Changes in irradiance and energy density in relation to different curing distances

Area of Science:

• Dental Materials Science
• Photopolymerization Technology

Background:

• Dental curing lights are essential for polymerizing light-curable resins.
• Understanding factors affecting curing efficiency, such as distance, is crucial for optimal clinical outcomes.

Purpose of the Study:

• To evaluate the effect of curing distance on the irradiance and power density of four different dental curing light devices.
• To determine the time required to achieve a specific energy density (16 J/cm²) at varying distances.

Main Methods:

• Four dental curing light devices (Valo, Elipar 2, Radii-Cal, Optilux-401) were tested at three distances (0 mm, 4 mm, 8 mm).
• Power density was measured using a MARC simulator, with ten measurements per device per distance.
• Energy delivered and time to reach 16 J/cm² were calculated and statistically analyzed.

Main Results:

• Curing distance significantly reduced power density for all devices, with greater distances yielding lower power.
• Increased distance led to longer curing times required to achieve the target energy density of 16 J/cm².
• The Valo device, particularly in extra power mode, consistently outperformed other devices in power density and efficiency across all distances.

Conclusions:

• All tested curing lights experienced significant loss of irradiance and energy when used at greater distances.
• The Valo device in extra power mode is the most effective, providing the highest power density and shortest curing time regardless of distance.