Abstract
Abstract In the present work, Bisphenol-A Glycidyl Methacrylate / Triethylene Glycol Dimethylacrylate based dental composites filled with 0-30 wt.% silane treated nano-ZnO were fabricated and tested for their dynamic mechanical properties. Samples were kept in each of three different mediums such as cold drink, distilled water and saliva for 7 days. The dynamic mechanical properties such as storage modulus, loss modulus and Tan delta were evaluated and compared for each composite under different conditions. The finding of results indicated that on adding 30 wt.% nano-ZnO, the storage modulus was increased by 109% in case of post cured, 120% in case of cold drink, 125% in case of artificial saliva but decreased by 70% in case of distilled water. The loss modulus was increased by 175% in case of post cured, 30% in case of cold drink, 50% in case of artificial saliva but decreased by 50% in case of distilled water. Further, minimum value of storage modulus was reported in case of distilled water medium followed by cold drink and then artificial saliva. Also, cold drink seems to be better medium than distilled water in terms of dynamic mechanical properties of dental composite. Graphical abstract Variation of storage modulus of sample kept in artificial saliva for 7 days Addition of 30 wt.% nano-ZnO increased the storage modulus by 109% in case of post cured, 120% in case of cold drink, 125% in case of artificial saliva but decreased by 70% in case of distilled water. Addition of 30 wt.% nano-ZnO increased the loss modulus by 175% in case of post cured, 30% in case of cold drink, 50% in case of artificial saliva but decreased by 50% in case of distilled water. Immersion of sample in each medium led to decrease in storage modulus but increase in Tan delta. Further, minimum value of storage modulus was reported in case of distilled water medium followed by cold drink and then artificial saliva. Cold drink seems to be better medium than distilled water in terms of dynamic mechanical properties of dental composite.
Highlights
Nowadays, experiments are being carried out to find a replacement of amalgam as an environmental concern
The finding of results indicated that on adding 30 wt.% nano-ZnO, the storage modulus was increased by 109% in case of post cured, 120% in case of cold drink, 125% in case of artificial saliva but decreased by 70% in case of distilled water
The loss modulus was increased by 175% in case of post cured, 30% in case of cold drink, 50% in case of artificial saliva but decreased by 50% in case of distilled water
Summary
Experiments are being carried out to find a replacement of amalgam as an environmental concern. Kumar et al developed and assessed physical, mechanical, thermomechanical properties of dental composite materials by modifying resin matrix, filler content/size, silane coupling agent, photo-polymerization system and light curing technique [1, 2]. Apart from elastic behavior, dental composite exhibits viscous due to presence of resin matrix For such viscoelastic materials, static mechanical tests cannot be used to determine viscous response of material. It has been reported that foods and drinks affect the behavior of dental materials During contact with these medium for long time, some fraction of fillers are separated from resin [13, 14]. Dynamic mechanical behavior of dental composites such as storage modulus, loss modulus and Tan delta of nano-ZnO reinforced dental composites for posterior teeth applications have been studied under three different medium such as cold drink, distilled water, and artificial saliva medium
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