The world without teeth: demographic trends / Philippe Mojon -- Edentulism, digestion, and nutrition / Josʹe A. Morais and J. Mark Thomason -- The impact of edentulism on function and quality of life / Michael I. MacEntee -- Patient preferences and expectations / Manal A. Awad -- Implant overdentures versus conventional dentures / Jocelyne S. Feine and Guido Heydecke -- Measuring the cost of implant overdenture therapy / John R. Penrod and Yoshiaki Takanashi -- Choosing an implant system for clinical practice: an evidence-based method / Timothy W. Head -- Comparison of treatment strategies for implant overdentures / Daniel Wismeijer and Geert T. Stoker -- Indications and treatment planning for mandibular implant overdentures / Thomas D. Taylor -- Prosthodontic management of maxillary and mandibular overdentures / Regina Mericske-Stern -- The influence of attachment systems on implant-retained mandibular overdentures / Ignace Naert -- Loading strategies for mandibular implant overdentures / Alan G. T. Payne ... [et al.] -- Two-implant overdentures with ball attachments: a step-by-step approach / Pierre Boudrias and Antoine Chehade -- Future directions / Gunnar E. Carlsson.