Table 1.

Endo−perio lesion (EPL) according to Herrera et al. [2].

Endo−periodontal lesion with root damage	Root fracture or cracking
	Root canal or pulp chamber perforation
	External root resorption
Endo−periodontal lesion without root damage	Endo−periodontal lesion in periodontitis patients	Grade 1—narrow deep periodontal pocket in 1 tooth surface
		Grade 2—wide deep periodontal pocket in 1 tooth surface
		Grade 3—deep periodontal pockets in more than 1 tooth surface
	Endo−periodontal lesion in non-periodontitis patients	Grade 1—narrow deep periodontal pocket in 1 tooth surface
		Grade 2—wide deep periodontal pocket in 1 tooth surface
		Grade 3—deep periodontal pockets in more than 1 tooth surface