Crowded teeth 60.87% as the highest percentage in various kinds of malocclusion.

在各类错(牙合)百分比中，以牙拥挤最高(60.87%)。

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Occlusion refers to the way that the teeth fit together, and their position in the mouth. The word malocclusion means that the teeth don't fit together properly.

咬合指的是上，下牙排牙齿合到一起时位置合适，错颌畸形指的是咬合位置不合适。

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Objective: To study the tooth size correlation between permanent cuspid and bicuspid group and other teeth groups in malocclusion.

目的：研究错牙合、正常牙合的尖牙、双尖牙组与其它组牙的相关性，为尖牙、双尖牙组的预测提供科学依据。

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The exact cause of teeth grinding is not known, but the most likely culprits are things like stress, sleep disorders, crooked or missing teeth and having an abnormal bite, where the upper and lower teeth do not come together normally (known as malocclusion).

CNN: What can I do about teeth grinding?