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Shortest exposure time possible with LED curing lights.

Inga Busemann¹, Claudia Lipke, Anke Schattenberg

¹Department for Operative Dentistry, University Medical Center, Johannes Gutenberg University Mainz, Augustusplatz 2, 55131 Mainz, Germany. Inga.Busemann@unimedizin-mainz.de

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Summary

The shortest effective curing time for resin composites using various light emitting diode (LED) devices varies by shade and device. Ten seconds is generally the minimum recommended exposure for lighter shades to ensure adequate polymerization.

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Area of Science:

Dental Materials Science
Polymer Chemistry
Biomaterials Engineering

Background:

Light emitting diode (LED) curing devices are standard in dental practice for polymerizing resin composites.
Optimizing LED curing time is crucial for achieving adequate material properties and clinical success.
Variability in LED device power and resin composite shades necessitates specific exposure time investigations.

Purpose of the Study:

To determine the minimum exposure times for various LED curing devices to achieve adequate polymerization of different resin composite shades.
To evaluate the performance of nine different LED curing devices under simulated clinical conditions.
To establish clinically acceptable curing parameters for resin composites.

Main Methods:

Nine LED curing devices were tested with two resin composites (Tetric EvoCeram and Filtek Supreme XT) in five shades (A1-A4).
Samples were polymerized in increments under simulated Class II conditions, with light guides positioned 7mm from the base.
Bottom surface hardness was measured, and a ratio of 80% of reference hardness defined acceptable curing.

Main Results:

Minimal exposure times varied significantly between devices and shades, ranging from 5 to 30 seconds.
Devices like Bluephase 20i (high power and turbo modes) and Elipar S10 demonstrated efficient polymerization, often achieving acceptable hardness in 5-10 seconds for lighter shades.
Longer exposure times were required for darker shades (A3.5, A4) and certain device/composite combinations.

Conclusions:

The shortest effective LED curing time is dependent on the specific curing device, resin composite shade, and material.
A minimum of 10 seconds is recommended for lighter shades under optimal conditions.
Clinicians should be aware of device-specific parameters to ensure complete resin composite polymerization.