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      The Effect of Investment Materials on the Color of Feldspathic Ceramics

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          Abstract

          Objectives:

          The aim of this study was to evaluate the influence of investment type on the color of feldspathic ceramics.

          Methods:

          Ceramic specimens were constructed using the refractory die technique, using four investments (i.e., Vitadurvest, Duravest, Duceralay Superfit, and Fortune) to observe their effect on the color of five commercially available ceramics (i.e., Super Porcelain EX-3, Vision Esthetic, Vintage Halo, IPS Classic, and Vitadur Alpha). The color analysis of the ceramics was performed with a colorimeter using the CIE L*a*b* color coordinates.

          Results:

          The investments produced significant alterations on a*, b*, and L* color parameters of the ceramics tested. The ceramic Vision Esthetic was influenced by the type of investment in all color parameters (P<.05). Two investments (Duravest and Fortune) produced alterations in color parameters with three of the five ceramics tested.

          Conclusions:

          The investment materials produced alterations on the ceramic color parameters, resulting in unacceptable chromatic alterations (ΔE*).

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          Most cited references39

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          Assessment of appearance match by visual observation and clinical colorimetry.

          Judgments of appearance matching by means of the visual criteria established by the United States Public Health Service (USPHS) and by means of an extended visual rating scale were determined for composite resin veneer restorations and their comparison teeth. Using a colorimeter of 45 degrees/0 degrees geometry and the CIELAB color order system we used the color of the restorations and comparison teeth to calculate a color difference for every visual rating. Statistically significant relationships were found between each of the two visual rating systems and the color differences. The average CIELAB color difference of those ratings judged a match by the USPHS criteria was found to be 3.7. However, the overlap in ranges of the color differences for those comparisons rated matches and mismatches indicates the importance of other factors in appearance matching, such as translucency and the effects of other surrounding visual stimuli. The extended visual rating scale offers no advantages to the more broadly defined criteria established by the USPHS.
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            Evaluation of visual and instrument shade matching.

            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.
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              An overview of treatment considerations for esthetic restorations: a review of the literature.

              Controversy persists regarding the treatment planning criteria for esthetic restorations. This article reviews the literature regarding the biocompatibility, marginal adaptation, color matching, patient selection, technique sensitivity, and mode and rate of failure of tooth-colored restorations. A Medline search was completed for the period from 1986 to 2006, along with a manual search, to identify pertinent English peer-reviewed articles and textbooks. The key words used were amalgam, posterior composite resin, ceramic inlays/onlays, CEREC, porcelain laminate veneers, all-ceramic crowns, and all-ceramic fixed partial dentures.
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                Author and article information

                Journal
                Eur J Dent
                Eur J Dent
                Eur J Dent
                European Journal of Dentistry
                Dental Investigations Society
                1305-7456
                1305-7464
                October 2011
                : 5
                : 4
                : 433-440
                Affiliations
                [a ] Graduate Student, Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Brazil
                [b ] Associate Professor, Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Brazil
                Author notes
                Corresponding author: Tatiana Pereira-Cenci, School of Dentistry, Federal University of Pelotas Rua Gonçalves Chaves, 457, 2nd floor Pelotas - RS - Brazil 96015560, Phone/fax: +55 53 32226690, E-mail: tatiana.cenci@ 123456ufpel.tche.br
                Article
                dent05_p0433
                3352684
                22589582
                27990b0d-e95d-4d62-8b7a-6cea7b77af86
                Copyright 2011 European Journal of Dentistry. All rights reserved.
                History
                Categories
                Articles

                Dentistry
                investment,ceramic, color
                Dentistry
                investment, ceramic, color

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