Abstract
The purpose of this study was to examine toothbrush-induced abrasion of resin composite restorations fabricated with flowable resin composites of different viscosities in vitro. In this study, six types of flowable resin composites with different flowability (Beautifil Flow F02, F02; Beautifil Flow F10, F10; Beautifil Flow Plus F00, P00; Beautifil Flow Plus F03, P03; Beautifil Flow Plus X F00, X00; and Beautifil Flow Plus X F03, X03) were used. For the toothbrush abrasion test, the standard cavity (4 mm in diameter and 2 mm in depth) formed on the ceramic block was filled with each flowable resin composite (n = 10) and brushed for up to 40,000 strokes in a suspension containing commercial toothpaste under the conditions of 500 g load, 60 strokes/min, and 30 mm stroke distance. After every 10,000 strokes, the brushed surface of the specimen was impressed with a silicone rubber material. The amount of toothbrush-induced abrasion observed on each impression of the specimen was measured using a wide-area 3D measurement device (n = 10). The viscosity was determined using a cone-and-plate rotational measurement system. Because of the effect of different shear rates on viscosity and clinical use, the values 1.0 and 2.0 s−1 were adopted as data (n = 6). In this study, the results of the toothbrush abrasion test demonstrated no significant differences in the amount of toothbrush-induced abrasion among flowable resin composites used (p > 0.05). No significant correlation was reported between toothbrush-induced abrasion and viscosities of flowable resin composites.
Highlights
The mechanical properties of resin composites are influenced by sizes, shapes, and contents of filler particles as well as the type of resin matrix
Resin composites composed of hybrid fillers, which contain multiple fillers of various sizes, have demonstrated high wear resistance at the occlusal surface, which is subjected to severe stresses during chewing
Shinkai et al [11] reported that the wear resistance of flowable resin composites containing nanosized or spherical fillers was equivalent to that of universal resin composites based on the results of three- and two-body wear testing
Summary
The mechanical properties of resin composites are influenced by sizes, shapes, and contents of filler particles as well as the type of resin matrix. Resin composites composed of hybrid fillers, which contain multiple fillers of various sizes, have demonstrated high wear resistance at the occlusal surface, which is subjected to severe stresses during chewing. Multiple in vitro and in vivo studies reported that the addition of variable-sized fillers [4,5,6,7,8,9] and nanosized filler particles [10,11] improved the wear resistance of universal resin composites, which has not raised concerns as a serious problem in clinical practice [12,13]. The mechanical properties of flowable resin composites have been improved by adopting new monomers and nanosized filler particles, and they are applied to various cavities in clinical settings. Shinkai et al [11] reported that the wear resistance of flowable resin composites containing nanosized or spherical fillers was equivalent to that of universal resin composites based on the results of three- and two-body wear testing
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