Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 142
Filter
1.
Rev. ADM ; 79(1): 20-27, ene.-feb. 2022. ilus, tab
Article in Spanish | LILACS | ID: biblio-1361506

ABSTRACT

Los sistemas cementantes han mejorado notablemente, los objetivos que persiguen los nuevos cementos es que la adhesión sea duradera y conseguir siempre que sea posible una interface cerrada con un sellado perfecto. Se han podido desarrollar nuevas técnicas y nuevos materiales de cementación que han ido perfeccionando la unión del material restaurador al diente. En el presente estudio se compara la fuerza de adhesión a dentina de cementos de autograbado y cementos de grabado total para comprobar los efectos positivos en el grabado de la dentina. Para el estudio se utilizaron dos cementos a base de resina (RelyX U200 Clicker 3M y RelyX Ultimate 3M). Se encapsularon 40 molares en acrílico en dos grupos de 20 muestras para la aplicación de dos sistemas cementantes de autograbado (grupo 1) y de grabado total (grupo 2), respectivamente, se desgastaron hasta descubrir la dentina; siguiendo las especificaciones del fabricante se colocó el cemento en cada grupo, y después se sometieron a pruebas de cizalla en una máquina de ensayo universal Instron. La medida expresada en megapascales (MPa) fue: grupo 1 = 7.5569 y grupo 2 = 12.6444. En este caso fueron analizados dos grupos, tomándose la primera significancia bilateral. Se realiza la prueba en t de Student, con 95% de intervalo de confianza en la diferencia, demostrando así que el cemento RelyX Ultimate 3M tiene mayor fuerza de adhesión que el cemento RelyX U200 Clicker 3M. Nuestra investigación fue factible y llegamos a nuestro propósito, en el cual comprobamos la mayor adhesión de cementos de grabado total, los cuales son sometidos a un previo tratamiento del diente (AU)


Subject(s)
Humans , Adolescent , Adult , Acid Etching, Dental , Cementation , Dentin-Bonding Agents , Resin Cements , Shear Strength , Tensile Strength , Statistical Analysis , Dentin/drug effects
2.
Braz. dent. sci ; 25(1): 1-9, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1361885

ABSTRACT

Objetivo: O objetivo foi avaliar a resistência de união de seis adesivos experimentais contendo sistemas fotoiniciadores binários ou ternários, associados a três diferentes concentrações de MDP (0-12% em peso) após 12 meses de armazenamento em água destilada. Material e Métodos: Adesivos experimentais foram preparados com: bis-GMA, UDMA, bis-EMA, TEGDMA, HEMA, BHT e etanol, contendo sistemas fotoiniciadores binários (CQ/amina) ou ternários (CQ/amina/DPIHFP ­ 0,5% em peso). Foi adicionado a esta composição 0%, 6% ou 12% em peso de MDP. Os sistemas adesivos foram aplicados seguindo o protocolo com condicionamento ácido. Moldes cilíndricos transparentes foram colocados sobre a dentina hibridizada, preenchidos com resina composta e fotopolimerizados. Os corpos-de-prova foram armazenados em água destilada a 37oC por 24h ou 12 meses e submetidos ao ensaio de microcisalhamento (n=6). Os dados foram analisados por ANOVA de três fatores e teste de Tukey (α=5%). Resultados: Para o sistema binário, após 12 meses de armazenamento, todos os valores de resistência de união foram semelhantes. Em relação à degradação da resistência de adesão ao longo do tempo, as formulações de MDP de 6% e 12% mostraram resistência de união mais estável do que 0% de MDP. Para o sistema ternário, todas as formulações (0%, 6% e 12% em massa de MDP) mostraram resistência de união estável em função do tempo. Conclusão: Para o sistema binário, as concentrações de 6 e 12% em massa de MDP foram capazes de manter a resistência de união em função do tempo, enquanto que para o sistema ternário, a estabilidade de união foi obtida independentemente da concentração de MDP. Pode-se concluir que, para a formulação dos adesivos utilizados neste estudo, independente do sistema fotoiniciador, a concentração de 12% MDP apresentou valores de resistência de união mais estáveis após 12 meses de armazenamento em água (AU)


Objective: The aim was to evaluate the bond strength of six experimental adhesives containing binary or ternary photoinitiator systems, associated with three different MDP concentrations (0-12wt%) after 12 months of storage in distilled water. Material and Methods: Experimental adhesives were prepared with: bis-GMA, UDMA, bis-EMA, TEGDMA, HEMA, BHT, and ethanol, containing binary (CQ/amine) or ternary (CQ/amine/DPIHFP (diphenyliodonium hexafluorophosphate) ­ 0.5wt%) photoinitiator systems. It was added to this composition 0wt%, 6wt%, or 12wt% of MDP. The adhesive systems were applied following the etch-and-rinse protocol. Transparent cylindrical molds were placed on the hybridized dentin, filled with composite resin and light-cured. The specimens were stored in distilled water at 37oC for 24h or 12 months and submitted to a microshear bond strength test (n=6). Data were analyzed by three-way ANOVA and Tukey's test (α=5%). Results: For the binary system, after 12 months of storage, all bond strength values were similar. Regarding bond strength degradation over time, 6wt% and 12wt% MDP formulations showed more stable bond strength than 0wt% MDP. For the ternary system, all formulations (0wt%, 6wt% and 12wt%) showed stable bond strength over time. Conclusion: For the binary photoinitiator system, the 6wt% and 12wt% MDP concentrations were able to keep bond strength stable over time, while for the ternary system, bond strength stability was achieved regardless the MDP concentration. (AU)


