Periodontal Chart Analyzer

This calculator splits Total Sites Measured into four buckets -- healthy, mild, moderate, and severe -- built entirely from Sites ≥4mm and Sites ≥6mm relative to Total Sites, since sites at 6mm or deeper are clinically a subset of sites at 4mm or deeper. Sites ≥6mm is treated as capped at Sites ≥4mm for this split, so entering a Sites ≥6mm count higher than Sites ≥4mm doesn't produce a nonsensical result; raising Sites ≥6mm always raises or holds steady Severe Sites %, never lowers it. Within Sites ≥6mm, this calculator further splits Moderate Sites % and Severe Sites % using an undisclosed-until-now 60/40 ratio -- there's no separate real input distinguishing, say, a 6-7mm site from an 8mm+ site, so that split is this calculator's own illustrative heuristic, not a measured value; treat the moderate/severe boundary as approximate. Classification is driven by how widespread deep (≥6mm) pocketing is -- the percentage of all sites at 6mm or deeper -- rather than by Average Pocket Depth, because real periodontal staging (2017/2018 AAP/EFP World Workshop) keys off interdental clinical attachment loss or radiographic bone loss extent, not the average probing depth across all sites.

This calculator doesn't collect attachment loss or radiographic bone loss directly, so it uses the extent of 6mm+ pocketing as the closest available stand-in: no 6mm+ sites and no 4mm+ sites reads "Healthy Periodontium"; some 4mm+ sites but no 6mm+ sites reads "Gingivitis / Stage I"; and once 6mm+ sites are present, how large a share of all sites they make up separates Stage II (under 15%), Stage III (15-32%), and Stage IV (33% or more) -- the same real Stage I/II/III boundary percentages used elsewhere in this calculator's own catalog. Average Pocket Depth itself plays no role in either the four-bucket percentage split or Classification; it's shown only as an informational readout of what was entered. Bleeding on Probing % is simply Bleeding Sites divided by Total Sites Measured, with a standard interpretive band attached (Ainamo & Bay): under 10% reads Health, 10-30% reads Localized Gingivitis, and over 30% reads Generalized Gingivitis. Those "Stage" labels borrow terminology from periodontal-staging concepts as a simplified aid, not the full multi-factor 2018 AAP/EFP classification, which also weighs clinical attachment loss, radiographic bone loss pattern, and tooth loss.