| 摘要 |
A dental impression tray fastened to teeth in one quadrant, supports through a semi-rigid, non-resilient member, an electric transducer having an input probe positioned against the lingual surface of a tooth. A strip chart recorder is electrically coupled to the transducer and produces a graph in response to movement of the tooth caused by externally manually applied bi-directional forces on the tooth. A special tool is employed to apply forces, being adapted not only to movement of molars, but also incisors.
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