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Optical Stability of High-translucent Resin-based Composites.

08:00 EDT 12th April 2019 | BioPortfolio

Summary of "Optical Stability of High-translucent Resin-based Composites."

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 T (baseline), T (after 30 days of storage in water), and T (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 (Δ E) were calculated. Data were statistically analyzed at α = 0.05. Baseline TP values varied from 43 ± 1 to 55 ± 1. Changes in TP at T varied from -3.0% (Opallis T-Neutral) to 4.2% (Amelogen Plus Trans Orange), with no major differences from T. At T, 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 Δ E values at T ≤ 0.9 ± 0.6. At T, all materials tested showed significant color difference, and Δ E ≥ 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.

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This article was published in the following journal.

Name: Operative dentistry
ISSN: 1559-2863
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Dentistry
Dentistry is the study, management and treatment of diseases and conditions affecting the mouth, jaw, teeth and their supporting tissues (Oxford Medical Dictionary) The work of a dentist ranges from regular patient check-up to orthodontics and surgery....


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