In cast metal post and core group 4 teeth were found root fracture, 3 cast metal post and core were loose and 8 teeth were with gingival grey line.
而铸造金属桩核组发生根折4颗、铸造金属桩核脱落3颗，出现牙龈色素沉着8颗。
Abstract : Abstract: Neutrophils in gingival crevice are the first line against invading periodontal pathogens.
摘要 [摘要] 龈沟内的中性粒细胞是抵御牙周致病菌入侵的第一道防线。
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