Chromatic Influence of Value Resin Composites

Abstract

SUMMARYThe current study evaluated the chromatic influence of high, medium and low value composites on a dentin composite substrate (A2 shade) using spectrophotometric analysis. The specimens were divided into the following four groups: a) control (CG), entirely composed of dentin composite (n=5); b) high value (GHV), dentin composite and high value composite (n=20); c) medium value (GMV), dentin composite and medium value composite (n=20) and d) low value (GLV), dentin composite and low value composite (n=20). The dentin composite was 2.0 mm thick and the value composite was added in four different thicknesses, dividing the groups into four subgroups: S1 = 1.0 mm, S2 = 0.8 mm, S3 = 0.6 mm and S4 = 0.4 mm. The results were determined using the CIELAB system and differences in brightness of the specimens were analyzed using two-way ANOVA. Significant differences were found between different value resin composites, thicknesses and interactions, as revealed by the Tukey's test (HSD). Adding value composite produced lower brightness, and a gray shade was observed, compared to the control, regardless of the value or thickness of the primary composite. Eleven of the 12 subgroups presented clinically unacceptable chromatic changes, except when the 0.4 mm thickness of high value composite was used.

The influence of stratification on color and appearance of resin composites

“…The thickness of the specimens was kept constant and they were measured over two different backgrounds (white and black), as color perception is dependent on sample thickness [25][26][27], opacity [28] and background [29]. According to Ardu et al [17], white background represents the clinical situation of a class III or class V restorations, where composite overlaps a residual part of natural enamel and, eventually, dentin.…”

Influence of background on natural tooth colour coordinates: an in vivo evaluation

“…Their clinical success is related to their ability to mimic tooth appearance in terms of gloss [1], microtexture [2,3] and colour [4]. Various elements such as illuminant source [5], surface roughness [6], sample thickness [7] and background colour [8] influence colour perception.…”

Evaluation of a technique for color correction in restoring anterior teeth

“…In test teeth the A3.5 and A4 shades were selected to simulate unsatisfactory color restoration with two intensities: moderate and severe (in comparison with A3 test tooth). For color correction, the technique was applied in three depths of preparation, the deepest not more than 1 mm because studies show that the use of enamel composite resin in large thicknesses imparts a grayish appearance to the restoration because of the reduction in their translucency and lightness . Optical effects were reproduced by preparing the incisal third with a diamond bur, setting the mamelons and retaining a thickness of 0.5 mm of palatal resin.…”

“…For color correction, the technique was applied in three depths of preparation, the deepest not | 313 more than 1 mm because studies show that the use of enamel composite resin in large thicknesses imparts a grayish appearance to the restoration because of the reduction in their translucency and lightness. 7,27,28 Optical effects were reproduced by preparing the incisal third with a diamond bur, setting the mamelons and retaining a thickness of 0.5 mm of palatal resin. As the dentin resin is translucent, its use in a thin layer allows the passage of light.…”