Optical properties of composite restorations influenced by dissimilar dentin restoratives

• Published in: Dental materials Vol. 34; no. 5; pp. 737 - 745
• Main Authors: Marjanovic, Jovana, Veljovic, Djordje N., Stasic, Jovana N., Savic-Stankovic, Tatjana, Trifkovic, Branka, Miletic, Vesna
• Format: Journal Article
• Language: English
• Published: England Elsevier Inc 01.05.2018; Elsevier BV
• Subjects: Biodentine; Calcium Compounds - chemistry; Capping; Color; Colorimetry; Composite; Composite Resins - chemistry; Data processing; Dental Enamel; Dental Materials - chemistry; Dental restorative materials; Dentin; Dentin restorative; Dentistry; Durapatite - chemistry; Enamel; Enamel layer; EverX; Hydroxyapatite; Layered composite restoration; Layering technique; Light; Materials Testing; Optical properties; Optics; Optics and Photonics; Polymer matrix composites; Restoration; Shade; Silicates - chemistry; Spectrophotometry; Thickness; Translucency; Variance analysis; Layered composite restoration; Layering technique; Biodentine; Dentin restorative; Composite; Color; EverX; Hydroxyapatite; Enamel layer; Translucency
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2018.01.017

•2mm composite recommended for covering esthetically unfavorable dentin restoratives.•Despite high opacity, esthetically satisfactory results may be achieved with Biodentine.•EverX affects restoration translucency more than color. To evaluate optical properties (color and translucency) of ‘sandwich’ restorations of resin-based composites and esthetically unfavorable dentin restoratives. Cylindrical ‘dentin’ specimens (8mm in diameter and 2mm thick, N=5/group) were prepared using EverX Posterior (GC), Biodentine (Septodont), experimental hydroxyapatite (HAP) or conventional composites (Gradia Direct Posterior, GC; Filtek Z250 and Filtek Z500, 3M ESPE). Capping ‘enamel’ layers were prepared using composites (Gradia Direct Posterior, Filtek Z250 or Z550) of A1 or A3 shade and the following thickness: 0.6, 1 or 2mm. Color (ΔE) and translucency parameter (TP) were determined using a spectrophotometer (VITA Easyshade Advance 4.0, VITA Zahnfabrik). Data were statistically analyzed using analysis of variance with Tukey’s post-hoc tests (α=0.05). TP was greatly affected by layer thickness, whilst ΔE depended on shade and layer thickness of the capping composite. HAP and Biodentine showed significantly lower TP and higher ΔE (deviation from ‘ideal white’) than composites (p<0.05). Greater TP was seen in EverX_composite groups than in corresponding control groups of the same shade and thickness. TP of composites combined with Biodentine or HAP was below 2, lower than the corresponding control groups (p<0.05). Within-group differences of ΔE were greatest in HAP_composite groups. EverX_Gradia and EverX_FiltekZ250 combinations showed the most comparable ΔE with the control groups. A 2mm thick layer of composite covering dentin restoratives with unfavorable esthetics is recommended for a final ‘sandwich’ restoration that is esthetically comparable to a conventional, mono-composite control restoration.