Resultado de las sobredentaduras superiores según número de implantes dentales en pacientes edéntulos totales

Objetivo: Realizar una revisión de la literatura sobre el resultado de las sobredentaduras maxilares según el número de implantes dentales en pacientes edéntulos totales. Materiales y Métodos: Se realizó una búsqueda bibliográfica sistematizada en los motores de búsqueda Pubmed, Scopus y Web of Science y luego de establecer los criterios y filtros de la misma, se utilizaron 6 artículos. De los 6 artículos analizados, 4 fueron estudios de tipo ensayo clínico aleatorizado, 1 estudio prospectivo y 1 estudio retrospectivo. Resultados: Los resultados clínicos de las sobredentaduras maxilares, basados en el número de implantes sobre los cuales fueron soportadas, y comparando los protocolos más difundidos e investigados como los de All-on-4 y All-on-6, fueron similares. Se consideran óptimos, confiables, exitosos y longevos, sin diferencia significativa según el número de implantes dentales colocados. Conclusiones: Las sobredentaduras maxilares soportadas por 4 o 6 implantes fueron técnicas de tratamiento confiables, y ofrecen resultados comparables. Las complicaciones fueron limitadas y los resultados óptimos y duraderos.

Objective: To review the literature on the outcome of maxillary overdentures according to the number of dental implants in edentulous patients. Materials and Methods: A systematic bibliographic search was carried out in the Pubmed, Scopus and Web of Science search engines and, after appliying the criteria and filters, 6 articles were used. Of the 6 articles analyzed, 4 were randomized clinical trial type studies, 1 prospective study and 1 retrospective study. Results: The results of maxillary overdentures, according to the number of implants used to support them, and comparing the most widespread and researched protocols such as All-on-4 and All-on-6, were similar. They are considered optimal, reliable, successful and long-lived, with no significant difference within the number of dental implants placed. Conclusions: Maxillary overdentures supported by 4 or 6 implants were reliable, and exhibit comparable results. The complications were limited, and the results were optimal and enduring.

Resultado de las sobredentaduras superiores según número de implantes dentales en pacientes edéntulos totales / Outcome of maxillary overdentures according to the number of dental implants in full edentulous patients

RESUMEN Objetivo: Realizar una revisión de la literatura sobre el resultado de las sobredentaduras maxilares según el número de implantes dentales en pacientes edéntulos totales. Materiales y Métodos: Se realizó una búsqueda bibliográfica sistematizada en los motores de búsqueda Pubmed, Scopus y Web of Science y luego de establecer los criterios y filtros de la misma, se utilizaron 6 artículos. De los 6 artículos analizados, 4 fueron estudios de tipo ensayo clínico aleatorizado, 1 estudio prospectivo y 1 estudio retrospectivo. Resultados: Los resultados clínicos de las sobredentaduras maxilares, basados en el número de implantes sobre los cuales fueron soportadas, y comparando los protocolos más difundidos e investigados como los de All-on-4 y All-on-6, fueron similares. Se consideran óptimos, confiables, exitosos y longevos, sin diferencia significativa según el número de implantes dentales colocados. Conclusiones: Las sobredentaduras maxilares soportadas por 4 o 6 implantes fueron técnicas de tratamiento confiables, y ofrecen resultados comparables. Las complicaciones fueron limitadas y los resultados óptimos y duraderos.

ABSTRACT Objective: To review the literature on the outcome of maxillary overdentures according to the number of dental implants in edentulous patients. Materials and Methods: A systematic bibliographic search was carried out in the Pubmed, Scopus and Web of Science search engines and, after appliying the criteria and filters, 6 articles were used. Of the 6 articles analyzed, 4 were randomized clinical trial type studies, 1 prospective study and 1 retrospective study. Results: The results of maxillary overdentures, according to the number of implants used to support them, and comparing the most widespread and researched protocols such as All-on-4 and All-on-6, were similar. They are considered optimal, reliable, successful and long-lived, with no significant difference within the number of dental implants placed. Conclusions: Maxillary overdentures supported by 4 or 6 implants were reliable, and exhibit comparable results. The complications were limited, and the results were optimal and enduring.

