The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement

Luo, Wen; Naeeni, Mojgan; Platten, Suzanne M.; Wang, Jinfang; Sun, Jianing N.; Westland, Stephen; Joiner, Andrew

doi:10.1016/j.jdent.2017.09.012

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…The alternatives, such as a spectrophotometry or colourimetry, can be prohibitively expensive; for example, a VITA Easyshade V spectrophotometer costs approximately GBP 2000. In addition, the potential purchaser may be influenced by the literature reporting that spectrophotometers lack some accuracy, as the measurements from these instruments are influenced by tooth curvature and enamel translucency [40,65] and have poor inter-device reliability [13].…”

Section: Discussionmentioning

confidence: 99%

“…Smartphones have become integral to our life [9,40,125], with ownership standing at approximately 60 to 80% of the global population (https://www.statista.com/statistics/20 3734/global-smartphone-penetration-per-capita-since-2005/, accessed on 24 October 2023). They are relatively inexpensive and easy to use; facilitate dentist-to-patient communication, including colour manipulation; and are non-proximity, resulting in allayed infection control concerns [3,5,32,38].…”

Section: Why Is There An Increasing Use Of Non-proximity Digital Reco...mentioning

confidence: 99%

“…Non-proximity instruments are not without their shortcomings. Colour accuracy is dependent on several factors, such as camera calibrations, lens selection, illumination sources, colour temperatures, and ambient light [13,15,30,36,37,40,45,47,49,52,80,108,126]. Most investigators [5,[7][8][9]13,31,35,36,[42][43][44]57,65] preferred using a macro lens with focal lengths (distance between the camera lens and the image sensor) between 50 and 105 mm; shorter focal length lens resulted in wider viewing angles and lower magnification of the target area (File S1; Table S13).…”

Section: Factors That Influence the Accuracy Of Shades Taken Using Di...mentioning

confidence: 99%

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Digital Shade Matching in Dentistry: A Systematic Review

Rashid,

Farook,

Dudley

2023

Dentistry Journal

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The pursuit of aesthetic excellence in dentistry, shaped by societal trends and digital advancements, highlights the critical role of precise shade matching in restorative procedures. Although conventional methods are prevalent, challenges such as shade guide variability and subjective interpretation necessitate a re-evaluation in the face of emerging non-proximity digital instruments. This systematic review employs PRISMA protocols and keyword-based search strategies spanning the Scopus®, PubMed.gov, and Web of ScienceTM databases, with the last updated search carried out in October 2023. The study aimed to synthesise literature that identified digital non-proximity recording instruments and associated colour spaces in dentistry and compare the clinical outcomes of digital systems with spectrophotometers and conventional visual methods. Utilising predefined criteria and resolving disagreements between two reviewers through Cohen’s kappa calculator, the review assessed 85 articles, with 33 included in a PICO model for clinical comparisons. The results reveal that 42% of studies employed the CIELAB colour space. Despite the challenges in study quality, non-proximity digital instruments demonstrated more consistent clinical outcomes than visual methods, akin to spectrophotometers, emphasising their efficacy in controlled conditions. The review underscores the evolving landscape of dental shade matching, recognising technological advancements and advocating for methodological rigor in dental research.

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Section: Discussionmentioning

confidence: 99%

Section: Why Is There An Increasing Use Of Non-proximity Digital Reco...mentioning

confidence: 99%

Section: Factors That Influence the Accuracy Of Shades Taken Using Di...mentioning

confidence: 99%

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Digital Shade Matching in Dentistry: A Systematic Review

Rashid,

Farook,

Dudley

2023

Dentistry Journal

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“…Por un lado, los espectrorradiómetros (Spectracam®, CS-2000) brindan mediciones precisas y altamente repetibles debido a que no hay pérdida en la emisión de fotones. En estos, el color se mide desde la distancia, lo que disminuye el error relacionado con la curvatura de la superficie, la pérdida de borde y la translucidez (13,29,30). De esta manera, se obtiene la toma de color sin contacto con la muestra coincidiendo con la geometría de la evaluación visual (13,29).…”

Section: Instrumentosunclassified

Parámetros para la evaluación visual e instrumental del color dental en estudios in-vitro. Revisión de la literatura

Ruíz–Pineda,

Gaona–Amador,

Torres-Rodríguez

2022

Acta Odontol. Colomb.

