Kutuk Zeynep Bilge, Erden Ecem, Aksahin Damla Lara, Durak Zeynep Elif, Dulda Alp Can
Department of Restorative Dentistry, School of Dentistry, Hacettepe University, Ankara, Turkey.
Restor Dent Endod. 2020 Jan 29;45(2):e13. doi: 10.5395/rde.2020.45.e13. eCollection 2020 May.
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.
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 ( = 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).
Storage time did not influence the VHN of the nano-hybrid composite in any group ( > 0.05). OptiBond XTR Primer application affected the VHN negatively in all investigated storage medium and time conditions ( < 0.05). Modeling Liquid application yielded improved Ra values for the specimens stored in coffee at each time point ( < 0.05). Modeling Liquid application was associated with the lowest ΔE values in all investigated storage medium and time conditions ( < 0.05).
Different types of modeling agents could affect the surface properties and discoloration of nano-hybrid composites.
本研究旨在评估不同造型剂对纳米混合复合材料表面显微硬度（维氏硬度值；VHN）、粗糙度（Ra）以及在有或无咖啡致变色情况下颜色变化（ΔE）的影响。
使用聚四氟乙烯模具制备64个圆柱形纳米混合复合材料标本。标本表面按以下组进行处理：第1组，不使用造型剂；第2组，造型液；第3组，通用粘结剂（G-Premio Bond）；第4组，两步自粘结系统的第一步（OptiBond XTR）。根据储存介质（蒸馏水或咖啡）将标本随机分为2组（每组 = 8）。在24小时、1周和6周时测量VHN、Ra和ΔE。采用Kruskal-Wallis检验并随后进行Bonferroni校正以进行两两比较，用于统计分析（α = 0.05）。
储存时间对任何组的纳米混合复合材料的VHN均无影响（P > 0.05）。在所有研究的储存介质和时间条件下，应用OptiBond XTR底漆对VHN有负面影响（P < 0.05）。在每个时间点，应用造型液使储存在咖啡中的标本的Ra值得到改善（P < 0.05）。在所有研究的储存介质和时间条件下，应用造型液与最低的ΔE值相关（P < 0.05）。
不同类型的造型剂会影响纳米混合复合材料的表面性能和变色情况。
