| 摘要 |
<p>The present invention comprises: grip portions which are gripped by the hand of a user and are crossed around a hinge portion when an external force is applied; and unit holding portions which are extended at the opposite ends of the grip portions around the hinge portion and interlock the crossing of the grip portions. The unit holding portions comprise: arm portions which extend at a predetermined length from the grip portions so as to vertically and horizontally bend in accordance with an oral structure; and drawing portions, which are formed at the ends of the arm portions, comprising an inclined pressurization plane having an acute angle for encompassing the outer circumference of a conical shape of an exposure inclined portion of an abutment at both sides so as to compress the same.</p> |
