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      Color Stability of Silicone or Acrylic Denture Liners: An in Vitro Investigation

      research-article
      Author(s): , DDS, PhD a , , DDS b
      Publication date (Print):
      Journal: European journal of dentistry
      Publisher: Dental Investigations Society
      Keywords: Silicone, Acrylic liners, Color stability

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          Abstract

          Objectives

          The aim of this study was to compare the color stability of three acrylic based hard liners (Ufi gel hard, Dura-Liner II, Tokuso Rebase) and two silicone based soft liners (Ufi gel permanent, Molloplast B) by using the colorimeter.

          Methods

          Sixty disc-shaped samples, with uniform size of 10 mm diameter and 2 mm in thickness were fabricated for each material. Thirty samples were made as control group in distilled water and the remaining thirty samples were weathered in accelerated aging chamber. Color measurements were made before and after distilled water and aging. Data were statistically analyzed using nonparametric Kruskal-Wallis and Mann-Whitney U tests.

          Results

          Data showed that there are significant differences among materials in both after distilled water and aging treatments (P<.001). These results indicated that the most discolored liner material was Dura Liner II after aging (ΔE*=16.30) and the least discolored material was Ufi gel permanent after distilled water (ΔE*=0.41).

          Conclusions

          Based on the results of this study, silicone based liner materials are considered to be more color stable than acrylic based liner materials.

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          Most cited references43

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          Evaluation of visual and instrument shade matching.

          Scott Okubo, Ali Kanawati, Mark W. Richards … (1998)
          Visual color matching to determine shades in dentistry is inconsistent and unreliable. If accurate, instrumental measurement of tooth color would provide objective, quantified data to match natural teeth to clinical shade guides. This study evaluated and compared the ability of a new computerized colorimeter and a simple visual test to match ceramic shade guide teeth. Thirty-one (n = 31) observers with normal color vision were allowed unlimited time to match one set of Vita Lumin shade guide teeth to the corresponding shade guide teeth of a second Vita Lumin shade guide. The same test was administered to 14 of the observers several months later to determine within-subject variability. A computerized colorimeter (Colortron II) equipped with a positioning guide was used to measure the middle third of each shade guide tooth. Through a "match tool" present in the computer's software, readings from one shade guide were matched with readings of the other shade guide by using CIELAB measurements and DeltaE values. The mean number of correct matches by the colorimeter and of correct matches in visual test were compared with a 1-tailed t test. Repeatability for both tests was determined with a paired t test. The Colortron II instrument correctly matched 8 of the 16 tabs (50% correct), whereas visual matching by examiners averaged 7. 7 of 16 correct matches (48% correct) (standard deviation 2.7). No statistically significant differences existed between the 2 methods. The colorimeter demonstrated 100% repeatability and the visual test demonstrated fair repeatability (correlation coefficient r =.60). Shade determination by visual means was inconsistent. Accuracy of a new colorimeter in matching porcelain shade guide teeth was only slightly better.
          Article 0 comments Cited 53 times – based on 0 reviews     Review now
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            Color stability of new-generation indirect resins for prosthodontic application.

            Marlis Douglas (2000)
            Several new-generation indirect resins are being advocated for full contour restoration of teeth. Previous indirect resin systems have failed in this application, due in part to color instability. This study evaluated and characterized the color stability of various new-generation indirect resins (ceramic-polymers) when subjected to accelerated aging. Four new-generation indirect resin systems, 1 direct resin system, and 1 dental porcelain control were subjected to accelerated aging for a period of 300 hours. Initial specimen color parameters were determined in the Commission International de l'Eclairage Lab (CIELAB) color order system with a colorimeter. Color changes (DeltaE) were calculated between baseline color measurements and measurements made after 150 and 300 hours of accelerated aging. Color difference data were subjected to a 1-way analysis of variance to examine the interaction between material and time interval of aging. Where significant interactions occurred, a least-squared means test was performed to identify differences in the color stability between the materials (P
            Article 0 comments Cited 27 times – based on 0 reviews     Review now
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              Comparative study of water sorption, solubility, and tensile bond strength of two soft lining materials.

              Amany El-Hadary, James Drummond (2000)
              Two soft denture lining materials with distinct chemical compositions were evaluated to determine whether these compositional variations manifest themselves in property differences. This study evaluated and compared the water sorption, solubility, and tensile bond strength of a recently introduced silicone-based soft liner (Luci-sof) and a plasticized acrylic resin soft liner (Permasoft) using 2 processing techniques, laboratory-processed and autopolymerized at chairside, for the latter. For water sorption and solubility testing, 24 disks (45 mm in diameter and 1 mm in thickness) were prepared for each group, stored in distilled water at 37 degrees C, and tested after 1, 4, and 6 weeks. The disks used for the first week were again tested after 4 and 6 weeks of continuous storage. Their weight was recorded and sorption and solubility were calculated using 2 methods. Two PMMA cylinders (25 mm in diameter, 25 mm in length), joined together by the soft liner, were used to determine the bond strength in tension at a loading rate of 2 mm/min after 48 hours and 12 weeks aging in distilled water. Permasoft had higher solubility (1.50% +/- 0.20% laboratory-processed and 1.42% +/- 0.16% autopolymerized at chairside) and sorption (2.45% +/- 0.36% laboratory-processed and 1. 76% +/- 0.08% autopolymerized at chairside) than Luci-sof (0.17% +/- 0.09% solubility and 0.41% +/- 0.17% sorption) after 6 weeks of aging. For tensile bond strength, there was no significant difference between each respective control and the 12-week bond strength for each material. However, Luci-sof (1.16 +/- 0.27 MPa) had a significantly higher tensile bond strength than Permasoft (0. 50 +/- 0.18 MPa laboratory-processed and 0.44 +/- 0.09 MPa autopolymerized at chairside). On the basis of lower water sorption and solubility and higher tensile bond strength, Luci-sof may provide better clinical success.
              Article 0 comments Cited 22 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Eur J Dent
                Journal ID (publisher-id): Eur J Dent
                Title: European journal of dentistry
                Publisher: Dental Investigations Society
                ISSN (Print): 1305-7456
                ISSN (Electronic): 1305-7464
                Publication date (Print): July 2007
                Volume: 1
                Issue: 3
                Pages: 144-151
                Affiliations
                [a ] Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Türkiye
                [b ] Research Assistant, Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Türkiye
                Author notes
                Corresponding Author: Dr. Gulfem Ergun, Address: Süslü sok. 14/9Tandoḡan/Ankara 06580 Türkiye, Tel.: +90 312 213 97 01, Fax: +90 312 223 92 26, E-mail : gulfem@ 123456gazi.edu.tr , ergungulfem@ 123456yahoo.com .
                Article
                Publisher ID: dent1_p144
                DOI: 10.1055/s-0039-1698330
                PMC ID: 2638246
                PubMed ID: 19212558
                SO-VID: 261c0334-537f-4d7d-a958-6eca558b88df
                Copyright © Copyright 2007 European Journal of Dentistry. All rights reserved.
                History
                Categories
                Subject: Original Articles

                ScienceOpen disciplines: Dentistry
                Keywords: acrylic liners,color stability,silicone
                Data availability:
                ScienceOpen disciplines: Dentistry
                Keywords: acrylic liners, color stability, silicone

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