Effect of Different Polishing Systems on the Surface Roughness and Gloss of Novel Nanohybrid Resin Composites

Abstract

Objectives To evaluate the surface roughness and gloss of three nanohybrid resin composites after polishing with three different polishing systems. Materials and Methods A total number of 112 disc specimens (10 × 3 mm) were prepared from nanohybrid—Empress Direct (ID), Grandio (GR), Filtek Z550 (ZN) and a microhybrid resin composite restorative materials—Filtek Z250 (ZM). Following 24-hour storage in 37°C distilled water, each composite group (n = 28) was assigned into four groups (n = 7) according to finishing/polishing (F/P) system: Mylar strip, Optrapol, Politip, and Sof-Lex (SL). The surface roughness (Ra, mm) was measured by a novel three-dimensional method using an image analysis software attached to an environmental scanning electron microscope. A glossometer was used to measure the surface gloss. Results Statistical analysis used was ANOVA test. Two-way Anova test revealed that the “type of composite” and “F/P techniques” had a significant effect on both surface roughness and gloss of the tested resin composite materials (p < 0.05). Tukey’s post hoc test showed that ID, GR, and ZN revealed lower surface roughness and higher surface gloss than ZM within the same polishing system (p < 0.05). Sof-Lex polishing discs produced the lowest surface roughness and highest surface gloss values compared with Optrapol and Politip (p < 0.05). Conclusion The tested F/P systems provided comparable surface roughness and gloss for nanohybrid composites. The Sof-Lex system provided the best surface roughness and gloss for nanohybrid composites.

Investigation of surface roughness values of various restorative materials after brushing with blue covarine containing whitening toothpaste by two different methods: AFM and profilometer

“…Simulated toothbrushing modifies the balance between organic matrix and filler particles. The Ra also depends on the microstructure of the resin composites used (Ruivo, Pacheco, Sebold, & Giannini, 2019; Soliman et al, 2020).…”

Reabilitação estética e funcional das bordas incisais dos dentes anteriores com fechamento de diastemas e reanatomização em resina composta: relato de caso clínico

“…Tendo em vista esses pré-requisitos, uma resina composta nanohíbrida foi escolhida como o material para realizar a restauração direta, já que esse material promove estabilidade de cor, baixa degradação da matriz de resina 26,27, e ótimo resultados após acabamento e polimento 28,29 . Isso parece se justificar pela adição de nanopartículas de carga de sílica e vidro na matriz de resina, que preenchem os espaços entre as partículas maiores 26,27,30 , deixando a restauração menos sujeita às ações hidrolíticas, além de proporcionar melhores propriedades mecânicas, como uma resistência ao desgaste satisfatória 26,27,30 Atualmente, várias técnicas para realização de trabalhos restauradores foram descritas, como o uso de coroas manufaturadas, trabalho à mão livre com ou sem ajuda de tiras de matriz, e uso de guias de silicone 31 .…”

Effect of Polishing on the Surface Microhardness of Nanohybrid Composite Resins Subjected to 35% Hydrogen Peroxide

“…[ 14 15 ] Surface microhardness is a mechanical property that determines the degree of deformation in a material and its resistance to indentation, being of great importance in composite resins, since this property confers better resistance to wear and scratching. [ 4 5 , 7 ] For this reason, the purpose of this study was to evaluate the effects of polishing on the surface microhardness of nanohybrid composite resins previously subjected to 35% hydrogen peroxide gel.…”

“…The higher the microhardness of the restorative material, the better the resistance to wear and surface scratching. [ 3 4 ] It is therefore important to improve this mechanical property of the composite resin surface by polishing, as this procedure aims to eliminate rough surfaces that will eventually affect its resistance to chewing forces, as small surface reliefs can fracture and facilitate pigment retention and even facilitate the formation of secondary caries. [ 5 6 7 ]…”