Effect of Water Storage and Bleaching on Light Transmission Properties and Translucency of Nanofilled Flowable Composite

Abstract

This study investigated the effect of water sorption and bleaching on light transmission properties (Straight-light transmission (G0), Light diffusion (DF) and Amount of transmitted light (AV)) and translucency parameters (TP) of nano-filled flowable composites. A total of 35 composite disks (0.5 mm thickness) were prepared using A2 shade of 5 nanofiller composites (n = 7/each); Beautifil Flow Plus X F03 (SHOFU INC), Clearfil Majesty ES Flow (Kuraray Noritake Dental), Estelite Universal Flow (EUF, Tokuyama Dental), Estelite Flow Quick (Tokuyama Dental) and Filtek Supreme Ultra Flowable Restorative (FSU, 3M ESPE). Then, they were cured by LEDs (VALO, Ultradent) on standard mood (1000 mW/cm2) for 20 s. Samples were tested for straight-line transmission (G0), diffusion (DF), the amount of transmitted light (AV) and (TP) immediately after 24 h (dry storage), after 1-week water storage and after each of the three cycles of in-office bleaching (HiLite, SHOFU INC). Result: G0, DF, AV and TP were significantly affected by different materials (p < 0.001). The AV of FSU increased significantly after the 1-week water storage, then after the second bleaching cycle (p < 0.001). The TP for EUF slightly decreased (p = 0.019) after 1-week water storage, then increased throughout bleaching. Conclusion: Ageing/bleaching conditions do not affect G0, DF, AV and TP. The compositional variation between nano-filler composites resulted in a significant difference between materials.

Properties of Nanohybrid Dental Composites—A Comparative In Vitro Study

“…Therefore, all samples must be polished and lustered using the same preparation regime as described in the Materials and Methods section. In CM samples, large micro-particles of barium glass appear, with boulder aspects with some sharp corners that have a size range of 5-50 µm, which are very well distributed in the composite bulk, in good agreement with literature data [24,28]. These particles are very well embedded in the nanocomposite mass, assuring a coherent material.…”

Influence of Storing Composite Filling Materials in a Low-pH Artificial Saliva on Their Mechanical Properties—An In Vitro Study

“…Dental fillings are regularly subjected to a variety of destructive actions. Mechanical degradation can occur through food mastication and opposing teeth coming into contact [ 11 ]. In addition, composite materials are also affected by the chemicals present in food, alcohol, dyes, and drinks with an acidic pH level.…”

Mouthwashes: Surface Hardness and Accuracy of Dual-cured Visible Light-Cured Composite

“…Many studies have discovered that water is directly linked to composite organic matrix deterioration. The absorption of this liquid causes a pervasive process within the composite resin matrix that causes degradation and results in reduced physical and mechanical properties, particularly those related to resin hardness (17)(18)(19) . Although, according to this study, there was no reduction in surface hardness observed within distilled water group (control group) initially, after immersion of the composite filling in distilled water after 1 week, 4 weeks and after dual-curing .…”

“…The degradation is a complicated process that is influenced by the polymeric matrix and filler particles (14)(15)(16) as well as other mechanisms like water uptake within the matrix, mechanical and thermal cycling, and crack propagation. The deterioration of the composite organic matrix is related directly to the presence of water (17)(18)(19) . The lower roughness and hardness mechanical properties of the composite resin result from its deterioration when water absorption and widespread process within the composite matrix take place (20,21) .…”