Polarization sensitive camera for the in vitro diagnostic and monitoring of dental erosion

Anke Bossen; Ekaterina Rakhmatullina; Adrian Lussi; Christoph Meier

doi:10.1117/12.2002386

25 March 2013 Polarization sensitive camera for the in vitro diagnostic and monitoring of dental erosion

Anke Bossen, Ekaterina Rakhmatullina, Adrian Lussi, Christoph Meier

Proceedings Volume 8566, Lasers in Dentistry XIX; 856605 (2013) https://doi.org/10.1117/12.2002386
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

Due to a frequent consumption of acidic food and beverages, the prevalence of dental erosion increases worldwide. In an initial erosion stage, the hard dental tissue is softened due to acidic demineralization. As erosion progresses, a gradual tissue wear occurs resulting in thinning of the enamel. Complete loss of the enamel tissue can be observed in severe clinical cases. Therefore, it is essential to provide a diagnosis tool for an accurate detection and monitoring of dental erosion already at early stages. In this manuscript, we present the development of a polarization sensitive imaging camera for the visualization and quantification of dental erosion. The system consists of two CMOS cameras mounted on two sides of a polarizing beamsplitter. A horizontal linearly polarized light source is positioned orthogonal to the camera to ensure an incidence illumination and detection angles of 45°. The specular reflected light from the enamel surface is collected with an objective lens mounted on the beam splitter and divided into horizontal (H) and vertical (V) components on each associate camera. Images of non-eroded and eroded enamel surfaces at different erosion degrees were recorded and assessed with diagnostic software. The software was designed to generate and display two types of images: distribution of the reflection intensity (V) and a polarization ratio (H-V)/(H+V) throughout the analyzed tissue area. The measurements and visualization of these two optical parameters, i.e. specular reflection intensity and the polarization ratio, allowed detection and quantification of enamel erosion at early stages in vitro.

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Anke Bossen, Ekaterina Rakhmatullina, Adrian Lussi, and Christoph Meier "Polarization sensitive camera for the in vitro diagnostic and monitoring of dental erosion", Proc. SPIE 8566, Lasers in Dentistry XIX, 856605 (25 March 2013); https://doi.org/10.1117/12.2002386

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KEYWORDS

Polarization

Cameras

Teeth

Reflection

Tissues

Specular reflections

In vitro testing

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