Subject(s)
Dental Cements , Photoinitiators, Dental
3.
Braz. j. oral sci ; 20: e210445, jan.-dez. 2021. ilus
Article in English | LILACS, BBO | ID: biblio-1253016

ABSTRACT

Aim. To evaluate the bond durability of two universal adhesives; mild and ultra-mild in both etch-and-rinse and self-etch modes after simulated in-vitro degradation by long-term water storage or thermocycling. Methods. A total of 144 specimens were used in this study; 120 specimens (prepared from 30 teeth) for microshear bond strength testing and fracture mode assessment, and 24 specimens for scanning electron microscopic evaluation (prepared from 24 teeth). Specimens were prepared from 54 recently extracted caries free third molars and randomly divided into 12 groups, according to the adhesive treatment (All Bond or Scotchbond Universal), etching mode (etch-andrinse or self-etch) and aging method (thermocycling or water storage). Each tooth was sectioned mesio-distally into two halves exposing free dentin surface for bonding where dentin substrate 1 mm below the dentino-enamel junction was used. After adhesive application and composite build up, specimens were tested in shear mode after storing in distilled water at 37˚C for 24 hours or 1 year, or after being thermocycled between 5 and 55 °C for 10,000 cycles (n=10). Microshear bond strength (µSBS) was tested using a universal testing machine. Adhesive-dentin interface was examined using scanning electron microscope (SEM) (n=2). Data were analyzed using 3 way AN0VA and pairwise comparisons was performed using Bonferroni correction at significance level of α ≤0.05. Results. Statistical analysis revealed non-significant difference for etching mode in both adhesives (p=0.596). After aging, the bond strength was only reduced in Scotchbond Universal after one year of water storage in both modes (p<0.001). SEM evaluation revealed intact hybrid layer and longer resin tags for etch-and-rinse mode than selfetch mode of both adhesives. Conclusion. The bond strength of universal adhesives is not affected by the etching mode, however its durability was shown to be material dependent


Subject(s)
Dental Bonding , Dental Cements , Dentin
4.
Braz. j. oral sci ; 20: e213641, jan.-dez. 2021. ilus
Article in English | LILACS, BBO | ID: biblio-1254539

ABSTRACT

Aim: To review the current literature regarding the bond strength of self-adhesive flowable resin composites (SAFRCs) to tooth structure, comparing the outcomes with conventional flowable resin composites (CFRCs). Methods: PubMed/Medline, EbscoHost and Scopus databases were screened (last update on November 2020) using related Medical Subject Headings (MeSH) and free terms. We included in vitro studies published in English language comparing the bond strength of SAFRCs and CFRCs to enamel and/or dentin from primary and/or permanent teeth. Results: In total, 23 articles were included. Unlike CFRCs, SAFRCs such as Vertise® Flow and Fusio™ Liquid Dentin exhibited statistically lower bond strength to enamel and dentin from permanent teeth. There were limited studies comparing the enamel bond strength of CFRCs and SAFRCs (prior phosphoric acid etching and/or adhesive system use). Also, we found few studies that evaluated the bonding effectiveness of Constic® and other SAFRCs to primary teeth. Conclusions: Current SAFRCs showed low bond strength to permanent teeth, which impedes to recommend them as a reliable alternative to CFRCs. The bonding performance of Constic® on both hard dental tissues should be evaluated on future studies. Also, more evidence assessing the bond strength of SAFRCs to primary teeth and etched enamel is needed


Subject(s)
Dental Bonding , Composite Resins , Systematic Reviews as Topic
5.
Odontol. sanmarquina (Impr.) ; 24(1): 69-74, Ene-Mar. 2021.
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1150872

ABSTRACT

El intervalo de tiempo trascurrido pos aclaramiento dentario es una variable significativa para la adhesión a la estructura dentaria. Los agentes aclaradores utilizados sobre la superficie del esmalte, debido a la degradación de los peróxidos empleados generan radicales libres de oxígeno que alteran la fuerza de adhesión. La literatura ha demostrado que el tiempo trascurrido desde un aclaramiento hasta el momento de la restauración es determinante para la adhesión al esmalte. El objetivo de este trabajo fue hacer una revisión de literatura sobre la influencia del tiempo pos aclaramiento dental y su efecto en la fuerza de adhesión al esmalte dental de las resinas compuestas. Para la recopilación de datos se utilizaron las siguientes bases de datos: SciELO, EBSCO y repositorios académicos, obteniéndose 36 artículos y tesis. Después del análisis, se puede considerar que el tiempo es determinante en la resistencia adhesiva y que las alteraciones posteriores al aclaramiento dentario se extienden hasta la semana posterior prolongándose inclusive hasta cuatro semanas, tiempo que la literatura estima necesario para la eliminación del oxígeno residual.


