| 摘要 |
<p>PURPOSE: To achieve high friction, good thrust dispersion, and long life, in a tooth crown for fitting a removable tooth outfit, by providing the crown with first and second frictional grooves, a tongue-side functional surface that is extended between both the frictional grooves, and a gum upper neck stepped part in the range of the functional surface. CONSTITUTION: A first frictional groove 3 is disposed to the distal side of the tongue on the outside of a tooth crown 1, and a second frictional groove 4 is disposed to the mesial side of the tongue. A third frictional groove 8 is formed on a tongue-side functional surface 5, and this increases the frictional surface between the material pattern and paternal pattern and also guarantees the inclination. The frictional groove 3 is within the range of a supporting surface 7, is formed as a flat surface, and is finished in a gum neck stepped part 6 on the lower side. The supporting surface 7 performs supporting and also disperses the thrusting force. A groove 10 formed from the supporting surface 7 through the tooth crown 1 is arranged so that it is extended nearly parallel to the tongue-side functional surface 5 and also that the frictional grooves 3, 4 are situated on the outside of the groove 10. A tooth-crown strip 1, 1 remains between the tongue-side functional surface 5 and the groove 10 and in enclosed by the paternal pattern like a nest of boxes having confined parallel wall.</p> |
