To determine the effect of subjective ranking of light usage on irradiance and radiant exposure delivered from the VALO corded LED light curing unit (LCU).
The emission characteristics of 90 chair-mounted, corded LED curing lights (VALO, Ultradent Products, S. Jordan, UT, USA) at the College of Dental Medicine of Georgia Regents University were measured using a commercial, manikin-mounted, spectroradiometric analysis unit (MARC-PSTM, BlueLight Analytics, Halifax, NS, CA). Each light was measured three times in the Standard 10-s mode, and the average was taken as representative of that specific LCU. A customized holding matrix and careful positioning attention minimized measurement variation. LCUs were subjectively categorized into probable extent of usage, based on clinical location of the light: NEW, SLIGHT, LOW, MODERATE, HIGH. Parameters measured were total irradiance (360-540 nm), exposure duration (s), and radiant exposure within a specific wavelength range (irradiance times exposure duration): violet (360-420 nm, and blue 420-540 nm). Within a parameter, a 1-way rank-based ANOVA was performed. All statistical testing was performed at a pre-set alpha of 0.05.
The following table lists test results (median (inter-quartile difference)). Within a column, values with similar upper case letter are not significantly different.
No significant difference in irradiance was found related to usage. However NEW lights demonstrated significantly greater irradiance in the 360-420nm range. NEW lights also exposed for significantly longer than did the MEDIUM and HIGH groupings. No significant difference in radiant exposure in the 420-540nm range was found. The NEW lights emitted significantly more radiant exposure in the 360-420nm range than did all the other usage groups.
Overall LCU irradiance was not affected by subjective usage grouping. However a slight increase in exposure duration and violet irradiance from the NEW lights resulted in significantly greater violet radiant exposure than from the other, aged lights.
Keywords: Curing lights and usage effect
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Signed on 10/01/2013 by W. KEY
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