The time interval after tooth bleaching is a significant variable for the adhesion to the tooth structure. The bleaching agents used on the enamel surface, due to the degradation of the peroxides used, generate oxygen free radicals that alter the bonding strength. The literature has shown conclusively that the time that has elapsed since a bleaching to the moment of restoration is decisive for the adhesion to the enamel. The objective of this work was to review the literature about the influence of time after dental bleaching and its effect on the strength of adhesion to enamel of composite resins. Data collection was carried out through electronic databases such as: Scielo, EBSCO, academic repositories, obtaining 36 articles and thesis. After the analysis, it can be considered that time is decisive in the adhesive resistance and that the alterations after tooth bleaching extend until the subsequent week, lasting up to four weeks, a time that the literature considers necessary for the elimination of residual oxygen.

6.
Braz. dent. sci ; 24(4, suppl 1): 1-12, 2021. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1349346

ABSTRACT

Objective: The objective of this double-blind, randomized controlled clinical trial was to evaluate the clinical performance of two methacrylate-based flowable composite and ormocer-based flowable composite in non-carious cervical lesions (NCCLs) of adult patients. Material and Methods: 183 restorations were performed on NCCLs using the Futurabond U adhesive system, applied in the selective enamel etching mode in all cavities. After the adhesive application, the cavities were restored with one out of the three evaluated flowable composites (n = 61 per group): ormocer-based flowable composite (Admira Fusion Flow, ORM), low viscosity methacrylate-based composite (GrandioSO Flow, LV) and high viscosity methacrylate-based composite (GrandioSO Heavy Flow, HV). After 12 months of clinical performance, these restorations were evaluated according to FDI and USPHS criteria in the following items: retention/fracture, marginal adaptation, marginal staining, postoperative sensitivity and caries recurrence. Results: eight restorations were lost/fractured after 12 months of clinical evaluation (1 in the ORM and 7 in the HV group). The retention rates for 12- months (95% confidence interval) were 98.4% (91.3%-99.7%) for the ORM group, 100% (94.5%-100%) for the LV group and 88.5% (78.1%-94.3%) for the HV group, with no statistical difference identified between any pair of groups (p > 0.05). Five restorations presented small marginal adaptation defects at the 12-months evaluation recall, and all of them were considered clinically acceptable. Conclusion: The clinical performance of the universal adhesive associated to ormocer-based or methacrylate-based flowable composite were found to be promising after 12-month of clinical evaluation (AU)


Objetivo: O objetivo deste estudo clínico duplo-cego randomizado foi comparar as taxas de retenção de um compósito fluido à base de Ormocer versus dois compósitos fluidos à base de metacrilato quando utilizados em lesões cervicais não cariosas (LCNCs) de pacientes adultos. Material e Métodos: 183 restaurações foram realizadas em LCNCs utilizando o sistema adesivo Futurabond U, aplicado no modo de condicionamento seletivo do esmalte em todas as cavidades. Após a aplicação do adesivo, as cavidades foram restauradas com um dos três compósitos fluidos avaliados (n = 61 por grupo): compósito fluido à base de ormocer (Admira Fusion Flow, ORM), compósito à base de metacrilato de baixa viscosidade (GrandioSO Flow, LV) e compósito à base de metacrilato de alta viscosidade (GrandioSO Heavy Flow, HV). Após 12 meses de desempenho clínico, essas restaurações foram avaliadas de acordo com os critérios FDI e USPHS nos seguintes itens: retenção / fratura, adaptação marginal, coloração marginal, sensibilidade pós-operatória e recorrência de cárie. Resultados: oito restaurações foram perdidas / fraturadas após 12 meses de avaliação clínica (1 no grupo ORM e 7 no grupo HV). As taxas de retenção por 12 meses (intervalo de confiança de 95%) foram 98,4% (91,3% -99,7%) para o grupo ORM, 100% (94,5% -100%) para o grupo LV e 88,5% (78,1% -94,3%) para o grupo HV, sem diferença estatística identificada entre nenhum par de grupos (p> 0,05). Cinco restaurações apresentaram pequenos defeitos de adaptação marginais no período de avaliação de 12 meses, e todas foram consideradas clinicamente aceitáveis. Conclusão: O desempenho clínico do adesivo universal associado ao compósito fluido à base de ormocer ou metacrilato mostrou-se promissor após 12 meses de avaliação clínica(AU)


Subject(s)
Humans , Adult , Clinical Trial , Dentin-Bonding Agents , Dental Marginal Adaptation , Dental Restoration, Temporary
7.
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1155012

