口腔医学分册》1998年06期 (hypoplastic AI,HPAD、成熟不全型(hypomaturation AI,HMAI)和钙化不全型(hypocalcified AI,HCAI)。其中HCAI具有钙化不全的褐黄至桔黄色釉质,此牙本质的X线阻射性还低。
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Robust evidence exists that HCAI can be prevented and the burden reduced by as much as 50% or more.
有证据显示，预防和控制医院感染可以减少负担50%或以上。
Each year, hundreds of millions of patients all around the world are affected by health care-associated infections (HCAI).
全世界数亿病人每年都会受到卫生保健相关感染(HCAI)的影响。
Although HCAI is the most frequent adverse event in health care, its true global burden has been unknown because of the difficulty in gathering reliable data.
尽管卫生保健相关感染是卫生保健方面碰到的最常见不良事件，但是其全球负担的真实情况尚不为人知，这是由于在收集可靠数据方面存有难度。
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