Abhishek  Parolia, M.  Kundabala, 
    Non-Surgical Re-Treatment of Failed Surgical Endodontic Therapy Using Propolis as an Intra-Canal Medicament: A Case Report,
    Research Journal of Medical Sciences,
    Volume 4,Issue 4,
    2010,
    Pages 292-297,
    ISSN 1815-9346,
    rjmsci.2010.292.297,
    (https://makhillpublications.co/view-article.php?doi=rjmsci.2010.292.297)
    Abstract: This study describes a case of successful nonsugical endodontic retreatment of upper left central and lateral incisors with large apical radiolucency lesion which had previously undergone endodontic therapy with surgical intervention. The teeth were treated endodontically for 2 years with an interim filling of propolis mixed with propylene glycol. After 2 years, the postoperative intraoral periapical radiograph showed good periapical healing with complete resolution of periapical radiolucency. A thorough clinical evaluation, proper diagnosis and careful nonsurgical retreatment can often bring healing even in previous endodontic and surgically failed cases.
    Keywords: Propolis;propylene glycol;nonsurgical retreatment;endodontic failure;surgical failure;diagnosis