The effect of accelerated aging on the color stability and translucency of novel zirconia reinforced rice husk dental composite resin in different infusion media

Galvin Sim Siang Lin,Tahir Yusuf Noorani,Nik Rozainah Nik Abdul Ghani,Noor Huda Ismail

doi:10.4322/bds.2021.e3046

Galvin Sim Siang Lin, Tahir Yusuf Noorani + Show 2 more

Open Access

https://doi.org/10.4322/bds.2021.e3046

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Abstract

Objective: To compare the color stability and translucency of aged and unaged experimental zirconia reinforcedrice husk nanohybrid composite resin (Zr-Hybrid) with a commercialized nanofilled and a microhybrid compositeresin after immersion in four different infusion media. Material and Methods: Three groups of standardizeddisc-shaped composite resin with 80 samples per group were prepared as follow: Group 1 (Filtek-Z350-XT),Group 2 (Zmack-Comp), and Group 3 (Zr-Hybrid). Each group was further subdivided into aged (n=40) andunaged (n=40) groups. Initial color measurements were taken using a digital spectrophotometer based on CIEL*a*b* color system. Samples in aged subgroup were subjected to 2500 thermal cycles. Subsequently, all sampleswere immersed in four different types of infusion media (n=10): T1 - Distilled water, T2 - Soft drink, T3 - Teaand T4 - Coffee. After 15 days, color measurements of all samples were measured again. Data were analyzedusing two-way ANOVA followed by Bonferroni and paired sample t-tests with a significance level set at P=0.05.Results: Unaged Zr-Hybrid showed comparable color change to Zmack-Comp and Filtek-Z350-XT (P=0.181), butaged Zr-Hybrid demonstrated the lowest color change (P<0.001). Zr-Hybrid exhibited the lowest translucencyvalue (P<0.001), but no significant color and translucency changes (P=0.051 and P=0.069, respectively) wereobserved between unaged and aged Zr-Hybrid. Soft drink had the greatest effect (P<0.001) on color change, whilecoffee showed the greatest effect (P<0.001) on translucency. Conclusion: Although Zr-Hybrid showed greateropacity, it still retained its color stability and translucency after accelerated aging compared to commercializedmicrohybrid and nanofilled composite resins. All infusion media caused discoloration and affected the compositeresins’ translucency.KEYWORDSRice husk; Color stability; Composite resin; Translucency; Zirconia.

Highlights

Composite resins have become one of the most widely used dental restorative materials for decades
Since the esthetic value of a composite resin restoration is dependent on the ability to maintain its color and harmonize with natural teeth, the key element is to address the color stability and translucency [6,7,8]
No significant difference (P=0.181) in the color change was found among all unaged composite resins, but a significant color change (P=0.001) was noted among aged composite resins after being immersed in all fourinfusion media

Summary

Introduction

Composite resins have become one of the most widely used dental restorative materials for decades. Nanocomposites have been developed and introduced [1] The benefits of these new nanocomposites include better mechanical properties, improved fracture resistance, outstanding polish performance, minimal shrinkage, and optimal color stability [1,2]. Dental materials such as dental composite resins are continuously exposed to the oral environment and are susceptible to changes in their physical, mechanical, and optical properties. Discoloration is by far one of the most common causes of replacement for composite resin restoration, especially in anterior teeth [3,5].

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