Rugosidade e Microscopia de Força Atômica de Resinas Compostas Submetidas a Diferentes Métodos de Polimento

Abstract

Resumo: Este trabalho avaliou a rugosidade e a topografia de superfície de resinas compostas submetidas a diferentes métodos de polimento. Foram utilizadas 5 resinas (Filtek Z350, Master Fill, Vênus, Charisma e Durafill VS) e confeccionou-se 90 corpos de prova distribuídos em 6 grupos (n:15): SP: sem polimento; TB: ponta de borracha abrasiva; DL: disco de lixa em três granulações; FP: disco de feltro com pasta diamantada; ECS: escova de carbeto de silício; PS: ponta de silicone abrasiva. Após os polimentos, foram realizadas as análises da rugosidade com auxílio de um rugosímetro e da topografia de superfície com a microscopia de força atômica. Os valores foram tabulados e analisados estatisticamente pelos testes de Kruskal-Wallis, DUNN e ANOVA (α = 0,05). As médias variaram entre 0,01 µm (Filtek Z 350 -TB) e 0,27 µm (Charisma -ECS). Concluiu-se que para todas as resinas testadas o melhor método de polimento foi o feltro com pasta diamantada (FP). Palavras-chave: Dentística operatória, materiais dentários, polimento dentário, resina composta. Roughness and Atomic Force Microscopy of Composite Resins Submitted to Different Polishing MethodsAbstract: This study evaluated the surface topography and roughness of composite resins submitted to different polishing methods. Five resins were used (Filtek Z350, Master Fill, Venus, Charisma and Durafill VS) for preparing ninety samples, distributed into six groups (n=15): SP: no polishing, TB: abrasive rubber point; DL: sanding disc in three grits; FP: felt disc with diamond paste; ECS: silicon carbide brush; PS: abrasive silicon tip. After polishing, analyses of roughness with profilometry and topography with atomic force microscope were made. The data were analyzed using Kruskal-Walis, DUNN and ANOVA tests (α = 0.05). The averages ranged between 0.01 µm (Filtek Z350 -TB) and 0.27 µm (Charisma -ECS). For all the tested resin, the best polishing method was the felt disc with diamond paste (FP).

Influence of Finishing/Polishing in Surface Roughness of Conventional Nanocomposites and Bulk-Fill

“…Thus, C and PD groups of both composites exposed values above this threshold, as well as EN of BF. Authors such as Martins Alves et al 15 and Sahbz et al 20 expose that, when values of approximately 0.4 µm are exceeded, roughness can be clinically observed by the patient, so this could be verified in C groups of both composites, as well as in PF of BF.…”

“…For PD group (felt disc + diamond paste), it is noted that this system considerably reduced the surface roughness left by the diamond tip, possibly because it has high hardness micronized abrasive diamond grains, wearing the particles that were exposed irregularly 15 . Just as in the current research, the findings of Martins Alves et al 15 and Bittencourt et al 23 also confirmed the influence of this polishing mechanism on the roughness of compound resins, visualizing a decrease in Ra values when used on rough surfaces. In contrast, Costa et al 2 suggest that the use of diamond paste in composite resins may be of value when used later on for instruments with aluminum oxide in the composition, in the case of this study, present in Sof-Lex and Enhance.…”

“…Proper completion of the finishing/polishing step is essential for obtaining clinical results of excellence of direct restorations in composite resin 7,19,21 . The failure of this process directly affects the longevity of the composites used, as they result from other problems in the bacterial biofilm retention, chromatic alterations, discomfort, and consequent dissatisfaction by the patient [15][16][17]20 .…”

“…However, a rough and shapeless surface may cause a greater biofilm accumulation, secondary caries, periodontal problems and short-term chromatic alterations [15][16][17] . Thus, finishing appears at first, improving the anatomical form to the restored structure, and the polishing procedures aiming to reduce the roughness resulting from previously performed procedures, such as the use of burs on the surface 5,18 .…”

Surface smoothness of resin composites after polishing—A systematic review and network meta‐analysis of in vitro studies

“…The main characteristics of the 34 selected in vitro studies are presented in the supplemental material (Table S2) [1, 16–48]. All selected studies were conducted on resin composite specimens and pre‐roughened with diamond burs.…”