目的：了解金属全冠对舰艇人员折裂牙修复的作用。

Objective: To find out the effect of metal full crown in the restoration of seamen's split teeth.

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目的探讨在折裂牙治疗中，不同的裂纹方向与患牙预后是否存在相关性。

Objective To investigate the relationship between trouble tooth prognosis and the cracking direction in fractured tooth treatment.

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结论：金属全冠对舰艇人员折裂牙的修复非常有效，应作为折裂牙修复之首选。

Conclusion: The method of restoring seamen's split teeth with metal full crown is very effective, and should be chosen first.

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