注意：出现在牙龈缘桥。

Note appearance of pontic at gingival margin.

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不恰当的刷牙方法会损害牙齿，如果你真的太用力刷牙，就会磨损牙齿边缘，在牙龈缘附近形成V字形缺口。

Poor tooth brushing techniques can harm your teeth - if you really scrub your teeth too hard, you will wear the sides of your teeth down, leaving V-shaped defects near the gum margins.

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从颜色变化、边缘密合性、颈缘染色、崩瓷、牙龈炎等指标进行临床检查。

We compared the clinical examination from color diversity, cervical margin's dense and fit nature, cervical margin's coloration, collapsing porcelain and gingivitis and so on.

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