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1.
Rev. flum. odontol ; 3(59): 49-56, set.-dez. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1380687

ABSTRACT

O "planejamento reverso" em implantodontia busca alcançar um melhor prognóstico para a reabilitação do paciente, permitindo uma maior previsibilidade para o tratamento a partir do momento em que se planeja a reabilitação oral protética antes mesmo de planejar os implantes osseointegráveis. O dispositivo de resina acrílica chamado guia multifuncional representa a disposição final dos dentes na reabilitação e auxilia demasiadamente na etapa protética em casos em que não é possível a carga imediata. Ainda, otimiza o número de consultas do tratamento pois orienta a relação maxilomandibular, dimensão vertical e correta posição dos dentes. O presente trabalho tem como objetivo apresentar um caso clínico da utilização do guia multifuncional para moldagem dos implantes em caso de protocolo Branemark com dois tempos cirúrgicos, mostrando sua utilidade para diminuição do número de consultas na etapa de confecção da prótese total inferior definitiva. Diante dos resultados obtidos na realização do caso, foi possível concluir que nos casos de protocolo Branemark quando não é possível realizar a carga imediata, o guia multifuncional pode ser aproveitado e utilizado com sucesso, para a moldagem e confecção da prótese definitiva, diminuindo o número de consultas e otimizando o tratamento.


Reverse planning in implantology aims to improve patient's rehabilitation prognosis allowing greater treatment predictability from the prosthetic planning and before the implants installation. The acrylic resin device called multifunctional guide represents the final teeth disposition and is very useful in the prosthetic step when immediate loading is not possible. And it optimizes appointments treatment number since it guides the maxillomandibular relation, vertical dimension and correct teeth position. The aim of this study was to present a clinical case using the multifunctional guide for implant molding a two steps Branemark protocol, showing its usefulness to reduce the appointments number during the inferior total denture preparation step. Based on these results, it was possible to conclude that in Branemark protocol, when it immediate loading is not possible, the multifunctional guide can be used successfully for molding and making the final prosthesis, reducing the number of visits and optimizing treatment.


Subject(s)
Humans , Male , Middle Aged , Acrylic Resins , Clinical Protocols , Denture, Complete, Lower , Mouth Rehabilitation
2.
Rev. Odontol. Araçatuba (Impr.) ; 43(1): 62-68, jan.-abr. 2022. ilus
Article in English | LILACS, BBO | ID: biblio-1361724

ABSTRACT

Próteses totais imediatas e overdentures mandibulares em carga imediata, são boas alternativas para restaurar a função e a estética. Além disso, proporcionam um fator psicológico positivo, eliminando as consequências emocionais e sociais da perda dos dentes. O objetivo deste estudo foi relatar um caso clínico, com cinco anos de acompanhamento, utilizando parâmetros clínicos e ferramentas qualitativas, para analisar o impacto na qualidade de vida do paciente e no sucesso do tratamento. Este caso clínico foi desenvolvido em um projeto assistencial da Faculdade de Odontologia da Universidade Federal de Minas Gerais, Brasil, que promove a reabilitação oral de pacientes de baixa renda com dentes severamente comprometidos. Paciente do sexo masculino, 57 anos, apresentou-se para tratamento com condição severa de saúde dental e periodontal. O plano de tratamento proposto foi a extração dos dentes remanescentes e confecção de prótese total imediata maxilar e overdenture mandibular, em carga imediata, sobre implantes. O paciente foi acompanhado periodicamente, a cada seis meses, para substituição do o´rings, conforme recomendação do fabricante. Após 5 anos, as próteses foram reembasadas com resina acrílica termopolimerizável e os componentes protéticos da overdenture foram substituídos. Em um acompanhamento qualitativo, a equipe utilizou uma entrevista narrativa, com foco nos impactos do tratamento na qualidade de vida desse paciente. Ele confirmou, em um relato em primeira pessoa, sua satisfação com o tratamento realizado e a melhora nas relações sociais, afetivas e no trabalho, mostrando como a reconquista do sorriso pode transformar a experiência pessoal do indivíduo(AU)


