In vitro characterization of a novel resin-based restorative material containing alkaline fillers

Abstract 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), an alkasite-based resinous material (Cention N), and a resin composite (Tetric N Ceram)—were characterized 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 significance 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.

Medicina cannabinoide en el territorio orofacial: estado actual y perspectivas a futuro / Cannabinoid medicine in the orofacial region: status and prospects

Introducción: El interés por emplear cannabis y cannabinoides como herramienta terapéutica ha tomado relevancia en la medicina en los últimos años. En sintonía con ello en odontología se ha incrementado el interés por su estudio. El objetivo de la presente revisión narrativa fue analizar y sintetizar la información disponible acerca de las posibilidades terapéuticas actuales del cannabis en odontología y sus perspectivas futuras. Materiales y métodos: Se realizó una búsqueda electrónica que abarcó artículos hasta diciembre del 2022, en las bases de datos MEDLINE, Scopus, Scielo y Google Académico. Se utilizaron las siguientes palabras claves principales: "dental", "dentistry", "cannabis", "cannabinoids", "benefits", "therapeutics", "treatment", "potential". En las búsquedas iniciales se encontraron un total de 834 registros. Se evaluó la elegibilidad de 45 artículos de texto completo. Se incluyeron 35 estudios para el análisis cualitativo de la presente revisión. Resultados: Los estudios muestran gran variedad de cannabinoides y derivados empleados, preparados comerciales, así como preparados experimentales. Se han llevado adelante estudios in vitro, in vivo y clínicos que evalúan la acción de los cannabinoides en el control del dolor orofacial, de la inflamación, como cicatrizante, en la regeneración del tejido óseo, como antimicrobiano y su capacidad anticancerígena. Conclusiones: Los cannabinoides han demostrado potencial en el tratamiento de diversas condiciones y/o alteraciones bucales. Aún la estandarización de los productos y protocolos de tratamiento es insuficiente por los que son necesarios más estudios que evalúen presentaciones, derivados, métodos de extracción, concentraciones y vías de administración.

Introduction: The interest in using cannabis and cannabinoids as a therapeutic tool has gained relevance in medicine in recent years. In line with this, interest in its study has increased in dentistry. The aim of the present narrative review was to analyze and synthesize the available information about the current therapeutic possibilities of cannabis in dentistry and its future perspectives. Materials and methods: an electronic search conducted that included articles until December 2022, in the MEDLINE, Scopus, Scielo and Google Scholar databases. The following main keywords used: "dental," "dentistry," "cannabis," "cannabinoids," "benefits," "therapeutics," "treatment," "potential." A total of 834 records founded in the first searches. Forty-five full-text articles assessed for eligibility. Thirty-five studies included for the qualitative analysis of the present review. Results: Studies show a great variability of cannabinoids and derivatives used, including commercial preparations, as well as experimental preparations. In vitro, in vivo, and clinical studies had conducted evaluating the action of cannabinoids in the control of orofacial pain, as anti-inflammatory and healing, in bone tissue regeneration, as antimicrobial and evaluating their anti-cancer ability. Conclusions: Cannabinoids have shown potential in the treatment of various oral conditions and/or disorders. Even the standardization of products and treatment protocols is insufficient, which is why more studies are necessary to evaluate presentations, derivatives, extraction methods, concentrations, and routes of administration for their best use.

Decálogo de buenas prácticas para el uso y mantenimiento de las Unidades de Fotocurado LEDs

Actualmente varios biomateriales restauradores resinosos endurecen mediante una reacción de fotopolimerización, para lo cual es necesaria una unidad de polimerización (UP). El objetivo de este manuscrito es generar una guía basada en la evidencia científica actual para contribuir al correcto uso de las UP. Se realizó una búsqueda de artículos publicados desde el año 2002 hasta enero del 2022 a través de PubMed y Google Scholar. Se organizó la información en 10 tópicos de relevancia en forma de decálogo: longitud de onda, intensidad de la luz, diámetro de la punta, tiempo de curado, modo de curado, distancia de curado, uso de barreras, batería y carga, limpieza y desinfección, finalizando con los controles periódicos. Los profesionales de la salud deben conocer y recordar la importancia de realizar un adecuado uso y mantenimiento de las UP, ya que esto puede influir en el desempeño clínico de los biomateriales.

