The implants and abutment assemblies are configured to tighten the connecting screws inside the abutments to bring the implants and abutments into close contact with each other. In addition to the complex structure of the standard bolt nuts (implants inserted into the pubic bone serve as nuts, The material to be fixed by the abutment and the connection screw of about 2 mm in diameter inside the abutment serves as a bolt), so that the anti-lock washer can not be inserted into the implant serving as the nut. The structure is different in that the bolt (connecting screw) is loosened rather than the method of loosening the fused nut (implant) inserted into the alveolar bone. The implant and abutment connection thread is made by 1) making an insertion guide groove in the head of the connecting screw in the abutment, 2) inserting the rotation protrusion of the anti-lock washer into the head insertion groove of the connecting screw, 3) Anti-reverse ratchet type ratchet jaws in the form of counter bores are formed inside the abutment which is contacted with the anti-lock washer (RATCHAT ratchet type gear) fitted on the head, and 4) Loosening of the implant and abutment preventing reverse rotation of the connecting screw Method. The crown and abutment connecting screw parts are also formed in the same manner as described in 1) forming the insertion guide groove in the head part of the connecting screw in the crown, 2) inserting the rotating projection of the unlocking washer into the connecting screw head insertion guide groove, 3) Counterbore-shaped anti-reverse ratchet gear engagement jaws are formed inside the crown in contact with the anti-lock washer (RATCHAT ratchet gear) fitted to the crown, and 4) crown and abutment (or implant) . If the connecting screw of the implant and abutment section and the connecting thread of the crown and abutment section are loosened by the present invention, more time, expense and effort should be put into re-operation. However, It has th
