Abstract
There has been a great tendency toward using resin composite in dentistry and exploring nano-hardness, elastic modulus, and effect of polishing on its mechanical properties after its artificial ageing. This study aimed to evaluate the effect of surface polishing of four different resin composites on their nano-hardness and elastic modulus. This effect was tested right after light curing of composite resin and after its artificial ageing (immersion in alcoholic medium). Nanoindentation test preparations, surface roughness, surface hardness, and scanning electron microscope were conducted across the four different resin composites: Clearfil AP-X (APX), Estelite Sigma Quick (ESQ), Beautifil II (BE2), and FiltekTM Supreme Ultra Universal restorative (FSU). We found that difference in fillers load and particle size are amongst the factors influencing hardness and modulus of elasticity. The APX is the highest in term of hardness due to fillers load and size while the ESQ is the lowest because all fillers in nano size and distributed homogenously. The significance of surface polishing of the studied resin composite restorations was highlighted. Future research may focus on exploring survival rate of polished and non-polished composite surfaces with emphasis on measuring degree of conversion and impacts of polished and non-polished surfaces on the individuals’ oral health quality of life.
Highlights
In the recent years, composite resin has become an important cosmetic substitute for amalgam fillings as the restorative material of choice for discolored, fractured, chipped, and decayed teeth [1,2]
Composite resin consists of a mixture of resin medium with glass or quartz fillers, which provides it with a tooth-colored feature that improves dental aesthetics [2]
There was no significant difference between BE2 and FiltekTM Supreme Ultra Universal restorative (FSU) in all conditions
Summary
Composite resin has become an important cosmetic substitute for amalgam fillings as the restorative material of choice for discolored, fractured, chipped, and decayed teeth [1,2]. From a dental public health stance, composite resins in the oral cavity ought to provide dental aesthetics and functions; and improving the individuals’. One of the key techniques of measuring the hardness and resistance of composite resin is the Nanoindentation technique [4]. Nanoindentation technique is useful in understanding the mechanical properties of dental materials, apart from familiarity with chemical, biological, pathophysiological, and physical principles that contribute vitally to developing successful dental treatments [4,5]. This technique is applicable and imperative especially in defining the viability of applying composite resins in dental fillings
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