if > 10%, indicates active periodontal inflammation per AAP/EFP consensus
• Suppuration: Record any sites with purulent exudate on probing; these indicate active infection

Step 2 — Clinical Attachment Level Calculation

Determine the true extent of periodontal destruction by measuring from the CEJ.

• CAL formula: Probing depth + recession = CAL (when recession is present); Probing depth − distance from gingival margin above CEJ = CAL (when hyperplasia is present)
• Recession measurement: From CEJ to free gingival margin in mm; use Miller Classification (I–IV) or Cairo RT1/RT2/RT3 for gingival recession phenotype
• Maximum CAL: Identify the site with the greatest attachment loss; this drives staging
• Interdental CAL: Measure at the most coronal position of the interdental contact or at the tooth surface in the interproximal area — this is the primary measure for staging per 2018 classification

Step 3 — Radiographic Bone Loss Assessment

Correlate clinical findings with radiographic bone levels.

• Crestal bone level: Measure distance from CEJ to crestal bone; normal is 1.5–2.0 mm; bone loss = distance beyond this threshold
• Pattern classification: Horizontal (generalized even reduction across quadrants/sextants) vs. vertical/angular (localized defects with different depths on mesial and distal of same tooth)
• Bone loss percentage: Calculate as percentage of root length (coronal third = mild, middle third = moderate, apical third = severe)
• Furcation involvement: Assess radiographically and clinically using Glickman classification — Grade I (incipient), Grade II (cul-de-sac), Grade III (through-and-through), Grade IV (through-and-through with recession exposing furcation)
• Tooth-to-bone ratio: Estimate crown-to-root ratio for prognosis assessment

Step 4 — AAP/EFP 2018 Staging

Assign periodontal staging based on severity and complexity.

• Stage I (Initial): CAL 1–2 mm interdentally; radiographic bone loss in coronal third (< 15%); maximum probing depths ≤ 4 mm; no tooth loss due to periodontitis
• Stage II (Moderate): CAL 3–4 mm interdentally; radiographic bone loss in coronal third (15–33%); maximum probing depths ≤ 5 mm; no tooth loss due to periodontitis
• Stage III (Severe): CAL ≥ 5 mm interdentally; radiographic bone loss extending to middle or apical third; probing depths ≥ 6 mm; tooth loss ≤ 4 teeth due to periodontitis; vertical bone defects ≥ 3 mm, Class II/III furcation, moderate ridge defects
• Stage IV (Advanced): Stage III criteria plus: tooth loss ≥ 5 teeth due to periodontitis; masticatory dysfunction, secondary occlusal trauma, severe ridge defect, bite collapse, drifting, flaring, < 20 remaining teeth
• Extent descriptor: Localized (< 30% of teeth affected), generalized (≥ 30%), or molar-incisor pattern

Step 5 — AAP/EFP 2018 Grading

Assign periodontal grading based on rate of progression and risk factors.

• Grade A (Slow): No evidence of progression over 5 years by radiographic comparison; % bone loss/age < 0.25; heavy biofilm deposits with low levels of destruction; non-smoker; normoglycemic (HbA1c < 7%)
• Grade B (Moderate): Bone loss commensurate with biofilm deposits; % bone loss/age = 0.25–1.0; this is the default grade when longitudinal data is absent
• Grade C (Rapid): Destruction exceeds expectations for biofilm deposits; % bone loss/age > 1.0; specific pattern of destruction (molar-incisor in young patient); current smoker (≥ 10 cigarettes/day); HbA1c ≥ 7% in diabetic patients
• Risk factor modification: Smoking and diabetes are the primary grade modifiers; document smoking status and HbA1c with source date; a Grade B case is shifted to Grade C if the patient is a current heavy smoker or has uncontrolled diabetes

Step 6 — Peri-Implant Assessment (When Applicable)

Apply parallel classification for peri-implant conditions.

• Peri-implant mucositis: BOP and/or suppuration at probing, no bone loss beyond initial remodeling (typically 1–2 mm from implant platform in the first year)
• Peri-implantitis: BOP and/or suppuration, progressive bone loss beyond initial remodeling; classify severity using the same staging framework adapted for implants
• Probing technique: Probe around implants with plastic or titanium-tipped probe (not steel); 0.25 N force; record four to six sites per implant
• Radiographic baseline: Compare current bone levels to the 1-year post-loading baseline radiograph

Checkpoint B — Assessment Completeness Review

• Six-point probing completed on all teeth with values recorded in mm
• BOP recorded at every site with percentage calculated
• CAL calculated for key sites (at minimum, worst site per sextant)
• Recession documented at all sites with recession present
• Furcation assessment completed for all molars
• Radiographic bone loss assessed and correlated with probing depths
• AAP/EFP Stage (I–IV) assigned with extent descriptor (localized/generalized/molar-incisor)
• AAP/EFP Grade (A–C) assigned with risk factor documentation
• Peri-implant assessment completed for all implants present
• Prior periodontal data compared (or noted as unavailable)

Quality Audit

Guidelines

• Use the AAP/EFP 2018 Classification exclusively; do not use deprecated terms ("chronic periodontitis," "aggressive periodontitis," "refractory periodontitis")
• BOP threshold of 10% distinguishes clinical health from gingivitis per the 2017 World Workshop consensus
• Grade B is the default when longitudinal radiographic data is not available for progression assessment; document the basis for grade assignment
• Always calculate % bone loss/age ratio when longitudinal data exists — this is the primary direct evidence for grading
• Smoking and diabetes are the only validated grade-modifying risk factors in the current classification; do not upgrade grade based on other factors without documentation of rapid progression
• Furcation involvement automatically elevates staging complexity (Class II or III furcation = at least Stage III)
• Document tooth-specific prognosis for teeth with advanced attachment loss using standardized terms (good, fair, poor, questionable, hopeless)
• For peri-implant assessment, use the 1-year post-loading radiograph as baseline, not the date of placement
• Periodontal assessment must be repeated at every periodontal maintenance visit (D4910) with comparison to prior charting
• Flag sites with probing depths ≥ 5 mm that have not responded to Phase I therapy with [NON-RESPONSIVE SITE] for surgical re-evaluation