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Hermetic seal of the root canal system is a prime objective of successful endodontic therapy. However, the microleakage between the root canal filling and the cavity walls may adversely affect the success of root canal therapy . The rationale for root end filling is to prevent microleakage. However, none of the materials used provide an impervious seal. Subsequently the microleakage is responsible for the failure of the surgical endodontic procedure. Author Information Taher Al Omari MSc, JB Department of Cariology and EndodonticsDental Surgery, University of Geneva, Geneva, Switzerland. He graduated with a clinical MSc in 2005 and J.B endodontics in 2006 from University of Western Cape, Cape Town, Africa. Yusef Osman BChD, MChD, BBA, MBA, PGDHM completed his dental training at the University of the Western Cape (UWC) in 1978. He was the first recipient of the Gold Medal of the South African Dental Association awarded at UWC. In 2000 he successfully completed the Hospital Leadership programme at the University of Cape Town and in 2001 he was awarded the Honours Bachelors in Business and Administration degree by the University of Stellenbosch. In 2004 he was awarded the Master of Business Administration (MBA) also by the University of Stellenbosch. In 2009 he was awarded the Oliver Tambo Fellowship and also received the Post-graduate diploma in Health Management from the University of Cape Town.His current position is that of Dean/Manager of the Dental Faculty and the Oral Health Centres of the University of the Western Cape in Cape Town.
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