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  1. Article ; Online: Over 15 MA/cm

    Majkic, Goran / Pratap, Rudra / Xu, Aixia / Galstyan, Eduard / Selvamanickam, Venkat

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 6982

    Abstract: An Advanced MOCVD (A-MOCVD) reactor was used to deposit 4.8 µm thick (Gd,Y)BaCuO tapes with 15 mol% Zr addition in a single pass. A record-high critical current density ( ... ...

    Abstract An Advanced MOCVD (A-MOCVD) reactor was used to deposit 4.8 µm thick (Gd,Y)BaCuO tapes with 15 mol% Zr addition in a single pass. A record-high critical current density (J
    Language English
    Publishing date 2018-05-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-25499-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: J

    Xu, A / Zhang, Y / Gharahcheshmeh, M Heydari / Yao, Y / Galstyan, E / Abraimov, D / Kametani, F / Polyanskii, A / Jaroszynski, J / Griffin, V / Majkic, G / Larbalestier, D C / Selvamanickam, V

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 6853

    Abstract: A main challenge that significantly impedes ... ...

    Abstract A main challenge that significantly impedes REBa
    Language English
    Publishing date 2017-07-31
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-06881-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Development of a model shade guide for primary teeth.

    Paravina, R D / Majkic, G / Stalker, J R / Kiat-Amnuay, S / Chen, J W

    European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry

    2008  Volume 9, Issue 2, Page(s) 74–78

    Abstract: Aim: Large disparities in colour ranges and distribution between primary and permanent teeth make shade guides for permanent teeth unsuitable for primary teeth applications. The aim of the study was to develop a model shade guide for primary teeth.: ... ...

    Abstract Aim: Large disparities in colour ranges and distribution between primary and permanent teeth make shade guides for permanent teeth unsuitable for primary teeth applications. The aim of the study was to develop a model shade guide for primary teeth.
    Study design: The Vita Easyshade intraoral spectrophotometer was used to determine colour at the middle labial/buccal third surface of 612 primary teeth of 102 patients.
    Methods: Model shade guides, containing 1-16 tabs, were designed in CIELAB (DeltaE*) and CIEDE2000 (DeltaE') colour difference formulae using nonlinear optimization. The coverage error (DeltaECOV) was calculated as the mean of minimal colour differences between each of primary teeth and the "closest" shade tab. Results were analyzed using descriptive and analytical statistics.
    Results: The coverage error of Vitapan Classical shade guide applied to the primary teeth evaluated was 4.2 (SD +/- 1.8). DeltaE*COV and DeltaE'COV values for model shade guides with 16 tabs were 1.8 and 1.3, respectively. The CIELAB coverage error of the model shade guide containing two tabs outperformed DeltaE*COV of Vitapan Classical.
    Conclusions: As compared with Vitapan Classical shade guide, significantly smaller coverage error was obtained in the model shade guide with the same number of tabs, designed via constrained nonlinear optimization.
    MeSH term(s) African Americans ; Child ; Child, Preschool ; Color ; Cuspid/anatomy & histology ; Databases as Topic ; Dental Prosthesis Design/instrumentation ; European Continental Ancestry Group ; Female ; Hispanic Americans ; Humans ; Incisor/anatomy & histology ; Male ; Molar/anatomy & histology ; Optics and Photonics ; Prosthesis Coloring/instrumentation ; Spectrophotometry/instrumentation ; Tooth Crown/anatomy & histology ; Tooth, Deciduous/anatomy & histology
    Language English
    Publishing date 2008-06-04
    Publishing country England
    Document type Comparative Study ; Journal Article
    ZDB-ID 2472851-2
    ISSN 1996-9805 ; 1818-6300
    ISSN (online) 1996-9805
    ISSN 1818-6300
    DOI 10.1007/BF03262613
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6730: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  4. Article: Optimization of tooth color and shade guide design.

    Paravina, Rade D / Majkic, Goran / Imai, Francisco H / Powers, John M

    Journal of prosthodontics : official journal of the American College of Prosthodontists

    2007  Volume 16, Issue 4, Page(s) 269–276

    Abstract: Purpose: One critical prerequisite for dental shade guides is to match the color range and distribution of human teeth. The purpose of this study was to design computer models for dental shade guides and compare them with an existing shade guide. A ... ...

