Trabalho citado no livro Essential Endodontology, do Professor Orstavik, referência mundial na Endodontia.
https://www.researchgate.net/publication/290974148_The_Impact_of_Apical_Patency_in_the_Success_of_Endodontic_Treatment_of_Necrotic_Teeth_with_Apical_Periodontitis_A_Brief_Review