| 摘要 |
A dental face-bow comprising a base part, two side arms that extend from the base part and two positioning elements, for example ear pieces for positioning the face-bow on the head of the patient. The positioning elements are situated on the side arms and can be displaced in relation to the side arms. The face-bow is also provided with a displacement device which is used to simultaneously displace the two positioning elements in relation to the side arms. To drive the positioning elements, a dial, which is situated on the base part, can be used for example to turn a flexible shaft that is rotatably mounted inside the two side arms. the two ends of the shaft are equipped with gears that co-operate with gear rods on the positioning elements. This arrangement permits the face-bow to be placed on a patient extremely gently, as there is in particular no relative displacement of the side arms. The face-bow is also provided with a nose support, which can not only be displaced in the longitudinal direction in relation to the base part, but can also be pivoted about a horizontal axis that runs laterally. The face-bow can thus be aligned in a particularly accurate manner with the infra-orbital point in accordance with the shape and size of each patient's head.
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