目的探讨下颌骨长度的可压缩性。

Objective To investigate the condensability of mandibular length.

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中年组与青年组相比，下颌骨长度明显缩短，而老年组与中年组相比，颌骨高度下降并不明显。

Jaw length decreases significantly in comparisons between the young and middle age groups, whereas the decline in jaw height from the middle to old group was noteworthy.

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同时，下颌骨在长度和高度上都会收缩。

Meanwhile, the lower jaw shrunk in both length and height.

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