Colibri Colección :https://hdl.handle.net/20.500.12008/342024-03-29T13:37:00Z2024-03-29T13:37:00ZEvaluación de la resistencia de unión a dentina humana de un sistema adhesivo universal con clorhexidina utilizado en modo de grabado total y autocondicionanteTessore, RominaSilveira, CamilaVázquez, PriscilaMederos, MatíasGarcía, AndrésCuevas-Suarez, Carlos EnriqueGrazioli, Guillermohttps://hdl.handle.net/20.500.12008/431422024-03-18T15:42:51Z2020-01-01T00:00:00ZTítulo: Evaluación de la resistencia de unión a dentina humana de un sistema adhesivo universal con clorhexidina utilizado en modo de grabado total y autocondicionante
Autor: Tessore, Romina; Silveira, Camila; Vázquez, Priscila; Mederos, Matías; García, Andrés; Cuevas-Suarez, Carlos Enrique; Grazioli, Guillermo
Resumen: Objetivos: Evaluar la resistencia de unión a la microtracción en dentina humana de un sistema adhesivo universal con clorhexidina en su composición, en modo de grabado y lavado en 2 pasos, y en modo de autograbado. Metodología: 20 terceros molares divididos aleatoriamente en 4 grupos según el tipo de sistema adhesivo utilizado (Single Bond Universal®, 3MESPE y Peak Universal Bond®, Ultradent Products) y modo de uso (grabado total y autograbado). Se confeccionaron cuerpos de prueba sometidos al ensayo de icrotracción utilizando una máquina de ensayos universales.Resultados: No se encontraron diferencias estadísticamente significativas entre los cuatro grupos estudiados. Conclusiones: La resistencia de unión de una resina compuesta a dentina humana no fue afectada por el uso de un sistema adhesivo universal que contiene clorhexidina en su composición aplicado en los modos de grabado total y autograbado.; Objectives: To evaluate the microtensile bond strength to human dentin of chlorhexidine containing universal adhesive system applied in the total-etch and self etch modes.Methods: Twenty third molars were randomly divided into four groups according to the universal adhesive system (Single Bond Universal ®, 3M ESPE and Peak Universal Bond®, Ultradent) and application mode used (total-etch and self-etch). Specimens were prepared and subjected to a microtensile bond strength using a MTS SANS universal testing machine. Results: No statistically significant differences were found in the microtensile bond strength between the four groups studied. Conclusions: The bond strength of a composite resin to human dentin was not affected by the use of a universal adhesive system with chlorhexidine in its composition applied in the total-etch and
self-etch modes.; Objetivos: Avaliar a resistência de união á microtração na dentina humana de um sistema adesivo universal com clorexidina na sua composição, no modo de condicionamento total em dois passos e no modo autocondicionante. Metodologia: 20 terceiros molares foram divididos aleatoriamente em 4 grupos, de acordo com o tipo de sistema adesivo utilizado (Single Bond Universal®, 3MESPE e Peak Universal Bond®, Ultradent Products) e modo de uso (condicionamento total e autocondicionante). Os corpos de prova
criados foram submetidos ao teste de microtração utilizando uma máquina de ensaios universal. Resultados:
Não foram encontradas diferenças estatisticamente significativas entre os quatro grupos estudados. Conclusões: A resistência de união da resina composta à dentina humana não foi afetada pelo uso de um sistema adesivo universal contendo clorexidina em sua composição, aplicado nos modos de condicionamento total ou autocondicionamento.2020-01-01T00:00:00ZPropiedades flexurales y estabilidad de color de materiales restauradores estéticos indirectosMederos, Matíasde León Cáceres, ElisaTessore, RominaGarcía, AndrésCuevas-Suárez, Carlos EnriqueGrazioli, Guillermohttps://hdl.handle.net/20.500.12008/431162024-03-15T17:09:11Z2022-01-01T00:00:00ZTítulo: Propiedades flexurales y estabilidad de color de materiales restauradores estéticos indirectos
