p b u c v a c From the Department of Endodontics, University of Caliornia at San Francisco, San Francisco, California. Address requests for reprints to Dr. Harold E. Goodis, epartment of Endodontics, University of California at San rancisco, 707 Parnassus Avenue Box 0758, San Francisco, CA 4143. E-mail address: [email protected]. 099-2399/$0 see front matter Copyright © 2006 by the America...