Detection of early caries by laser-induced breakdown spectroscopy

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.

[1]  J J ten Bosch,et al.  Optimised microcomputer-guided quantitative microradiography on dental mineralised tissue slices. , 1987, Physics in medicine and biology.

[2]  R. Barnes,et al.  Determination of some trace elements in human tooth enamel , 2000, Fresenius' journal of analytical chemistry.

[3]  D. Cremers,et al.  Handbook of Laser-Induced Breakdown Spectroscopy: Cremers/Handbook of Laser-induced Breakdown Spectroscopy , 2006 .

[4]  G. Stookey,et al.  Emerging methods of caries diagnosis. , 2001, Journal of dental education.

[5]  J. Winefordner,et al.  Zinc analysis in human skin by laser induced-breakdown spectroscopy. , 2000, Talanta.

[6]  Leon J. Radziemski,et al.  Handbook of Laser-Induced Breakdown Spectroscopy , 2006 .

[7]  Biomedical and environmental applicationsof laser-induced breakdown spectroscopy , 2014 .

[8]  Vivek K. Singh,et al.  Importance of laser-induced breakdown spectroscopy for hard tissues (bone, teeth) and other calcified tissue materials , 2015, Lasers in Medical Science.

[9]  N. Subhash,et al.  Tooth caries detection by curve fitting of laser‐induced fluorescence emission: A comparative evaluation with reflectance spectroscopy , 2005, Lasers in surgery and medicine.

[10]  N. Farid,et al.  Effect of ambient gas conditions on laser-induced copper plasma and surface morphology , 2011 .

[11]  D. Beddows,et al.  Laser-induced breakdown spectroscopy: a tool for real-time, in vitro and in vivo identification of carious teeth , 2001, BMC oral health.

[12]  O. Samek,et al.  Quantitative analysis of trace metal accumulation in teeth using laser-induced breakdown spectroscopy , 1999 .

[13]  M Miyagi,et al.  Hollow-fiber delivery of high-power pulsed Nd:YAG laser light. , 1998, Optics letters.

[14]  K Takamori,et al.  Detection of occlusal caries under sealants by use of a laser fluorescence system. , 2001, Journal of clinical laser medicine & surgery.

[15]  Zahra Hosseinimakarem,et al.  Analysis of human nails by laser-induced breakdown spectroscopy. , 2011, Journal of biomedical optics.

[16]  B Angmar-Månsson,et al.  A new method for in vivo quantification of changes in initial enamel caries with laser fluorescence. , 1995, Caries research.

[17]  D. Bradley,et al.  Zinc, lead and copper in human teeth measured by induced coupled argon plasma atomic emission spectroscopy (ICP-AES). , 2000, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[18]  Jozef Kaiser,et al.  Quantitative laser-induced breakdown spectroscopy analysis of calcified tissue samples , 2001 .

[19]  Awadhesh K. Rai,et al.  Potential of laser-induced breakdown spectroscopy for the rapid identification of carious teeth , 2011, Lasers in Medical Science.