The terminal hinge axis has always been a subject of controversy with some doubting its existence itself, some claiming the existence of multiple hinge axes, while still others saying that its accurate location is nothing more than waste of clinical time as an arbitrary location serves the purpose equally well.Despite this, the location of hinge axis has evolved as an important clinical step in rehabilitating partially or completely edentulous patients, thus helping the prosthodontist achieve a high degree of precision in restorations and thus clinical excellence. This book is entitled to provide a clearer insight for better understanding by the readers.