Atualmente, diversos biomateriais restauradores resinosos endurecem através de uma reação de fotopolimerização, para a qual é necessária uma unidade de polimerização (UP). O objetivo deste manuscrito é gerar um guia baseado em evidências científicas atuais para o uso correto de UPs. Foi feita uma busca por artigos publicados de 2002 a janeiro de 2022 por meio do PubMed e Google Scholar. As informações foram organizadas em 10 tópicos relevantes na forma de um decálogo: comprimento de onda, intensidade da luz, diâmetro da ponta, tempo de cura, modo de cura, distância de cura, uso de barreiras, bateria e carregamento, limpeza e desinfecção e verificações regulares. Os profissionais de saúde devem conhecer e lembrar a importância do uso e manutenção adequados das UPs, pois isso pode influenciar no desempenho clínico do biomaterial.

Propiedades flexurales y estabilidad de color de materiales restauradores estéticos indirectos / Flexural properties and color stability of indirect esthetic restorative materials

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(AU)

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 stability 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(AU)

Evaluation of irradiance and radiant exposure on the polymerization and mechanical properties of a resin composite

Abstract The objective of the present study was to evaluate the effect of irradiance and radiant exposure on the chemical-mechanical properties of a resin composite. A micro-hybrid resin composite (Clearfil AP-X, Kuraray) was investigated under two different irradiances: low (300 mW/cm2) and high (800 mW/cm2) and radiant exposures: 8 and 16 J/cm2. Four groups, named Low 8 J/cm2, High 8 J/cm2, Low 16 J/cm2, and High 16 J/cm2 were tested, and their flexural strengths, elastic moduli, depths of cure, and degrees of conversion were evaluated. Data were analyzed using two-way ANOVA and Tukey's test. A multiple linear regression model was used to correlate the irradiance and radiant exposure with dependent variables (α = 0.05). Irradiance and radiant exposure were found statistically significant for all dependent variables. The interaction between the factors was statistically significant only for the degree of conversion and elastic modulus. Group Low 16 J/cm2 exhibited a significantly superior performance in all the evaluated properties. Barring the degree of conversion, no significant differences were observed among the properties evaluated between the Low 8 J/cm2 and High 8 J/cm2 groups. The adjusted R2 values were high for the depth of cure and degree of conversion (0.58 and 0.96, respectively). Both irradiance and radiant exposure parameters play an important role in establishing the final properties of a micro-hybrid resin composite. Irradiance has a greater influence under higher radiant exposures.

Evaluación de la resistencia de unión a dentina humana de un sistema adhesivo universal con clorhexidina utilizado en modo de grabado total y autocondicionante / Avaliação da resistência de união à dentina humana de um sistema adesivo universal com clorexidina utilizado no modo de condicionamento total e autocondicionante Romina Tessore1 / Human dentin bond strength of a chlorhexidine containing universal adhesive system used in total-etch and self-etch mode

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 microtracción 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 selfetch 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.

Influencia del consumo de cannabis en la enfermedad periodontal: una Scoping Review / Influence of cannabis use on periodontal disease: a scoping review

Recientes publicaciones plantean la posible asociación del cannabis (Cannabis sativa) con el desarrollo de la periodontitis. Objetivo: Analizar la influencia del consumo de cannabis en la enfermedad periodontal, relevando la evidencia disponible e identificando las variables asociadas en los estudios . Material y método: se realizó una Scoping Review a partir de una búsqueda estructurada en PubMed/ MEDLINE, Science Direct, LILACS, SciELO hasta mayo de 2017 .Resultados: Estudios "In vivo" mostraron una mayor pérdida ósea en animales expuestos a Cannabis. Los casos clínicos muestran que el uso crónico de cannabis puede resultar en agrandamientos gingivales y periodontitis crónica severa localizada. Los estudios epidemiológicos demuestran una asociación estadística entre Cannabis y periodontitis. Conclusiones:El consumo del Cannabis parece estar asociado con una mayor presencia de periodontitis. Sin embargo, se desconoce el mecanismo específico por el cual actúa en los tejidos gingivales.

Recent publications suggest the possible association between cannabis (Cannabis sativa) and periodontitis. Objective: To analyze the possible influence of cannabis use on periodontal disease, highlighting the available evidence and identifying the associated variables in the studies. Materials and methods: We conducted a scoping review applying a structured search method in PubMed/MEDLINE, Science Direct, LILACS, SciELO including publications until May 2017. Results: In vivo studies showed greater bone loss in animals exposed to cannabis. Clinical cases show that chronic cannabis use may result in gingival enlargement (with clinical features similar to phenytoin induced enlargement) and localized severe chronic periodontitis. Most of the epidemiological studies confirmed the possible association between cannabis and periodontitis. Conclusions: The consumption of cannabis seems to be associated with a greater presence of periodontitis. However, the specific mechanism by which cannabis acts in the gingival tissues is unknown.