Scaffolds implantables para regeneración ósea de defectos maxilares. Reporte de caso / No disponible

Los scaffolds son matrices de soportes orientados a estimular el crecimiento celular ex vivo o in vivo de nuevo tejido, cuando son utilizados in vivo, el biomaterial pasa a ser el transportador celular, debiendo estar cargado con componentes celulares y factores de crecimiento antes de ser implantado. Esta actuación terapéutica, se asienta sobre los principios biológicos de la regeneración ósea, en las que están implicadas células, matriz extracelular y señales osteoinductivas. El objetivo de este estudio propone una técnica quirúrgica de obturación ósea mínimamente invasiva basada en scaffolds implantables de hidroxiapatita y plasma rico en plaquetas(HAP/PRP) en un paciente con un defecto óseo de larga data. Los resultados obtenidos reflejan el aumento radiográfico del 75% del defecto representado por el trabeculado óseo en un periodo de un año (AU)

The scaffolds are arrays of media aimed at stimulating cell growth exvivo or in vivo of new tissue, when used in vivo, the biomaterial becomes cellular carrier, and must be loaded with cellular components and growth factors before being implanted. This therapeutic action, is based on biological principles of bone regeneration, in which cells are involved, extracellular matrix and osteoinductive signals. The aim of this study proposes a surgical technique for filling bone scaffolds based on minimally invasive implantable hydroxyapatite and platelet-rich plasma (PAH / PRP) in a patient with a bone defect of long standing. The results show an increase of 75% radiographic defect represented by the trabecular bone in a period of one year (AU)

Effectiveness and safety of tisuacryl in treating dentin hypersensitivity (DH).

INTRODUCTION: Dentin hypersensitivity (DH) is a painful tooth condition affecting a large proportion of the world population. While DH is not a direct cause of tooth loss, it does cause discomfort and stress. DH treatment methods include desensitizers, such as fluoride compounds; polycyanoacrylate coating; low intensity laser therapy; and surgery as a last resort. In Cuba, a fluoride varnish, Profilac, is widely used with acceptable results. Tisuacryl, an N-butyl-2-cyanoacrylate-based tissue adhesive is licensed in Cuba as a medical device used for closing wounds and as a protective covering or dressing for oral tissues. Experimental use of Tisuacryl in DH treatment has begun recently with good results. OBJECTIVE: Evaluate the effectiveness and safety of Tisuacryl in treating dentin hypersensitivity. METHODS: An experimental, prospective, longitudinal, multicenter, non-controlled clinical investigation was conducted using the licensed medical device Tisuacryl. The study universe consisted of patients with DH symptoms who sought treatment at three dental clinics in Havana Province between May 2007 and February 2009. The sample consisted of 152 patients who met inclusion and diagnostic criteria for the study. DH was classified as severe, moderate, or mild. Remission of dentinal pain was the principal variable for evaluating effectiveness. Safety variables were mucosal irritation and burning sensation at the treatment site. Treatment was considered successful if DH was cured, defined as remission of pain and relief of discomfort (irritation or burning sensation) with no other adverse events by the final evaluation on day 6 after treatment initiation. RESULTS: Tisuacryl treatment was successful in 96.7% of patients (81.5% with severe DH and 100% with mild to moderate DH). Mucosal irritation was observed in only 1 patient at first evaluation on day 2 but disappeared by the second evaluation. No other adverse events were reported. CONCLUSIONS: Tisuacryl was shown to be an effective, safe treatment of dentin hypersensitivity, especially moderate and mild cases.

Análisis del patrón de grabado ácido de resinas compuestas para restauraciones dentales / No disponible