Autor: Mederos, Matías; de León Cáceres, Elisa; Tessore, Romina; García, Andrés; Cuevas-Suárez, Carlos Enrique; Grazioli, Guillermo
Resumen: Introducción: Las diferencias en las propiedades mecánicas de los materiales cerámicos y a base de resina plantean la interrogante sobre cuál puede tener un mejor desempeño a largo plazo. Objetivos: Evaluar la resistencia flexural y estabilidad de color de diferentes materiales restauradores estéticos indirectos. Métodos: Los materiales seleccionados fueron Filtek™ Z250 XT (3M ESPE), Ceramage (SHOFU Dental), VITA VM® LC y VITA ENAMIC® (VITA Zahnfabrik), IPS e.max® (Ivoclar-Vivadent) y Zolid FX (Amann Girrbach AG). El ensayo de resistencia flexural (n = 10) fue realizado en una máquina universal de ensayos mecánicos. Las lecturas de color (n = 5) se midieron en un espectrofotómetro VITA Easyshade V®. Resultados: Los materiales totalmente cerámicos mostraron un mejor desempeño mecánico (p < 0,001). Los resultados de estabilidad de color muestran que Ceramage, IPS e.max® y Zolid FX, mostraron una diferencia estadísticamente significativa (p ≤ 0,002) con Filtek Z250 XT, VITA VM® LC y VITA ENAMIC®. Conclusiones: Los materiales totalmente cerámicos presentaron una mayor resistencia flexural y estabilidad de color que los materiales de base polimérica. A pesar de ello, los materiales estéticos indirectos con polímeros en su composición, como Ceramage, se presentan como una alternativa válida, ya que además de tener propiedades mecánicas adecuadas, poseen una estabilidad de color semejante a los materiales cerámicos.; Introduction: Differences in the mechanical properties of ceramic and resin-based materials pose the question of which of the two will perform better in the long run. Objectives: Evaluate the flexural resistance and color sta-
bility of different indirect esthetic restorative materials. Methods: The materials selected were Filtek™ Z250 XT (3M ESPE), Ceramage (SHOFU Dental), VITA VM® LC and VITA ENAMIC® (VITA Zahnfabrik), IPS e.max® (Ivoclar-Vivadent) and Zolid FX (Amann Girrbach AG). The flexural resistance assay (n = 10) was conducted in a universal mechanical testing machine. Color readings (n = 5) were taken with a VITA Easyshade V® spectrophotometer. Results: All-ceramic materials had better mechanical performance (p < 0.001). Color stability results show that Ceramage, IPS e.max® and Zolid FX displayed a statistically significant difference (p ≤ 0.002) with respect to Filtek Z250 XT, VITA VM® LC and VITA ENAMIC®. Conclusions: All-ceramic materials exhibited greater flexural resistance and color stability than polymer-based materials. However, indirect esthetic materials with polymers in their composition, such as Ceramage, are presented as a valid alternative, due to their appropriate mechanical properties and their color stability, which is similar to that of ceramic materials.2022-01-01T00:00:00ZA multi-country survey on the impact of COVID-19 on dental practice and dentists’ feelings in Latin AmericaMoraes, Rafael R.Cuevas Suárez, Carlos EnriqueEscalante‑Otárola, Wilfredo G.Fernández, María R.Dávila‑Sánchez, AndrésGrau‑Grullon, PatriciaFernández, EduardoLópez, Tania M.Grazioli, GuillermoArana, Luis A.Rondón, Luis F.Torrez, Willy B.Lima, Giana S.Schuch, Helena S.Correa, Marcos B.Demarco, Flavio F.https://hdl.handle.net/20.500.12008/431102024-03-19T21:24:42Z2022-01-01T00:00:00ZTítulo: A multi-country survey on the impact of COVID-19 on dental practice and dentists’ feelings in Latin America
Autor: Moraes, Rafael R.; Cuevas Suárez, Carlos Enrique; Escalante‑Otárola, Wilfredo G.; Fernández, María R.; Dávila‑Sánchez, Andrés; Grau‑Grullon, Patricia; Fernández, Eduardo; López, Tania M.; Grazioli, Guillermo; Arana, Luis A.; Rondón, Luis F.; Torrez, Willy B.; Lima, Giana S.; Schuch, Helena S.; Correa, Marcos B.; Demarco, Flavio F.
