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

Table 1 Criteria for radiographic assessment of anatomical parameters

Diagnostic parameters	Severity criteria
S, size of radiolucent lesion	S0: radiolucency does not exceed 2 times the width of the lateral PL^a
	S1: diameter of well-defined radiolucency up to 3 mm
	S2: diameter of well-defined radiolucency 3–5 mm
	S3: diameter of well-defined radiolucency > 5 mm
R, radiolucent lesion in relation to the dental root	R1: radiolucency appears on one root
	R2: radiolucency appears on more than one root
	R3: radiolucency involves furcation area
D, location of bone destruction	D1: radiolucency around root apex
	D2: radiolucency is in contact with important anatomical structures
	D3: destruction of cortical bone

ISSN: 1472-6831