Restor Dent Endod.  2022 Feb;47(1):e9. 10.5395/rde.2022.47.e9.

Effects of 3 different light-curing units on the physico-mechanical properties of bleach-shade resin composites

• Farzad A
• Kasraei S
• Haghi S
• Masoumbeigi M
• Torabzadeh H
• Panahandeh N

• KMID: 2548118
• DOI: http://doi.org/10.5395/rde.2022.47.e9

Abstract

Objectives
This study investigated the microhardness, flexural strength, and color stability of bleach-shade resin composites cured with 3 different light-curing units.
Materials and Methods
In this in vitro experimental study, 270 samples were fabricated of bleach and A2 shades of 3 commercial resin composites (Point 4, G-aenial Anterior, and Estelite Sigma Quick). Samples (n = 5 for each trial) were cured with Bluephase N, Woodpecker LED.D, and Optilux 501 units and underwent Vickers microhardness and flexural strength tests. The samples were tested after 24 hours of storage in distilled water. Color was assessed using a spectrophotometer immediately after preparation and 24 hours after curing. Data were analyzed using 3-way analysis of variance and the Tukey test (p ≤ 0.001).
Results
Samples cured with Optilux exhibited the highest and those cured with LED.D exhibited the lowest microhardness (p = 0.023). The bleach shade of Point 4 composite cured with Optilux displayed the highest flexural strength, while the same composite and shade cured with Sigma Quick exhibited the lowest (p ≤ 0.001). The color change after 24 hours was greatest for the bleach shade of G-aenial cured with Bluephase N and least for the A2 shade of Sigma Quick cured with Optilux (p ≤ 0.001).
Conclusions
Light curing with polywave light-emitting diode (LED) yielded results between or statistically similar to those of quartz-tungsten-halogen and monowave LED in the microhardness and flexural strength of both A2 and bleach shades of resin composites. However, the brands of light-curing devices showed significant differences in color stability.

Keyword

Bleach-shade resin composite; Color stability; Flexural strength; Light-curing unit; Microhardness

Figure

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  Figure 1 Spectral radiant power (mW/nm) of LED.D and Optilux 501 devices.Rel., relative; LED, light-emitting diode.

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  Figure 2 Spectral radiant power (mW/nm) of Bluephase N (blue line) compared with the absorption spectra of camphorquinone (yellow) and TPO (gray).Rel., relative; TPO, 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

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