1. Incidence of rotary ProFile instrument fracture and the potential for bypassing in vivo;Al-Fouzan;International Endodontic Journal,2003
2. American Association of Endodontists Endodontic Difficulty Assessment Form 2006 http://www.aae.org/uploadedFiles/Publications_and_Research/Endodontics_Colleagues_for_Excellence_Newsletter/ss05ecfe.pdf
3. Mechanical root canal preparation with NiTi rotary instruments: rationale, performance and safety. Status report for the American Journal of Dentistry;Bergmans;American Journal of Dentistry,2001