TY  - JOUR
AU  - Santini, Ario
AU  - Miletić, Vesna
AU  - Swift, Michael D.
AU  - Bradley, Mark
PY  - 2012
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1734
AB  - Objectives: To determine the degree of conversion (DC) and Knoop microhardness (KHN) of resin-based composites (RBCs) containing trimethylbenzoyl-diphenylphosphine oxide (TPO) cured by polywave or monowave LED light-curing units (LCUs). Methods: Three groups (each n = 5) of Tetric EvoCeram (Ivoclar Vivadent), Vit-l-escence (Ultradent) and Herculite XRV Ultra (Kerr) were prepared in Teflon moulds (5 mm in diameter and 2 mm thick) and cured with polywave Bluephase (R) G2 (Ivoclar Vivadent), polywave Valo (Ultradent) or monowave Bluephase (R) (Ivoclar Vivadent; control) resulting in 9 groups. DC and KHN were determined using micro-Raman spectroscopy and Knoop microhardness, respectively. High-performance liquid chromatography and nuclear magnetic resonance spectroscopy were used to confirm the presence or absence of TPO in the three uncured materials. Data were statistically analysed using two-way and one-way ANOVA and DC and KHN were correlated using Pearson's correlation (alpha = 0.05). Results: TPO was confirmed in Tetric EvoCeram and Vit-l-escence but not in Herculite XRV Ultra. All three LCUs produced comparable KHN for Tetric EvoCeram and Herculite XRV Ultra (p > 0.05). Both polywave LCUs resulted in significantly higher KHN for Vit-l-escence and higher DC in Tetric EvoCeram and Vit-l-escence than the monowave Bluephase (R) (p  lt  0.05). Conversely, Bluephase (R) showed higher DC than the two polywave LCUs in Herculite XRV Ultra (p  lt  0.05). Pearson's correlation coefficient was r = 0.818. Conclusions: Polywave LED LCUs improved monomer to polymer conversion and KHN in the two TPO-containing RBCs, but not in Herculite XRV Ultra. DC and KHN were linearly correlated in all three RBCs. Vit-l-escence showed the highest DC and KHN of the three materials tested. Clinical significance: The use of polywave LEDs significantly improves both the DC and KHN of materials which contain TPO. This should be taken into account when curing bleached shades of RBCs even if the manufacturers do not indicate the presence of TPO in their materials.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of Dentistry
T1  - Degree of conversion and microhardness of TPO-containing resin-based composites cured by polywave and monowave LED units
VL  - 40
IS  - 7
SP  - 577
EP  - 584
DO  - 10.1016/j.jdent.2012.03.007
ER  - 

@article{
author = "Santini, Ario and Miletić, Vesna and Swift, Michael D. and Bradley, Mark",
year = "2012",
abstract = "Objectives: To determine the degree of conversion (DC) and Knoop microhardness (KHN) of resin-based composites (RBCs) containing trimethylbenzoyl-diphenylphosphine oxide (TPO) cured by polywave or monowave LED light-curing units (LCUs). Methods: Three groups (each n = 5) of Tetric EvoCeram (Ivoclar Vivadent), Vit-l-escence (Ultradent) and Herculite XRV Ultra (Kerr) were prepared in Teflon moulds (5 mm in diameter and 2 mm thick) and cured with polywave Bluephase (R) G2 (Ivoclar Vivadent), polywave Valo (Ultradent) or monowave Bluephase (R) (Ivoclar Vivadent; control) resulting in 9 groups. DC and KHN were determined using micro-Raman spectroscopy and Knoop microhardness, respectively. High-performance liquid chromatography and nuclear magnetic resonance spectroscopy were used to confirm the presence or absence of TPO in the three uncured materials. Data were statistically analysed using two-way and one-way ANOVA and DC and KHN were correlated using Pearson's correlation (alpha = 0.05). Results: TPO was confirmed in Tetric EvoCeram and Vit-l-escence but not in Herculite XRV Ultra. All three LCUs produced comparable KHN for Tetric EvoCeram and Herculite XRV Ultra (p > 0.05). Both polywave LCUs resulted in significantly higher KHN for Vit-l-escence and higher DC in Tetric EvoCeram and Vit-l-escence than the monowave Bluephase (R) (p  lt  0.05). Conversely, Bluephase (R) showed higher DC than the two polywave LCUs in Herculite XRV Ultra (p  lt  0.05). Pearson's correlation coefficient was r = 0.818. Conclusions: Polywave LED LCUs improved monomer to polymer conversion and KHN in the two TPO-containing RBCs, but not in Herculite XRV Ultra. DC and KHN were linearly correlated in all three RBCs. Vit-l-escence showed the highest DC and KHN of the three materials tested. Clinical significance: The use of polywave LEDs significantly improves both the DC and KHN of materials which contain TPO. This should be taken into account when curing bleached shades of RBCs even if the manufacturers do not indicate the presence of TPO in their materials.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of Dentistry",
title = "Degree of conversion and microhardness of TPO-containing resin-based composites cured by polywave and monowave LED units",
volume = "40",
number = "7",
pages = "577-584",
doi = "10.1016/j.jdent.2012.03.007"
}

Santini, A., Miletić, V., Swift, M. D.,& Bradley, M.. (2012). Degree of conversion and microhardness of TPO-containing resin-based composites cured by polywave and monowave LED units. in Journal of Dentistry
Elsevier Sci Ltd, Oxford., 40(7), 577-584.
https://doi.org/10.1016/j.jdent.2012.03.007

Santini A, Miletić V, Swift MD, Bradley M. Degree of conversion and microhardness of TPO-containing resin-based composites cured by polywave and monowave LED units. in Journal of Dentistry. 2012;40(7):577-584.
doi:10.1016/j.jdent.2012.03.007 .

Santini, Ario, Miletić, Vesna, Swift, Michael D., Bradley, Mark, "Degree of conversion and microhardness of TPO-containing resin-based composites cured by polywave and monowave LED units" in Journal of Dentistry, 40, no. 7 (2012):577-584,
https://doi.org/10.1016/j.jdent.2012.03.007 . .