Beam profile measurements for dental phototherapy: The effect of distance, wavelength and tissue thickness

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

Standard

Beam profile measurements for dental phototherapy : The effect of distance, wavelength and tissue thickness. / Palin, William M.; Hadis, Mohammed A.; Milward, Michael R.; Carroll, James D.; Cooper, Paul R.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9309 Society of Photo-Optical Instrumentation Engineers, 2015. 930905.

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

Harvard

Palin, WM, Hadis, MA, Milward, MR, Carroll, JD & Cooper, PR 2015, Beam profile measurements for dental phototherapy: The effect of distance, wavelength and tissue thickness. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 9309, 930905, Society of Photo-Optical Instrumentation Engineers, Mechanisms for Low-Light Therapy X, San Francisco, United States, 7/02/15. https://doi.org/10.1117/12.2077628

APA

Palin, W. M., Hadis, M. A., Milward, M. R., Carroll, J. D., & Cooper, P. R. (2015). Beam profile measurements for dental phototherapy: The effect of distance, wavelength and tissue thickness. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 9309). [930905] Society of Photo-Optical Instrumentation Engineers. https://doi.org/10.1117/12.2077628

Vancouver

Palin WM, Hadis MA, Milward MR, Carroll JD, Cooper PR. Beam profile measurements for dental phototherapy: The effect of distance, wavelength and tissue thickness. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9309. Society of Photo-Optical Instrumentation Engineers. 2015. 930905 https://doi.org/10.1117/12.2077628

Author

Palin, William M. ; Hadis, Mohammed A. ; Milward, Michael R. ; Carroll, James D. ; Cooper, Paul R. / Beam profile measurements for dental phototherapy : The effect of distance, wavelength and tissue thickness. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9309 Society of Photo-Optical Instrumentation Engineers, 2015.

Bibtex

@inproceedings{1b43d536d1a9479791ed4c39f534dcc5,
title = "Beam profile measurements for dental phototherapy: The effect of distance, wavelength and tissue thickness",
abstract = "Light delivery for potential bacterial disinfection (UV/blue) and photobiomodulation (near-IR) requires specific, concentrated and controllable local irradiance and dose. Dental targets for light irradiation involve dentine, which scatters, absorbs and reflects light, reducing local irradiance. This study compared the effectiveness of LEDs (400-900nm) and lasers (660nm and 810nm) to penetrate dentine. Caries-free wisdom teeth were sectioned through the Pulpchamber by either cutting perpendicular to the crown, the buccal aspect or obliquely. Specimens were wet-polished to 1, 2 or 3mm thicknesses to expose the dentine on opposing surfaces. The beam profile of the LEDs/lasers were measured through dentine specimens (n=5) to obtain beam width following optical calibration, and spatial irradiance distribution following photodiode power calibration. There were no significant differences in the percentage power and irradiance transmitted through different dentine specimens between LEDs and lasers (P>0.05). However, light penetration through tissue was wavelength dependent and highest for red and near-IR wavelengths (P<0.05) for specimens cut perpendicular to the crown compared with buccal and oblique specimens. The beam diameters increased and irradiance decreased significantly (P<0.05) with increasing specimen thickness/distance for both LEDs and lasers. There was a noticeable shift in beam position for all light sources in buccal and oblique specimens. Data indicated that dentine tubule orientation may alter the direction of light through the tissue. Optimal light penetration and distribution through dentine at specific distance is best achieved with a flat-top beam distribution vertically through the crown of the toot.",
keywords = "beam profile, LLLT, photobiomodulation, transmission through dentine",
author = "Palin, {William M.} and Hadis, {Mohammed A.} and Milward, {Michael R.} and Carroll, {James D.} and Cooper, {Paul R.}",
year = "2015",
doi = "10.1117/12.2077628",
language = "English",
isbn = "9781628413991",
volume = "9309",
booktitle = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
publisher = "Society of Photo-Optical Instrumentation Engineers",
address = "United States",
note = "Mechanisms for Low-Light Therapy X ; Conference date: 07-02-2015 Through 08-02-2015",

}

RIS

TY - GEN

T1 - Beam profile measurements for dental phototherapy

T2 - Mechanisms for Low-Light Therapy X

AU - Palin, William M.

