Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry

Abstract

The aim of this study was to investigate the wear of four nanofilled resin composites using simulated toothbrushing for 50,000 cycles with calcium carbonate slurry. The depth of abrasion and roughness (Ra) were measured after each 10,000 brushing cycle. The surface texture of the worn samples was examined by SEM.The wear depths of the nanofill Filtek Supreme XT (FIL), the nanohybrides Grandio (GRA), Tetric EvoCeram (TET), and Venus Diamond (VED) increased linearly with numbers of brushing cycles or approximately 80, 12, 600, and 60 µm, respectively after 50,000 strokes. Surface roughness showed virtually no change between 10,000 and 50,000 brushing cycles; the ranking order was TET < FIL < GRA < VED. FIL showed rather uniform abrasion with nanoclusters protruding from the surface. TET was very smoothly abraded without signs of debonding of the prepolymerized particles, whereas GRA and VED showed pronounced wear of the matrix polymer surrounding larger glass filler particles.

Clinical Evaluation of Resin-based Composites in Posterior Restorations: Two-year Results

“…[47][48] However, there is no positive correlation between wear and surface roughness. 49 Yazici and others documented that Grandio showed the highest roughness values when compared with a flowable, a hybrid and a polyacid modified composite, in vitro. 50 In clinical studies with a split-mouth design, no differences in surface roughness/texture could be found for extended Class II restorations made with Tetric Ceram and Grandio after four years of observation.…”

Toothbrushing alters the surface roughness and gloss of composite resin CAD/CAM blocks

“…Some investigators measured the volume loss from surface wear 8,11,17,18) . In the present study, three parameters were chosen for evaluating the alteration of surface morphology after polishing and toothbrushing.…”

“…The bristles of the toothbrush act as an antagonist while the toothpaste slurry is used as the medium. Many investigations have shown the effects of toothbrushing on the surface roughness and gloss of composite resins, in terms of brushing time [9][10][11] , brushing force 12,13) , and abrasivity of the particles contained in the toothpaste 14) . An increase in toothbrushing cycles was shown to deteriorate the smoothness and glossy appearance of conventional composite resins 15) .…”

Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins

“…9 It is well documented, that brushing with toothpaste roughens the surface and causes wear of composite resin restorations, although to different extent with different composite classes. 10,11 Wear and roughness of resinbased restorations may impair the esthetic appearance of the restorations and might have an influence on plaque accumulation and staining. With the introduction of new composite resins and manufacturers' claims of high wear resistance and surface smoothness, in vitro evaluation of such new products using simulated toothbrushing is desirable.…”

“…11,20 Fig. 8: The SEMs at 1k magnification demonstrate the surface textures of VED specimens produced after 50k brushing with abrasive slurry for soft, medium and hard toothbrushes, respectively.…”