Objectives: To compare the photo-polymerizing efficiency of a high-intensity, short-exposure, dental LED light-curing unit (FlashMax P3, CMS Dental) with six newest commercial LED LCUs. Methods: Seven LCUs (3 per brand, n = 21) were studied. The LCU irradiances, radiant exposures as a function of vertical & lateral distances along with spectral wavelength distribution, and the temperature rise produced from the radiant emission were measured respectively using a thermopile power-meter (10A-V1.1, Ophir), a MARC® Resin Calibrator (Blue-Light Analytics Inc.), and a thermocouple probe (OMEGA® DP41) placed 2 mm away from the light-tip center. Photo-polymerizing efficiency was assessed through micro-hardness profiling of a hybrid resin-composite, FiltekTM Z250 (3M-ESPE): three disc-specimens (ø 6 mm x h 2 mm) for each combination of LCU brands and two different source-to-target distances (2 mm & 8 mm) were prepared and stored dry at 37 C for 24 h prior to testing; then, Knoop hardness was measured using a micro-hardness tester (Buehler Micromet 5100). A one-way ANOVA/Tukey was performed per specific measurement (α = 0.05). Results: Significant differences were found between LCU brands per specific measurement (See Table 1). Conclusions: FlashMax P3 demonstrated the highest irradiance and radiant heat but the lowest significant Knoop hardness at the 8 mm source-to-target distance as compared to the other LCUs listed in Table 1.
Division: IADR/AADR/CADR General Session
Meeting:2015 IADR/AADR/CADR General Session (Boston, Massachusetts) Location: Boston, Massachusetts
Year: 2015 Final Presentation ID:2307 Abstract Category|Abstract Category(s):Dental Materials 10: Instruments and Equipment
Authors
Lien, Wen
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Dunn, William
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Risk, Douglas
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Mack, Kelli
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Galvin, Marissa
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Flores, Katherine
( USAF (Dental Evaluation & Consultation Service)
, San Antonio (Ft. Sam Houston)
, Texas
, United States
)
Financial Interest Disclosure: NONE
SESSION INFORMATION
Poster Session
Instruments and Equipment IV
Friday,
03/13/2015
, 03:30PM - 04:45PM
TABLES
Dental LCUs Performance
Brand
Bluephase Style
Demi Ultra
Elipar S10
FlashMax P3
Paradigm
SmartLite
SPEC 3
Testing Properties
Average
SD
Average
SD
Average
SD
Average
SD
Average
SD
Average
SD
Average
SD
Irradiance (mW/cm^2)
860.1
11.0
732.9
14.2
921.4
18.4
3697.3
164.8
934.8
11.9
1174.4
33.9
1565.3
50.7
% Irradiance Reduction (0-10mm)
53.5%
8.1%
71.1%
1.4%
68.1%
1.5%
85.0%
1.3%
69.4%
1.2%
28.1%
9.5%
90.0%
2.1%
KH (Bottom Disc Surface, Source-to-Target 2mm)
61.2
2.7
a
70.4
1.0
d
65.7
1.6
b
60.3
1.8
a
69.4
0.5
cd
64.3
1.4
b
66.9
1.0
bc
KH (Bottom Disc Surface, Source-to-Target 8mm)
59.6
1.2
b
71.1
0.6
e
62.7
1.0
c
54.6
0.5
a
68.6
1.4
d
61.9
0.6
c
58.1
0.6
b
Radiant Heat (°C)
33.0
0.4
c
36.3
0.9
b
36.3
1.3
b
40.2
1.1
a
37.0
0.2
b
30.1
0.2
d
40.5
0.7
a
Groups with the same lower case letter per row are not significantly different (p > 0.05)