Evaluating the Color Change of Different Types of Composite Resins Subjected to Zoom!® in-Office Bleaching

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چکیده

Beauty is a combination of qualities that delight the sight, other senses or the mind. Today, because of recent introduction and production of materials science and sophisticated dental techniques, better esthetics & improved durability of a restoration is achieved. It was found that color maintenance throughout the functional lifetime of restorations which is an indicator for the durability of a treatment. In addition color match is one of the most important characteristics of esthetic restorative materials [1,2]. Esthetic materials are now placed with minimal invasive techniques, to restore lesions or discolored teeth used to be treated previously with different approaches including crowns, direct and indirect veneers or most conservatively by bleaching [3]. The public as a conservative and economical method of improving the tooth appearance has received bleaching systems. Currently several bleaching systems are introduced in the market involving in-office bleaching, home-bleaching and overthe counter bleaching products [4-6]. Chemical methods are most recommended for tooth bleaching. Hydrogen peroxide is a common bleaching agent usually used for in-office treatment with high concentration (30-35%). Several studies have indicated a morphologic change in the tooth surface after treatment with 10% carbamide peroxide or 30% hydrogen peroxide bleaching systems [7-9]. Others indicated that these chemicals did not affect the sound tooth surface morphology [10-13]. However, the restored teeth should be considered in the investigations. A limited number of studies have reported the color change of tooth-colored restorative material due to bleaching treatments. These studies used varied concentrations of bleaching products, durations of exposure and testing materials [14,15]. The type of an esthetic restoration in terms of composition, organic and inorganic phase has been detected as a crucial factor for the degree of color and surface alternations induced by the bleaching products [16-22]. Resin materials, which are the most commonly used esthetic restorations, are especially more prone to chemical alternation compared to inert metal or ceramic [23,24]. Composite resins tend to discolor teeth due to their resin matrix, hydrophilicity and water adsorption properties. Previous studies have reported that the color changes of composites resulting from 10% carbamide peroxide were similar to those of the composites stored in water and were undetectable to the human eye [14,15]. Thus, composites with their excellent aesthetic properties may change their initial color over time because of surface and marginal staining, as well as, internal material deterioration [25]. However many reports concerning the effect of in-office bleaching on natural teeth and its effects on tooth colored composite resins are not yet fully explained [26]. Discoloration had been evaluated with various instruments as instrumental colorimetric and stereomicroscope using the CIE (Comission Internationale de l’Eclai-rage) L* a* b* color system, which is developed for characterization of colors based on human perception [27]. This system expresses ΔE as a relative color change between successive color measurements. It Volume 9 Issue 1 2018

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تاریخ انتشار 2018