312 Usage Effect on Irradiance and Radiant Exposure from VALO® LED

Thursday, March 20, 2014: 2 p.m. - 3:15 p.m.
Location: Exhibit Hall AB (Charlotte Convention Center)
Presentation Type: Poster Session
Track: Clinician Track
W. KEY1, A. KIOUS1, W.W. BRACKETT2, R.B. PRICE3, and F.A. RUEGGEBERG4, 1College of Dental Medicine, Augusta, GA, 2Georgia Regents University, College of Dental Medicine, Augusta, GA, 3Dalhousie University, Halifax, NS, Canada, 4Georgia Regents University, Augusta, GA


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.

Student Presenter

Keywords: Curing lights and usage effect
Presenting author's disclosure statement:

I have a significant financial interest/arrangement or affiliation with an organization/institution whose products or services are being discussed in this session. I understand that I must disclose this information to the participants who attend my presentation. No
I have read the IADR policy on licensing.
Signed on 10/01/2013 by W. KEY