Juan de la Cruz Cardona

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Advances in the development of cornea substitutes by tissue engineering techniques have focused on the use of decellularized tissue scaffolds. In this work, we evaluated different chemical and physical decellularization methods on small intestine tissues to determine the most appropriate decellularization protocols for corneal applications. Our results(More)
OBJECTIVES Evaluate color and translucency of both non-colored and colored zirconia ceramics and compare them with corresponding properties of human dentine. METHODS 0.5mm thick samples of human (MSHD) and bovine (MSBD) dentine were obtained from 5 extracted human anterior maxillary teeth and 5 bovine incisors, respectively. The zirconia systems evaluated(More)
The prevalence of myopia and refractive errors is known to vary among different societies, and these differences may be attributed partly to differences in genetic background and partly to environmental factors, especially the amount of near work performed. The goal of this study was to determine the prevalence of refractive errors in school-age children in(More)
PURPOSE To examine the transparency characteristics at different times of development in the culture of 2 different types of human corneal stroma substitutes generated by tissue engineering using human fibrin or human fibrin and 0.1% agarose, with human keratocytes entrapped within. METHODS The transparency of these artificial corneal stromas was analyzed(More)
OBJECTIVES To use the Kubelka-Munk theory to evaluate the scattering (S), absorption (K) and transmittance (T) of non-colored and colored dental zirconia systems and human (HD) and bovine (BD) dentins. METHODS Two zirconia systems were used: ZC- ZirCAD (Ivoclar Vivadent) and LV-LAVA (3M ESPE). Specimens from each ceramic system were divided into 3 groups(More)
Tooth bleaching is becoming increasingly popular among patients and dentists since it is a relatively noninvasive approach for whitening and lightening teeth. Instruments and visual assessment with respect to commercial shade guides are currently used to evaluate tooth color. However, the association between these procedures is imprecise and the degree of(More)
BACKGROUND Being able to estimate (predict) the final spectrum of reflectance of a biomaterial, especially when the final color and appearance are fundamental for their clinical success (as is the case of dental resin composites), could be a very useful tool for the industrial development of these type of materials. The main objective of this study was the(More)
OBJECTIVES To evaluate colour differences between (1) CAD-CAM ceramic systems considering shades A1, A2 and A3 and the corresponding nominal shade of VC (Vita Classical shade guide) and (2) shades A1-A2, A2-A3 and A1, A2 and A3 within the same ceramic system. METHODS Samples of shades A1, A2 and A3 were fabricated (n=5) from CAD-CAM ceramic blocks (IPS(More)
The present work carries out a novel study on the determination of color acceptability thresholds using a Takagi-Sugeno-Kang (TSK) fuzzy approximation, performing an evaluation of the CIEDE2000(K<inf>L</inf>:K<inf>C</inf>:K<inf>H</inf>) color difference formula in dentistry. A total of 55 sample pairs were evaluated by a panel of 28 observers. The responses(More)