The combined use of a nonabrasive, activator-containing toothpaste and a light emitting diode device improves the onset time of tooth whitening

ABSTRACT Objective: The objective of this randomized clinical study was to assess the onset time of the whitening effect of a combined use of a nonabrasive, activator-containing toothpaste and a light emitting diode (LED) device, compared to that of the toothpaste alone. Materials and Methods: A nonabrasive, activator-containing toothpaste was used twice daily alone or combined with an LED device for 15 days. The onset of the tooth whitening effect was evaluated through tooth color (a* b*, CIELAB) and tooth whiteness (WIO) by image analysis of standardized images. Local tolerance was assessed at days 1, 8, and 15. Results: On day 8, a significant (P = 0.003) tooth whitening effect compared to day 1 was observed with the toothpaste and the LED device, sustaining until the end of the study. Whitening using the toothpaste alone was significant compared to day 1 after 15 days, only. One subject reported mild redness, itching, and burning on day 1 on the gum of the lower jaw that was possibly related to with the toothpaste. The subject withdrew from the study. No adverse event was reported in the group using the LED device. Conclusion: Both tooth whitening methods had a significant whitening effect after 15 days of use. However, the onset of whitening was significantly faster when using the nonabrasive, activator-containing toothpaste combined with an LED device. The toothpaste and LED device were both safe.

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The Flexmount Ringlight: An Inexpensive Lighting Solution for Intraoral Photodocumentation

Philippine Journal of Otolaryngology Head and Neck Surgery ◽

10.32412/pjohns.v24i1.709 ◽

2009 ◽

Vol 24 (1) ◽

pp. 21-26

Author(s):

Michael Joseph C. David ◽

Antonio H. Chua

Keyword(s):

Oral Cavity ◽

Light Emitting Diode ◽

Tertiary Care ◽

Motion Blur ◽

Care Hospital ◽

Digital Cameras ◽

Light Emitting ◽

Quick Release ◽

The Subject ◽

Working Distance

Objective: To fabricate an inexpensive, reproducible and portable ringlight with flexible, quick-release mount for use with point-and-shoot consumer digital cameras in intraoral photodocumentation Materials and Methods: Design: Instrumentation Setting: Tertiary Care Hospital Procedure: A commercially-available battery-powered mountaineer’s LED (Light Emitting Diode) headlight (manufacturer, place) was converted into a portable ringlight with a flexible, quick-release mount for intraoral photodocumentation. Results: The Flexmount Ringlight delivered an even and white illumination of the oral cavity and oropharynx at a working distance of more than 5cm from the subject in focus. It resulted in sharper pictures due to its constant illumination that assisted the camera’s autofocus system in getting accurate focusing intraorally. It also allowed the camera to use smaller apertures that have put more elements in focus, and faster shutter speeds that have markedly reduced motion blur. Conclusion: The Flexmount Ringlight is an inexpensive, easy-to-assemble and portable ringlight that can be used in point-and-shoot consumer digital cameras. Its constant and even illumination resulted in reproducible, sharp, shadowless photographs of the oral cavity and oropharynx. Keywords: ringlight, flexmount, intraoral photodocumentation

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SIMULTANEOUS HEARTBEAT AND RESPIRATION MONITORING USING PPG AND RIIV ON A SMARTPHONE DEVICE

Biomedical Engineering Applications Basis and Communications ◽

10.4015/s1016237213500415 ◽

2013 ◽

Vol 25 (04) ◽

pp. 1350041 ◽

Cited By ~ 3

Author(s):

Yue-Der Lin ◽

Hu-Ying Ho ◽

Ching-Che Tsai ◽

Shih-Fan Wang ◽

Kang-Ping Lin ◽

...

Keyword(s):

Home Care ◽

Signal Detection ◽

Respiratory Rate ◽

Blood Vessels ◽

Preventive Medicine ◽

Light Emitting Diode ◽

Light Emitting ◽

Respiration Monitoring ◽

The Subject ◽

Circulatory Diseases

Photoplethysmography (PPG) is a technique based on photonics related to the volumetric changes in blood vessels during circulation. PPG has been widely applied in monitoring respiration, hypervolemia and other circulatory diseases. The smartphone becomes more popular nowadays. As the smartphone is usually equipped with light-emitting diode (LED) and camera, the imaging function in smartphone is proposed for PPG signal detection. An algorithm termed as the autoregressive (AR) decomposition is presented to extract the respiratory rate and pulse rate of the subject buried in the PPG measurement. The extracted information is verified by those derived from commercial equipments and the derived results agree well. The proposed algorithm is not complex and can be implemented in a smartphone as an application program. For its convenience in usage, the proposed strategy may be potential in telemedicine, preventive medicine and home care usage.

