Color and translucency of in vivo natural central incisors
Color and translucency of in vivo natural central incisors
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DOI：
10.1016/s0022-3913(00)70036-9
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发表时间：
2000-04-01
影响因子：
4.6
通讯作者：
Kawaguchi, S
中科院分区：
文献类型：
--
作者：
Hasegawa, A;Ikeda, I;Kawaguchi, S
问题陈述：色度指南中的色度范围与天然牙齿的色度范围不一致，并且没有关于所有年龄组天然牙齿的颜色和透明度的信息。因此，获得一个广泛年龄组天然牙齿特征的数据库是很重要的。本研究获得了各年龄组天然牙的颜色和半透明信息，并试图阐明天然牙与VITA Lumin真空阴影指南在颜色和半透明方面的差异。材料和方法。对87名受试者（42名男性，45名女性，年龄13 - 84岁）的自然中门牙和16种VITA Lumin真空门牙指南进行了评估。根据CIELAB颜色空间，使用彩色计算机测量单个牙齿表面上直径为1.0 mm的5个位点的L*、a*和b*的颜色和半透明度。在中心位点，年龄与L*呈负相关，与b*呈正相关。自然牙的a*和b*在向颈椎方向移动时均增加，但在向牙根方向移动时透明度降低。天然牙的a*值明显高于VITA Lumin真空遮蔽导轨。这项研究发现，年龄越大的受试者，天然牙齿中心部位的颜色越深、越黄。从切牙到颈牙，天然牙的红色和黄色都有增加的趋势，而半透明则减少。VITA Lumin真空遮光指南的红绿色度分布不均匀，无法覆盖天然牙。
Statement of problem, The range of shades in shade guides is not consistent with natural teeth, and there is no information on the color and translucency of the natural tooth for all age groups Therefore, it is important tc, obtain a database of the characteristics of the natural tooth from a wide age group.Purpose. This study obtained information on color and translucency of natural teeth for all age groups, and attempted to clarify the difference of the color and translucency between natural teeth and VITA Lumin Vacuum shade guide.Material and methods. Natural central incisors of 87 subjects (42 men and 45 women; age range from 13 to 84 years) and 16 shades of VITA Lumin Vacuum shade guide were evaluated. Color and translucency of 5 sites, each 1.0 mm in diameter, on the surfaces of individual teeth were measured for L*, a*, and b*, using a color computer according to CIELAB color spaces.Results. At the center site, negative correlation was found between age and L*, with positive correlation between age and b*. Both a* and b* of the natural tooth increased when moving in the direction of the cervical site, but translucency decreased in the direction of the root. The a* value fur the natural tooth was significantly higher than those for VITA Lumin Vacuum shade guide.Conclusion. This study found that the older the subject, the darker and more yellow the color at the center site of the natural tooth. Both reddish and yellowish colors of natural teeth tend lu increase from the incisal to cervical, whereas translucency decreases. Red-green chromaticity of VITA Lumin Vacuum shade guide was not distributed to cover the natural tooth.