Infiltrantes para tratamiento estético de lesiones de manchas blancas por fluorosis: Reporte de caso / Infiltrants for Aesthetic Treatment of White Spots Lesions by Fluorosis: Case Report

Resumen La fluorosis dental es una anomalía en el desarrollo del esmalte debido a la excesiva ingesta de flúor durante la formación de los tejidos dentales, y se caracteriza principalmente por la hipomineralización y mayor porosidad de la estructura del esmalte. Muchas veces las manchas ocasionadas por la fluorosis dental pueden comprometer la estética del paciente y afectar su autoestima. En años recientes ha sido desarrollado una nueva generación de materiales odontológicos conocida como infiltrantes resinosos, que básicamente son resinas de baja viscosidad que infiltran y paralizan la progresión de las lesiones cariosas incipientes no cavitadas. Cuando infiltrantes resinosos han sido utilizados para detener las lesiones cariosas se ha verificado que también producen cambios en la apariencia de la mancha blanca, atenuándola o tornándola imperceptible. El presente artículo describe un reporte de caso del uso de infiltrantes resinosos para tratamiento estético de lesiones de manchas blancas ocasionadas por fluorosis.

Abstract Dental fluorosis is an abnormality in the development of enamel due to the excessive intake of fluoride during formation of dental tissues, mainly characterized by hypomineralization and increased porosity of the enamel structure. Oftenly the spots caused by dental fluorosis can compromise the aesthetics of the patient and affect their self-esteem. In recent years a new generation of dental materials has been developed, known as resin infiltrants, which are basically low viscosity resins that infiltrate and paralyze the progression of incipient non cavitated carious lesions. When resin infiltrants have been used to stop carious lesions it has been verified that they also produce changes in the appearance of white spots, masking or making them imperceptible. The present article describes a case report of the use of resin infiltrants for aesthetic treatment of white spot lesions caused by fluorosis.

Comparación de la profundidad de polimerización de resinas compuestas bulk fillobtenida con dos unidades de fotoactivación LED: polywaveversus monowave / Depth of cure comparison of bulk-fill resin composites with two LED light-curing units: polywave versus monowave

Objetivo. Comparar la profundidad de polimerización de tres resinas compuestas bulk fill obtenida con dos unidades de fotoactivación LED (polywave versus monowave). Mé-todos. Con las resinas compuestas bulk fill: Filtek One Bulk Fill Restorative (FO) (3M ESPE), Tetric N-Ceram Bulk Fill (TNC) (Ivoclar Vivadent) y Opus Bulk Fill APS (OP) (FGM), fueron confeccionados cuerpos de prueba (n = 5) de formato cilíndrico (4 mm diámetro y 10 mm altura) para la evaluación de la profundidad de polimerización según la norma ISO 4049. Fueron empleadas dos unidades de fotoactivación LED de diferentes tecnologías: Bluephase N (Tecnología Polywave - Ivoclar Vivadent) y LED D (Tecnología Monowave - Woodpecker) con densidad de energía de 24 J/cm2. Los datos fueron analiza-dos por medio del análisis de la varianza de dos factores y la prueba post hoc de Tukey (α = 5%). Resultados. LED D produjo mayores valores de profundidad de polimerización en todas las resinas compuestas bulk fill evaluadas (p < 0,05). Los valores obtenidos con Bluephase N fueron: 3,87 (TNC) > 3,74 (FO) > 3,31 (OP) y con LED D fueron 4,29 (TNC) > 4,11 (FO) > 3,92 (OP). Conclusiones. La unidad de fotoactivación LED de tecnología monowave produjo mayor profundidad de polimerización que la de tecnología polywave, independientemente de la resina compuesta bulk fill utilizada. Las resinas com-puestas tuvieron diferentes valores de profundidad de polimerización.Palabras clave: Resinas compuestas; Polimerización; Propiedades físicas y químicas; Ma-teriales dentales; Odontología (fuente: DeCS BIREME).

Objective. To compare the depth of cure of three bulk-fill resin composites using polywave vs. monowave LED light-curing units. Methods. Cylindrical specimens (4 mm diameter and 10 mm height) were prepared using resin composites: Filtek One Bulk Fill Restorative (FO) (3M ESPE), Tetric N-Ceram Bulk Fill (TNC) (Ivoclar Vi-vadent) and Opus Bulk Fill APS (OP) (FGM), to evaluate the depth of cure according to ISO 4049 standard (n = 5). Two LED light-curing units were used: Bluephase N (Polywave, Ivoclar Vivadent) and LED D (Monowave, Woodpecker) with 24 J/cm2 of energy density. Data were analyzed by two-way Analysis of Variance and Tukey's post hoc test (α = 5%). Results. LED D group showed higher depth of cure values in all resin composites evaluated (p < 0.05). The values were: Bluephase N: 3.87 (TNC) > 3.74 (FO) > 3.31 (OP), and LED D: 4.29 (TNC) > 4.11 (FO) > 3.92 (OP). Conclu-sions. The monowave LED light-curing unit produced greater depth of cure than the polywave, regardless of the bulk-fill resin composite used. Resin composites showed different depth of cure values.

