Define type of root canal perforations according to location, Biology

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Define Types of Root Canal Perforations According to location

According to location (level) in relation to crestal bone):

Coronal perforation: (supragingival) coronal to the level of crestal bone and epithelial attachment with minimal damage to the supporting tissue and easy access, good prognosis.
Crestal perforation: (subgingival) at the level of epithelial attachment into the crestal bone, questionable prognosis.
Mid root: striping perforation. Apical perforation: apical to the crestal bone and the epithelial attachment good prognosis.

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