Pennisi Pedro Rogério Camargos, Silva Pedro Urquiza Jayme, Valverde Fábio Scorsolini, Clemente Ticiane Campos, Cerri Vitória, Biaco Maria Eduarda, Ferreira Rebeca Garcia Rosa, Paranhos Luiz Renato, Moffa Eduardo Buozi
School of Dentistry, Federal University of Uberlândia, Uberlândia/MG, Brazil.
School of Dentistry, University Center - UNIFAE, São João da Boa Vista/Sao Paolo, Brazil.
Eur J Dent. 2024 Feb;18(1):104-108. doi: 10.1055/s-0040-1721315. Epub 2021 May 31.
The low resistance to fracture has limited the use of indirect composite resins for dental restorations, particularly in regions that are exposed to strong occlusal forces. To overcome this issue, different types of reinforcement for composites have been proposed, one of which is carbon nanotubes (CNTs). The aim of this study was to evaluate the flexural resistance of one commercial indirect composite resin (Sinfony, 3M/ESPE) after incorporation of single-wall carbon nanotubes (SWCNTs; Sigma-Aldrich, Inc., St. Louis, Missouri, United States) with or without the silanization form.
Specimens of composite resin were fabricated in a Teflon mold. The composite resin was prepared according to the manufacturer's instructions ( = 10 for each group), with SWCNTs in three concentrations.
The SWCNTs and SWCNT/SiO-ATES specimens were evaluated by transmission electron microscopy, and a flexural test was conducted according to the ISO 4049/2009. Flexural strength data in MPa were submitted to one-way ANOVA following Tukey ( < 0.05).
The SWCNTs did not improve the flexural strength of indirect composite resin when compared with the control, independent of the concentration added ( > 0.05). However, when SWCNTs and SWCNTs/SiO2-ATES were compared, the SWCNTs/SiO2-ATES showed higher values than the three concentrations of SWCNTs ( < 0.05).
The silanization process improves the SWCNTs strength proprieties, but the modification of chemical bonding between SWCNT and SWCNT/SiO-ATES modified resins, in different concentrations, did not improve the composite resin flexural strength.
间接复合树脂较低的抗断裂性限制了其在牙齿修复中的应用，尤其是在承受强大咬合力的区域。为克服这一问题，已提出了不同类型的复合材料增强方法，其中之一是碳纳米管（CNT）。本研究的目的是评估一种商用间接复合树脂（Sinfony，3M/ESPE）在加入有或没有硅烷化形式的单壁碳纳米管（SWCNT；Sigma-Aldrich公司，美国密苏里州圣路易斯）后的抗弯强度。
在聚四氟乙烯模具中制作复合树脂标本。复合树脂按照制造商的说明制备（每组n = 10），加入三种浓度的SWCNT。
通过透射电子显微镜对SWCNT和SWCNT/SiO₂-ATES标本进行评估，并根据ISO 4049/2009进行抗弯测试。以MPa为单位的抗弯强度数据在Tukey检验后进行单因素方差分析（P < 0.05）。
与对照组相比，SWCNT并未提高间接复合树脂的抗弯强度，与添加浓度无关（P > 0.05）。然而，当比较SWCNT和SWCNT/SiO₂-ATES时，SWCNT/SiO₂-ATES的值高于三种浓度的SWCNT（P < 0.05）。
硅烷化过程改善了SWCNT的强度特性，但不同浓度下SWCNT与SWCNT/SiO₂-ATES改性树脂之间化学键的改变并未提高复合树脂的抗弯强度。
