| 摘要 |
A torsional tightener system for anchoring elements or tools in bone or dentine or in implants anchored in bone or dentine sufficiently compact to be inserted into the mouth includes an electric motor with a small rotating mass operating at high speed, powered by an energy supply circuit, and imparting a high level of torque with a high degree of sensitivity over a small range; means for controlling the speed of the motor; means for selecting an operating range of speeds and torques; a torsional tightening part actuated by the motor and cooperating with the element or tool; an energy supply varying the energy supplied to the motor; means for releasing the torsional tightener at a preset torque; means for determining the preset torque; the preset torque value and a predetermined parameter value at least partially based upon increasing resistance from the element as it is tightened; controlling means for sensing the torque from the tool or element being anchored and for interrupting the energy supply circuit at the predetermined parameter value such that the controlling means controls the rotational inertia of the torsional tightener system permitting it to rotate beyond a point where it is located when the energy is interrupted bringing about a torsional tightening moment near a preselected optimal point substantially near but not exceeding the breaking point of a weaker member of the group consisting of: the element, tool, and implant and bone, dentine in which the element or tool is anchored.
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