Effect of filler size and filler loading on wear of experimental flowable resin composites

Abstract

The relationship between wear resistance and filler size or filler loading was clarified for the universal resin composite; however, their relationship in flowable resin composites has not been clarified.ObjectivesThe purpose of this study was to investigate the effect of filler size and filler loading on wear of experimental flowable resin composites by using a cyclic loading device.Material and MethodsNine experimental flowable resin composites consisting of three different sizes (70, 200 and 400 nm) and loading (50, 55 and 60 wt%) of filler were prepared. Bowl-shaped cavities were prepared on a flat surface of ceramic blocks using a No. 149 regular cut diamond point. The cavities were treated with a silane coupling agent and an all-in-one adhesive and then filled with each experimental flowable resin composite. The restored surfaces were finished and polished with a 1500-grit silicon carbide paper. The specimens were subjected to an in vitro two-body wear test using a cyclic loading device. The localized worn surfaces were evaluated at 10,000, 20,000, 30,000, and 40,000 cycles using a computer-controlled three-dimensional measuring microscope (n=5). The volumetric wear loss of the materials was calculated automatically by the equipment. Data were statistically analyzed with two-way ANOVA and post hoc Tukey test.ResultsTwo-way ANOVA showed that the filler size significantly influenced wear volume (p<0.003), but the filler loading did not have a significant effect (p>0.05). A post hoc Tukey test detected significant differences in filler size between 70 nm and 400 nm, and 200 nm and 400 nm (p<0.007).ConclusionThe experimental flowable resin composite containing a mean filler size of 400 nm exhibited significantly lower wear resistance in two-body wear compared with those containing mean filler sizes of 200 nm or 70 nm.

Characterization of low-cost Brazilian resin composites submitted to tooth brushing

“…Furthermore, if these filler particles are dislodged from the matrix during brushing, they could participate as an abrasive medium. 41 This explains the contrasting roughness values obtained by Filtek Z250 XT and/or Ultrafill and Llis after brushing.…”

Effect of Nano-filled Protective Coating on Microhardness and Wear Resistance of Glass-ionomer Cements

“…However, since RMGI still has the properties noted that increasing the filler content enhanced the mechanical properties of the restorative material. Shinkai et al [22], reported that restoration containing small sized fillers exhibited better wear resistance compared with that of restorations containing large fillers. Therefore, the higher surface microhardness in specimens coated with the Equia coat in this study is thought to be due to the filler content compared to the fillerfree adhesive.…”

Resistência à compressão, flexão e tração diametral de cimentos resinosos em tempos diferentes de armazenamento

“…As partículas de carga presentes nos dois materiais estudados também têm a função de melhorar as propriedades mecânicas, reduzir a contração de polimerização e diminuir a absorção de água (4,(8)(9), contribuindo dessa forma para a similaridade dos resultados obtidos nesse estudo. A união química entre as duas fases (orgânica e inorgânica) é dada pelo agente de união (silano) (3,8-9,16) também presente nos dois cimentos testados.…”

“…Na composição química dos cimentos resinosos também estão presentes as cargas inorgânicas (partículas de vidro e/ou sílica coloidal) tratadas com silano (3,(8)(9). De acordo com o tipo de partículas, esses cimentos podem ser classificados em microparticulados, híbridos e nanoparticulados.…”

“…Os microparticulados possuem partículas com tamanho médio de 0,04μm e seu conteúdo varia de 46 a 48% em volume. Os híbridos apresentam partículas com tamanho médio de 0,6 a 2,4μm e seu conteúdo, em volume, varia de 52 a 60% (8)(9). Já os nanoparticulados possuem partículas menores que 100nm e volume de até 60% (9).…”