Effect of filler composition of dental composite restorative materials on radiopacity in digital radiographic images

Abstract

The purpose of this study was to evaluate the effect of filler composition on the radiopacity of 16 dental composite restorative materials using digital radiography. Five disc‐shaped specimens of each composite material were prepared using Teflon molds and five enamel and dentin specimens were prepared from human teeth. The composite specimens were placed on a digital sensor together with a tooth fragment and an aluminum stepwedge and a digital dental X‐ray unit was used at the same exposure conditions. The mean gray values of each composite specimen, tooth fragment, and stepwedge were measured on the digital images using a software program. Statistical analysis of the data was implemented with one‐way ANOVA and post hoc Tukey's HSD test (a = 0.05). The composites presented higher radiopacity than dental tissues (p < 0.05), except Filtek Silorane which exhibited lower radiopacity than enamel (p < 0.05). Linear regressions revealed a very low correlation between radiopacity and filler content of the composites. The composite restoratives presented great variations in radiopacity. Concentration and type of the radiopacifying agents included in the composites crucially affected radiopacity. The choice of the composite restorative materials is of great importance due to large variations in their radiopacity, which depends on their filler composition. POLYM. COMPOS., 39:E351–E357, 2018. © 2017 Society of Plastics Engineers

Surface Modification of ZrO2 Nanoparticles and Its Effects on the Properties of Dental Resin Composites

“…There is a certain linear relationship between the thickness of the aluminum and the gray value of aluminum in the image (Figure B). Therefore, the radiopacity (mm Al) of DRCs can be calculated by measuring the gray value of samples in the image …”

“…Dental resin composites (DRCs) for curing caries must meet requirements for physical and mechanical properties in their clinical applications. , Radiopacity is one of the most important properties since it allows dentists to distinguish DRCs from surrounding tooth structures easily, facilitating the diagnosis of secondary caries and the discovery of defects during a filling process. , Recommended by ISO 4049:2009, the radiopacity value of DRCs with 1 mm thickness should be equal to or higher than that of pure aluminum at the same thickness. An effective way to endow DRCs with suitable radiopacity is to incorporate a filler containing elements of high atomic numbers, such as Ba (56), Zr (40), and Sr (38) …”

“…An effective way to endow DRCs with suitable radiopacity is to incorporate a filler containing elements of high atomic numbers, such as Ba (56), Zr (40), and Sr (38). 5 Zirconia (ZrO 2 ) has been widely used in the field of dentistry such as crowns, fixed dentures, and implants due to its excellent mechanical, biological, and aesthetic properties. 6,7 As a radiopaque filler, ZrO 2 nanoparticles have been added to some commercial DRCs such as Z250 (3M, United States), Quixfil (Dentsply, Germany), and Enamel Plus HRI (Micerium, Italy).…”

Evaluation of Microleakage and Degree of Conversion of Three Composite Res-ins Polymerized at Different Power Densities

“…This finding can also be explained by the high organic matrix rate of Tetric EvoCeram (without TEGDMA monomer) as volume against Clearfil Majesty Posterior. [54,56,57].…”

Biofabricated silver nanoparticles incorporated polymethyl methacrylate as a dental adhesive material with antibacterial and antibiofilm activity against Streptococcus mutans

“…Dental restorative composites mainly consist of methacrylate resins and various kinds of fillers which enhance their mechanical, antimicrobial, optical and aesthetic properties (Babu et al 2016;Dionysopoulos et al 2017). Dental adhesives facilitate the binding of composites to the dentin and form an interlocked interface by penetrating into the dentin tubules.…”