Effect of zinc-doping in physicochemical properties of dental adhesives.

PURPOSE: To evaluate changes in the physicochemical properties, water sorption (WS), solubility (SO), modulus of elasticity (E), ultimate tensile strength (UTS), and microhardness (MH) tests were undertaken in zinc-doped dental adhesives. METHODS: Two bonding resins, Adper Single Bond Plus (SB) and Clearfil SE Bond (SEB), were zinc-doped by mixing them with 5, 10 or 20 wt% of ZnO powder, or with 1 or 2 wt% ZnCl2. Resin disks were made of each adhesive blend for the evaluation of WS, SO, and MH, and dumbbell-shaped specimens were prepared for E and UTS testing. RESULTS: An increase in WS and SO was observed for adhesives doped with ZnCl2. A reduction in WS was observed for the adhesive blends containing 10% or 20 wt% ZnO, while the SO was not altered in any of the ZnO-doped adhesives. An increase in E values was observed only for the SB adhesive doped with ZnCl2. For SEB-blends, the incorporation of zinc compounds did not alter the E values. UTS values decreased when SEB was doped with ZnO. SB-blends doped with 20 wt% ZnO significantly increased their MH, and the addition of zinc to the SEB-blends augmented the MH values in all cases.

Fotoativação na atualidade: conceitos e técnicas clínicas / Photoactivation in actuality: concepts and clinical techniques

A odontologia adesiva tem guiado bastante a reabilitação estética dos dentes, especialmente no que se refere às restaurações diretas e indiretas. Desse modo, os materiais resinosos (adesivos, resinas compostas e cimentos resinosos), fotoativados ou duais, são bastante utilizados na clínica odontológica e dependem de maneira essencial de correta fotoativação. Vários são os aparelhos fotoativadores e as técnicas de fotoativação, fazendo com que o dentista necessite saber qual fonte de luz e técnica são mais adequadas para a situação clínica em questão. O objetivo do presente estudo é apresentar os conceitos sobre fotoativação e aparelhos fotoativadores, bem como as técnicas clínicas para sua aplicação nos materiais resinosos utilizados na odontologia

Adhesive dentistry has guided the esthetic rehabilitation of the teeth, especially with direct and indirect restorations. In this sense, resin materials (adhesives, resin composites and resin cements), photoactivated or dual-cured, are often used in dental clinics and depend on an adequate photocuring. There are many light curing and photoactivation techniques, causing the dentist the need to know which source of light and technique are most appropriate for the clinical situation in question. Thus, the aim of the present work is to show the concepts of photocuring and light curing units, as well as photoactivation techniques for the resin materials used in dentistry

Chemical interaction of 10-MDP (methacryloyloxi-decyl-dihydrogen-phosphate) in zinc-doped self-etch adhesives.

OBJECTIVES: Zinc-doped dentine adhesives have been recently advocated to interfere with metallo-proteinases-mediated collagen degradation. Nevertheless, there is a little information about the effects of zinc ions on the chemical interaction of self-etch functional monomers to dentine. The aim of this study was to assess if the inclusion of zinc into the primers of self-etch adhesives containing MDP (10-methacryloyloxi-decyl-dihydrogen-phosphate) may interfere with their chemical interaction to calcium/dentine. METHODS: Caries-free human molars were bonded using two commercial self-etching adhesives [Clearfil SE bond (CSE) and S3 bond (S3)] doped with zinc nitrate and submitted to microtensile bond strength (µTBS) and interface nanoleakage evaluation. Moreover, MDP was synthesised to evaluate the chemical interaction with calcium/dentine through atomic absorption spectroscopy (AAS) and SEM-EDX in the presence or absence of zinc ions. RESULTS: AAS showed increasing formation of MDP-zinc rather than MDP-calcium salts (p=0.002) in the presence of zinc. SEM-EDX confirmed the formation of zinc-rich phosphate deposits that were probably responsible for the significant reduction in µTBS and increased interfacial nanoleakage attained with zinc-doped CSE and S3. CONCLUSION: These outcomes demonstrated that the excessive presence of zinc ions may jeopardise the bonding performance of MDP-containing self-etch adhesives.

Effect of replacing a component of a self-etch adhesive by chlorhexidine on bonding to dentin.

