The third molar eruption 第三磨牙萌出
the third molar angulation 第三磨牙倾角
The maxillary third molar 上颌第三磨牙
the third mandibular molar 下颌智齿
the mandibular third molar 下颌第三磨牙
the upper third molar extraction 上颌第三磨牙拔除术
The impacted mandibular third molar 下颌低位阻生第三磨牙
The first molar has the most serious tooth wear and the third molar was the lightest.
第一磨牙的磨耗程度最重，第三磨牙的磨耗程度最轻。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
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