ABSTRACT

ABSTRACT Objective: To investigate the difference of chemical bonds between urethane dimethacrylate (UDMA) bonding agents with ethanol solvent and acetone solvent on dentin collagen. Material and Methods: This experimental comparison study used three groups: G1 (Control): UDMA and collagen; G2: UDMA, collagen and ethanol; and G3: UDMA, collagen and acetone. The groups were then pelleted and analysed with FTIR, then the peak value of carbonyl absorption band from each study group was calculated. The result of FTIR analysis and the peak of carbonyl absorption band (P) was calculated using the formula: P = (BC / AB) X 100; AB. BC is measured in centimeters. The study of chemical bond differences between ethanol-solvent UDMA agents compared with acetone-solvent on dentin collagen resulted in a graph of peak of carbonyl absorption bands of UDMA and dentin collagen groups. To determine the chemical bonds of UDMA from the top of the carbonyl ester absorption bands with wavenumber absorption in range 1700-1750 cm-1, the decreasing peak of the carbonyl absorption bands is assumed as more chemical bonds that formed. Data were analysed using Anova one way and Tukey HSD test. Results: There were significant differences between the three study groups (p<0.05). Conclusion: UDMA bonding agents' chemical bonds with acetone solvent are much higher than the chemical bonds between UDMA bonding agents with ethanol solvent on dentin collagen.


Subject(s)
Dental Bonding , Ethanol/chemistry , Solvents/chemistry , Epidemiology, Experimental , Analysis of Variance , Collagen/chemistry , Dentin
8.
Rev. Fac. Odontol. (B.Aires) ; 36(83): 57-66, 2021. ilus
Article in Spanish | LILACS | ID: biblio-1343658

ABSTRACT

El objetivo de este reporte de caso clínico es presentar una rehabilitación integral adhesiva resuelta por alumnos de grado de la Facultad de Odontología de la Universidad de Buenos Aires (FOUBA), bajo un protocolo de abordaje terapéutico que simplifica su realización. Esta sistematización hace foco en un abordaje completamente aditivo con la finalidad de devolver la salud, la función y la estética de manera predecible. Un paciente de 55 años concurrió a la consulta por motivos estéticos. En el diagnóstico se evidenciaron desgastes severos producto de la parafunción. Se realizó una rehabilitación oral adhesiva seleccionando a la cerámica vítrea como material restaurador. El diagnóstico y la comprensión de su etiología son fundamentales para realizar un tratamiento conservador con restauraciones adheridas y con alto grado de predictibilidad, que se prolongará en el tiempo, gracias a la utilización de una placa orgánica y a los controles de mantenimiento correspondientes (AU)


Subject(s)
Humans , Male , Middle Aged , Bruxism/rehabilitation , Ceramics , Dental Bonding , Esthetics, Dental , Patient Care Planning , Periodontitis/therapy , Argentina , Schools, Dental , Dental Cavity Preparation , Conservative Treatment , Inlays , Mouth Rehabilitation
9.
J. appl. oral sci ; 29: e20201031, 2021. tab, graf
Article in English | LILACS | ID: biblio-1250189

ABSTRACT

Abstract Fixed orthodontic appliances may lead to biofilm accumulation around them that may increase caries risk. This study aimed to evaluate the influence of quaternary ammonium methacrylates (QAMs) on the physicochemical properties, cytotoxicity, and antibacterial activity of adhesive resins for orthodontic purposes. Methodology: A base resin was prepared with a comonomer blend and photoinitiator/co-initiator system. Two different QAMs were added to the base adhesive: dimethylaminododecyl methacrylate at 5 wt.% (DMADDM) or dimethylaminohexadecyl methacrylate (DMAHDM) at 10 wt.%. The base adhesive, without QAMs, (GC) and the commercial Transbond™ XT Primer 3M (GT) were used as control. The resins were tested immediately and after six months of aging in the water regarding the antibacterial activity and shear bond strength (SBS). The antibacterial activity was tested against Streptococcus mutans via metabolic activity assay (MTT test). The groups were also tested for the degree of conversion (DC) and cytotoxicity against keratinocytes. Results: The resins containing QAM showed antibacterial activity compared to the commercial material by immediately reducing the metabolic activity by about 60%. However, the antibacterial activity decreased after aging (p<0.05). None of the groups presented any differences for SBS (p>0.05) and DC (p>0.05). The incorporation of DMADDM and DMAHDM significantly reduced the keratinocyte viability compared to the GT and GC groups (p<0.05). Conclusion: Both adhesives with QAMs showed a significant reduction in bacterial metabolic activity, but this effect decreased after water aging. Lower cell viability was observed for the group with the longer alkyl chain-QAM, without significant differences for the bonding ability and degree of conversion. The addition of QAMs in adhesives may affect the keratinocytes viability, and the aging effects maybe decrease the bacterial activity of QAM-doped materials.


