The present invention relates to a coupling structure of an abutment and a crown for an implant, in which the abutment is screwed to an upper portion of a fixture fixed to an alveolar bone, and a lower portion of the crown is coupled to an upper portion of the abutment. An insertion part is formed at an upper portion of the abutment, the crown is provided thereinside with an insertion groove into which the insertion part is inserted, and a connection part, having the outer periphery and the upper surface coupled to the inner periphery and the bottom surface of the insertion groove between the abutment and the crown, has an accommodation portion having a shape corresponding to the shape of the insertion part formed thereinside, wherein the connection part has a structure which thermally expands above a predetermined temperature such that the inner periphery of the accommodation portion presses the outer periphery of the insertion part, and thermally contracts below the predetermined temperature such that the pressure on the inner periphery of the insertion part by the inner periphery of the accommodation portion is released. Due to these features, the crown can be easily removed and coupled again without breakage, such that costs and working time can be reduced.La présente invention concerne une structure d'accouplement d'un pilier prothétique et d'une couronne pour un implant, dans laquelle le pilier prothétique est vissé à une partie supérieure d'une fixation fixée à un os alvéolaire et une partie inférieure de la couronne est accouplée à une partie supérieure du pilier prothétique. Une partie d'insertion est formée au niveau d'une partie supérieure du pilier prothétique, la couronne est pourvue en son sein d'une rainure d'insertion dans laquelle la partie d'insertion est insérée et une partie de liaison, dont la périphérie externe et la surface supérieure sont accouplées à la périphérie interne et à la surface inférieure de la rainure d'insertion entre le pilier p
