Periodontitis Stage & Grade Example findings loaded

Worksheet for the 2017 AAP/EFP classification. Patient records are kept in an encrypted file on this device; nothing is sent over the internet.

How to use this app

First time in your office

  1. Decide on one folder for all records, such as a folder on the office's shared network drive. Avoid Downloads or the desktop.
  2. One person clicks New records file, picks that folder, and sets the password (at least 10 characters).
  3. Give the password to authorized staff in person. Don't email or text it. If it is forgotten, the records can't be recovered.
  4. Everyone else uses Open records and picks the same folder. Don't create a second records file.

Each day

  1. Click Open records, choose the records folder, and enter the password.
  2. Click New patient, or pick an existing patient from the list and click Open.
  3. Enter the findings. The diagnosis updates as you type.
  4. Click Save patient exam. It saves to the folder automatically.
  5. Click Lock when you step away. Close the browser tab when you're done.

How saving works

  • Every save creates a new file in the records folder named with the date and time, such as perio-records_2026-10-27_093015_a3f2.json. The last four characters keep two computers saving in the same second from overwriting each other.
  • Open records always loads the newest file. Older files are kept as history.
  • When several computers share the folder, each save also picks up exams other computers have saved. Click Check for updates in the patient list to see them without saving.
  • To look at an older save, use Open one file….

Use Chrome or Edge on Windows so the app can save straight to the records folder. Other browsers download each save to the Downloads folder instead, and those copies must be moved to the records folder by hand.

No records file open Create or open a file to save patients
1

Patient

Each save stores one exam. Saving a new exam date for the same patient keeps the earlier one for comparison.

yr
Filled from DOB and exam date
2

Severity

Interdental CAL at the site of greatest loss is the primary measure. Radiographic bone loss (RBL) is used when CAL is not available, and also drives the bone-loss/age ratio for grading.

mm
% root
Worst tooth, as % of root length
teeth
Count only losses due to periodontitis
RBL helper (from radiograph measurements)
mm
mm
—

RBL % = (CEJ–crest − 2 mm) ÷ (CEJ–apex − 2 mm) × 100. The 2 mm allows for normal crest position below the CEJ.

3

Complexity

Complexity factors can raise the stage above what severity alone gives.

mm
teeth

Stage III factors

Stage IV factors

Fewer than 20 teeth present (10 opposing pairs) is counted automatically as a Stage IV factor.

4

Extent

Localized is under 30% of teeth involved; generalized is 30% or more.

teeth
Out of teeth present (section 3)
5

Progression evidence

Direct evidence from prior records takes priority. Without it, the grade comes from bone loss ÷ age at the worst tooth. Case phenotype is the fallback and a cross-check.

Direct evidence (optional)

mm
yr
Scaled to a 5-year rate
6

Grade modifiers

Risk factors can raise the grade regardless of the progression evidence.

%
Used when diabetes is diagnosed
Recorded in the chart note. The 2017 system does not use these to set the grade.
7

Clinician override

If your clinical judgment differs from the worksheet, set the final stage or grade here. A reason is required and goes in the chart note.