Is it possible to determine the optical properties of resin composites with clinical spectrophotometers?

Soares, Karla Danielly Alves; Bragança, Rafaella Mariana Fontes de; Leal, Pollyana Caldeira; Schneider, Luís Felipe Jochims; Faria-e-Silva, André Luís

doi:10.1002/col.22757

Cited by 5 publications

(7 citation statements)

References 23 publications

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“…A bench spectrophotometer was utilized due to the inability of the clinical spectrophotometer to measure colors beyond the range of typical tooth shades. 21 …”

Section: Methodsmentioning

confidence: 99%

Influence of repositioning guides’ color and usage on precision in tooth color measurement with a clinical spectrophotometer

SANTANA,

SILVA,

SANTANA

et al. 2024

J. Appl. Oral Sci.

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Repositioning guides are commonly employed in clinical studies to ensure consistent tooth color measurements. Yet, their influence on measured color remains uncertain. Objective This study evaluated the impact of repositioning guides’ color and usage on tooth color measurement using a clinical spectrophotometer. Methodology In total, 18 volunteers participated in this study, in which the color of their upper left central incisor and upper left canine was measured with or without repositioning guides (control). The guides were made from pink, blue, or translucent silicone, as well as an acetate-based bleaching tray. Tooth color was measured in triplicates using a clinical spectrophotometer based on the CIELAB system. The standard deviations of these readings were used to estimate reproducibility, and color differences (ΔE00) between the measurements with guides and the control were calculated. Results Repositioning guides had a minimal effect on L* values and no effect on b* values. The use of pink silicone increased a* values, whereas blue or translucent silicone reduced them. Irrespective of the evaluated tooth, the lowest ΔE00 values were observed for the translucent silicone and bleaching tray. The usage of guides only affected data variability for the L* color coordinate. Conclusion Using repositioning guides can significantly impact the precision of tooth color measurement with a clinical spectrophotometer.

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“…A bench spectrophotometer was utilized due to the inability of the clinical spectrophotometer to measure colors beyond the range of typical tooth shades. 21 …”

Section: Methodsmentioning

confidence: 99%

Influence of repositioning guides’ color and usage on precision in tooth color measurement with a clinical spectrophotometer

SANTANA,

SILVA,

SANTANA

et al. 2024

J. Appl. Oral Sci.

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“…The camera was set at manual mode with an aperture of F20, shutter speed of 1/125 s, ISO 3200, and without flashlight. The specimens were imaged over both a neutral gray background and a single specimen of Forma composite, with no coupling agent placed between the specimen and backgrounds 21,22 …”

Section: Methodsmentioning

confidence: 99%

“…The specimens were imaged over both a neutral gray background and a single specimen of Forma composite, with no coupling agent placed between the specimen and backgrounds. 21,22 The images were imported into Adobe Photoshop Lightroom Classic software (Adobe Systems, San José, CA, USA) and the white balance was adjusted based on the neutral gray background of the images. The images were then opened in CorelDraw Graphics Suite X8 software (Corel Corporation, Ottawa, ON, Canada), and measurement areas were delimited.…”

Section: Color Measurement Of Specimen Imagesmentioning

confidence: 99%

The role of interface distance and underlying substrate on the color adjustment potential of single‐shade composites

de Livi,

Santana,

Bragança

et al. 2023

J Esthet Restor Dent

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ObjectiveThis study assessed how the distance from the composite interface and the underlying chromatic substrate affect the color adjustment potential (CAP) of two single‐shade composites.Materials and MethodsCylinder‐shaped specimens were created using Vittra APS Unique (VU), Charisma Diamond One (DO), and a shaded (A3) composite. Some single‐shade specimens were surrounded by the A3 composite, forming dual specimens. Color measurements of simple specimens were taken against a gray background using a spectrophotometer. All specimens were positioned at a 45° angle in a viewing booth under illuminant D65, and images were captured with a DSLR camera against gray or A3 backgrounds. Image colors were measured using image processing software and converted to CIELAB coordinates. Color differences (ΔE00) between the single‐shade composites and the A3 composite were calculated. CAP was determined by comparing data from simple and dual specimens.ResultsNo clinically significant differences were observed between color measurements obtained from images and the spectrophotometer. CAP was higher for DO compared to VU and increased as the distance from the composite interface decreased and when specimens were positioned against an A3 background.ConclusionThe color adjustment potential increased with decreased distance from the composite interface and against a chromatic background.Clinical SignificanceAchieving satisfactory color match in restorations using single‐shade composites is crucial, and selecting an appropriate underlying substrate is essential. The color adjustment gradually decreases from the restoration margins towards its center.

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“…No coupling agent was placed between the specimen and backgrounds. 18,19 Color measurement of specimen images Images from the specimens were also taken using a CCD camera (Axiocam ERc 5s, Zeiss, Thornwood, USA) attached to a stereoscopic loupe (Zeiss Stemi 2000-C, New York, USA). The specimens were illuminated with a tungsten-halogen lamp.…”

Section: Reference Color Measurementsmentioning

confidence: 99%

Reliability of the color measurement of resin composites using images obtained using a stereoscopic loupe

ALBUQUERQUE,

BRAGANÇA,

PECHO

et al. 2024

Braz. oral res.

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This study assessed the reliability of a color measurement method using images obtained from a charge-coupled device (CCD) camera and a stereoscopic loupe. Disc-shaped specimens were created using the composite Filtek Z350 XT (shades DA1, DA2, DA3, and DA4) (n = 3). CIELAB color coordinates of the specimens were measured using the spectrophotometer SP60 over white and black backgrounds. Images of the same specimens were taken using a CCD camera attached to a stereoscopic loupe. The color of the image was measured (red-green-blue [RGB]) using an image processing software and converted to CIELAB coordinates. For each color coordinate, data from images were adjusted using linear regressions predicting those values from SP60. The whiteness index for dentistry (WI D ) and translucency parameter (TP 00 ) of the specimens as well as the color differences (ΔE 00 ) among pairwise shades were calculated. Data were analyzed via repeated-measures analysis of variance and Tukey's post hoc test (α = 0.05). Images obtained using the loupe tended to be darker and redder than the actual color. Data adjustment resulted in similar WI D , ΔE 00 , and TP 00 values to those observed for the spectrophotometer. Differences were observed only for the WI D of shade DA3 and ΔE 00 for comparing DA1 and DA3 over the black background. However, these differences were not clinically relevant. The use of adjusted data from images taken using a stereoscopic loupe is considered a feasible method for color measurement.

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Is it possible to determine the optical properties of resin composites with clinical spectrophotometers?

Cited by 5 publications

References 23 publications

Influence of repositioning guides’ color and usage on precision in tooth color measurement with a clinical spectrophotometer

Influence of repositioning guides’ color and usage on precision in tooth color measurement with a clinical spectrophotometer

The role of interface distance and underlying substrate on the color adjustment potential of single‐shade composites

Reliability of the color measurement of resin composites using images obtained using a stereoscopic loupe

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