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      Impact of Bleaching before or after Veneer Preparation on Color Masking Ability of Laminate Veneers: An In Vitro Study

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          Abstract

          Purpose

          This study evaluates the effect of bleaching before or after veneer preparation and the depth of preparation on color masking ability of laminate veneers . Methods. Sixty extracted premolars were artificially stained to vita shade A4, verified by digital spectrophotometer (Vita Easy Shade V), and then divided into three groups: NB = nonbleached, BBP = bleaching before preparation, and BAP = bleaching after preparation. Based on the preparation depths, each group was further divided into two subgroups: S1 = 0.5 mm and S2 = 1.0 mm. BBP and BAP were subjected to one session of in-office bleaching using 35% hydrogen peroxide. IPS e-max CAD veneers of 0.5 and 1.0 mm thickness (corresponding to the preparation depths) of the same shade and translucency (HT A1) were cemented immediately to the bleached surfaces. Immediately after cementation, the color change Δ E between the baseline (after staining) and the resulted shades was measured using the Vita Easy Shade V digital spectrophotometer and CIELab color system.

          Results

          Bleached groups exhibited a significant Δ E value compared to the nonbleached group ( p < 0.05). BAP showed the highest Δ E value. No significant difference was found between BBP and BAP. S2 revealed a significant Δ E value than S1 ( p < 0.05). No significant difference was found between S1of BAP and S2 of NB, BBP, and BAP ( p > 0.05). Regarding the color coordinates, the difference between the tested groups was highly significant in lightness (ΔL∗) ( p < 0.001), while no significant differences were found in green/red value (Δ a∗) and yellow/blue value (Δ b∗) ( p > 0.05).

          Conclusions

          In cases of severe tooth discoloration, one session of in-office bleaching before or after veneer preparation and the preparation depth do not influence the color masking ability of laminate veneers.

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          Most cited references40

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          Visual and instrumental colorimetric assessments of small color differences on translucent dental porcelain.

          The CIELAB colorimetric system was used for the study of the relationship between measured color difference values and human observer responses. This study verified that a specific, visually meaningful and precise relationship exists between the magnitude and direction of the measurements and the average dental-observer responses. The results support the use of this system in dentistry as a means of evaluating color by differences. The further development of such systems for clinical use would be warranted and could serve as a valuable tool for material selection and restoration design, particularly in the area of aesthetic restorative dentistry.
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            Development and evaluation of a method in vitro to study the effectiveness of tooth bleaching.

            To develop and evaluate a reproducible intrinsic discolouration model in vitro, based on tea, which would allow the effectiveness of bleaching to be evaluated. The crown portions of extracted human third molars were sectioned bucco-lingually in half. Colour assessments were made at baseline, post staining and post whitening using a standard clinical shade guide (SG), a shade vision clinical colorimeter system (SVS) and a reflectance chromometer. Internal staining employed a standard tea solution into which groups of five specimens were placed from 1 to 6 days. All assessments demonstrated maximum staining within one day. Groups of stained specimens were exposed to 1. Water (placebo control) 2. Enamel polished 3. Enamel polished and bleached through enamel 4. Bleached through enamel 5. Bleached through dentine 6. Bleached through enamel and dentine 7. Exposed to the bleach vehicle (minus active control). Control and bleach gel treatments were for 30 min. Comparisons of treatment effects were made using unpaired t-test on groups selected a priori for analysis. SG and SVS revealed that control and polish treatments had no or little effect respectively on tooth shade but all bleach treatments produced marked and statistically significant whitening effects and to a similar magnitude. Bleaching treatments returned the majority of specimens to the original shade or beyond representing a SG mean change of 13.8-15 shade guide units (SGU). Chromometer readings were consistent except that polishing alone increased tooth lightness slightly. Teeth were reproducibly stained internally, to provide a model in vitro by which to evaluate bleaching. The model, could be used to study many aspects of vital tooth bleaching, but has the limitation, without in vivo or in situ data, of cautiously extrapolating the effects in vitro to outcome clinically.
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              In-office dental bleaching with light vs. without light: A systematic review and meta-analysis

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                Author and article information

                Contributors
                Journal
                Biomed Res Int
                Biomed Res Int
                BMRI
                BioMed Research International
                Hindawi
                2314-6133
                2314-6141
                2021
                27 April 2021
                : 2021
                : 6611173
                Affiliations
                Conservative Department, College of Dentistry, University of Sulaimani, Iraq
                Author notes

                Academic Editor: Du-Hyeong Lee

                Author information
                https://orcid.org/0000-0002-1447-3146
                https://orcid.org/0000-0002-3708-5461
                https://orcid.org/0000-0002-5318-3176
                Article
                10.1155/2021/6611173
                8099513
                e9cc2ba8-8f06-480d-a762-941015fba304
                Copyright © 2021 Gollshang Ahmad Mhammed Dalloo et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 26 December 2020
                : 26 March 2021
                : 15 April 2021
                Categories
                Research Article

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