后方齿孔都是看得见，对切缘。

The rear perforations are visible on the cut edge.

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切缘残留肿瘤用同样方法检查。

The incisal edge were also detected for residual tumor.

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该手术切缘是免费的肿瘤的参与。

The surgical margin is free of tumor involvement.

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所有病例手术切缘均为阴性。

Surgical margins were negative in all cases.

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安全切缘；

Safe surgical margin;

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安全切缘；

Safe surgical margin;

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