Objective To research the clinical features and differences of metastatic tumors in gingivae.

目的探讨牙龈转移癌的临床特点与鉴别。

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To compare different modes of powered toothbrushing against each other for plaque reduction and the health of the gingivae.

比较各种不同模式的电动牙刷，对于牙菌斑的减少和牙龈的健康的效果。

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To compare different modes of powered toothbrushing against each other for plaque reduction and the health of the gingivae.

比较各种不同模式的电动牙刷，对于牙菌斑的减少和牙龈的健康的效果。

youdao