Subject(s)
Orthodontic Brackets , Streptococcus mutans , Materials Testing , Biofilms , Resin Cements , Dental Cements , Methacrylates , Anti-Bacterial Agents
10.
Article in Chinese | WPRIM | ID: wpr-873686

ABSTRACT

@#Dental bonding technology and materials have been used widely in dentistry because of their excellent properties. The development of novel bonding technology and materials is constantly being performed to improve the effect of dental bonding restorations. Observation and analysis of the dental bonding interface is one of the most important methods for laboratory evaluation of bonding efficiency. This paper aims to review the methods of observation and analysis of dental bonding interfaces to provide a reference for the selection of evaluation methods in dental bonding research. The features of 6 methods, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), Raman spectroscopy (RS), optical coherence tomography (OCT) and atomic force microscopy (AFM), were described and summarized. Among these methods, SEM and TEM are used most often in the analysis of fine structures; CLSM and OCT are used for the acquisition of characteristic image signals, such as microleakage and exogenous and endogenous fluorescence; and RS and AFM can test chemical composition and mechanical properties.

11.
Rev. cuba. invest. bioméd ; 39(4): e683, oct.-dic. 2020. tab, graf
Article in Spanish | LILACS, CUMED | ID: biblio-1156456

ABSTRACT

Objetivo: Determinar las propiedades antimicrobianas de la incorporación de nanopartículas de óxido de zinc y cobre en un adhesivo de grabado y lavado total sobre Streptococcus mutans en pacientes con restauraciones de resina compuesta confeccionadas con adhesivo cargado. Métodos: Estudio experimental, randomizado, la muestra estuvo conformada por 25 pacientes, de ambos sexos, pertenecientes al posgrado de Ortodoncia de la Facultad de Odontología de la Universidad de Chile, en los cuales se confirmó presencia de Streptococcus mutans en saliva. Se confeccionaron restauraciones de resina compuesta oclusales, en premolares superiores con indicación de exodoncia por el tratamiento de ortodoncia, con adhesivo cargado (cuya composición fue 5/0,2 por ciento ZnO y Cu, respectivamente) y control (sin presencia de nanopartículas en su composición), según el listado de aleatorización. Se tomaron muestras microbiológicas en tres tiempos con la técnica de la cubeta (antes, 1 semana y 4 semanas posterior a la confección de las restauraciones). Se obtuvieron, aislaron e identificaron colonias de Streptococcus mutans a partir de las muestras obtenidas. Se usó el test de Mann-Whitney mediante el paquete estadístico SPSS v.21 Resultados: El promedio del recuento de UFC de Streptococcus mutans en el grupo experimental fue mayor posterior a la confección de las restauraciones de resina compuesta. Los resultados de la identificación molecular por PCR demuestran la presencia de Streptococcus mutans en 20 de 25 muestras. Conclusiones: No existen diferencias en el recuento de Streptococcus mutans antes y después de la aplicación del adhesivo sobre las restauraciones de resina compuesta(AU)


Objective: To determine the antimicrobial properties of the incorporation of zinc and copper oxide nanoparticles in an etching and total wash adhesive on Streptococcus mutans in patients with composite resin restorations made with loaded adhesive. Methods: Experimental and randomized trial, the sample were 25 patients, of both sexes, belonging to the FOUCH Orthodontic postgraduate program, in whom the presence of Streptococcus mutans in saliva was confirmed. Occlusal composite resin restorations were made in upper premolars with indication of extraction by orthodontic treatment, with loaded adhesive (whose composition is 5 / 0.2% ZnO and Cu respectively) and control (without the presence of nanoparticles in their composition), according to the scrambling listing. Microbiological samples were taken in three stages with the cuvette technique (before, 1 week and 4 weeks after the restoration was made). Colonies of Streptococcus mutans were obtained, isolated and identified from the samples obtained. The statistical analysis used the SPSS v.21 software, the data was analyzed by Mann Whitney test Results: The average CFU count of Streptococcus mutans in the experimental group (adhesive modified with zinc oxide and copper nanoparticles) was higher after the fabrication of composite resin restorations. The results of molecular identification by PCR demonstrate the presence of Streptococcus mutans in 20 of 25 samples. Conclusions: There are no differences in the count of Streptococcus mutans before and after the application of the adhesive on the composite resin restorations(AU)


Subject(s)
Humans , Male , Female , Streptococcus mutans/growth & development , Colony Count, Microbial/methods , Dental Cements/therapeutic use , Metal Nanoparticles/standards
12.
Braz. oral res. (Online) ; 34: e020, 2020. tab, graf
Article in English | LILACS | ID: biblio-1089398

ABSTRACT

Abstract: This in vitro study aimed to assess the effects of different pretreatments used to adapt glass-fiber posts cemented to root canals with different resin cements, regarding porosity percentage and bond strength. Twelve bovine incisor roots were prepared with Largo drills. After post space preparation, the specimens were randomized into two types of pretreatment groups (n = 3): water-wet bonding and ethanol-wet bonding. After the post were cemented, the roots were stored in 100% humidity at room temperature for 7 days. The samples were scanned by microcomputed tomography (micro-CT). Images were reconstructed by NRecon software, and CTAn software was used to analyze the porosity percentage (%) at the luting interface. Evaluation of the push-out bond strength was performed by serially cutting the roots, and submitting the slices to testing. Additionally, the resin cement post-gel shrinkage values (%) were measured using the strain-gauge method (n = 10). Data were analyzed by two-way ANOVA, Tukey's test and Student's t test (a = 0.05). The roots prepared with ethanol-wet bonding using RelyX™ U200 had significantly lower porosity in the coronal and apical thirds (p < 0.05). The group prepared with ethanol-wet bonding using RelyX™ ARC presented better bond strength results in the coronal and apical thirds (p < 0.05). RelyX™ ARC (0.97%) produced a higher post-gel shrinkage value than RelyX™ U200 (0.77%). Canals pretreated with ethanol-wet bonding presented better outcomes in regard to porosity percentage and push-out bond strength.


