Understanding Color

Paravina, Rade D.

doi:10.1002/9781119272946.ch10

Cited by 5 publications

(4 citation statements)

References 47 publications

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“…The results of the present study are consistent with a previous study by Wee et al (15) in which variation of color among intended matched shades and fabricated shades of dental porcelain were evaluated using the same visual shade matching systems and a different instrumental shade matching device. The results are also consistent with another study (30) where color matches among extracted teeth and final fabricated porcelain shade tabs were assessed by examiners using the same shade evaluation techniques used in the present study.…”

Section: Discussionsupporting

confidence: 92%

“…Light from the illuminant travels into and exits off the translucent material. Accordingly, reflectance is assessed with the observation light pathway, and a portion of the illuminant go back into the window, then some of the signal is lost (29,30). Furthermore, different readings could be noted in the same 1-2 mm distance of sample, due to the instrument's extreme accuracy, which could deceive qualified clinicians (10).…”

Section: Discussionmentioning

confidence: 99%

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Color Duplication in Lithium Disilicate Restorations Fabricated by Cad-Cam Using Visual and Instrumental Shade Matching Systems

Rashidy

Hammad

Aboushady

2021

Alexandria Dental Journal

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INTRODUCTION:Color reproduction is one of the most challenging issues encountered by clinicians because of the complexity of visual properties of natural teeth. OBJECTIVES:This study aimed to assess color differences among intended and fabricated shades of lithium disilicate restorations fabricated by CAD-CAM after using visual and instrumental shade matching systems. MATERIALS AND METHOD:IPS Emax CAD blocks measuring (12.4mm width x 14.5mm length x 18 mm thickness) were cut under continuous water irrigation using diamond-impregnated slicing wheels mounted on a slow-speed saw microtome (Isomet; Buehler) to yield 16 rectangular specimens measuring (12.4 x 14.5x 1.5 mm). Then they were subjected to the crystallization cycle. Then IPS Emax glaze paste was applied with uniform thickness onto the crystallized specimen surface. Each master disk represented the color of a shade guide tab in the Vita Classic (16 shades). Shade selections for these master disks were carried out following visual and instrumental methods. Accordingly, 16 visual and 16 instrumental experimental disks were fabricated. Af e a al i , c l diffe e ce ( E) between the master and the fabricated ceramic discs were measured using the equation. RESULTS:On comparing Visual Emax CAD and instrumental Emax CAD, the mean( E) for visual (2.96 ±1.90) was lower than the mean( E) for instrumental (22.22 ±4.73) with a significant difference between them p<0.001. CONCLUSIONS:Visual shade selection using classical shade guide showed lower delta E than that of instrumental shade matching using Easyshade.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Color Duplication in Lithium Disilicate Restorations Fabricated by Cad-Cam Using Visual and Instrumental Shade Matching Systems

Rashidy

Hammad

Aboushady

2021

Alexandria Dental Journal

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“…The increase in L* value seen in the two groups can be interpreted as an increase in brightness. 40 The discrepancy may be due to the different brands of the zirconia block used and the use of squareshaped samples instead of full-contour zirconia in their study, unlike our study.…”

Section: Discussioncontrasting

confidence: 58%

“…This decrease in b* value can be interpreted as the color of the Ice group getting closer to blue. 40 The L* value was significantly increased by acceleration of sintering in the Wieland and Ice groups, whereas there was no significant change in the Prettau group. The increase in L* value seen in the two groups can be interpreted as an increase in brightness.…”

