Joseph J. Massad & David R. Cagna 
Application of the Neutral Zone in Prosthodontics [PDF ebook] 

The authors
Joseph J. Massad, DDS, is Associate Professor in the Department of Prosthodontics at the University of Tennessee Health Center, School of Dentistry in Memphis, Tennessee, USA; Adjunct Associate Professor in the Department of Prosthodontics and Operative Dentistry at Tufts University School of Dental Medicine in Boston, Massachusetts, USA; Adjunct Associate Professor in the Department of Comprehensive Dentistry at the University of Texas Health Science Center, School of Dentistry in San Antonio, Texas, USA; Adjunct Associate Professor in the Department of Restorative Dentistry at Loma Linda University School of Dentistry, in Loma Linda, California, USA; Clinical Assistant Professor at the University of Oklahoma College of Dentistry in Oklahoma City, Oklahoma, USA; and Private Practice in Tulsa, Oklahoma, USA.
David R. Cagna, DMD, MS, is a Professor in the Department of Prosthodontics, Associate Dean of Postgraduate Affairs & Director of Advanced Prosthodontics at the University of Tennessee Health Science Center, College of Dentistry, Memphis, Tennessee, USA; Diplomate & Director of the American Board of Prosthodontics; and Fellow of the American College of Prosthodontists.
Charles J. Goodacre, DDS, MSD, is Distinguished Professor in the Department of Restorative Dentistry at Loma Linda University School of Dentistry in Loma Linda, California, USA; and Diplomate and Past-President of the American Board of Prosthodontics.
Russell A. Wicks, DDS, MS, is Professor and Chairman in the Department of Prosthodontics at the University of Tennessee Health Science Center, College of Dentistry in Memphis, Tennessee, USA.
Swati A. Ahuja, BDS, MDS, is Adjunct Assistant Professor in the Department of Prosthodontics at the University of Tennessee Health Science Center, College of Dentistry in Memphis, Tennessee, USA; and Prosthodontic Consultant at Lutheran Medical Center in New York City, New York, USA.