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Objetivo: establecer los parámetros para la evaluación visual e instrumental del color dental en estudios in-vitro a partir de la literatura científica publicada entre 2015 y 2021. Métodos: se realizó la búsqueda en las bases de datos: PubMed, Web of Science, Science Direct, Scopus, Scielo y Lilacs; también en el motor de búsqueda Google Académico y las bibliotecas de las editoriales Wiley y Springer. Las palabras clave utilizadas fueron tooth, color, in-vitro, color perception, shade matching, thresholds, appearance, surrounding, “CIELAB” y “CIEDE2000”. Teniendo en cuenta los criterios de elegibilidad, se seleccionaron los estudios de acuerdo al título, resumen y texto completo. Resultados: la búsqueda arrojó un total de 37 publicaciones que se agruparon en tres tópicos: 1. toma de color visual: condiciones ambientales, observadores y nivelación; 2. toma de color instrumental: instrumentos; y 3. procesamiento de datos: cálculo de la diferencia de color y umbrales de perceptibilidad (PT) y aceptabilidad (AT). Conclusiones: los aspectos más importantes en la evaluación visual son la iluminación, el ambiente para registro (sitio, entorno y fondo alrededor de la muestra), las condiciones geométricas de visualización, los observadores y el uso de guías. En la evaluación instrumental es relevante elegir el aparato apropiado de acuerdo con su precisión y reproducibilidad, como los espectroradiómetros y los espectrofotómetros de uso clínico. Se presenta el procesamiento de datos para establecer las variaciones de cada coordenada, las diferencias de color (ΔE): CIELAB y CIEDE2000, los umbrales y los lineamientos.

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“…However, spectrophotometers are expensive, have varying degrees of inter-device reliability, and are not readily available within most dental clinics [ 1 , 3 , 17 – 19 ]. Regardless, values from these devices are widely accepted as standard reference and they measure color values within the CIELAB color space [ 14 , 17 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Color variations during digital imaging of facial prostheses subjected to unfiltered ambient light and image calibration techniques within dental clinics: An in vitro analysis

et al. 2022

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Background The study aimed to evaluate 1) the amount of color variations presents within clinical images of maxillofacial prosthetic silicone specimens when photographed under different clinically relevant ambient lighting conditions, and 2) whether white balance calibration (WBC) methods were able to mitigate variations in ambient lighting. Methods 432 measurements were acquired from standardized images of the pigmented prosthetic silicone specimens within different ambient lighting conditions (i.e., 2 windowed and 2 windowless clinics) at noon with no light modifying apparatus. The specimens were photographed once without any white balance calibration (raw), then independently alongside an 18% neutral gray card and Macbeth color chart for calibration in a post-processing (PPWBC) software, and once after camera calibration (CWBC) using a gray card. The LAB color values were extracted from the images and color variations (ΔE) were calculated after referring to the corresponding spectrophotometric values as control. Results Images in windowless and windowed clinics exhibited highly significant differences (p < 0.001) with spectrophotometer (control). CWBC demonstrated no significant differences (p > 0.05) in LAB values across windowed clinics. PPWBC using Macbeth color chart produced no significant differences for a* values (p > 0.05) across all clinics while PPWBC by gray card showed no significant differences (p > 0.05) in LAB values when only similar clinics (either windowed or windowless) were compared. Conclusion Significant color variations were present for maxillofacial prosthetic specimens owing to natural ambient light. CWBC and PPWBC using color charts were more suitable for color correction across windowed clinics while CWBC and PPWBC using gray cards had better outcomes across windowless setups.

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The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement

Abstract: Digital imaging based techniques gives a highly reproducible approach to measuring tooth colour.

Cited by 6 publications

References 28 publications

Digital Shade Matching in Dentistry: A Systematic Review

Digital Shade Matching in Dentistry: A Systematic Review

Parámetros para la evaluación visual e instrumental del color dental en estudios in-vitro. Revisión de la literatura

Color variations during digital imaging of facial prostheses subjected to unfiltered ambient light and image calibration techniques within dental clinics: An in vitro analysis

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