Drawing on experimental studies and clinical cases, Austrian researchers in oral surgery and peridontology review the nature and causes of compromised bone quality, the significance of such compromise for dental implants, and some of the measures currently available for dealing with the problem. Among their topics are factors affecting bone quality, the structure of atrophic alveolar bone, assessing bone quality, surgical perspectives for compromised bone, experimental approaches in bone regeneration, implants in the elderly, implants in children and adolescents, irradiated bone, and lasers in implant dentistry. Most of the illustrations are in color. The material is designed for both practitioners and researchers.