Microhardness assessment of different commercial brands of resin composites with different degrees of translucence

Abstract

Owing to improvements in its mechanical properties and to the availability of shade and translucence resources, resin composite has become one of the most widely used restorative materials in present day Dentistry. The aim of this study was to assess the relation between the surface hardness of seven different commercial brands of resin composites (Charisma, Fill Magic, Master Fill, Natural Look, Opallis, Tetric Ceram, and Z250) and the different degrees of translucence (translucid, enamel and dentin). Vickers microhardness testing revealed significant differences among the groups. Z250 was the commercial brand that showed the best performance in the hardness test. When comparing the three groups assessed within the same brand, only Master Fill and Fill Magic presented statistically significant differences among all of the different translucencies. Natural Look was the only one that showed no significant difference among any of the three groups. Charisma, Opallis, Tetric Ceram and Z250 showed significant differences among some of the tested groups. Based on the results found in this study, it was not possible to establish a relation between translucence and the microhardness of the resin composites assessed. Depending on the material assessed, however, translucence variation did affect the microhardness values of the resin composites.

Influência de três modos de fotopolimerização sobre a microdureza de três resinas compostas

“…Esses fatores determinam a dureza de superfície das resinas compostas. Assim, a microdureza é considerada uma propriedade física essencial desses materiais [8] . A dureza pode ser definida como a capacidade de uma determinada substância em resistir a um edentador ou penetrador.…”

Effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations

“…Storage in water during 24 hours was tested because in the indirect fabrication technique, temporary restorations should remain stored in water until cementation onto the tooth preparations. resins: the higher the degree of conversion, the higher the hardness values 23 . Moreover, the use of bifunctional monomers such as EGDMA and TEGDMA 10 to form crosslinked chains improves the hardness values.…”

“…Regarding the inorganic filler, the hardness values obtained are also dependent on the volume added to the material. When the quantity of particles increases, the surface hardness of the material also increases 10,23,25 . Therefore, it may be suppose that the quality of polymerization of the composite resin with respect to the polymer density and the degree of conversion obtained was superior to that of the acrylic resins tested.…”

“…It has been reported that surface hardness of composite resins is influenced by both the organic matrix (monomers) and the inorganic filler 10,23 . With regard to the organic matrix, hardness depends on the density and structure of the polymer formed 23 and the degree of conversion after the polymerization 10 .…”

Avaliação in vitro da rugosidade superficial de resinas compostas, comparando diferentes sistemas de acabamento e polimento e após a profilaxia com jato de bicarbonato

“…As resinas compostas feitas pelo uso da nanotecnologia podem oferecer alta translucidez, alto brilho e retenção deste brilho semelhante aos compósitos microparticulados mantendo ao mesmo tempo propriedades físicas e ao desgaste equivalente a vários compósitos híbridos (Mitra et al, 2003;Celik et al, 2010 A resina composta vem sendo utilizada tanto para restaurações anteriores como posteriores. Isso decorre, principalmente, da adesão à estrutura dentária, de suas propriedades mecânicas e da disponibilidade de matizes que proveem quase que ilimitadas possibilidades de mimetizar a estrutura dental (Anfe et al, 2008;Pontes et al, 2009). Permitem a confecção de restaurações com preservação da estrutura dentária, excelente estética e baixo custo, quando comparadas com outras técnicas restauradoras diretas e indiretas (Pontes et al, 2009;Melo Júnior et al, 2011).…”