Optical Stability of High-translucency Resin-based Composites

Abstract

SUMMARY This study investigated the stability of the optical properties of high-translucent shades of dental resin-based composites. Four commercial materials (Filtek Z350 XT, Opallis, Amelogen Plus, and IPS Empress Direct) and 14 non-Vita shades were tested. Disc-shaped specimens for each resin-based composite-shade combination (n=6) were evaluated at T0 (baseline), T1 (after 30 days of storage in water), and T2 (after 30 days of storage each in water and a coffee solution). Color measurements were performed according to the L′C′h′ color system. Translucency Parameter (TP) and CIEDE2000 color difference (ΔE00) were calculated. Data were statistically analyzed at α = 0.05. Baseline TP values varied from 43 ± 1 to 55 ± 1. Changes in TP at T1 varied from −3.0% (Opallis T-Neutral) to 4.2% (Amelogen Plus Trans Orange), with no major differences from T0. At T2, most resin-based composites showed significantly increased opacity, with changes varying between −15.0% (Empress Direct Trans 20) and −2.7% (Z350 XT Blue). However, the TP values were ≥40 throughout the study. Storage in water caused negligible color differences, with ΔE00 values at T1 ≤ 0.9 ± 0.6. At T2, all materials tested showed significant color difference, and ΔE00 ≥ 3.2 ± 0.2. The orange shades from Opallis and Amelogen Plus showed lower color variation than did the other shades. The most significant optical changes upon storage were detected in the hue and particularly the chroma color coordinate. In conclusion, the high-translucent resin-based composites showed large variability in the stability of their optical properties among the tested brands and different shades of the same material. Regardless of the storage condition, the tested resin-based composites retained their high-translucency character over time.

Avaliação do efeito da termociclagem nas propriedades ópticas e na rugosidade superficial de duas resinas compostas comerciais

“…Neste estudo, os resultados de translucidez das resinas compostas avaliadas foram semelhantes. A translucidez é uma propriedade óptica que pode influenciar a obtenção da cor adequada e consequentemente na estética, uma vez que materiais muito translúcidos podem causar a visualização de uma tonalidade acinzentada da restauração em comparação aos dentes hígidos adjacentes 59,60 . Alterações na translucidez após a polimerização e envelhecimento também foram observadas anteriormente na literatura 61 .…”

<p>Color stability of Lucirin-photo-activated resin composite after immersion in different staining solutions: a spectrophotometric study</p>

“…The addition of the sugar and milk group was added as some studies showed a difference in staining potentials of coffee when sugar or milk was added. 56 The higher staining potential of the coffee can be contributed to the presence of yellow staining molecules with high affinity to polymer molecules. [82][83][84] For the tea, the staining could be due to the presence of tannic acid and stains.…”

“…45,[49][50][51][52][53] The use of Lucirin eliminated the amine group, thereby increasing color stability upon aging. 25,45,48,[54][55][56] IPS Empress Direct (Ivoclar Vivadent, Schaan, Liechtenstein), a resin-based material, was introduced to the market. Utilizing the latest technology, the manufacturer of IPS composite added nano-fillers and the Lucirin TPO-initiator system to the compound to reduce the amount of CQ used, thereby reducing its yellowing effect.…”

Optical properties and masking capacity of flowable giomers

“…In addition to the primary color attributes (hue, lightness, and chroma), there are other, more subtle properties that can have a considerable impact on the final result (translucency, opacity, fluorescence, with translucency being the most important) [23][24][25].…”

“…It has been shown that the color coordinates of composites with the same designation, originating from different brands can be different. Several authors have shown that the color and translucency depend on the manufacturers and the shade classification [18,25,[27][28][29][30]. To the best of our knowledge, no research has been done to analyze the color and translucency parameter of different consistencies of flowable giomers.…”