| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic impression tray for an upper jaw, which enables an impression to be taken with a high degree of accuracy by preventing lift or separation from a tray for an impression material after curing.SOLUTION: An outer wall 2 and a bulge portion 3 for closing a U-shaped space between bottoms 1 are provided on the outside including an U-shaped end of the bottom 1 forming a plane assuming a U-shape with an expanded section between ends and having almost the same width. A rim 4 with a specific height is provided on the side of the bottom 1 along an upper end of the outer wall 2. On the outer wall 2, a slot-like through-hole 5 with a specific width, which reaches the bottom 1 from directly below the rim 4 in such a manner as to be perpendicular to the rim 4, is provided in the outer wall 2, which does not include the U-shaped end, in such a manner that an adjacent gap is specific times wider than the through-hole 5. A similar slot-like through-hole 6 is also provided in the bulge portion 3. A circular through-hole 7 with a specific diameter is provided in the center of the adjacent interval of the slot-like through-hole 5, which is provided in the outer wall 3, in the bottom 1. Furthermore, slot-like end-side through-holes 8 with a specific width and a specific length are provided at the U-shaped end, on a line connecting bottom-side ends of the respective slot-like through-holes 5 and 6 positioned nearest to the U-shaped end sides of the outer wall 2 and the bulge portion 3 or on the end side with respect to the line and on the end side of the center of the bulge portion 3, respectively. |