The purpose of this study was to evaluate the effect of replacing a component of the self-etch adhesive Adper Scotchbond SE (liquid A + liquid B) by 2% chlorhexidine (CHX) on bond strength to dentin after 1 day, 3 months or 6 months of water storage. Eight human teeth were sectioned to expose a flat dentin surface and were then randomly assigned to 2 groups. In the control group, the dentin surfaces were treated with the adhesive according to the manufacturer's instructions. In the experimental group, liquid A was replaced by 2% CHX. Next, a 6-mm-high resin composite block was incrementally built on the bonded surfaces. The restored teeth were then sectioned to produce stick-shaped specimens (cross-sectional area - 0.8 mm2). The microtensile bond strength (µTBS) was recorded, and the failure modes were assessed. Data were analyzed by two-way repeated measures ANOVA (α=0.05). Four additional teeth were processed in order to conduct a micromorphological analysis of the resin-dentin interface. The µTBS values did not significantly decrease after water storage in either the control or the experimental group, whose values did not differ significantly irrespective of storage time. The morphological aspect of the bonding interface appears not to have been affected by CHX. A higher incidence of cohesive failures within the adhesive and mixed failures (cohesive within adhesive and resin composite) was observed for both groups. It may be concluded that dentin pre-treatment with 2% CHX did not influence significantly the bonding performance of the evaluated adhesive.

Effect of Replacing a Component of a Self-Etch Adhesive by Chlorhexidine on Bonding to Dentin

The purpose of this study was to evaluate the effect of replacing a component of the self-etch adhesive Adper Scotchbond SE (liquid A + liquid B) by 2% chlorhexidine (CHX) on bond strength to dentin after 1 day, 3 months or 6 months of water storage. Eight human teeth were sectioned to expose a flat dentin surface and were then randomly assigned to 2 groups. In the control group, the dentin surfaces were treated with the adhesive according to the manufacturer's instructions. In the experimental group, liquid A was replaced by 2% CHX. Next, a 6-mm-high resin composite block was incrementally built on the bonded surfaces. The restored teeth were then sectioned to produce stick-shaped specimens (cross-sectional area - 0.8 mm2). The microtensile bond strength (µTBS) was recorded, and the failure modes were assessed. Data were analyzed by two-way repeated measures ANOVA (α=0.05). Four additional teeth were processed in order to conduct a micromorphological analysis of the resin-dentin interface. The µTBS values did not significantly decrease after water storage in either the control or the experimental group, whose values did not differ significantly irrespective of storage time. The morphological aspect of the bonding interface appears not to have been affected by CHX. A higher incidence of cohesive failures within the adhesive and mixed failures (cohesive within adhesive and resin composite) was observed for both groups. It may be concluded that dentin pre-treatment with 2% CHX did not influence significantly the bonding performance of the evaluated adhesive.

O objetivo deste estudo foi o de avaliar o efeito da substituição de um componente do adesivo autocondicionante Adper Scotchbond SE (líquido A + líquido B) por clorexidina (CHX) a 2% na resistência da união à dentina após 1 dia, 3 meses ou 6 meses de armazenamento em água. Oito dentes humanos foram seccionados para expor uma superfície plana de dentina e, em seguida, foram aleatoriamente divididos em dois grupos. No grupo controle, as superfícies de dentina foram tratadas com o adesivo de acordo com as instruções do fabricante. No grupo experimental, o líquido A foi substituído por CHX a 2%. Em seguida, um bloco de resina composta com 6 mm de altura foi construído sobre a superfície de união. Os dentes restaurados foram então seccionados para produzir espécimes em forma de palito (área transversal - 0,8 mm2). A resistência da união à microtração (µT) foi mensurada e os padrões de fratura avaliados. Os dados foram analisados por meio de teste de ANOVA dois critérios de medidas repetidas (α=0,05). Quatro dentes adicionais foram processados a fim de realizar uma análise micromorfológica da interface resina-dentina. Os valores de µT não diminuíram significativamente após armazenamento em água em ambos os grupos controle e experimental, cujos valores não diferiram significativamente entre si independentemente do tempo de armazenamento. O aspecto morfológico da interface adesiva parece não ter sido afetado pela CHX. Uma maior incidência de falhas coesivas no adesivo e falhas mistas (coesivas no adesivo e na resina composta) foi observada em ambos os grupos. Pode-se concluir que o pré-tratamento da dentina com CHX a 2% não influenciou significativamente o desempenho do adesivo avaliado.