By Ana Arias, DDS, PhD, Rupinderpal Singh, DDS, and Ove A. Peters, DMD, MS, PhD

From the Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, California.
Address requests for reprints to Dr Ana Arias, University of the Pacific, Arthur A. Dugoni School of Dentistry, 2155Webster Street, San Francisco, CA 94115. E-mail address:

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