AU - Hadis, Mohammed A.

AU - Milward, Michael R.

AU - Carroll, James D.

AU - Cooper, Paul R.

PY - 2015

Y1 - 2015

N2 - Light delivery for potential bacterial disinfection (UV/blue) and photobiomodulation (near-IR) requires specific, concentrated and controllable local irradiance and dose. Dental targets for light irradiation involve dentine, which scatters, absorbs and reflects light, reducing local irradiance. This study compared the effectiveness of LEDs (400-900nm) and lasers (660nm and 810nm) to penetrate dentine. Caries-free wisdom teeth were sectioned through the Pulpchamber by either cutting perpendicular to the crown, the buccal aspect or obliquely. Specimens were wet-polished to 1, 2 or 3mm thicknesses to expose the dentine on opposing surfaces. The beam profile of the LEDs/lasers were measured through dentine specimens (n=5) to obtain beam width following optical calibration, and spatial irradiance distribution following photodiode power calibration. There were no significant differences in the percentage power and irradiance transmitted through different dentine specimens between LEDs and lasers (P>0.05). However, light penetration through tissue was wavelength dependent and highest for red and near-IR wavelengths (P<0.05) for specimens cut perpendicular to the crown compared with buccal and oblique specimens. The beam diameters increased and irradiance decreased significantly (P<0.05) with increasing specimen thickness/distance for both LEDs and lasers. There was a noticeable shift in beam position for all light sources in buccal and oblique specimens. Data indicated that dentine tubule orientation may alter the direction of light through the tissue. Optimal light penetration and distribution through dentine at specific distance is best achieved with a flat-top beam distribution vertically through the crown of the toot.

AB - Light delivery for potential bacterial disinfection (UV/blue) and photobiomodulation (near-IR) requires specific, concentrated and controllable local irradiance and dose. Dental targets for light irradiation involve dentine, which scatters, absorbs and reflects light, reducing local irradiance. This study compared the effectiveness of LEDs (400-900nm) and lasers (660nm and 810nm) to penetrate dentine. Caries-free wisdom teeth were sectioned through the Pulpchamber by either cutting perpendicular to the crown, the buccal aspect or obliquely. Specimens were wet-polished to 1, 2 or 3mm thicknesses to expose the dentine on opposing surfaces. The beam profile of the LEDs/lasers were measured through dentine specimens (n=5) to obtain beam width following optical calibration, and spatial irradiance distribution following photodiode power calibration. There were no significant differences in the percentage power and irradiance transmitted through different dentine specimens between LEDs and lasers (P>0.05). However, light penetration through tissue was wavelength dependent and highest for red and near-IR wavelengths (P<0.05) for specimens cut perpendicular to the crown compared with buccal and oblique specimens. The beam diameters increased and irradiance decreased significantly (P<0.05) with increasing specimen thickness/distance for both LEDs and lasers. There was a noticeable shift in beam position for all light sources in buccal and oblique specimens. Data indicated that dentine tubule orientation may alter the direction of light through the tissue. Optimal light penetration and distribution through dentine at specific distance is best achieved with a flat-top beam distribution vertically through the crown of the toot.

KW - beam profile

KW - LLLT

KW - photobiomodulation

KW - transmission through dentine

UR - http://www.scopus.com/inward/record.url?scp=84926432164&partnerID=8YFLogxK

U2 - 10.1117/12.2077628

DO - 10.1117/12.2077628

M3 - Conference contribution

AN - SCOPUS:84926432164

SN - 9781628413991

VL - 9309

BT - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

PB - Society of Photo-Optical Instrumentation Engineers

Y2 - 7 February 2015 through 8 February 2015

ER -