Abstract
The goal of current research was to investigate the influence of adding low shrinkage “Phene” like comonomers hexaethylene glycol bis(carbamate-isoproply-α-methylstyrene) (HE-Phene) and triethylene glycol bis(carbamate-isoproply-α-methylstyrene) (TE-Phene) on the surface and color characteristics of composite resin. A range of weight fractions (0, 10, 20, 30, 40 wt.%) of HE/TE-Phene monomers were mixed with bisphenol A glycidyl methacrylate (GMA)/triethylene glycol dimethacrylate (TEGDMA) monomer. Experimental composite resins were made by mixing 71 wt.% of silica fillers to 29 wt.% of the resin matrix. A Vickers indenter and glossmeter were used for testing surface hardness (SH) and gloss (SG) at 60°. A chewing-simulator was used to evaluate the surface wear after 15,000 cycles. Color change (∆E) and translucency parameter (TP) were measured using a spectrophotometer. Data showed that HE/TE-Phene monomer had no negative impact (p > 0.05) on surface gloss, wear, color change and translucency of experimental composite resins. Surface hardness was in a reducing direction with the increas in HE/TE-Phene weight fraction (p < 0.05). The study results suggested that incorporating HE/TE-Phene monomers up to 30 wt.% with Bis-GMA/TEGDMA resin did not negatively influence the surface integrity of composite resins except for SH.
Highlights
Restorative dental composite resins produced out of a blend of silanized inorganic fillers and methacrylate monomers
We showed that the double bonds reactivity in the α-methylstyryl group of a novel Phene monomer was less than the double bond reactivity in a conventional methacrylate group [7,8]
The same lower let-lower letters ters indicate that there is no significant difference in surface gloss between experimental compoindicate that there is no significant difference in surface gloss between experimental composite resins site resins with different weight fractions of HE-Phene in the resin matrix
Summary
Restorative dental composite resins produced out of a blend of silanized inorganic fillers and methacrylate monomers. Limitations concerned curing contraction stress remain a practical challenge, leading to composite resin fillings failure [4,5,6]. In order to create composite resins with substantial enhancements, formulation of a novel resin approach, unlike the conventional dental resins, had been discussed. We showed that the double bonds reactivity in the α-methylstyryl group of a novel Phene monomer was less than the double bond reactivity in a conventional methacrylate group [7,8]. Utilization of Phene monomer with a small concentration of the double bond was an efficient method to manufacture composite resins with enhanced volumetric shrinkage and shrinkage stress [8]. Color change of cured composite resins including Phene monomer following storage was noticed, owing to the oxidization of the tertiary amine in the Phene structure [10]
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