Abstract
BackgroundThe aim of this study includes synthesis of zinc dimethacrylate ionomer (ZDMA) by a new method, incorporate it into resin bonding and evaluate its antibacterial, physical and mechanical properties.Material and MethodsResin adhesives containing 0 to 5% wt of ZDMA was produced and the following tests were accomplished: A: Antibacterial test: 1.Direct contact test. 2.Material aging; in both of them the bacterial colony counting were performed. B: Physical test: 1.Degree of conversion (D.C). 2.Evaluating the amount of released Zinc ion release in aqueous medium. C: Mechanical test: 1.Compressive strength test. 2.Shear bond test (enamel and dentine separately). The obtained results were statistically analyzed using One Way ANOVA and LSD post hoc test (α=0.05).ResultsThe anti-bacterial test revealed that all the ZDMA containing groups significantly reduced the amount of Streptococcus Mutans bacteria. Moreover, the D.C in all ZDMA groups was enhanced. Furthermore, ion release analysis revealed noticeable stability of Zn2+ in samples, as in the 5wt.% group it was even after nine cycle of 24h wash. On the other hand, the compressive strength was significantly reduced just in the 5% ZDMA group while the other groups were superior comparing to the control. In addition, there was no significant difference among the enamel shear bond strength of the groups. However, about the dentine shear bond strength, only the 5% ZDMA group was significantly higher than the control.ConclusionsLow percentages of ZDMA in adhesive could impart anti-bacterial efficacy without challenging its mechanical and physical properties. Key words:Dental Resin Bonding, Zinc, Streptococcus mutans, Degree of conversion, Compressive strength.
Highlights
Nowadays, tooth colored restorations are increasingly interested in dental offices according to the aesthetic demands [1,2]
Many nano-particles were incorporated for this purpose in dental resins [2]. Most of these additives impart strong anti-bacterial composites initially, their durability was reported very questionable because they would dissolve in the aqueous environment that lead to fading of anti-septic efficacy of prepared dental resin [10,16]
Zinc-methacrylate (ZM) is a functional monomer that could be copolymerized with the dental resin composite because the main backbone of most dental resins is based on methacrylate groups
Summary
Tooth colored restorations are increasingly interested in dental offices according to the aesthetic demands [1,2]. The time depended release of these substances from the resin matrix would results to physical voids in the composite mass that brings about lower mechanical properties of dental composites [2,10] They would adversely affect the clinical performance of tooth colored restorations in long periods especially when higher fractions of them were added [10]. Employing antibacterial monomers, which are chemically bond into the resin matrix, could ensure the stability of anti-microbial activity [17,18] As it is mentioned, metallic ions are useful anti-bacterial agents in dental materials [10]. In addition the Zn 2+ ion releasing intervals were assed
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