A dental implant assembly comprising; a first part for fixing a tooth, a second part configured for receiving a threaded fastening means, said fastening means having a head portion and a threaded portion for fastening said first and second parts, a locking mechanism provided with both said first and second parts for locking rotational motion against each other on placing on top of one another, and, characterized in that; said first and second parts and head portion of the fastening means have predetermined profiles such that on screwing said fastening means into said second part a substantial part of the head portion descends into the second part and rests on the profiled sections of first and second parts making a complete contact, thereby, shielding threaded portion of the fastening means from masticating forces.