IADR Abstract Archives

Delivered Irradiance as a function of LCU-Tip to Restoration Surface

Objectives: To quantify the delivered irradiance as a function of distance of the light curing unit (LCU) tip from the restoration surface and different LCUs. Methods: Six LCUs, bluephase-20i, bluephase-G2, bluephase-style (Ivoclar-Vivadent); freelight2, EliparS10 (3MESPE); VALO (Ultradent), were individually mounted on a MARC - Resin Calibrator™ and centred perpendicularly over the sensor. The distance between the LCU tip and the sensor was increased from 0.00mm initially in 1.00mm increments up to a distance of 10.00mm. At each distance, the LCU was activated for 10 seconds and the energy per unit area (mW/cm2) delivered to the sensor recorded. Results: Table1. Irradiance of all six LCUs decreased as a function of distance. bluephase G2 had the least variance over distance (0.00 to 10.00mm). 3M ESPE LCUs showed a wide divergent beam with a 73-82% loss in irradiance over 10mm, similar to the bluephase20i with turbo tip. Conclusions: Reporting a single irradiance value or a single energy spectral range to describe the output from a curing light is both imprecise and inappropriate. LCU manufacturers should indicate irradiance values delivered at different clinically relevant T-S distances. Information of both the irradiance distribution, and the distribution of the spectral emission across the light tip should be provided. Recommendations for curing times for different clinical T-S distances should be given by manufacturers of RBCs.

Table 1. The Change in Irradiance^* with T-S distance (0 – 10mm) and the overall % Changes in Irradiance from 0.00mm to 10.00mm.

	bluephase G2	bluephase 20i (turbo tip)	bluephase style	freelight2	Elipar S10	VALO standard	VALO high	VALO plasma
manufacturer irradiance	1200 (+/- 5%)	2000 (+/- 5%)	1100 (+/- 5%)	1000 (+/- 5%)	1200 (+/- 5%)	1000 (+/- 5%)	1400 (+/- 5%)	3200 (+/- 5%)
irradiance at 0 mm	1200.3[19.7]	1855.8[33.6]	1255.5[23.0	1676.5[55.4]	2141.8[20.7]	1343.5[29.9]	1974.5[41.9]	3479.5[58.3]
irradiance at 1 mm	1227.8[28.7]	1723.8[63.2]	1283.3[39.2]	1572.8[22.5]	2041.5[38.1]	1388.2[48.8]	2080.5[20.9]	3515.5[91.3]
Irradiance change from 0-1.00 (%)	+2.3%	-7.1%	+2.2%	-6.2%	-4.7%	+3.3%	+5.4%	+1%
irradiance at 2 mm	1287.0[49.9	1533.3[50.6]	1365.1[66.1]	1391.1[30.2]	1886.2[40.8]	1466.3[37.1]	2120.3[52.3]	3516.3[193.0]
Irradiance change from 0-2.00 (%)	+7.2%	-17.4%	+8.7%	-17%	-11.9%	+9.1%	+7.4%	+1%
irradiance at 3 mm	1347.2[38.8]	1303.3[40.9]	1408.5[48.6]	1167.0[66.9]	1682.0[36.9	1372.2[44.9]	1980.0[28.1]	3280.8[128.8
Irradiance change from 0-3.00 (%)	+12.2%	-29.8%	+12.2%	-30.4%	-21.5%	+2.1%	+ 30.3%	-5.7%
irradiance at 4 mm	1392.5[30.3]	1087.2[53.3]	1362.5[37.9]	943.5[58.3]	1430.0[47.6]	1163.3[33.8]	1696.8[41.3]	2928.3[207.3]
Irradiance change from 0-4.00 (%)	+16%	-41.3%	+8.5%	-43.7%	-33.2%	-13.4%	-14.1%	-15.8%
*irradiance at 6 mm*	*1395.8[45.3]*	*723.0[33.7]*	*1066.0[73.6]*	*614.3[42.2]*	*992.5[32.8]*	*848.5[18.1]*	*1250.2[15.1]*	*2200.0[184.6]*
Irradiance change from 0-6.00 (%)	+16.3%	-61%	-15.1%	-63.4%	-53.7%	-36.8%	-36.7%	-36.8%
*irradiance at 8 mm*	*1225.2[34.1]*	*466.0[22.6]*	*754.5[55.6]*	*422.00[24.3]*	*721.8[30.8]*	*677.0[20.6]*	*1000.3[17.1]*	*1764.8[145.6]*
Irradiance change from 0-8.00 (%)	+2.1%	-74.9%	-39.9%	-74.8%	-66.3%	-49.6%	-49.3%	-49.3%
irradiance at 10 mm	976.5[26.3]	319.0[10.9]	542.0[43.5]	300.3[17.00]	565.8[23.3]	567.5[13.2	836.3[9.8]	1468.8[106.6]
Irradiance change from 0-10 (%)	*-18.6%*	*-82.8%*	*-56.8%*	*-82.1%*	*-73.6%*	*-57.8%*	*-57.6%*	*-57.8%*

Division: Pan European Region Meeting
Meeting: 2014 Pan European Region Meeting (Dubrovnik, Croatia)
Location: Dubrovnik, Croatia
Year: 2014
Final Presentation ID: 580
Abstract Category|Abstract Category(s): Scientific Groups

Authors

Almuallem, Zahra ( THE UNIVERSITY OF EDINBURGH, EDINBURGH, , Scotland )

Santini, Ario ( THE UNIVERSITY OF EDINBURGH, EDINBURGH, , Scotland )

SESSION INFORMATION

Oral Session
Light-curing and Endodontology
09/13/2014