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Background and Aim: The light-cured composites and other restorative materials are quite common in dentistry today. Successful restorations are dependent on the efficiency of the light-curing unit, the intensity of light, and its wavelength. This study evaluated the efficacy of LED light-curing units in private dental clinics in Tehran.
Materials and Methods: In this descriptive cross-sectional study, 320 light-curing devices in different private dental clinics were randomly evaluated. The radiometer (light-testing-meter) measured Light intensity, and also dust on the fan and cracks or scratches on the filter were directly observed. Moreover, the age of the device, the frequency of changing the bulbs and satisfaction of the dentist concerning the light-curing unit were recorded in questionnaires. Data were analyzed for Spearman correlation and t-test using SPSS software with p<0.05 as the level of significance.
Results: The results showed that the intensity of 53.75% units was more than 300 mW/cm2. The power of 30.3% of curing light units was between 200 and 300 mW/cm2, and 15.9% had lower than200 mW/cm2. The light intensity has a negative relation with the age of the unit, frequency of bulb changing, and scratches on the filter and dust on the fan.
Conclusion: The results proved that the light intensity of about 46% of light-curing units, used in private dental practices and clinics, were inadequate. Since factors such as ageing of the light-curing devices, frequency of bulb replacement, increasing the amount of dust on the fan and scratches on the filter reduces the light intensity; therefore, regular quality control of these devices is necessary.
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