The book is about implant abutment connections,their through time,role they play in securing a prosthesis. It entails the biomechanics related to dental implant therapy and how Implant abutment connection is a crucial synapse between the implant and the abutment. It summarizes the requirements for an optimal implant abutment connection and also discusses how the misfit between abutment and implant interface can lead to many clinical implications as: abutment overload; screw loosening or fracture or even of the implant itself; incorrect transmission etc.