Development Of A Pulsed Light Emitting Diode Dental Photocuring System

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: 2R44DE014312-02
Agency Tracking Number: DE014312
Amount: $662,210.00
Phase: Phase II
Program: SBIR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: N/A
Solicitation Number: PHS2006-2
Small Business Information
B & W TEK, INC.
B & W TEK, INC., 19 SHEA WAY, SUITE 301, NEWARK, DE, 19713
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 JACK ZHOU
 (302) 368-7824
 JZHOU@BWTEK.COM
Business Contact
Phone: (302) 368-7824
Research Institution
N/A
Abstract
DESCRIPTION (provided by applicant): LED based curing lights are beginning to replace conventional halogen lamps as the first choice for dental photo-curing applications. The target of this proposal is to develop a new generation LED dental curing light. It will be the first curing light that is optimized according to the kinetic response of the dental composite, which plays a key role in determining the curing time, the quality of the cured resin, and the heat production. The proposed LED light cures the dental composite by a train of short-duration light pulses, where the time scale of the pulse width and pulse period is designed to match with the response time of the photo-initiation process. This 'resonant' curing mode yields the best quantum efficiency for photo-polymerization. Phase I study of this project leads to successful demonstration of the feasibility and advantages of the proposed pulsed LED light over conventional light curing units (LCUs). It was found that the pulsed LED light yields 10-12% more curing depth and better surface hardness than that obtained by a continuous wave (CW) light with same exposure energy. For phase II project, we will establish a simple but practical model to analyze the kinetic characteristics of the photo-polymerization process and use the model as a guide to help us further explore the potential of the pulsed LED light for dental composite curing. A Raman spectrometer will be utilized in combination with the pulsed LED for real time and in situ monitoring of the photo-polymerization process as to obtain the parameters used in the kinetic model. We will conduct a systematic study on the physical properties of the dental composite cured by both conventional LCUs and the proposed pulsed LED, which will be used to further optimize the pulse sequence. A novel automatic curing time control method employing fluorescence level monitoring at off-time of the pulse train will also be explored. Finally, we will develop a prototype pulsed LED photo-curing system capable of curing all dental polymer resins currently on the market in a time scale comparable to that can be obtained using laser radiation (typically 5-10 seconds) and with a high "quality" of cure in terms of depth of cure, hardness, shrinkage, shear bond strength, and temperature change in the resin.

* information listed above is at the time of submission.

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