- 1. 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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- 2. 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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- 3. 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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