Thursday, March 20, 2014: 2 p.m. - 3:15 p.m.
Location: Exhibit Hall AB (Charlotte Convention Center)
Presentation Type: Poster Session
Introduction: The checkMARC™ device (BlueLight Analytics Inc., Halifax, NS, Canada) is a NIST referenced calibrated device that measures the total power exiting from the light tip of a light curing unit (LCU) and the software used with this device performs an absolute irradiance (mW/cm2/nm) calculation and an average light tip irradiance (mW/cm2) based on the user entering the light tip diameter. Objective: The objective of this study was to determine the average irradiance output of 2 commercially available light-emitting diode (LED) LCUs with 13 quartz-tungsten-halogen (QTH) LCUs attached to dental chair units at the University of the State of Rio de Janeiro Dental School. Methods: Two LED LCUs LCU1(Elipar S10; 3MESPE, Seefeld, Germany) and LCU2(Elipar Freelight2; 3MESPE) and thirteen halogen lights (QHT1-13) attached to dental chairs (Dabi Atlante, Ribeirão Preto, SP, Brazil) were tested with the checkMARC™ device. Results were analyzed with ANOVA followed by Tukey HSD test (α=0.05). Results: Means and standard deviations of average irradiance output (mW/cm2) were LCU1(1204.08±81.33); LCU2(1016.60±81.33); QHT1(190.07±15.21); QHT2(220.89±17.67); QHT3(186.68±14.93); QHT4(185.68±14.85); QHT5(149.90±11.99); QHT6(165.70±13.26); QHT7(124.36±9.95); QHT8(149.68±11.97); QHT9(127.63±10.21); QHT10(108.86±8.71); QHT11(104.39±8.35); QHT12(61.40±4.91) and QHT13(74.56±5.96). There was a statistical significant difference between all LCUs. Elipar S10 exhibited the highest and QHT12 the lowest average irradiance output. There was a large variety of irradiance throughout all QHT LCUs. Conclusions: Within the limitations of this study, it can be concluded that 1) LED LCUs have a statistically significant higher irradiance output than QHT LCUs; 2) there is a large variation of irradiance outputs through different LCUs; 3) LCUs should be tested consistently and frequently for irradiance output to ensure proper curing of light-cured dental materials and 4) energy requirements of any resin-based composite should be checked to ensured proper use of LCUs.
Keywords: Curing lights, Polymerization and Prosthodontics
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 10/10/2013 by L. SALINA