    Abstract Purpose: One critical prerequisite for dental shade guides is to match the color range and distribution of human teeth. The purpose of this study was to design computer models for dental shade guides and compare them with an existing shade guide. A targeted coverage error for a newly developed shade guide was DeltaE(ab) < 2 with a corresponding CIE2000 value.
    Materials and methods: A total of 1064 teeth were evaluated in vivo using an intra-oral spectrophotometer. Shade guide models were designed using different methods for representation of the data set, hierarchical clustering, and nonlinear constrained optimization. Coverage error was calculated for both CIELAB and CIE2000 values. Recorded values were compared with coverage error of Vitapan Classical (VC) shade guide. Wilcoxon signed-rank test for paired samples and linear regression were used in statistical analysis.
    Results: Coverage error of VC was 4.1 (SD 1.8), ranging from 0.5 to 11.5 DeltaE(ab). Group A shades had the best match for human teeth (43.9%) followed by Groups C (24.1%), B (20.4%), and D (11.7%) shades, respectively. CIELAB coverage error of the newly designed 24-tab shade guide using clustering and optimization was 2.05 (0.95) and 1.96 (0.92), respectively. Corresponding CIE2000 coverage error values were 1.43 (0.68) and 1.40 (0.65), respectively. A significant difference between results obtained using clustering and optimization was determined. CIELAB color differences were greater, but highly correlated as compared with their CIE2000 counterparts (DeltaE(00)= 0.64 x DeltaE(76)+ 0.13, r > 0.99).
    Discussion: This study demonstrated that, compared with existing shade guides, future shade guides can provide either (a) similar coverage of tooth color with fewer tabs, thus simplifying shade matching procedure, or (b) better coverage of tooth color with a similar number of tabs, in both cases increasing the chances of satisfactory matches and, consequently, better esthetics.
    Conclusions: Both clustering and optimization enabled better representation of tooth color as compared with an existing dental shade guide. Optimization outperformed clustering and is therefore recommended as a method of choice for representation of tooth color and designing of dental shade guides.
    MeSH term(s) Algorithms ; Cluster Analysis ; Color ; Colorimetry ; Computer Simulation ; Dental Prosthesis Design/instrumentation ; Esthetics, Dental ; Humans ; Models, Biological ; Nonlinear Dynamics ; Prosthesis Coloring/instrumentation ; Spectrophotometry ; Tooth/anatomy & histology
    Language English
    Publishing date 2007-07
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 1197213-0
    ISSN 1059-941X
    ISSN 1059-941X
    DOI 10.1111/j.1532-849X.2007.00189.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4029: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article ; Online: Color difference thresholds of maxillofacial skin replications.

    Paravina, Rade D / Majkic, Goran / Del Mar Perez, Maria / Kiat-Amnuay, Sudarat

    Journal of prosthodontics : official journal of the American College of Prosthodontists

    2009  Volume 18, Issue 7, Page(s) 618–625

    Abstract: Purpose: The purpose of this study was to determine perceptibility and acceptability thresholds for color differences in light and dark skin-colored maxillofacial elastomers.: Materials and methods: A total of 15 pairs of light specimens (mimicking ... ...

    Abstract Purpose: The purpose of this study was to determine perceptibility and acceptability thresholds for color differences in light and dark skin-colored maxillofacial elastomers.
    Materials and methods: A total of 15 pairs of light specimens (mimicking white, Asian, and Hispanic skin) and 15 pairs of dark specimens (mimicking African-American skin) were made using skin-colored maxillofacial silicone elastomers, combined with opacifiers and pigments. Color match/mismatch and acceptable/unacceptable mismatch of each pair of specimens were visually evaluated by 45 evaluators under controlled conditions of a viewing booth. Color differences were calculated using CIELAB and CIEDE2000 formulae. After calculating the model parameters, receiver operating characteristics (ROC) curves and area under the ROC curve (AUC) were analyzed. Repeated measures ANOVA and Tukey's HSD test were used in a statistical analysis (alpha= 0.05).
    Results: CIELAB/CIEDE2000 perceptibility and acceptability thresholds for light specimens were 1.1/0.7 and 3.0/2.1, respectively. Corresponding values for dark specimens were 1.6/1.2 and 4.4/3.1, respectively. Differences in primary specimen color and type of threshold were found to be significant (p < 0.001). Only the primary specimen color effect was found to be significant in AUC comparisons.
    Conclusions: Within the limitations of this study, both main effects of threshold type (perceptibility and acceptability) and primary color (light and dark) on 50:50% color-difference thresholds of colored maxillofacial elastomers were found significant for both color-difference formulae used (CIELAB, CIEDE2000). In addition, significant interaction between the two main effects was found, indicating a stronger effect of skin type on acceptability than perceptibility thresholds. Primary specimen color (light vs. dark) was found to be the only significant main effect on the AUC of ROC curves constructed from logistic regression.
    MeSH term(s) Analysis of Variance ; Color Perception ; Colorimetry/methods ; Differential Threshold ; Humans ; Maxillofacial Prosthesis ; Observer Variation ; Prosthesis Coloring/standards ; ROC Curve ; Silicone Elastomers ; Statistics, Nonparametric
    Chemical Substances Silicone Elastomers
    Language English
    Publishing date 2009-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1197213-0
    ISSN 1532-849X ; 1059-941X
    ISSN (online) 1532-849X
    ISSN 1059-941X
    DOI 10.1111/j.1532-849X.2009.00465.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4029: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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