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Composite conversion and temperature rise using a conventional, plasma arc, and an experimental blue LED curing unit.

Z Tarle¹, A Meniga, A Knezević

¹Department of Restorative Dentistry, School of Dental Medicine, University of Zagreb, Zagreb, Croatia. andrej.meniga@zg.tel.hr

Journal of Oral Rehabilitation

|August 3, 2002

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This study compared blue light emitting diodes (LEDs) and plasma light for dental composite curing. While conventional curing yielded higher conversion, blue LEDs and plasma light produced less heat, with LEDs requiring much lower intensity.

Area of Science:

Dental Materials Science
Polymer Chemistry
Biomedical Engineering

Background:

Photopolymerization is crucial for dental composite restoration.
Traditional light sources and newer plasma technologies have limitations.
Investigating novel light sources like blue LEDs is essential for optimizing dental curing.

Purpose of the Study:

To evaluate the degree of conversion and temperature rise in composite materials using blue superbright light emitting diodes (LEDs).
To compare the performance of blue LEDs against plasma light and a traditional photopolymerization unit.
To analyze the relationship between light intensity, spectral distribution, and photopolymerization efficiency.

Main Methods:

Utilized Fourier transform infrared (FTIR) spectroscopy to measure the degree of conversion.

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Employed a digital multimeter to record temperature rise during polymerization.

Compared three composite materials under experimental blue LEDs, plasma light, and a conventional unit.

Main Results:

Conventional curing resulted in significantly higher degree of conversion values.
Blue LEDs and plasma light generated significantly lower temperature rises compared to the conventional unit.
Blue LEDs operated at a much lower intensity (9 mW cm-2) than plasma light (1370 mW cm-2) and the conventional unit (560 mW cm-2).

Conclusions:

Blue LEDs offer a promising alternative for dental composite photopolymerization due to lower heat generation.
The spectral match between blue LEDs and camphorquinone (CQ) likely explains their efficiency at lower intensities.
Further research is warranted to optimize blue LED technology for clinical dental applications.