La adhesión de las resinas compuestas a la estructura dentaria ya las resinas, en los casos de restaurar o reparar una restauración respectivamente, requieren de un tratamiento previo, es decir del grabado ácido o de tratamiento mecánico, con el fin de acondicionarlas topográficamente y lograr una traba mecánica entre el sustrato y el adhesivo del material de restauración. En este trabajo de investigación in vitro se ha realizado con el objetivo de determinar el patrón de grabado y la utilización del acido ideal para restaurar resinas compuestas, para esto se seleccionaron 18premolares extraídos a los cuales se le realizaron cavidades convencionales clase V para resinas, seguidamente fueron distribuidosal azar en tres grupos de tratamiento restaurador 1. Con resinas condensables, 2. Con resinas híbridas y 3. Con resinas microhíbridas, seguidamente, fue subdividido cada grupo para realizar el grabado ácido de la restauración con ácido fosfórico al 37% o ácido fluorhídrico al 9%, en tiempos de 15”, 30” y 45”. Posteriormente, fueron preparados los especímenes para analizarlos al microscopio electrónico de barrido y establecer cualitativamente las diferencias del patrón del grabado ácido y relacionarlo con los factores mecánicos para la retención de las resinas. En este estudio, se observó en las fotografías al microscopio electrónico los especímenes respectivos, y al ser tratados con ácido fluorhídrico por 45” se logró una superficie irregular y la formación de poros debido a la disolución de las partículas de relleno, esta topografía permite la traba mecánica para el adhesivo de la resina. Clínicamente una superficie irregular y con porosidades es propicia, desde el punto de vista mecánico para reparar una restauración de resina compuesta (AU)

The adhesion of the resins to the teeth structure, in the cases of restore or to repair a restoration, requires of a previous treatment, that is to say of the acid engraving or of mechanical treatment, with the purpose of to condition them topographically and to achieve a mechanical obstacle between the basis and the adhesive of the restoration material. In this research in vitro has been carried out with the objective of determining the engraving pattern and the use of the ideal acid to restore compound resins, for this 18 premolar teeth was selected extracted subsequently which were carried out cavities conventional class V for resins, they were distributed at random in three groups of restoring treatment 1. condensable resins, 2. hybrid resins and3. resins microhybrid, Subsequently, each group was subdivided to carry out the acid engraving of the restoration with phosphoric acid to the 37% or fluorhydric acid to 9%, in times of 15”, 30” and45.” Later on, these specimens were prepared to analyze in the electronic microscope of sweeping and to establish the differences of the pattern of the acid engraving qualitatively and to relate it with the mechanical factors for the retention of the resins. For this study, it was observed in the pictures to the electronic microscope the respective specimens, and when being treated with fluorhydric acid by 45” a surface irregular y the formation of pore it was achieved due to the breakup of the filler particles, this topography allows the mechanical obstacle for the adhesive of the resin. Clinically an irregular surface and with porosities it is favorable, from the mechanical point of view to repair a restoration of composites resin (AU)

Estudio comparativo de la acidez del medio bucal en presencia de aditamentos metálicos y sus implicaciones en los fenómenos corrosivos / No disponible

En Odontología se utilizan tratamientos ortodonticos para solucionarproblemas de mal oclusión. Con este fin suelen utilizarse materialesmetálicos, entre los que figuran los brackets. Partiendo de laaseveración de que la acidez producto del metabolismo bacterianoen la cavidad bucal puede originar corrosión en estos materiales, elpropósito de este trabajo experimental consiste en analizar la acidezdel medio bucal en presencia de estos aditamentos metálicos. Paraello se procedió a tomar las muestras a 30 pacientes de los cuales15 eran portadores de ortodoncia y 15 sin ortodoncia para detectarla acidez producto del crecimiento bacteriano a través del test deSnyder. Los resultados obtenidos fueron analizados estadísticamente,determinado que en ambos grupos de pacientes se detectócrecimiento bacteriano y disminución en el pH del medio bucal.Con este comportamiento y conociendo que la acidez de los medioscontribuye en los procesos corrosivos se afirma que dicha acidezresultante del crecimiento bacteriano podría significar unos de losfactores que producen deterioro por corrosión de los materialesmetálicos usados en Odontología

In Dentistry ortodontics treatments are used to solve to problemsbad occlusion among others. With this aim material metalists usuallyare used, between whom they appear brackets. Starting off of theasseveration of which the acidity product of the bacterial metabolismin the buccal cavity can originate corrosion in these materials, theintention of this experimental work consists of analyzing the acidityof buccal means in the presence of these metallic additions. For it itwas come to take the samples to 30 patients of who 15 were carryingof ortodontics treatments and 15 without ortodontics treatments todetect the acidity product of the bacterial growth through the test ofSnyder. The obtained results were analyzed statistically, determinedthat in both groups of patients it detected bacterial growth anddiminution in pH of buccal means. With this behavior and knowingthat the acidity of means contributes in the corrosive processes wecould conclude that this resulting acidity of the bacterial growthcould mean of the factors that produce deterioration by corrosion ofthe used metallic materials in Dentistry