Detection of early caries by laser-induced breakdown spectroscopy

Shuhei Sasazawa, Satoko Kakino, Yuji Matsuura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


To improve sensitivity of dental caries detection by laser-induced breakdown spectroscopy (LIBS) analysis, it is proposed to utilize emission peaks in the ultraviolet. We newly focused on zinc whose emission peaks exist in ultraviolet because zinc exists at high concentration in the outer layer of enamel. It was shown that by using ratios between heights of an emission peak of Zn and that of Ca, the detection sensitivity and stability are largely improved. It was also shown that early caries are differentiated from healthy part by properly setting a threshold in the detected ratios. The proposed caries detection system can be applied to dental laser systems such as ones based on Er:YAG-lasers. When ablating early caries part by laser light, the system notices the dentist that the ablation of caries part is finished. We also show the intensity of emission peaks of zinc decreased with ablation with Er:YAG laser light.

Original languageEnglish
Title of host publicationClinical and Biomedical Spectroscopy and Imaging IV
ISBN (Electronic)9781628417029
Publication statusPublished - 2015 Jan 1
EventClinical and Biomedical Spectroscopy and Imaging IV - Munich, Germany
Duration: 2015 Jun 222015 Jun 24


OtherClinical and Biomedical Spectroscopy and Imaging IV


  • dental caries detection
  • hollow optical fiber
  • Laser-induced breakdown spectroscopy
  • ultraviolet spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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