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Effect of air, dentin and resin-based composite thickness on light intensity reduction
C Prati1, S Chersoni, L Montebugnoli
1Department of Emergency Dentistry, School of Dentistry, University of Bologna, Italy. prati@alma.unibo.it
Purpose:
To evaluate the effect of air, dentin and resin-based composite thickness on light intensity reduction.
Materials And Methods:
Two different light-units were used in the study. Light intensity was measured using a curing radiometer.
Results:
There was an exponential decrease in light intensity with distance. The light-intensity value at a specific distance from the tip during passage through a specific dental material was calculated. Both composite and dentin caused a dramatic reduction in light intensity rate, e.g. 2.0 mm of composite are sufficient to reduce the light-intensity to 6% of its initial value.