Section: Discussionmentioning

confidence: 85%

The Effect of Sintering Procedures on Fit and Color in Zirconia Crowns

Albayrak

Eraslan

Temizkanli

et al. 2022

Journal of Advanced Oral Research

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Purpose: The aim of this study was to examine the effects of various sintering procedures on the color parameters, marginal, and internal fit of zirconia crowns. Materials and Methods: Overall, 60 zirconia crowns were produced using 3 distinct zirconia blocks (Wieland Zenostar, Zirkonzahn Ice Translucent, and Zirkonzahn Prettau). For the sintering procedure of the crowns, six groups were created as follows: Wieland-Standard, Wieland-Speed, Ice-Standard, Ice-Speed, Prettau-Slow, and Prettau-Standard programs. The crowns were assigned into groups ( n = 10 in each group). The color parameters, marginal fit, and internal fit of the crowns were evaluated. The normality of data distribution was evaluated with the Kolmogrov–Smirnov test. Two independent samples t-test and Mann–Whitney U test were used to compare the sintering groups. Results: Acceleration of sintering caused a significant change in the color parameters of the Wieland and Ice groups but not in the Prettau group. In the Wieland group, marginal ( p = .047) and internal ( p = .004) gap values of speed sintering were found to be significantly lower than those in standard sintering. In the Ice group, the marginal gap values of speed sintering were found to be significantly lower than those in standard sintering ( p = .019). In the Prettau group, the marginal gap values of standard sintering were found to be significantly higher ( p = .035) than those in slow sintering. Conclusions: It was concluded that the effects of sintering procedures on color parameters, and internal and marginal fit of zirconia crowns were clinically insignificant. Speed sintering can be recommended for zirconia restorations.

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Comparison between direct and indirect “digital image” dental visual shade matching considering the effect of clinical experience and gender

Makhloota,

Köroğlu,

Turhan Bal

et al. 2024

J Esthet Restor Dent

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IntroductionShade matching is an essential procedure to obtain an esthetic prosthesis. The Direct Visual Shade Matching (DSM) method using shade guides is the most used method by dentists. However, The Indirect Visual Digital Shade Matching (ISM) method based on digital imaging is concerned to be reliable and useful in determining shade matching in dental practice. Several factors such as method, clinical experience, and gender can affect the success of shade matching.Aim of the StudyThis study aimed to compare these two methods and evaluate the effect of experience and gender on the results.Materials and MethodsThree volunteers' maxillary central incisor teeth were evaluated using (DSM) and (ISM) methods by 87 examiners (42 males, 45 females). These examiners were further divided into three groups based on their clinical experience: Undergraduate Preclinical Dental Students (UPDS) with 31 examiners, Undergraduate Clinical Dental Students (UCDS) with 34 examiners, and Postgraduate Dental Students from the Department of Prosthodontics (PDS) with 22 examiners. The spectrophotometer device results of three teeth were considered as a reference for shade matching. Statistical analyses of the data were performed using Kruskal–Wallis, Mann–Whitney U, and Chi‐square tests.ResultsNo significant difference was found between indirect and direct methods according to Perfect Matches (p > 0.05). However, according to Shade Matching Deviation Score (SMDS) values a statistically significant difference was found between the two methods where the best result was obtained with the ISM method (p < 0.05). There was a significant difference between the PDS group and the other two groups in terms of clinical experience (p < 0.05). There was no significant difference between gender groups (p > 0.05).ConclusionDigital images, captured under standardized lighting conditions, may serve as a reliable alternative method for direct shade matching. The (ISM) method requires a camera, related accessories, and computer skills. However, as these tools are commonly available nowadays, the focus for practitioners should be on effectively learning and applying these tools to achieve the best results. While clinical experience plays a significant role in the shade matching process, gender does not appear to have a substantial influence.Clinical SignificanceThis study found no significant differences between the (DSM) and (ISM) methods, leaving the clinical relevance of this method open to debate. However, the ISM method yielded superior responses. Despite requiring specialized tools, conditions, and training, the widespread use of cameras and computers in modern clinics makes the necessary equipment and software readily available. This method enhances clinician‐technician communication, potentially improving prosthesis esthetics and patient satisfaction, especially for less experienced clinicians or those with color deficiencies. Further research is crucial to determine its clinical significance.

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Understanding Color

Cited by 5 publications

References 47 publications

Color Duplication in Lithium Disilicate Restorations Fabricated by Cad-Cam Using Visual and Instrumental Shade Matching Systems

Color Duplication in Lithium Disilicate Restorations Fabricated by Cad-Cam Using Visual and Instrumental Shade Matching Systems

The Effect of Sintering Procedures on Fit and Color in Zirconia Crowns

Comparison between direct and indirect “digital image” dental visual shade matching considering the effect of clinical experience and gender

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