1. Survey of dental services rendered from 1990;ADA Survey Center,1995
2. Survey of endodontic practice, survey of endodontists, and the endodontic patient encounter forms, March 1999;AAE Survey Center,2000
3. Survey of dental services rendered from 1999;ADA Survey Center,2000
4. Endodontic trends reflect changes in care provided;Dental Products Report,1996
5. Non surgical endodontic retreatment;Ruddle,2002