Subject(s)
Animals , Cattle , Tooth Root/drug effects , Post and Core Technique , Dentin-Bonding Agents/pharmacology , Resin Cements/chemistry , Ethanol/pharmacology , Root Canal Irrigants/chemistry , Materials Testing , Cattle , Porosity , Dental Bonding , Dental Materials/chemistry , Dental Pulp Cavity , X-Ray Microtomography , Glass
13.
Braz. oral res. (Online) ; 34: e105, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132706

ABSTRACT

Abstract The aim of this research was to evaluate the influence of MDP (10-methacryloyloxydecyl dihydrogen phosphate) concentration and application mode of experimental adhesives on microshear bond strength (μSBS) to dentin after storage in distilled water at 37°C for 24h and 6 months. Five experimental adhesives were prepared with: CQ, DABE, BHT, ethanol, HEMA, TEGDMA, Bis-EMA, UDMA, and Bis-GMA. Concentrations of 0 wt%, 3 wt%, 9 wt%, 12 wt% or 15 wt% of MDP were added to their composition. The adhesives were applied to flat dentin surfaces in etch-and-rinse or self-etching modes. Cylindrical molds filled with light-cured composite resin were placed above the dentin. The specimens were stored in distilled water at 37oC for 24h or 6 months and submitted to μSBS testing. The adhesives were also submitted to pH analysis. The data were analyzed by one-way ANOVA, three-way ANOVA and Tukey's test (α = 5%). All the adhesives used in the etch-and-rinse mode showed significantly higher bond strength than the adhesives applied in the self-etching approach. The 9 wt% adhesive showed the highest bond strength values, and 3 wt% was most stable after storage. A strong negative correlation between MDP concentration and pH was observed. It was concluded that the formulations with low concentrations of MDP (up to 9 wt%) showed better results for bond strength and bond strength degradation over time.


Subject(s)
Dental Bonding , Tensile Strength , Materials Testing , Adhesiveness , Dentin-Bonding Agents , Composite Resins , Resin Cements , Dental Cements , Dentin
14.
J. appl. oral sci ; 28: e20190371, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1056595

ABSTRACT

Abstract Objective This study aims to evaluate the influence of different air-abrasion pressures and subsequent heat treatment on the flexural strength, surface roughness, and crystallographic phases of highly translucent partially stabilized zirconia (Y-PSZ), and on the tensile bond strength of resin cement to Y-PSZ. Methodology Fully sintered zirconia specimens were ground with SiC paper (control) and/or air-abraded with 50 µm particles of alumina at 0.1, 0.15, 0.2, or 0.3 MPa or left as-sintered. After air-abrasion at 0.2 MPa (0.2AB), additional specimens were then heated to 1500°C, and held for one hour at this temperature (0.2AB+HT1h). Flexural strength and surface roughness were evaluated. Crystalline phase identification was also carried out using X-ray diffraction. Bonded zirconia specimens with self-adhesive resin cement were stored in distilled water at 37°C for 24 h, either with or without aging (thermal cycling 4-60°C/20000). Results were analyzed statistically by ANOVA and Tukey-Kramer tests. Results The flexural strength decreased with the increase in air-abrasion pressure, while in contrast, the surface roughness increased. The lowest flexural strength and the highest roughness value were found for the 0.2AB and 0.3AB groups, respectively. All groups contained cubic-, tetragonal ( t )-, and rhombohedral ( r )-ZrO2 phases with the exception of the as-sintered group. Upon increasing the air-abrasion pressure, the relative amount of the r -ZrO2 phase increased, with a significant amount of r -ZrO2 phase being detected for the 0.2AB and 0.3AB groups. The 0.2AB+HT1h group exhibited a similar flexural strength and t -ZrO2 phase content as the as-sintered group. However, the 0.2AB group showed a significantly higher tensile bond strength (p<0.05) than the 0.2AB+HT1h group before and after aging. Conclusion Micromechanical retention by alumina air-abrasion at 0.2 MPa, in combination with chemical bonding of a resin to highly translucent Y-PSZ using a MDP-containing resin cement may enable durable bonding.


