(二)横纹
口腔科学

        横纹(cross striations):为釉柱上有规律间隔的细线,横纹之间的距离约为 4μm,相当于釉基质每日形成的量。横纹处矿化程度稍低,故当牙轻度脱矿时横纹较明显。Cross striations:Enamel rods have regularly spaced cross striations and the distance between the     （共 424 字）     [阅读本文] >>