Depth of cure of sealants polymerized with high-power light emitting diode curing lights

作者：Kitchens Brandon; Wells Martha^*; Tantbirojn Daranee; Versluis Antheunis

来源：International Journal of Paediatric Dentistry, 2015, 25(2): 79-86.

DOI：10.1111/ipd.12102

ObjectiveTo determine whether recommended short curing times of three high-power light emitting diode (LED) curing lights are sufficient to polymerize sealant materials.
MethodsOpaque-unfilled sealant (Delton LC Opaque), opaque-filled sealant (UltraSeal XT plus), and clear-filled sealant (FluroShield) were light cured in a covered slot-mold using the manufacturers' shortest recommended curing times with three high-power LED lights (3-s VALO, 5-s Fusion, 10-s Smartlite). A 40-s cure with a quartz-tungsten halogen (QTH) light was used as control. Vickers hardness was measured 24h after curing at the sealant surface and through the depth (0.5mm increments) (N=10). Results were analyzed with two-way anova (pair-wise multiple comparisons, significance level 0.05).
ResultsThe high-power LEDs did not cure the sealants as deep as the QTH. Delton LC Opaque showed the least depth of cure as hardness values beyond a depth of 0.5mm were not measurable regardless of the curing light. Even for UltraSeal XT plus, when surface hardness was about the same with all lights, hardness decreased more rapidly with depth for the LEDs. FluroShield showed the slowest decline in hardness through the depth for all lights.
ConclusionsManufacturers' recommendations for shortest possible curing time with high-power LEDs were not sufficient for adequate polymerization of the tested sealants.

• 出版日期2015-3