Subject(s)
Zirconium/chemistry , Dental Bonding/methods , Resin Cements/chemistry , Air Abrasion, Dental/methods , Aluminum Oxide/chemistry , Reference Values , Surface Properties , Tensile Strength , X-Ray Diffraction/methods , Materials Testing , Reproducibility of Results , Analysis of Variance , Microscopy, Confocal/methods , Flexural Strength , Hot Temperature
15.
Braz. j. oral sci ; 19: e201574, jan.-dez. 2020. ilus
Article in English | LILACS, BBO | ID: biblio-1116249

ABSTRACT

Aim: To evaluate the retention of Y-TZP crowns cemented in aged composite cores ground with burs of different grit sizes. Methods: Sixty composite resin simplified full-crown preparations were scanned, while 60 Y-TZP crowns with occlusal retentions were milled. The composite preparations were stored for 120 days (wet environment-37°C) and randomly distributed into three groups (n=20) according to the type of composite core surface treatment. The groups were defined as: CTRL (control: No treatment), EFB (extra-fine diamond bur [25µm]), and CB (coarse diamond bur [107µm]). The grinding was performed with an adapted surveyor standardizing the speed and pressure of the grinding. The intaglio surfaces on the crowns were air-abraded with silica-coated alumina particles (30 µm) and then a silane was applied. The crowns were cemented with self-adhesive resin cement, thermocycled (12,000 cycles; 5/55°C), stored (120 days) and submitted to a retention test (0.5mm/min). The retentive strength data (MPa) were analyzed using one-way analysis of variance and Tukey test, as well as Weibull analysis. Failures were classified as 50C (above 50% of cement in the crown), 50S (above 50% of cement in the substrate) and COE (composite core cohesive failure). Results: No statistical difference was observed among the retention values (p=0.975). However, a higher Weibull modulus was observed in the CTRL group. The predominant type of failure was 50S (above 50% of cement in the substrate composite). Conclusion: The retention of zirconia crowns was not affected by grinding using diamond burs with different grit sizes (coarse/extra-fine) or when no grinding was performed


Subject(s)
Surface Properties , Zirconium , Dental Bonding , Dental Prosthesis Retention , Composite Resins
16.
Article in Chinese | WPRIM | ID: wpr-798686

ABSTRACT

Objective@#To evaluate the bond performance of primers, universal adhesives and self-adhesive resin cements containing methacryloyloxydecyl dihydrogen phosphate (MDP) to zirconia.@*Methods@#Two hundred and ten yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) plates were prepared and divided into seven groups according to each of six MDP-containing products and one MDP-free resin cement. Two primers, two universal adhesives and two self-adhesive resin cements were applied on the specimens after these specimens recived alumina air abrasion. The group of MDP-free resin cement was set as control. Each group contained 30 specimens. Y-TZP plates were bonded to resin composite to build resin bonding specimens, and half of these plates were stored in distilled water at 37 ℃ for 24 hours, the other half were stored for 12 months. Shear bond strength (SBS) test and fracture modes analysis were performed.@*Results@#The SBS values of all the experimental groups were above 9.51 MPa, which increased 24-hour values compared to the (5.04±0.50) MPa of the control group. Group using one of the self-adhesive resin cement yielded the highest SBS, (11.06±0.84) MPa. SBS of all groups decreased significantly compared to 24-hour SBS after aging (P<0.05), however, the SBS values of MDP-containing products groups can still be maintained above 7.44 MPa. Two self-adhesive cement groups and one of the universal adhesive group maintained higher SBS values, and the values were statistical different from those from the two primer groups (P<0.05) .@*Conclusions@#Different MDP-containing products have different effects on the bond durability of zirconia.

17.
Article in English | WPRIM | ID: wpr-811433

ABSTRACT

PURPOSE: The aim of this study was to evaluate the microshear bond strength (µSBS) of four computer-aided design/computer-aided manufacturing (CAD/CAM) blocks repaired with composite resin using three different surface treatment protocols.MATERIALS AND METHODS: Four different CAD/CAM blocks were used in this study: (1) flexible hybrid ceramic (FHC), (2) resin nanoceramic (RNC), (c) polymer infiltrated ceramic network (PICN) and (4) feldspar ceramic (FC). All groups were further divided into four subgroups according to surface treatment: control, hydrofluoric acid etching (HF), air-borne particle abrasion with aluminum oxide (AlO), and tribochemical silica coating (TSC). After surface treatments, silane was applied to half of the specimens. Then, a silane-containing universal adhesive was applied, and specimens were repaired with a composite, Next, μSBS test was performed. Additional specimens were examined with a contact profilometer and scanning electron microscopy. The data were analyzed with ANOVA and Tukey tests.RESULTS: The findings revealed that silane application yielded higher µSBS values (P<.05). All surface treatments were showed a significant increase in µSBS values compared to the control (P<.05). For FHC and RNC, the most influential treatments were AlO and TSC (P<.05).CONCLUSION: Surface treatment is mandatory when the silane is not preferred, but the best bond strength values were obtained with the combination of surface treatment and silane application. HF provides improved bond strength when the ceramic content of material increases, whereas AlO and TSC gives improved bond strength when the composite content of material increases.


