Masking of temperature-induced color changes in a thermo-sensitive fiber post

Alessandro Vichi*, Remo Schiavetti, Eduardo Pacifici, Agustino Giovannetti, Cecilia Goracci, Marco Ferrari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purposes: To evaluate (1) the efficacy of the color changing technology featured by DT Light Illusion Post aimed at safely identifying the post in case of re-treatment, and (2) the efficacy of a resin composite layer to mask the post if color shift occurs due to cold food and beverages. 

Methods: Five "master disks" of 3 mm of thickness were prepared by embedding in a resin composite four thermo-sensitive posts and one translucent post (control) cut in bars. Disks of resin composite in 0.5/1.0/1.5 mm thickness were prepared as well. Digital images were taken of the master disks with and without the overlying of the resin composite disks, at 5°C and at 35°C temperature. By the use of Adobe Photoshop "layering function" and "multi-layer option", differences in color were calculated between the post-free and the post-containing areas. 

Results: The differences between the resin color and post color were remarkably higher when the temperature was 5°C, showing that the technology of color change of the post was effective. With resin disk overlaid, at 35°C none of the differences in color were above the threshold for clinical acceptability. At 5°C blue and black colored posts were visible when the overlaid resin thickness was 0.5 mm, while at 1.0 mm and 1.5 mm none of the posts were visible.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalAmerican Journal of Dentistry
Issue number2
Publication statusPublished - 1 Apr 2012


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