Color of natural tooth crown in Japanese people

Dental bleaching efficacy with diode laser and LED irradiation: An in vitro study

“…Gibb et al showed [25] in a study involving 473 subjects from six different US sites, that the mean b* value of the patients at these sites is 17.7 and the corresponding mean L* value is 74. Hasegawa et al [26] performed a study of the natural tooth color on 87 subjects in Japan and measured a mean L* value of 73 and mean b* value of 16.5. At these L* values strong saturation of almost all hues is possible and, therefore, the chroma value is an issue.…”

Tooth colour: a review of the literature

“…Hasegawa et al 67,87 measured the colour in five different locations along the tooth axis of the labial surface of the central incisors using spectrophotometry and found significant variations in L* a* b* values along this axis. For L* ; the lightest portion of the tooth was in the centre (ca.…”

“…In general, the maxillary anterior teeth are slightly more yellow than mandibular anterior teeth, 40 and the maxillary central incisors are higher in value than the lateral incisors and canines. 40,64,67,87 There are no significant differences in tooth colour between males and females according to a number of studies involving natural teeth. 23,67 In contrast, a recent study 7 has shown that compared to men, women had statistically lighter and less yellow teeth when tested at the population mean of a group of 180 people from the USA, with L* approximately 3.7 units lower on average in males compared to females for maxillary central incisors.…”

“…7,23,40,64,67,87 -89 With advancing age, it has been reported that the colour can increase in redness at the incisal site because of the long term occlusal wear loss in the incisor region. 67 The impact of age on tooth colour is due to a number of factors. As the dental pulp ages it shrinks, leaving secondary dentine in its wake.…”

Development of a whiteness index for dentistry

“…The use of a tele-spectroradiometer TSR to assess tooth color is a non-contact and objective method that has been used in dentistry. [11][12][13] A Minolta CS1000 TSR was used in this study to measure the spectral reflectance factors (and hence the color coordinates) of the shade guide tabs since it can measure colors in a way that matches the geometry of the visual assessments (samples positioned about 40 cm away from the subject and viewed at an angle of about 458). The setup for measurement using the Minolta CS1000 is shown in Fig.…”