Juan de la Cruz Cardona

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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)
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)
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)
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)
OBJECTIVES To evaluate relevant optical properties of esthetic direct restorative materials focusing on whitened and translucent shades. METHODS Enamel (E), body (B), dentin (D), translucent (T) and whitened (Wh) shades for E (WhE) and B (WhB) from a restorative system (Filtek Supreme XTE, 3M ESPE) were evaluated. Samples (1 mm thick) were prepared.(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)
PURPOSE Tissues and biomaterials used for corneal surface repair require fulfilling specific optical standards prior to implantation in the patient. However, there is not a feasible evaluation method to be applied in clinical or Good Manufacturing Practice settings. In this study, we describe and assess an innovative easy-applied photographic-based method(More)
Ideally, biomaterials designed to play specific physical and physiological roles in vivo should comprise components and microarchitectures analogous to those of the native tissues they intend to replace. For that, implantable biomaterials need to be carefully designed to have the correct structural and compositional properties, which consequently impart(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)