Abstract
Using copolymers materials in the preparation of dental fillings is now more common as a result for needs for more esthetic materials of filling and the international ban on the use of products that contain mercury, amongst others dental amalgams. On the other hand, a disadvantage with the Dental Nanocomposites is that they have a polymerization shrinkage. Particles of the filler are combined in the amongst other components for shrinkage minimization. Filler particle sizes have decreased lately and the majority of Dental Nanocomposites include Nano-particles. New Nanocomposites materials based on 2,2 propyl bisphenyl glycidyldimethacrylate (Bis-GMA) and unsaturated monomers ( Methacrylic acid,Acrylicacid,2,2propylbisphenylglycidyldimethacrylate,Triethyleneglycoldimethacrylate ) with Nano inorganic fillers such as (SiO2,ZrO2 and Hydroxyapatite) were characterized and synthesized for the sake of evaluating the potential applications they have in the field of dentistry, as restoration materials. The initial method was generating and characterizing new dental Nano-composites in presence of Triethylene glycol dimethacrylate (TEGDMA) as crosslinking agent. Composites which contain Bis-GMA and Triethylen glycoldimethacrylate) at the ratio (wt/wt) of 40/20, filled with various Nanofiller amounts (about 4.6%wt) were produced. Photo-polymerization has been induced with camphoroquinone / N,N-dimethylaminoethyl methacrylate(CQ/DMAEMA) present, as a system of photo-initiation. Physicochemical properties, such as volumetric shrinkage (VS), water sorption (WS) and water solubility (WSL) were studied. Characterization is performed with the use of SEM and FTIR spectrum. SEM is utilized for showing the distributions of particle sizes and particle agglomeration of the treated Nanofillers in Nanocomposite. FTIR spectroscopy is initially utilized for identifying qualitative construction of the Nanocomposites. The Thermal stability of all dental Nanocomposites were also studied using the TGA and DSC techniques. The strength and the aesthetic characteristics of resin based Nanocomposite open the possibility of using it for each of the posterior and anterior restorations. Flexural strength, compressive strength, wear resistance and hardness were evaluated. The presented research has the aim of addressing current key utilizations of the practical Nanotechnology in the field of dentistry, most importantly, tooth structure restoration with Resin-based composites (RBCs) which benefit from the Nano-particles.
Highlights
AbstractUsing copolymers materials in the preparation of dental fillings is more common as a result for needs for more esthetic materials of filling and the international ban on the use of products that contain mercury, amongst others dental amalgams
The preparation of polymer (A) has been done via co-polymerization process that is related to the Methacrylic acid (MA), Acrylic acid (AA), bisphenyl glycidyldimethacrylate (Bis-GMA), with cross-linker (TEGDMA),in the presence of camphoroquinone as photoinitiator and N,N-dimethylaminoethyl methacrylate as accelerator the reaction was continued through a process of mixing for 40 minutes and at room temperature under N2 gas for the purpose of removing dissolved oxygen, just as can be seen in reaction scheme (1): Scheme 1 Synthesis of polymer (A)
It must be indicated that the results of SL could be undervalued for more hydrophilic monomer, due to the fact that the water yield stronger hydrogen bond interaction with the hydroxyl and, as well as weak bond with the ethylene glycol unit, the could be hindering the water elimination throughout the 2nd period of storage in desiccators [22]
Summary
AbstractUsing copolymers materials in the preparation of dental fillings is more common as a result for needs for more esthetic materials of filling and the international ban on the use of products that contain mercury, amongst others dental amalgams. Filler particle sizes have decreased lately and the majority of Dental Nanocomposites include Nano-particles. New. Nanocomposites materials based on 2,2 propyl bisphenyl glycidyldimethacrylate (Bis-GMA) and unsaturated monomers Nanocomposites materials based on 2,2 propyl bisphenyl glycidyldimethacrylate (Bis-GMA) and unsaturated monomers ( Nano inorganic fillers such as (SiO2,ZrO2 and Hydroxyapatite) were characterized and synthesized for the sake of evaluating the potential applications they have in the field of dentistry, as restoration materials. The initial method was generating and characterizing new dental Nano-composites in presence of Triethylene glycol dimethacrylate (TEGDMA) as crosslinking agent. Physicochemical properties, such as volumetric shrinkage (VS), water sorption (WS) and water solubility (WSL) were studied.
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