Wolfgang Buchalla1, Thomas Attin, Ralf-Dieter Hilgers, Elmar Hellwig. 1. Department of Conservative and Preventive Dentistry and Periodontology, University Clinic for Dentistry, Georg-August University, Göttingen, Germany. bucalla@med.uni-goettingen.de
Abstract
STATEMENT OF PROBLEM: Internal discoloration may occur with the intraoral use of resin-based restoration materials. Water storage and light exposure influence the color properties of microfilled and hybrid composites. PURPOSE: The purpose of this study was to determine color and translucency changes in a hybrid and a microfilled composite after light exposure with and without water storage. MATERIAL AND METHODS: A hybrid (Tetric) and a microfilled composite (Silux Plus) were subjected to artificial daylight with and without water storage. Tristimulus Yxy values were determined colorimetrically against a black or a white background. Differences from baseline were calculated as Delta E*(ab) for up to 1 month. After 1 month, Delta L*, Delta a*, Delta b*, and the contrast ratio Delta C were calculated. Data were analyzed with 2-way analysis of variance (P<.05). RESULTS: The Delta E(ab)* increased over time for wet and dry stored specimens of both materials. Wet storage for 1 month resulted in significantly higher Delta E(ab)* and Delta C but lower Delta b* than dry storage. The Delta a* was significantly higher for Tetric compared with Silux Plus. Both materials showed negative Delta L* values under both storage conditions without significant differences between materials or storage conditions. CONCLUSION: The results of this in vitro study suggest that resin-based restoration materials undergo measurable changes due to daylight exposure. Increased changes occurred under the influence of water storage.
STATEMENT OF PROBLEM: Internal discoloration may occur with the intraoral use of resin-based restoration materials. Water storage and light exposure influence the color properties of microfilled and hybrid composites. PURPOSE: The purpose of this study was to determine color and translucency changes in a hybrid and a microfilled composite after light exposure with and without water storage. MATERIAL AND METHODS: A hybrid (Tetric) and a microfilled composite (Silux Plus) were subjected to artificial daylight with and without water storage. Tristimulus Yxy values were determined colorimetrically against a black or a white background. Differences from baseline were calculated as Delta E*(ab) for up to 1 month. After 1 month, Delta L*, Delta a*, Delta b*, and the contrast ratio Delta C were calculated. Data were analyzed with 2-way analysis of variance (P<.05). RESULTS: The Delta E(ab)* increased over time for wet and dry stored specimens of both materials. Wet storage for 1 month resulted in significantly higher Delta E(ab)* and Delta C but lower Delta b* than dry storage. The Delta a* was significantly higher for Tetric compared with Silux Plus. Both materials showed negative Delta L* values under both storage conditions without significant differences between materials or storage conditions. CONCLUSION: The results of this in vitro study suggest that resin-based restoration materials undergo measurable changes due to daylight exposure. Increased changes occurred under the influence of water storage.
Authors: Bora Bagis; Tamer Tüzüner; Sedanur Turgut; Fatih Mehmet Korkmaz; Özgül Baygın; Yıldırım Hakan Bağış Journal: ScientificWorldJournal Date: 2014-08-05