Resumen: Background: The COVID‑19 pandemic has significantly influenced the routine of healthcare workers. This study
investigated the impact of the pandemic on dental practice and dentists’ feelings in Latin America. Methods: A survey was conducted with dentists from 11 Spanish‑speaking Latin American countries in September–December 2020. Professionals were invited by email and via an open campaign promoted on social media. The questions investigated dental care routines, practice changes, and feelings about the pandemic. Descriptive statistics were used to identify frequencies and distributions of variables. Proportions were compared using chi‑square tests. Results: A total of 2127 responses were collected from a sample with diverse demographic, sex, work, and education characteristics. The impact of COVID‑19 was considered high/very high by 60% of respondents. The volume of patients assisted weekly was lower compared with the pre‑pandemic period (mean reduction = 14 ± 15 patients). A high rate of fear to contracting the COVID‑19 at work was observed (85%); 4.9% of participants had a positive COVID‑19 test. The main professional challenges faced by respondents were reduction in the number of patients or financial gain (35%), fear of contracting COVID‑19 (34%), and burden with or difficulty in purchasing new personal protective equipment (22%). The fear to contracting COVID‑19 was influenced by the number of weekly appointments. A positive test by the dentists was associated with their reports of having assisted COVID‑19 patients. The most cited feelings about the pandemic were uncertainty, fear, worry, anxiety, and stress. Negative feelings were more prevalent for professionals who did not receive training for COVID‑19 preventive measures and those reporting higher levels of fear to contract the disease. Conclusion: This multi‑country survey indicated a high impact of the pandemic on dental care routines in Latin America. A massive prevalence of bad feelings was associated with the pandemic.2022-01-01T00:00:00ZIn vitro characterization of a novel resin-based restorative material containing alkaline fillersMederos, Matíasde León Cáceres, ElisaGarcía, AndrésCuevas-Suarez, Carlos EnriqueHernández-Cabanillas, Juan CarlosRivera-Gonzaga, José AlejandroGrazioli, Guillermohttps://hdl.handle.net/20.500.12008/430432024-03-13T12:42:43Z2024-01-01T00:00:00ZTítulo: In vitro characterization of a novel resin-based restorative material containing alkaline fillers
Autor: Mederos, Matías; de León Cáceres, Elisa; García, Andrés; Cuevas-Suarez, Carlos Enrique; Hernández-Cabanillas, Juan Carlos; Rivera-Gonzaga, José Alejandro; Grazioli, Guillermo
Resumen: Objective: In this study, a comparative evaluation of the physicochemical properties of Cention N and other direct restorative materials was performed. Three restorative materials—a resin-modified glass ionomer (Fuji II LC), analkasite-based resinous material (Cention N), and a resin composite (Tetric N Ceram)—were haracterized in terms of degree of conversion, Knoop hardness number (KHN) ratio, flexural strength, elastic modulus, water sorption, water solubility, microshear bond strength to dentin, immediate microleakage, and radiopacity. Methodology: The microshear bond strength to dentin and microleakage of Cention N were evaluated with and without the application of an adhesive system (Tetric N Bond Universal). A one-way
ANOVA test was used to analyze the data in terms of degree of conversion, KHN ratio, water sorption, water solubility, microshear bond strength to dentin, and radiopacity. A two-way ANOVA test (carried out considering the material type and ethanol aging as factors) was used to analyze the data in terms of flexural strength and elastic modulus. The Kruskal–Wallis test was used to statistically analyze the data on microleakage. A ignificance level of α=0.05 was used for all tests. Results: Fuji II LC was found to have the highest degree of conversion, water sorption, and microleakage, as well as the lowest flexural strength. Cention N had the highest solubility; when used with an adhesive system, it achieved bond strength and microleakage similar to those of the Tetric N Ceram composite. Tetric N Ceram had the highest degree of conversion, KHN ratio, and radiopacity. Conclusion: The properties of Cention N validate its efficacy as an alternative direct restorative material when used in conjunction with an adhesive system.2024-01-01T00:00:00Z