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KMID : 1034420200450020013
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Restorative Dentistry & Endodontics
2020 Volume.45 No. 2 p.13 ~ p.13
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Influence of modeling agents on the surface properties of an esthetic nano-hybrid composite
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Kutuk Zeynep Bilge
Erden Ecem
Aksahin Damla Lara
Durak Zeynep Elif
Dulda Alp Can
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Abstract
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Objective: The aim of this study was to evaluate the influence of different modeling agents on the surface microhardness (Vickers hardness number; VHN), roughness (Ra), and color change (ΔE) of a nano-hybrid composite with or without exposure to discoloration by coffee.
Materials and Methods: Sixty-four cylinder-shaped nano-hybrid composite specimens were prepared using a Teflon mold. The specimens' surfaces were prepared according to the following groups: group 1, no modeling agent; group 2, Modeling Liquid; group 3, a universal adhesive (G-Premio Bond); and group 4, the first step of a 2-step self-adhesive system (OptiBond XTR). Specimens were randomly allocated into 2 groups (n = 8) according to the storage medium (distilled water or coffee). VHN, Ra, and ΔE were measured at 24 hours, 1 week, and 6 weeks. The Kruskal-Wallis test followed by the Bonferroni correction for pairwise comparisons was used for statistical analysis (α = 0.05).
Results: Storage time did not influence the VHN of the nano-hybrid composite in any group (p > 0.05). OptiBond XTR Primer application affected the VHN negatively in all investigated storage medium and time conditions (p < 0.05). Modeling Liquid application yielded improved Ra values for the specimens stored in coffee at each time point (p < 0.05). Modeling Liquid application was associated with the lowest ΔE values in all investigated storage medium and time conditions (p < 0.05).
Conclusion: Different types of modeling agents could affect the surface properties and discoloration of nano-hybrid composites.
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KEYWORD
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Color change, Microhardness, Modeling agents, Nano-hybrid composite, Surface roughness
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