一象牙的特征(一)形状和颜色、物理特征形状特征:一般呈角状,表现为弯曲的弧形,其根部较粗,而牙尖较细,接近一半属于中空,通常象牙体分为牙筒与牙心。在牙髓腔至外表皮部分有辐射线分布,在结构上较为致密。颜色特征:颜色较为新鲜时呈乳白色,而史前象牙呈蓝色。通常非洲象牙的质地较为细腻,而亚洲象牙则比较疏松和柔软,因此颜色也较容易变成黄色(图1)。从象牙的物理特性来讲,其光泽表现为柔 The characteristics of an ivory (a) the shape and color, physical characteristics of shape and characteristics: the general angular, the performance of the curved arc, the root of the thicker, and the tip is thinner, nearly half of the hollow, usually divided into teeth Tube and heart. Radiation distribution in the pulp cavity to the outer epidermis, the structure is more dense. Color characteristics: milky white when the color is fresh, and prehistoric ivory blue. The texture of ivory in Africa is usually delicate, while Asian ivory is more loose and soft, so the color tends to turn yellow more easily (Figure 1). From the physical characteristics of the ivory, the gloss is soft