Abstract
Background and AimOne of the most important problems with composite restorations is the loss of consistency between the composite and tooth color. The present study aimed to compare the color stability of two types of nanohybrid composites cured with different light-curing devices after aging.Materials and MethodsIn this study, the color stability of 40 disc-shaped specimens (10 mm in diameter and 2 mm in height) from two types of enamel and dentin nanohybrid composites (IPS Empress Direct, Ivoclar Vivadent) was investigated. A group of 10 samples of each composite was cured by light-emitting diode (LED) Bluephase device (Ivoclar, Vivadent) at 1200 mW/cm2 for 20 seconds, and another group of 10 specimens was cured by a quartz-tungsten-halogen (QTH) device (Coltolux 2.5, Colten, USA) at 600 mW/cm2 for 40 seconds. The initial color of the samples was determined by the Konica Minolta spectrophotometer (CS2000, USA), and then, the composite samples were subjected to an accelerated artificial aging (AAA) process in the QUV/SPRAY device. Then, the color of the samples was reassessed. Two-way analysis of variance (ANOVA) was used to compare the color changes in the study groups at a significance level of P=0.05.ResultsThe specimens cured by the LED device showed significantly lower color change compared to QTH (P=0.047). However, there was no significant difference in color stability between enamel and dentin composites cured by a fixed apparatus (P=0.474).ConclusionThe curing of nanohybrid composites with LED devices causes lower color change compared to QTH.
Highlights
In recent years, the use of composite restorations As a result, the most important advanhas increased due to the increasing demand for tage of composites, which is the provicosmetic treatments, the ease of bonding processes, the improvement of composite properties, and the advancement in their fabrication.[1]
There was a significant difference in color change between the samples cured by light-emitting diode (LED) and QTH devices as the samples cured by the LED device showed less color change (P=0.047)
The results showed that the use of the LED device improves color stability compared to the QTH device
Summary
The use of composite restorations As a result, the most important advanhas increased due to the increasing demand for tage of composites, which is the provicosmetic treatments, the ease of bonding processes, the improvement of composite properties, and the advancement in their fabrication.[1] One of the most important problems with composite restorations is the loss of consistency between the composite and tooth color over time. Internal factors include composite resin composition such as monomer chemistry, filler composition, filler type, initiators, and inhibitors.[3] One of the most important factors affecting the color stability of composite resins is the amount of composite polymerization. The type of lightcuring device is one of the most important factors affecting the composite polymerization rate.[4] The widespread use of composites has led to the advancement of light-curing devices and the supply of more efficient devices. Due to the longer life of LED devices, lower power consumption, no need for regular lamp replacement, and ease of use, the general tendency to use them is increasing, and quartz-tungsten-halogen (QTH) devices are replacing LED devices.[6]
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