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Al-Obaidi R, Salehi H, Collart-Dutilleul PY, Jacquot B, Tassery H, Cuisinier FJG, Gergely C, Cloitre T. Relationship between Changes in Chemical Composition of Enamel Subsurface Lesions and the Emitted Nonlinear Optical Signals: An in vitro Study. Caries Res 2020; 54:144-153. [PMID: 32107346 DOI: 10.1159/000505904] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Accepted: 01/10/2020] [Indexed: 02/05/2023] Open
Abstract
The development of new diagnostic technologies based on the light scattering and autofluorescence properties of dental tissues is required to improve the diagnostic ability of initial caries lesions earlier than previously done and promoting the potential of treatment without surgical intervention. The aim of this study is to correlate fluorescence-based results provided by multiphoton microscopy (MPM) with confocal Raman microscopy records using phosphate level at 960 cm-1 and the organic matrix at ∼2,931 cm-1 in healthy and demineralized human enamel. Measurements on 14 teeth were made using two incident lights of different wavelengths, released by confocal Raman microscopy and MPM. Raman phosphate peak intensity at 960 cm-1 along with organic to mineral ratio at (2,931/430 cm-1) and nonlinear optical signals (second harmonic generation [SHG] and intrinsic two-photon excited fluorescence [I2PEF]) were recorded from the demineralized and healthy enamel sites. Raman spectral maps showed that the higher the organic/mineral ratio in the demineralized enamel, the lower the intensity of mineral component in the same zone. MPM revealed new optical indicators of carious lesion as shown by the presence of a red-shifted fluorescence peak in the 650- to 750-nm area of the fluorescence spectrum of demineralized enamel. Moreover, on sample regions with insignificant autofluorescence, the emergence of the SHG signal could be noted. By comparing I2PEF images with the structural motifs observed by the confocal Raman imaging system, the morphological similarity of the acquired images was quite evident. Any change in the I2PEF spectra reflects alterations in the chemical composition of enamel. These findings may provide an important basis for potentially valuable applications of photonic tools in the clinical diagnosis of tooth pathological conditions, besides exposing the fundamental role of organic matrix in enamel integrity and reparation.
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Affiliation(s)
- Rand Al-Obaidi
- Laboratoire Bioingénierie et Nanosciences (LBN), University of Montpellier, Montpellier, France, .,University of Mustansiriyah, Baghdad, Iraq,
| | - Hamideh Salehi
- Laboratoire Bioingénierie et Nanosciences (LBN), University of Montpellier, Montpellier, France
| | | | | | - Hervé Tassery
- Laboratoire Bioingénierie et Nanosciences (LBN), University of Montpellier, Montpellier, France.,Aix Marseille University, Marseille, France
| | - Frederic J G Cuisinier
- Laboratoire Bioingénierie et Nanosciences (LBN), University of Montpellier, Montpellier, France
| | - Csilla Gergely
- Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France
| | - Thierry Cloitre
- Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France
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Cepeda-Pérez E, Moreno-Hernández C, López-Luke T, Monzón-Hernández D, de la Rosa E. Evaluation of bacterial presence in the root canal by Raman spectroscopy: a preliminary study. Biomed Phys Eng Express 2016. [DOI: 10.1088/2057-1976/2/6/065006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Carvalho FBD, Barbosa AFS, Zanin FAA, Brugnera Júnior A, Silveira Júnior L, Pinheiro ALB. Use of laser fluorescence in dental caries diagnosis: a fluorescence x biomolecular vibrational spectroscopic comparative study. Braz Dent J 2014; 24:59-63. [PMID: 23657415 DOI: 10.1590/0103-6440201302123] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 12/04/2012] [Indexed: 11/22/2022] Open
Abstract
The aim of this work was to verify the existence of correlation between Raman spectroscopy readings of phosphate apatite (~960 cm-1), fluoridated apatite (~575 cm-1) and organic matrix (~1450 cm-1) levels and Diagnodent® readings at different stages of dental caries in extracted human teeth. The mean peak value of fluorescence in the carious area was recorded and teeth were divided in enamel caries, dentin caries and sound dental structure. After fluorescence readings, Raman spectroscopy was carried out on the same sites. The results showed significant difference (ANOVA, p<0.05) between the fluorescence readings for enamel (16.4 ± 2.3) and dentin (57.6 ± 23.7) on carious teeth. Raman peaks of enamel and dentin revealed that ~575 and ~960 cm-1 peaks were more intense in enamel caries. There was significant negative correlation (p<0.05) between the ~575 and ~960 cm-1 peaks and dentin caries. It may be concluded that the higher the fluorescence detected by Diagnodent the lower the peaks of phosphate apatite and fluoridated apatite. As the early diagnosis of caries is directly related to the identification of changes in the inorganic tooth components, Raman spectroscopy was more sensitive to variations of these components than Diagnodent.
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Liu BH, Shi YW. Flexible silver-coated hollow fibers for remote Raman spectroscopic measurements. APPLIED OPTICS 2013; 52:5165-5170. [PMID: 23872762 DOI: 10.1364/ao.52.005165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Accepted: 06/09/2013] [Indexed: 06/02/2023]
Abstract
A Raman remote spectroscopy system was established by using flexible hollow fibers (HFs) as laser excitation fiber and signal collection fiber. Experimental evaluations with various optical fiber combinations were carried out. Experiments were conducted by using silver-coated HFs as both remote transmission fiber and sample cells for liquid sample detection. Good linearity for concentration detection of liquid was obtained with clean background and signal enhancement. Theoretical analysis was carried out to optimize the length of the liquid cell. Measured data show good agreement with the simulation result. HF has shown potentiality in applications for remote and noninvasive Raman detection.
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Affiliation(s)
- Bing-Hong Liu
- School of Information Science and Engineering, Fudan University, Handan Rd. 220, Shanghai 200433, China
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Tabatabaei N, Mandelis A, Dehghany M, Michaelian KH, Amaechi BT. On the sensitivity of thermophotonic lock-in imaging and polarized Raman spectroscopy to early dental caries diagnosis. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:025002. [PMID: 22463028 DOI: 10.1117/1.jbo.17.2.025002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Dental caries is the leading cause of tooth loss, which can promptly be prevented if detected in early stages of progression. Unfortunately, conventional diagnostic modalities currently used in dentistry lack the sensitivity to detect early caries. The authors' intention is to compare the ability of polarized Raman spectroscopy and thermophotonic imaging to make early caries diagnosis. Extracted human teeth with no visible stain or defects were artificially demineralized in accordance to a well-known protocol in dentistry for simulated early caries development at several demineralization stages. Samples were then inspected using polarized Raman spectroscopy and thermophotonic imaging. The sensitivities of these two diagnostic modalities are compared, and the results are verified using transverse micro-radiography. It was found that compared to polarized Raman spectroscopy, thermophotonic imaging exhibits superior sensitivity to very early stages of demineralization.
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Affiliation(s)
- Nima Tabatabaei
- University of Toronto, Center for Advanced Diffusion-Wave Technologies, Department of Mechanical and Industrial Engineering, Toronto, Ontario, M5S 3G8, Canada
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