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. 2016 Nov 25;8(11):3289-3295.
doi: 10.19082/3289. eCollection 2016 Nov.

Evaluating the Microshear Bond Strength and Microleakage of Flowable Composites Containing Zinc Oxide Nano-particles

Koorosh Teymoornezhad  1 , Homayoun Alaghehmand  2 , Ghazaleh Daryakenari  3 , Soraya Khafri  4 , Mitra Tabari  5
Affiliations

Evaluating the Microshear Bond Strength and Microleakage of Flowable Composites Containing Zinc Oxide Nano-particles

Koorosh Teymoornezhad et al. Electron Physician. .

Abstract

Introduction: Preventive resin restorations (PRR) are the conservative choice for the most common carious lesions in children. Thus, new age flowable resin composites with higher filler content are readily used. The aim of this study was to evaluate the microshear bond strength and microleakage of two flowable resin composites containing different percentages of nano zinc oxide (NZnO) particles, which have proven to have antimicrobial properties.

Methods: This experimental in-vitro study was carried out in the Dental Material Research Center of Babol University of Medical Sciences in 2015. One nanohybrid and one nanofill flowable resin composite were chosen and modified with the incorporation of 1% and 3% Wt NZnO particles. Six groups (n=10, 0%, 1%, and 3%) of resin composite sticks on dental enamel (2×2mm) were prepared to be placed in the microtensile tester. The microshear bond strength magnitude (MPa) was recorded at the point of failure. A class I box (3×0.8×1 mm) was prepared on 60 premolars and filled using the resin composites (6 groups, n=10). The specimens were immersed in a 5% basic fuschin solution and sectioned bucco-lingually to view the microleakage using a stereomicroscope. One-way ANOVA and Tukey tests for microshear and Wilcoxon and Kruskal-Wallis tests for microleakage were used to analyze the data in the IBM SPSS Statistics version 22 software.

Results: The bond strength of the 3% clearfill group significantly decreased while no significant change occurred in the bond strength in other groups. The Z-350 group had significantly lower microleakage as nanoparticles increased. No significant difference was observed in the clearfill group.

Conclusion: Up to 3% Wt incorporation of NZnO particles will not diversely alter the bond strength, but it will be beneficial in providing antimicrobial effects with lower microleakage rates.

Keywords: Dental leakage; Flowable composite; Nanoparticles; Shear strength; Zinc oxide.

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Conflict of interest statement

There is no conflict of interest to be declared.

Figures

Figure 1
Figure 1
EDAX view showing the homogenous diffusion of NZnO particles, A: 3% Z-350, B: 3% clearfill, C: 1% Z-350, D: 1% clearfill
See this image and copyright information in PMC

References

    1. JR P. missouri, editor, editor. Pediatric dentistry infancy trough adolescence. 5th ed. Elsevier; 2013. p. 469.
    1. Fuks AB, Grajover R, Eidelman E. Assessment of marginal leakage of class II amalgam-sealant restorations. ASDC j dent child. 1986;53(5):343–5. - PubMed
    1. McComb D. Systematic review of conservative operative caries management strategies. J dent educ. 2001;65(10):1154–61. - PubMed
    1. Peumans M, Kanumilli P, De Munck J, Van Landuyt K, Lambrechts P, Van Meerbeek B, et al. Clinical effectiveness of contemporary adhesives: a systematic review of current clinical trials. Dent mater. 2005;21(9):864–81. doi: 10.1016/j.dental.2005.02.003. - DOI - PubMed
    1. Simonsen RJ. Preventive resin restorations and sealants in light of current evidence. Dent clin North Am. 2005;49(4):815–23. - PubMed

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