Interfacial microscopic examination and chemical analysis of resin-dentin interface of self-adhering flowable resin composite

Abstract

Background: The newly introduced self-adhering flowable resin-composites decrease the required time for application by incorporation of an acidic adhesive monomer, thus reducing the number of the steps, but its bonding is still uncertain. The aim of this study was to evaluate the interfacial microscopic examination and chemical analysis at the resin-dentin interface of a self-adhering flowable resin composite (Vertise-Flow) versus a total-etch (Te-Econom Plus) resin composite, using an etching agent (Eco-Etch gel) and bonding agent (Single Bond Universal). Methods: Sixteen freshly extracted sound human posterior teeth were used. The teeth were randomly divided into two groups: 8 specimens per type of composite. Standard-shaped class V cavities were prepared on the buccal surface. One group was restored by Te-Econom Plus resin composite by total-etch technique using Eco-Etch gel, which was applied to dentine for 15 seconds, followed by rinsing, drying and bonding agent application (Single Bond Universal). The other group restored directly with self-adhering resin composite (Vertise-Flow) without application of etch or bond. Curing was done for 20 seconds using a light emitting diode light curing unit. Evaluation of the resin-dentin interface was done microscopically by examination of marginal gap distance in μm using scanning electron microscope (SEM), and chemical analysis of silver particles was observed using SEM with energy-dispersive X-ray spectrometry after 24 hours of specimen storage in ammoniacal silver nitrate. Results: Regarding marginal gap distance (µm) and silver atomic % mean values, teeth restored with self-adhering resin composite (Vertise-Flow) showed significantly higher mean values than the multi-step etch and rinse resin composite group (5.2 vs 0; 12.2 vs 8.2, respectively). Conclusions: Resin-dentin bonding using total-etch resin composite technique was more effective than self-adhering flowable resin composite (Vertise-Flow) regarding marginal gap formation and penetration of silver particles. Further studies for bond strength could be performed.

Effect of two artificial aging protocols on color and gloss of single-shade versus multi-shade resin composites

“…Polymeric based materials are commonly used in dentistry [37][38][39]. Single-shade resin composites have been introduced in the dental market to facilitate the shade selection step and reduce the time of application performed in the other multi-shade resin composites [40,41] Although the color and gloss of some esthetic restorative materials may be promising initially, unfortunately color changes and loss of gloss may occur by time [42], beverages may accelerate such changes [42].…”

12-Month flexural mechanical properties of conventional and self-adhesive flowable resin composite materials

“…Despite these improvements, FRBC materials' ability to mediate shrinkage stress has been questioned 21,31,34) . Some in vitro studies suggest that FRBC materials used as restoration liners may reduce microleakage 15,[35][36][37] , but other studies have not largely validated this claim 17,18,[38][39][40][41][42][43][44][45] . Furthermore, in vivo studies using FRBC materials as Class II restoration liners report no improvement in clinical performance 17,18,46) .…”

Interfacial microscopic examination and chemical analysis of resin-dentin interface of self-adhering flowable resin composite

“…doi, 10.5256/f1000research.12306. d177061 12 Dataset 2: Scanning electron microscopy (SEM) showing gap formation (raw values included on the images) and SEM/energydispersive X-ray analysis (EDX) at the resin-superficial dentin interface in teeth treated with total-etch technique (Group A) and self-adhering resin composite (Group B) (n=8/group/method). doi, 10.5256/f1000research.12306.d177062 13…”