Near-infrared transillumination and reflection in the wavelength range from 1,050 nm to 1,550 nm for the in vitro detection of occlusal and proximal caries validated by microtomography

• Applicants: Dr. Katrin Heck; Dr. Friederike Litzenburger
• Subject Area: Dentistry, Oral Surgery
• Term: since 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 494559609

The aim of this research project is the development and investigation of a light-optical in vitro model to perform caries detection experiments on human molars and premolars using near-infrared transillumination and near-infrared reflection with long-wave light from 1,050 to 1,550 nm. Validation will be done using microcomputer tomography. The investigations are intended to identify the optimal wavelength for these options of light-optical caries diagnostics. Current systems on the market only work with wavelengths of 780 nm or 850 nm and have limited sensitivity. Based on other basic research, it can be assumed that an increase in wavelengths will lead to a significant improvement in diagnostic potential. For proximal caries diagnostics, an additional consideration from three angles is planned, as a possible improvement of the diagnostic performance of near-infrared transillumination and reflection is to be investigated by this three-dimensional approach. To determine the necessary minimum requirements for the camera system, two systems with different resolutions will therefore be tested. The aim is to identify an optimal optical imaging method and corresponding wavelength for the diagnosis of primary lesions on occlusal and proximal surfaces, which is radiation-free and repeatable. This could significantly improve the early detection of initial lesions as well as the correct assessment of advanced hidden caries. The precisely reproducible early detection of carious lesions does not only prevent the development of deeper defects, but also enables a substance-preserving therapy and caries monitoring. Systematic monitoring of initial lesions also allows the prevention of invasive overtreatment. Innovative diagnostic tools with high diagnostic validity for the presence and degree of progression of carious lesions are urgently needed in dentistry for these reasons.

• DFG Programme: Research Grants
• Co-Investigator: Professor Dr. Karl-Heinz Kunzelmann