Color, Translucency and Masking Ability of a Recently Developed Bulk-Fill Resin Composite

Abstract

Objectives:To evaluate the color, translucency and masking ability of a newly developed bulkfill resin composite with enhanced opacity. Materials and Methods: A3 shade composite discs (n=20/material) (Filtek bulk-fill; FB andFiltek bulk-fill One; FBOne) were prepared at 2 and 4 mm thickness (n=10/thickness). Three different backgrounds (white tile, black tile, and C4 shade porcelain) and the intrinsic color for each material were used to determine the translucency parameter (between white and black backgrounds), and to simulate oral cavity darkness (between the black background and the intrinsic color of resin composite), and the discolored tooth structure (between C4 shade porcelain and the intrinsic color of resin composite). Additionally, the chroma coordinates were measured for 2 mm thickness on the different backgrounds. Data were analyzed by Mann-Whitney U test, and Wilcoxon test as a post hoc for multiple comparisons (p< .05). Results:A clinically perceptible color difference (Δ E* > 1.74) was recorded between FB and FBOne. FBOne showed significantly higher TP values (p< .001) than FB. None of the two materials could mask the oral cavity darkness in a clinically acceptable threshold (ΔE* > 2.7). FBOne showed a clinically acceptable (2 mm, ΔE* < 2.7) and un-perceptible threshold (4 mm, ΔE* < 1.74) for masking the discolored tooth substrate. Conclusions:FBOne is a promising bulk-fill resin composite showing an appropriate masking ability of the discolored tooth structure without interfering with its translucency.

Effect of Surface Treatments on Adhesion of Milled Polyetheretherketone Post to Different Composite Resin Core Build-Up Materials

“…However, compared to the airborne abrasion group, the bulk-fill demonstrated a significantly ( p <.001) higher bond strength value in sulfuric acid etching group. This difference could be attributed to two factors: first, the sulfuric acid produces sulfonate groups in PEEK polymer chains, which are then chemically cross-linked to the dental adhesives ( 32 , 33 ), and second, the translucency of bulk fill, which makes it easier to achieve a greater depth of cure and hence the bond strength ( 40 ). Furthermore, the close matching of the elastic modulus of bulk fill composite resin (11.6 GPa) to PEEK material (18.6 GPa) is one of the factors that could affect its bond strength because it uniformly distributes stresses and reduces their transmission to the restorations, thereby improving its adaptation ( 18 , 27 ).…”