Immediate complete dentures and mandibular immediately loaded overdentures are good alternatives to restore function and aesthetics. Moreover, they provide positive psychological factor, eliminating the emotional and social consequences of tooth loss. The aim of this study was to report a clinical case, with five years of follow-up using clinical parameters and qualitative tools, to analyze the impact on quality of life and the success of treatment. This clinical case was developed in an assistance project of the Dental School of Federal University of Minas Gerais in Brazil, which promotes oral rehabilitation of low-income patients with severely damaged dentitions. A 57-yearold male patient presented for treatment with a severe dental and periodontal health condition. The proposed treatment plan was extraction of the remaining teeth and making maxillary immediate complete denture and mandibular immediately loaded implant-supported overdenture. The patient was monitored periodically, every six months, to replace the polymer ring ball attachment, according to the manufacturer's recommendation. After 5 years, the prostheses were relining with heat-polymerized acrylic resin and overdenture prosthetic components were replaced. In a qualitative follow-up, the team used a narrative interview, focusing on the impacts of treatment in the quality of life of this patient. He confirms, in a firstperson account, his satisfaction with the treatment performed and improvements in social and affective relations and in the work, showing how the reconquest of the smile can transform the personal experience of the individual(AU)


Subject(s)
Humans , Male , Middle Aged , Dental Care , Denture, Complete, Immediate , Immediate Dental Implant Loading , Quality of Life , Acrylic Resins , Oral Health , Denture, Overlay
3.
Braz. dent. sci ; 25(3): 1-9, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1373077

ABSTRACT

Objective: Thermally activated acrylic resins (RAATs) are widely used in dentures as a base material due to their good dimensional stability and biocompatibility. However, their low thermal conductivity is a disadvantage, as it affects acceptance when using dental prostheses. Thus, the objective of this work was to measure the conduction heat in RAATs with and without incorporation of silica and silver nanoparticles (NP) and rigid reline (RR). Material and Methods: For this, samples were made and divided into 10 groups (n = 6). The first five groups were 2-mm-thick samples: G1 (RAAT control), G2 (RAAT + RR control), G3 (RAAT and NP + RR), G4 (RAAT + RR and NP), and G5 (RAAT and RR modified by NP). In the other five groups, 8-mm-thick samples were made: G6 (RAAT control), G7 (RAAT + RR control), G8 (RAAT and NP + RR), G9 (RAAT + RR and NP), and G10 (RAAT and RR modified by NP). The heat that cross the surface of the specimens was quantified using a wireless device. The data were submitted to two-factor ANOVA statistical analysis and Tukey ́s test with a 5% significance level. Results: After measuring the temperature variation as a function of time, it can be observed that there was a statistically significant difference for thermal conduction between the control groups and those modified with NP. Conclusion: Thus, it was possible to conclude that the NP improved the heat conduction in RAAT and in the RR because the nanoparticles have a higher thermal conductivity. (AU)


Objetivo: As resinas acrílicas termicamente ativadas (RAATs) são amplamente utilizada em próteses dentárias como material de base, pois possuem uma boa estabilidade dimensional e biocompatibilidade. Porém, como desvantagem, possuem baixa condutividade térmica, o que prejudica a aceitação do uso de próteses dentárias. Assim, o objetivo deste trabalho foi medir a condução de calor em RAAT com e sem incorporação de nanopartículas de sílica e prata (NP) e reembasador rígido (RR). Material e Métodos: Para isso, foram confeccionadas amostras que foram divididas em 10 grupos (n=6). Os primeiros cinco grupos eram amostras de 2 mm de espessura: G1 (RAAT controle), G2 (RAAT + RR controle), G3 (RAAT e NP + RR), G4 (RAAT + RR e NP) e G5 (RAAT e RR modificados por NP). E nos outros cinco grupos foram feitas amostras com espessura de 8 mm: G6 (RAAT controle), G7 (RAAT + RR controle), G8 (RAAT e NP + RR), G9 (RAAT + RR e NP) e G10 (RAAT e RR modificados por NP). O calor percorrido pela superfície dos corpos ­ de prova foi quantificado por meio de um dispositivo sem fio. Os dados foram submetidos à análise estatística ANOVA dois fatores e teste de Tukey com 5% de significância. Resultados: Após medir a variação da temperatura em função do tempo, pode-se observar que houve diferença estatisticamente significante para a condução térmica entre os grupos controle e os modificados com NP. Conclusão: Assim, foi possível concluir que a NP melhorou a condução de calor na RAAT e no RR, pois as nanopartículas apresentam maior condutividade térmica. (AU)


Subject(s)
Thermal Conductivity , Acrylic Resins , Nanoparticles , Metal Nanoparticles
4.
Rev. Fac. Odontol. (B.Aires) ; 37(85): 41-48, 2022. ilus, tab, graf
Article in Spanish | LILACS | ID: biblio-1402386