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Which Lighting Option Is the Best for Photography in Rhinoplasty?

Facial Plastic Surgery ◽

10.1055/s-0041-1725939 ◽

2021 ◽

Author(s):

Rodrigo Fernández-Pellón ◽

Meshari Saghir ◽

Ayman Jaber ◽

Fazil Apaydin

Keyword(s):

Light Emitting Diode ◽

Light Sources ◽

Light Emitting ◽

Direct Measurements ◽

Significant Difference ◽

Facial Plastic ◽

The Subject ◽

Led Lights ◽

Nasal Length

AbstractPhotography for preoperative analysis and follow-up is indispensable for the facial plastic surgeon. The use of strobe flash units, light-emitting diode (LED) lamps, and their position related to axis of the patient can affect the nasal contours and nasal measurements. The aim of this study was to compare the rhinoplasty pictures taken under three different lighting settings and two different positioning at 30- and 45-degree angles, and with direct measurements taken by caliper from the subjects. Standardized rhinoplasty pictures from 10 patients were taken in frontal view in a studio. These pictures were taken under three different lighting settings: built-in flash of the camera, two strobe flashes, and two LED continuous lights placed at 30 to 45 degree angles to the patient. All the pictures were uploaded to Rhinobase 2.0. In five subjects, direct measurements were done by using a Vernier caliper and compared with the computer measurements. In this study, when comparing the light sources and the angles without taking single flash into account, no relation was found between strobe lights at 30 and 45 degrees and between LED lights at 30 and 45 degrees regarding tip width, base bony width, dorsum width, interalar width, and nasal length. However, a statistically significant difference was found when the angle was changed from 30 to 45 degrees for tip width, interalar width and nasal length. The use of two LED continuous lights or two strobe lights in a studio setting has given similar results. Changing the angles of the light sources from 30 to 45 degrees affected only the tip width and the interalar width; otherwise the rest of the nasal measurements did not show any significant changes. The pictures taken at 45-degree angles to the subject showed the closest values to the direct measurements done on the patient

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A Dictionary of Mechanical Engineering

10.1093/acref/9780198832102.001.0001 ◽

2019 ◽

Author(s):

Marcel Escudier ◽

Tony Atkins

Keyword(s):

Mechanical Engineering ◽

Chemical Engineering ◽

Light Emitting Diode ◽

Physical Constant ◽

Light Emitting ◽

Materials Engineering ◽

Atomic Force ◽

Aeronautical Engineering ◽

Subject Areas ◽

The Subject

Over 8,000 entries This Dictionary provides definitions and explanations for mechanical engineering terms in clear and concise A to Z entries, many illustrated. This new edition greatly expands the coverage of materials engineering terms, with a complete revision of the existing entries and the addition of more than 200 new ones in this area. Other new entries include atomic force microscope, epitrochoid, fundamental physical constant, light-emitting diode, motor generator unit, Ohm’s law, and turbomachine. Also touched upon are related subject areas such as acoustics, bioengineering, chemical engineering, civil engineering, aeronautical engineering, and environmental engineering. It is the most comprehensive and authoritative dictionary of its kind, and an essential reference for students of mechanical engineering and for anyone with an interest in the subject.

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High-speed non-invasive thermal analysis of high-power light-emitting diode arrays

10.32469/10355/8133 ◽

2010 ◽

Author(s):

Nicholas M. Rada

Keyword(s):

Thermal Analysis ◽

High Power ◽

High Speed ◽

Light Emitting Diode ◽

Light Emitting ◽

Non Invasive

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Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

10.32792/utq/utjsci/vol7/2/31 ◽

2020 ◽

pp. 144-148

Keyword(s):

Quantum Dot ◽

Delay Time ◽

Chaos Synchronization ◽

Optical Feedback ◽

Light Emitting Diode ◽

Feedback Effect ◽

Complete Synchronization ◽

Light Emitting ◽

Coupling Methods ◽

Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

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