阻生齿很难保持清洁，这往往造成蛀牙和牙龈病的发病率增加。

Crooked teeth are more difficult to keep clean. This usually results in a greater incidence of tooth decay and gum diseases.

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探讨下颌第三磨牙的牙尖数与牙根数的关系，为临床拔除阻生齿提供依据。

This work is to study the relationship of mandibular third molars between the number of dental cusps and that of roots.

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结论：甲硝唑片置入阻生齿或无髓牙拔牙窝内可以起到预防干槽症的作用。

Conclusion: Metronidazole Tablets placed into the extraction wound of impacted teeth and pulpless teeth may provide prevention against dry socket.

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