| 摘要 |
The apparatus comprises an anchoring element having a lower recess and a continuous upper recess. Pins are rotatably and swivellably mounted in the recesses. The pins comprise a cylindrical portion and a spherical portion. The anchoring element is preferably first cemented with the lower pin into a hole drilled in an existing supporting tooth, whereupon a second hole in this tooth can then be drilled through the upper continuous opening in the anchoring element for receiving the upper pin. Thus, there is no need to drill exactly spaced, parallel holes in the supporting teeth, nor is there any necessity for a drilling template. |
