13C-尿素呼气试验是检测人类胃中幽门螺杆菌是否存在的一种非侵入性检查方法。其原理是幽门螺杆菌(HP)具有较强的尿素酶,它能分解胃中的尿素,当摄入稳定同位素13C--- ...
口腔护理专家认为,牙膏的基本功能是清洁牙齿和预防蛀牙,这两点应该是选择牙膏的主要依据。牙膏是通过摩擦剂来清洁牙齿的,所以摩擦剂的质量是辨别牙膏质量的主要依据。
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