Abstract
The purpose of this study was to evaluate the dentin bond strength of restorations made of different polymeric materials with Single Bond Universal Adhensive and etch-and-bond resin cement. Ceromer (ceramage, Shofu), Polymethylmethacrylate (PMMA DISK, Yamahachi), resin nanoceramic (Lava Ultimate, 3M ESPE), and polymer-infiltrated-ceramic-network (Vita Enamic, Vita Zahnfabrik) specimens (n=15/group) were fabricated respectively. Dentin specimens were prepared from extracted third molars stored in distilled water in a refrigerator (4°C). Single Bond Universal Adhensive was applied to the prepared tooth and light cured. Then, specimens were cemented using 3M ESPE RelyXTM Uitimate ClikerTM adhesive resin cement. All cemented specimens were stored in distilled water for 24 h and subjected to shear forces by a universal testing machine. Vita Enamic was found to show the highest shear bond strength values. The shear bond strength of Lava Ultimate was weaker than that of Vita Enamic. But there was no statistical difference between Vita Enamic and Lava Ultimate. Both of them showed significantly higher shear bond strength than the Ceramage and PMMA groups. The lowest values were obtained for PMMA and there was a significant difference between the PMMA and Ceramage groups. The bond strength of the polymeric materials is material dependent. So doctors can use them for patients with different intent.
Highlights
In recent decades, metal-free, tooth-colored and high-performance restorations, such as ceramics or polymeric materials, have been used to replace missing tooth structures to rehabilitate the esthetics and functions of defected teeth
The advantage of ceramic restorations is that ceramics have superior esthetic appearance, good biocompatibility, durability, color stability [1], and can mimic the structural characteristics of natural teeth [2]
Polymeric materials have been introduced for dental restorations [5], and with continuous evolution of polymeric materials have led to materials that have esthetic appearance, higher abrasion resistance and inferior discoloration [6], as well as less abrasive effect on the antagonist enamel [7,8,9]
Summary
Metal-free, tooth-colored and high-performance restorations, such as ceramics or polymeric materials, have been used to replace missing tooth structures to rehabilitate the esthetics and functions of defected teeth. It has been reported that one of the key advantages of polymeric restorations is the low abrasiveness of the enamel antagonists in comparison with ceramics [10,11,12]. Ender et al [16] reported that, based on the findings of marginal adaptation, fracture load and macroscopic fracture mode, polymeric materials may be applicable as long-term restorations in some cases. In view of these advantages, polymeric materials have been considered as economic alternatives for ceramics with faster processing, higher performance, and lower costs [17, 18]
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