IADR Abstract Archives
Effect of Curing Light and Restoration Location on Energy Delivery
Objectives: This study determined how long it would take skilled operators to deliver 16J/cm2 to an anterior or a posterior restoration using different light curing units (LCUs).
Methods: Two skilled operators used the following LCUs at two locations in the MARC-patient simulator(BlueLight analytics):Optilux 501(Kerr) standard mode for 20s, Sapphire(Den-Mat) for 5 s, Elipar S10(3M ESPE) for 5s and 20 s, DemiPlus(Kerr) standard mode for 5s, SmartLite Max (Dentsply) boost mode for 5s and continuous mode for 20s, RadiiPlus(SDI) for 30 s, Valo(Ultradent) Mains in standard mode for 20s and plasma mode for 3s, Valo Cordless in standard mode for 20s and plasma mode for 3s. The two MARC-trained operators made thirty readings with each light over seven days. The energy (J/cm2) delivered to the anterior Class III and Posterior Class I simulated restorations in MARC was recorded using a laboratory grade spectroradiometer and the time each light would take to deliver 16J/cm2 calculated. ANOVA and Fisher's PLSD tests compared differences in the time to deliver 16J/cm2 of energy, α=0.05.
Results: Three-way ANOVA showed there was no significant difference between the operators, but there was a difference between the lights and locations. The Valo Mains and Valo Cordless in the plasma mode delivered 16J/cm2 in the shortest time at both locations. The Radii Plus took the longest to deliver 16J/cm2, taking twice as long in the posterior location.
| Anterior: 1mm Deep Class III
| Posterior: 4 mm Deep Class I
| ||
Curing Light, Mode and Time
| Mean Time (s) to Deliver 16J/cm2
| S.D. (s)
| Mean Time (s) to Deliver 16J/cm2
| S.D. (s)
|
VALO C, plasma 3s | 5 A
| 0.3
| 6 F
| 0.3
|
VALO M, plasma 3s
| 6 A
| 0.3
| 6 F
| 0.5
|
Sapphire, std. 5s
| 9 B
| 0.2
| 9
| 0.7
|
Demi Plus, std. 5s
| 9 B, C
| 0.6
| 12 G
| 1.0
|
Elipar S10, std.20s
| 10 C
| 1.2
| 11 G
| 0.6
|
Elipar S10, std. 5s
| 10 C
| 1.3
| 12 G
| 1.3
|
SmartLiteMax, boost 5s
| 11 D
| 1.5
| 19
| 3.1
|
Optilux 501, std. 20s
| 12 D
| 1.1
| 15
| 1.6
|
VALO C, std. 20s
| 12 D
| 0.8
| 13 H
| 0.7
|
VALO M, std. 20s
| 14 E
| 0.8
| 13 H
| 0.5
|
SmartLite Max, cont. 20s
| 14 E
| 1.9
| 25
| 5.6
|
Radii Plus, std. 30s
| 14 E
| 2.4
| 28
| 2.4
|
Values in each column not significantly different indicated by superscript letter: Fisher's PLSD α=0.05
Conclusions: Depending on the location of the restoration, some curing lights can take twice as long to deliver the same amount of energy. Manufacturers of some LCUs could help clinicians to deliver the energy required to cure the selected resin by adjusting the curing times depending on the location and distance to the resin.
Dalhousie and Tufts Universities supported this research.