Abstract
Recently, an epoxy-based resin-Filtek Silorane-has been proposed for restorative fillings. It was the aim of the investigation to evaluate the suitability of this novel resin for orthodontic bracket bonding on unground enamel. Shear bond strength was measured for two adhesives-Filtek Silorane, Transbond XT-in combination with steel, ceramic and polymer brackets. For Filtek Silorane etching was performed with the Silorane self-etching primer, as well as phosphoric acid. The Transbond XT samples were etched with phosphoric acid only and served as the control group. All samples were thermo-cycled (1000×, 5–55 °C). Shear testing was carried out with an Instron 3344. In addition, ARI scores were evaluated. The Shear bond strength showed a weak adhesion of Filtek Silorane to unprepared enamel, either with the self-etching primer or the conventional etching (0.87–4.28 MPa). The Shear bond strength of the control group was significantly higher (7.6–16.5 MPa). The ARI scores showed a clear failure at the enamel-adhesive interface for all Filtek Silorane samples. For the combination of Transbond XT and different brackets the failure was found at the adhesive–bracket interface. The novel epoxy-based resin Filtek Silorane is not appropriate for bracket bonding to unprepared enamel.
Highlights
Academic Editors: Daniele Botticelli, Adriano Piattelli, Gabi Chaushu and Patrick R
No samples were lost through thermo-cycling in the Transbond XT groups
The Silorane samples, either treated with conventional etching in addition to self-etching or self-etching alone, showed very low bonding forces to the untreated bovine enamel and were significantly lower (p ≤ 0.05) than all Transbond XT groups (Table 1, Figure 1)
Summary
Academic Editors: Daniele Botticelli, Adriano Piattelli, Gabi Chaushu and Patrick R. Since the introduction of dental adhesives by Buonocore [1], many modifications and attempts to develop resins which were more stable, aesthetically pleasing, or had a simplified handling were undertaken [2]. The polymerization chemistry of the vast majority of resins is that of a methacrylate resin. These resins polymerize by the opening of double bindings through free radicals, which thereafter can interact with opened bindings of other methacrylate molecules. One of the major problems with methacrylate- based resins was the relatively high shrinkage during polymerization. The shrinkage is due to an increase in viscosity during polymerization which inhibits the flow of unpolymerized methacrylates and radicals in the post-gel state and in turn leads to a contraction of the material [3]
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