Improved screw head
一种螺钉头、螺钉的技术,应用在螺钉、拉伸载荷作所特别改进的连接件、螺纹紧固件等方向,能够解决削弱系统、移植物和/或基牙厚度的等量减少、总尺寸不能改变等问题,达到减少摩擦的效果
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[0077] Figure 1A and B show a base screw 1 according to a prior art system. It comprises a screw shaft 2 extending along a longitudinal axis 5 . At its distal end, the shaft 2 includes a threaded portion 3, the size and pitch of which are selected to engage the internally threaded hole of the implant. At its opposite end, the shaft 2 is connected to the screw head 4 . The head 4 contains in its coronal end a hollow 6 shaped to allow the insertion of a driving tool such as a screwdriver. The hollow 6 has a non-circular symmetrical profile enabling torque to be transmitted from the driving tool to the screw 1 .
[0078] The maximum radius R of the bottom or top of the head 4 2 Greater than the maximum radius R of axis 2 1 . This results in an annular contact surface formed by the underside 8 of the screw head 4 . Since the abutment or other member to which the screw engages must include a screw channel dimensioned to allow passage of the screw shaft 2, the maximum possibl...
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