Abstract
The purpose of the study was to evaluate the adhesion between dental core resin and epoxy resin-based fiber post after treatment with non-thermal atmospheric pressure plasma (NTAPP) and compare with conventional methods of epoxy resin-based fiber post treatments. Contact angle was measured on the surface of epoxy resin before and after NTAPP treatment and X-ray photoelectron spectroscopy was used to analyze the surface chemistry. Finally, two shear bond strength tests were carried out; shear bond strength between core resin and epoxy resin for comparison between NTAPP treated and untreated sample, and push-out shear bond strength between core resin and NTAPP treated commercially available epoxy resin-based fiber post for comparison between NTAPP treated samples with conventionally treated samples. Contact angle on the surface of epoxy resin generally decreased with increasing NTAPP treatment time with presence of surface chemical changes. Also, there was significantly higher shear bond strength and push-out shear bond strength between epoxy resin and core resin for NTAPP treated epoxy resin, even to the conventionally treated epoxy resin-based fiber post with hydrofluoric acid or silane. In conclusion, new technology of NTAPP has potential for application on the epoxy resin-based fiber post to improve endodontic restoration success rate.
Highlights
Fiber-reinforced composite posts, or fiber post, are widely used to restore endodontically-treated teeth that have insufficient coronal tooth structure to retain a core for the definitive restoration in dentistry [1]
Another null hypothesis of this study was that there would be no difference in surface energy and surface chemistry between non-thermal atmospheric pressure plasma jet (NTAPPJ) treated epoxy resin-based fiber post and epoxy resin-based fiber post not treated with NTAPPJ
The results showed that the contact angles decreased for each of the three different liquids used following Non-thermal atmospheric pressure plasma (NTAPP) treatment on epoxy resin (Figure 4a) and consequent surface energy increased with NTAPP treatment (Figure 4b)
Summary
Fiber-reinforced composite posts, or fiber post, are widely used to restore endodontically-treated teeth that have insufficient coronal tooth structure to retain a core for the definitive restoration in dentistry [1]. Fiber posts are made of carbon, quartz, or glass fibers embedded in a matrix of either epoxy resin or methacrylate resin [2]. Epoxy resin is often preferred over methacrylate resin as a matrix due to its high degree of conversion and highly cross-linked structures [3]. Fiber post retention depends on the strength of the chemical and micromechanical interaction between fiber post material and core resin [4] and the absence of chemical interaction between the methacrylate-based core resin composite and epoxy resin matrix of fiber posts represents the primary cause of weakness in. Sci. 2020, 10, 2535 post-to-core resin bonds [5]. Numerous studies have attempted to improve the bond strength between epoxy resin-based fiber posts and core resins [6,7,8,9]
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