Subject(s)
Adhesives , Aluminum Oxide , Ceramics , Clinical Protocols , Dental Bonding , Dental Restoration Repair , Hydrofluoric Acid , Microscopy, Electron, Scanning , Polymers , Shear Strength , Silicon Dioxide
18.
Chinese Journal of Stomatology ; (12): 373-377, 2020.
Article in Chinese | WPRIM | ID: wpr-827013

ABSTRACT

The minimal tooth reduction, esthetic appeal and biocompatibility of porcelain laminate veneers have made them one of the mainstream technologies for minimal invasive esthetic dental restorations. Cementation is a crucial step in ensuring retention, marginal seal and influencing the clinical longevity of veneer restorations. Experts from Society of Prosthodontics, Chinese Stomatological Association formulated operational specifications for the cementation of porcelain laminate veneers, so as to standardize the clinical operating procedures, achieve the long-term success of veneer restorations, and promote the application of porcelain laminate veneers.


Subject(s)
Cementation , Dental Porcelain , Dental Veneers , Esthetics, Dental
19.
Chinese Journal of Stomatology ; (12): 461-465, 2020.
Article in Chinese | WPRIM | ID: wpr-827012

ABSTRACT

Fiber-reinforced resin composite posts (fiber posts) are used extensively for the restoration of root-treated teeth with excessive loss of coronal structure. However, the longevity of a fiber post restoration still needs to be improved because of the various confounding factors that affect bonding procedures. Operational specification for clinical use of dental intraradicular fiber post was established based on the in-depth discussions by a panel of experts from Society of Prosthodontics, Chinese Stomatological Association. This specification should be helpful in standardizing the clinical technique of fiber post placement and improving the clinical longevity of a fiber post restoration.


Subject(s)
Cementation , Composite Resins , Dental Bonding , Dental Stress Analysis , Glass , Materials Testing , Post and Core Technique , Resin Cements , Tooth Root
20.
ROBRAC ; 28(87): 260-265, out./dez. 2019. ilus
Article in Portuguese | LILACS-Express | LILACS | ID: biblio-1096274

ABSTRACT

Objetivo: Este trabalho tem como objetivo apresentar um caso clínico de reabilitação estética anterior (centrais e laterais anterossuperiores) associando facetas e coroas cerâmicas cimentadas com diferentes técnicas (cimento resinoso e resina composta aquecida) com a finalidade de reproduzir as características dos dentes naturais. Material e Métodos: Paciente A.M.A., gênero feminino, 47 anos, compareceu à clínica odontológica da Faculdade de Odontologia da Universidade Federal de Goiás (UFG), relatando insatisfação com a estética do seu sorriso, diferenças no formato e cor de seus dentes. Ao exame clínico intrabucal verificou-se uma coroa total provisória do dente 22, e o mau posicionamento do dente 12 em relação aos adjacentes. Foi indicada cirurgia periodontal para aumento de coroa clínica, clareamento dental, duas facetas cerâmicas nos incisivos centrais e duas coroas cerâmicas nos incisivos laterais superiores. Após a cirurgia periodontal e clareamento, foi realizado o refinamento dos preparos para coroa total e preparos para faceta cerâmica. O material de escolha para as restaurações foi o dissilicato de lítio devido sua grande capacidade de mimetizar o dente natural. As coroas foram cimentadas com isolamento relativo do campo operatório e cimento resinoso dual. As facetas foram cimentadas com isolamento absoluto e resina composta aquecida. Resultados: Após 15 dias da cimentação a paciente retornou à clínica onde se observou saúde periodontal e perfeita adaptação das restaurações indiretas. Conclusão: Obteve-se excelente resultado estético associando diferentes tipos de restaurações e técnicas de cimentação adesiva e a paciente se mostrou confortável com as diferentes abordagens e satisfeita com o resultado estético do tratamento.


Objective: This study aims to present a clinical case of anterior aesthetic rehabilitation (central and anterior superior sides), combining cemented ceramic veneers and crowns with different techniques (resin cement and heated composite resin) with the use of chemical substances as used substances. Material and Methods: Patient A.M.A., female, 47 years old, compared to the dental clinic of the Faculty of Dentistry of the Federal University of Goiás (UFG), relating dissatisfaction with the aesthetics of his smile, differences in the shape and color of his patients. On intraoral clinical examination, a provisional total crown of tooth 22 was found, and tooth 12 was poorly positioned in relation to adjacent teeth. Periodontal surgery was indicated to increase the clinical crown, tooth whitening, two ceramic veneers on the central incisors and two ceramic crowns on the upper lateral incisors. After periodontal surgery and whitening, the preparations for the full crown and preparations for the ceramic veneer were refined. The material of choice for restorations was dissolved on the site due to its great ability to mimic the natural tooth. As crowns, they were cemented with isolation relative to the operative field and double resin cement. The veneers were cemented with absolute insulation and heated composite resin. Results: After 15 days of cementation, the patient returned to the clinic where he recovered from periodontal health and perfect adaptation of the indirect restorations. Conclusion: You get an excellent aesthetic result by associating different types of restorations and adhesive cementation techniques and a patient is comfortable with different approaches and satisfaction with the aesthetic result of the treatment.

SELECTION OF CITATIONS
SEARCH DETAIL