[The periodontal ligament in the roentgenogram].
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The chest X-rays (double exposed; focus 0.6 X 0.6 mm2; grid 10:1 ratio; FFD 2.0 m) of 90 workers employed in the production of silicon-alloys were classified according to ILO U/C 1971: 14 have been considered "border line" and 14 showed definite pathologic findings. Among the last, 10 concerned subjects who had never previously been exposed to ther dusts.
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