FIABILIDAD DE UN NUEVO SISTEMA PARA LA DETERMINACIÓN Y ANÁLISIS DEL COLOR DENTAL UTILIZANDO IMAGENOLOGÍA DIGITAL

FIABILIDAD DE UN NUEVO SISTEMA PARA LA DETERMINACIÓN Y ANÁLISIS DEL COLOR DENTAL UTILIZANDO IMAGENOLOGÍA DIGITAL Rony Christian Hidalgo-Lostaunau , Sandra Tatiana Córdova-Aliaga, Iván Dante Huamantumba-Espinoza DOI: https://doi.org/10.33017/RevECIPeru2009.0008/ RESUMEN El color dental es apareado con guías de color para determinar una referencia que permita su descripción y comunicación en procedimientos clínicos donde se empleen materiales dentocoloreados. Objetivo: establecer la fiabilidad de un nuevo sistema de registro y análisis del color dental empleando imágenes digitalizadas, un cubículo fotográfico con iluminación ad hoc y un software de edición fotográfica, con la guía de color Vitapan 3D Master. Métodos: fueron fotografiadas con una cámara digital a 5x las 5 primeras cuentas de cada nivel de claridad de la guía Vitapan 3D-M 6 veces sucesivas cada una, sin retirar la cuenta y retirando la cuenta entre toma y toma, empleando un cubículo fotográfico iluminado con fluorescente daylight (2350lm, IRC >95, 5400°K); registradas en formato TIFF, adaptadas en Adobe Photoshop 7.0, para ser analizadas por el histograma del color del sistema CIELab que admite este software resultados: los márgenes de error al realizar tomas continuas es de 1.52 a 3.76, y discontinuas es de 1.50 a 3.78. No se hallaron diferencias significativas al comparar ambos métodos en los 5 niveles de L* (Wilcoxo p≥0.138), Blancura (Wilcoxo p≥0.116), tampoco ∆E superiores a 0.84 Conclusión: la semejanza en el margen de error otorga fiabilidad al método; la validez del sistema por su concordancia en el análisis CIELab de las imágenes digitales de las cuentas de color, permiten sugerirlo sistema como un de alta reproducibilidad para la cuantificación objetiva del color dental in vitro, a ser empleado en la docencia e investigación del color dental y sus implicancias. Palabras clave: análisis del color, estudio de validación, fiabilidad, CIELab, fotografía digital, imagen digital. ABSTRACT The dental color is matched up with color guides to determine a reference that allows its description and communication in clinical procedures where tooth-colored materials are used. OBJECTIVE: To establish the reliability of a new system for registration and analysis of the dental color using digitized images, a photographic cubicle with illumination ad hoc and a software of photographic edition, with the color guide Vitapan 3D Master. METHODS: The first 5 bills of each level of clarity of the guide Vitapan 3D-M were photographed with a digital camera at 5x, in 6 successive times each a, without moving away the bead and moving away the bead among picture and picture, using an illuminated photographic cubicle with fluorescent daylight (2350lm, IRC >95, 5400°K); registered in format TIFF, adapted in Adobe Photoshop 7.0, to be analyzed by the histogram of the color of the system CIELab that admits this software. RESULTS: The error margins to the Continuum takeovers is of 1.52 to 3.76 3.76, and discontinuous it becomes of 1.50 to 3.78. Does it not find significant differences to the comparing both methods in L* levels (Wilcoxo p≥0.138), Whitenig (Wilcoxo p≥0.116), neither ∆E superior to 0.84. CONCLUSION: The similarity in the error margin grants reliability to the method; The validity of the system for his concordance in the analysis CIELab of the digital images of the color beads, allows to suggest it as a reliable instrument of high reproducibility in order to the dental color's objective quantification in vitro, to be employee in the teaching and investigation of the dental color and his sequels. Keywords: shade analysis, Validation Studies, Reliability, CIELab, digital photograph, digital imaging.

Reliability of conventional shade guides in teeth color determination

Background/Aim. Color matching in prosthodontic therapy is a very important task because it influences the esthetic value of dental restorations. Visual shade matching represents the most frequently applied method in clinical practice. Instrumental measurements provide objective and quantified data in color assessment of natural teeth and restorations. In instrumental shade analysis, the goal is to achieve the smallest ?E value possible, indicating the most accurate shade match. The aim of this study was to evaluate the reliability of commercially available ceramic shade guides. Methods. VITA Easyshade spectrophotometer (VITA, Germany) was used for instrumental color determination. Utilizing this device, color samples of ten VITA Classical and ten VITA 3D - Master shade guides were analyzed. Each color sample from all shade guides was measured three times and the basic parameters of color quality were examined: ?L, ?C, ?H, ?E, ?Elc. Based on these parameters spectrophotometer marks the shade matching as good, fair or adjust. Results. After performing 1,248 measurements of ceramic color samples, frequency of evaluations adjust, fair and good were statistically significantly different between VITA Classical and VITA 3D Master shade guides (p = 0.002). There were 27.1% cases scored as adjust, 66.3% as fair and 6.7% as good. In VITA 3D - Master shade guides 30.9% cases were evaluated as adjust, 66.4% as fair and 2.7% cases as good. Conclusion. Color samples from different shade guides, produced by the same manufacturer, show variability in basic color parameters, which once again proves the lack of precision and nonuniformity of the conventional method.