Attenuation of near-ultraviolet, visible and near-infrared light in sound and carious human enamel and dentin,Clinical Oral Investigations

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Attenuation of near-ultraviolet, visible and near-infrared light in sound and carious human enamel and dentin
Clinical Oral Investigations ( IF 3.1 ) Pub Date : 2022-05-19 , DOI: 10.1007/s00784-022-04541-7
Katrin Berghammer ₁ , Friederike Litzenburger ₁ , Katrin Heck ₁ , Karl-Heinz Kunzelmann ₁

Affiliation

Objectives

This in vitro study aimed to investigate the optical attenuation of light at 405, 660 and 780 nm sent through sound and carious human enamel and dentin, including respective individual caries zones, as well as microscopically sound-appearing tissue close to a carious lesion.

Materials and methods

Collimated light transmission through sections of 1000–125-µm thickness was measured and used to calculate the attenuation coefficient (AC). The data were statistically analysed with a MANOVA and Tukey’s HSD. Precise definition of measurement points enabled separate analysis within the microstructure of lesions: the outer and inner halves of enamel (D1, D2), the translucent zone (TZ) within dentin lesions and its adjacent layers, the enamel side of the translucent zone (ESTZ) and the pulpal side of the translucent zone (PSTZ).

Results

The TZ could be distinguished from its adjacent layers and from caries-free dentin at 125 µm. Sound-appearing dentin close to caries lesions significantly differed from caries-free dentin at 125 µm. While sound and carious enamel exhibited a significant difference (p < 0.05), this result was not found for D1 and D2 enamel lesions (p > 0.05). At 405 nm, no difference was found between sound and carious dentin (p > 0.05).

Conclusions

Light optical means enable the distinction between sound and carious tissue and to identify the microstructure of dentin caries partially as well as the presence of tertiary dentin formation. Information on sample thickness is indispensable when interpreting the AC.

Clinical relevance

Non-ionising light sources may be suitable to detect lesion progression and tertiary dentin.

中文翻译：

近紫外、可见和近红外光在健全和龋齿的人类牙釉质和牙本质中的衰减

目标

这项体外研究旨在研究 405、660 和 780 nm 光的光学衰减，这些光通过健全和龋齿的人类牙釉质和牙本质，包括各个单独的龋齿区，以及靠近龋齿的显微镜下出现声音的组织。

材料和方法

测量通过 1000–125 µm 厚度截面的准直光透射率，并用于计算衰减系数 (AC)。使用 MANOVA 和 Tukey 的 HSD 对数据进行统计分析。测量点的精确定义可以在病变的微观结构内进行单独分析：牙釉质的外半部和内半部（D1，D2），牙本质病变及其相邻层内的半透明区（TZ），半透明区的牙釉质侧（ESTZ） ) 和半透明区 (PSTZ) 的牙髓侧。

结果

TZ 可以与其相邻层和 125 µm 的无龋牙本质区分开来。在 125 µm 处，靠近龋损处的健全牙本质与无龋牙本质显着不同。虽然健全和龋齿釉质表现出显着差异（p < 0.05），但在 D1 和 D2 牙釉质病变中没有发现这一结果（p > 0.05）。在 405 nm 处，健全和龋齿牙本质之间没有发现差异（p > 0.05）。