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Table 2 Treatment outcome definitions based on radiographically estimated transition events between baseline and final PESS scores of the periapical lesion size (S), it's relation with the root (R), and location of bone destruction (D)

From: Prognostic validity of the Periapical and Endodontic Status Scale for the radiographically assessed 2-year treatment outcomes in teeth with apical periodontitis: a prospective clinical study

Diagnostic parameters Positive treatment outcome Negative treatment outcome
Periapical lesion size, (S) S3 → S2; S3 → S1; S3 → S0; S2 → S1; S2 → S0; S1 → S0; S0 → S1; S0 → S2; S0 → S3; S1 → S2; S1 → S3;
S1 → S1; S0 → S0 S2 → S2; S3 → S3
Periapical lesion relation with root, (R) R3 → R2; R3 → R1; R3 → R0; R2 → R1; R2 → R0; R1 → R0; R1 → R1; R0 → R0 R0 → R1; R0 → R2; R0 → R3; R1 → R2; R1 → R3;
R2 → R2; R3 → R3
Periapical lesion location, (D) D3 → D2; D3 → D1; D3 → D0; D2 → D1; D2 → D0; D1 → D0; D1 → D1; D0 → D0 D0 → D1; D0 → D2; D0 → D3; D1 → D2; D1 → D3l;
D2 → D2; D3 → D3