Improper Occlusal Scheme
This is an important cause of failure as the implant are more sensitive to occlusal trauma and leads to prosthetic failure and bone loss. The susceptibility of implant lies in the difference in stress distribution and propriception between implant and teeth. The choice of occlusal material (Acrylic,metal or ceramic), biomechanics of the prosthesis, vertical dimension, centric occlusion, lateral excursive contacts, absence of interferences are very important factors which need to be considered during planning and treatment execution.