| 摘要 |
The bifunctional screw for dental implant has a better stability upon being inserted into the bone through the modification of the geometry thereof. This device has two sections; the first section, located a the upper portion, includes a thread space and depth lower than that of a second section, since this part, upon inserting the implant into the cortical bone (hard bone), is surrounded by the bone in order to have a better fastening action in this area. The second section is different from the first section since the space and depth of the threads is higher; this achieves a higher contact area between the bone and the implant. An important characteristic of the device is that it has a squared-type thread, with which it has been confirmed that reduced shearing efforts are present at the moment an occlusal load is applied. A further characteristic is that the invention has an inner connection, with an apex end, the upper portion of the first section including a buttress connected to the crown, the visible portion of the teeth.
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