Surface roughness and wear of resin cements after toothbrush abrasion

Abstract

Increased surface roughness and wear of resin cements may cause failure of indirect restorations. The aim of this study was to evaluate quantitatively the surface roughness change and the vertical wear of four resin cements subjected to mechanical toothbrushing abrasion. Ten rectangular specimens (15 × 5 × 4 mm) were fabricated according to manufacturer instructions for each group (n = 10): Nexus 3, Kerr (NX3); RelyX ARC, 3M ESPE (ARC); RelyX U100, 3M ESPE (U100); and Variolink II, Ivoclar/Vivadent (VL2). Initial roughness (Ra, µm) was obtained through 5 readings with a roughness meter. Specimens were then subjected to toothbrushing abrasion (100,000 cycles), and further evaluation was conducted for final roughness. Vertical wear (µm) was quantified by 3 readings of the real profile between control and brushed surfaces. Data were subjected to analysis of variance, followed by Tukey's test (p < 0.05). The Pearson correlation test was performed between the surface roughness change and wear (p < 0.05). The mean values of initial/final roughness (Ra, µm)/wear (µm) were as follows: NX3 (0.078/0.127/23.175); ARC (0.086/0.246/20.263); U100 (0.296/0.589/16.952); and VL2 (0.313/0.512/22.876). Toothbrushing abrasion increased surface roughness and wear of all resin cements tested, although no correlation was found between those variables. Vertical wear was similar among groups; however, it was considered high and may lead to gap formation in indirect restorations.

Surface Microhardness of Bulk-Fill Resin Composites Handled With Gloves

“…Karimzadeh et al 31 and Jager et al 32 mentioned that filler quantity in resin composites could be a factor that allows improving their surface microhardness. 2 , 33 , 34 In that sense, Rizzante et al, 33 in their study, observed that bulk fill–type nanohybrid resins achieved superior surface microhardness values compared to conventional resins with less filler. 11 , 12 As is known, Tetric N-Ceram Bulk Fill resin composite (76 wt%; 54 vol%) has lower inorganic filler and filler content than Filtek Bulk Fill (76.5 wt%; 58.4 vol%) and Opus Bulk Fill (76.5 wt%; 58.4 vol%) resins.…”

Toothbrushing Wear Resistance of Stained CAD/CAM Ceramics

“…However, the extrinsic staining is exposed to the oral environment and can be worn by toothbrushing in the long term [9,21]. Most of the abrasive simulation using toothbrushing evaluated the surface roughness quality [2,3,18,22] instead of wear rate [21,23,24]. In addition, limited data are available regarding the effect of toothbrushing on the staining layer of CAD/CAM ceramics over time [3,9,18,21].…”

“…The staining layer on the feldspathic ceramic is suggested to be removed after 10−12 years of simulated toothbrushing. This result could be improved if a glaze layer is applied over the stain, protecting it from wear [2,9,21,23,33]. A previous study evaluated the influence of load and brushing time on the surface roughness and gloss of a composite resin and two leucite-based ceramics.…”

Comparative physical and mechanical properties of a 3D printed temporary crown and bridge restorative material

“…All the cycles were performed at 37 ± 1ºC and 4.5 cycles/s. ( 16 ) Every 2 minutes, 0.4mL of slurry (toothpaste and distilled water at a ratio of 1:2) was automatically injected and the toothbrushes were changed after every 5000 brushing cycles. After brushing, specimens were stored immersed in water at 60ºC in absence of light during 24 hours ( 14 , 15 ).…”