Objective

Restorative and prosthetic materials should provide an appearance similar to natural teeth under all light conditions, including UV-rich environments and daylight. Various studies claim that UV-induced fluorescence makes teeth whiter and brighter in daylight. The aim of this paper is to determine experimentally the significance of tooth fluorescence in natural sunlight on perceived tooth color.

Methods

A total of 35 extracted, hydrated teeth without restorations or endodontic treatments were evaluated in an experimental setup. A UV/VIS spectrometer using a reflectance/backscattering probe was used to collect the reflected spectrum. Unfiltered and filtered sunlight was used for irradiation of the samples so as to use the combined ultraviolet and visible spectrum (UV/VIS) and the visible spectrum (VIS) exclusively. Color coordinates for each group were measured using the CIE L*a*b* 1976 system, averaged, and compared.

Results

The average color difference between both groups (UV/VIS and UV) was ΔE* 0.527. The average tooth color for the VIS group was L*_VIS 72.21, a*_VIS −2.42, and b*_VIS 22.35, and for the UV/VIS group was L*_UV/VIS 72.00, a*_UV/VIS −2.47, and b*_UV/VIS 22.44.

Significance

UV induced fluorescence from sunlight does not make teeth whiter and brighter.

中文翻译：

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紫外线在正常光照条件下对可见牙齿颜色的影响

客观的

在所有光照条件下，包括富含紫外线的环境和日光下，修复和修复材料应提供与天然牙齿相似的外观。各种研究声称，紫外线诱发的荧光使牙齿在日光下更白，更亮。本文的目的是通过实验确定自然日光下牙齿荧光对感知到的牙齿颜色的重要性。

方法

在实验装置中评估了35颗未修复或未进行牙髓治疗的水合牙齿。使用使用反射/反向散射探针的UV / VIS光谱仪收集反射光谱。使用未经过滤和过滤的阳光照射样品，以便仅使用组合的紫外和可见光谱（UV / VIS）和可见光谱（VIS）。使用CIE L * a * b * 1976系统测量每组的颜色坐标，取平均值并进行比较。

结果

两组之间（UV / VIS和UV）的平均色差为ΔE* 0.527。VIS组的平均牙齿颜色为L * _VIS 72.21，a * _VIS -2.42和b * _VIS 22.35，而UV / VIS组的平均牙齿颜色为L * _{UV / VIS} 72.00，a * _{UV / VIS} -2.47和b *_{紫外线/ VIS} 22.44。

意义

UV诱导的阳光中的荧光不会使牙齿变白和变亮。