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The effect of distance from light source on light intensity from curing lights
Corey A Felix1, Richard B T Price
1Department of Dental Clinical Sciences, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada.
The Journal of Adhesive Dentistry
|March 11, 2004
Summary
Light intensity significantly decreases with distance from curing light guides, especially with turbo types. This reduction varies between devices, making predictions unreliable and necessitating manufacturer-provided data for clinical distances.
Area of Science:
- Dental Materials Science
- Photopolymerization Technology
- Biomedical Optics
Background:
- Dental curing lights are essential for polymerizing restorative materials.
- Accurate light delivery is critical for effective polymerization.
- Understanding light intensity decay with distance is crucial for clinical success.
Purpose of the Study:
- To quantify the reduction in light intensity as distance from the curing light guide tip increases.
- To compare the light intensity decay patterns among different curing light and light guide combinations.
- To evaluate the predictability of light intensity at clinically relevant distances.
Main Methods:
- Ten distinct curing light/light guide systems were evaluated.
- Light intensity was measured using a radiometer at distances of 0, 3, 6, and 10 mm.
- Measurements were replicated across five trials to determine mean intensity and standard deviation.
- Fiber density and light dispersion patterns were also analyzed.
Main Results:
- A consistent decrease in light intensity was observed with increasing distance for all tested systems.
- The rate and magnitude of intensity reduction varied significantly among the different curing lights (p < 0.0001).
- Turbo light guides demonstrated a more pronounced intensity drop compared to standard guides, losing over 80% intensity at 10 mm.
Conclusions:
- The decay rate of light intensity with distance is not uniform across all dental curing lights.
- Predicting light intensity at 10 mm based solely on measurements at 0 mm is not feasible.
- Manufacturers should provide light intensity data for clinically relevant distances (0-10 mm).