387EDITORIAL: When Human Nature and Science Part Company   William R. Laney, DMD, MS, Editorial Chairman

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389Autogenous Bone Grafting of Bone Defects Adjacent to Implants Placed Into Immediate Extraction Sockets in Patients: A Prospective Study   William Becker, DDS, MSD Burton E. Becker, DDS Giovani Polizzi, DDS, MD Christina Bergstrom

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397Experimental Study of High-Velocity Flame-Sprayed Hydroxyapatite Coated and Noncoated Titanium Implants   Yoshiro Matsui, DDS, PhD Kohsuke Ohno, DDS, PhD Ken-ichi Michi, DDS, PhD Kensuke Yamagata, DDS, PhD

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405Photoelastic Analysis of Stress Distribution Transmitted From a Fixed Prosthesis Attached to Osseointegrated Implants   Gregow A. Waskewicz, DDS John S. Ostrowski, DMD Vincent J. Parks, PhD

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412Touch Sensitivity of Natural Teeth and Endosseous Implants Revealed by Difference Thresholds   Lars Mühlbradt, Dr Stefan Mattes, Dipl Psych Hans Möhlmann, Dr lng Rolf Ulrich, Prof Dr

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417Formation of Dental Hard Tissues and Periodontal Ligament Around Titanium Implants After Tooth-Bud Injury: A Pilot Study   Adriano Piattelli, MD Gian Piero Cordioli, MD Piero Passi, MD Paolo Trisi, DDS,PhD

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422Comparative Surface Analysis and Clinical Performance Studies of Brånemark Implants and Related Clones   Anne Lise Helsingen, DDS Torstein Lyberg, MD, DDS, PhD

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431Ridge Reconstruction After Implant Failure Using a Resorbable Membrane: Report of a Case and Histologic Study   Jean-Noël Godefroy, DDS Norbert Laroche Jean Fourcart Georges Boivin, PhD

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437Collected Implant Cavity Borings Used as Peri-lmplant Osseous Augmentation Material   Günter Lauer, Dr Med, Dr Med Dent Wilfried Schilli, Prof Dr Med

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444Demonstration of Unusually Wide Artery in the Maxillary Alveolar Bone Using a Reformatting Program of Computed Tomography: A Case Report   David Kohavi, DMD

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449Cobalt-Chromium as a Framework Material in Implant-Supported Fixed Prostheses: A 3-year Follow-up   Matti Hulterström, DDS Ulf Nilsson, DDS

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