ABSTRACT

El objetivo del presente estudio fue evaluar la lectura e interpretación de códigos QR grabados con láser, sobre soportes metálicos adaptados, en prótesis den-tales acrílicas sometidas a injurias térmicas y ácidas. Se confeccionaron 150 prótesis de acrílico termopo-limerizable: 120 prótesis fueron expuestas a la acción de temperaturas de 200ºC, 400ºC, 800ºC y 1000ºC durante 30, 60 y 120 minutos (Grupo 1). Este grupo se dividió en un subgrupo 1.A, que incluyó 60 prótesis con el código QR grabado sobre un soporte de cromo cobalto adaptado en el acrílico, y un subgrupo 1.B, con 60 aparatos protésicos que portaban en su estruc-tura un soporte de acero para bandas de ortodoncia con el código QR. Las 30 prótesis remanentes confor-maron el Grupo 2 y se dividieron en subgrupo 2.A (15 prótesis con el soporte de cromo cobalto), y subgrupo 2.B (15 prótesis con el soporte de acero para bandas de ortodoncia), todas sumergidas en ácido clorhídrico al 40 % a temperatura ambiente, durante 30, 60 y 120 minutos. Los análisis estadísticos para comparación entre grupos e inter-grupos fueron ANOVA y prueba de Tukey, todos con nivel de significancia p<0,05. En el Grupo 1, la lectura positiva de los códigos QR fue del 75 % para el subgrupo 1.A, y 12 % en el subgrupo 1.B. Para el Grupo 2, la lectura positiva de los códigos QR resultó en un 66 % en el subgrupo 2.A, y 0 % para el subgrupo 2.B. Se concluyó que pese a los efectos vulnerantes de los agentes físicos y químicos sobre el acrílico, bajo ciertas condiciones es posible leer e interpretar códigos QR grabados con láser sobre so-portes metálicos adaptados en la estructura protéti-ca, representando una alternativa para la identificación humana (AU)


The objective was to evaluate the reading and interpretation of laser-engraved QR codes on metal supports adapted to acrylic dental prostheses subjected to thermal and acid insults. Were made 150 thermo-curing acrylic prostheses, 120 prostheses were exposed to the action of temperatures of 200ºC, 400ºC, 800ºC and 1000ºC for 30, 60 and 120 minutes (Group 1). This group was divided into a subgroup 1.A that included 60 prostheses with the QR code engraved on a cobalt chromium support adapted to the acrylic and a subgroup 1.B with the other half of the prosthetic appliances, which had in their structure a support of steel for orthodontic bands with QR code. The 30 remaining prostheses made up Group 2 and were divided into subgroup 2.A (15 prostheses with cobalt chromium support) and subgroup 2.B (15 prostheses with steel support for orthodontic bands) all submerged in hydrochloric acid 40% at room temperature, for 30, 60 and 120 minutes. The statistical analyzes for groups comparison and between groups were ANOVA and Tukey's test, all with a significance level of p <0.05. In Group 1, the positive reading of the QR codes was 75% for Subgroup 1.A and 12% in subgroup 1.B. For Group 2, the positive reading of the QR codes resulted in 66% in subgroup 2.A and 0% for subgroup 2.B. Conclusion: Despite the damaging effects of physical and chemical agents on acrylic, under certain conditions it is possible to read and interpret laser-engraved QR codes on metal supports adapted to the prosthetic structure, which may represent an alternative for human identification (AU)


Subject(s)
Algorithms , Forensic Anthropology , Denture Identification Marking , Lasers , Acrylic Resins , Analysis of Variance , Data Interpretation, Statistical , Computer Security , Dental Prosthesis , Hydrochloric Acid
5.
Article in Chinese | WPRIM | ID: wpr-936133

ABSTRACT

OBJECTIVE@#To compare the operation complexity and accuracy of traditional splint impression technique and impression technique with prefabricated rigid connecting bar system for full-arch implants-supported fixed protheses in vitro.@*METHODS@#Standard mandibular edentulous model with six implant analogs was prepared. The implants were placed at the bone level and multiunit abutments screwed into the implants. Two impression techniques were performed: the traditional splint impression technique was used in the control group, and the rigid connecting bar system was used in the test group. In the control group, impression copings were screwed into the multiunit abutments and connected with autopolymerizing acrylic resin. Open tray impression was fabricated with custom tray and polyether. In the test group, cylinders were screwed into the multiunit abutments. Prefabricated rigid bars with suitable length were selected and connected to the cylinders with small amount of autopolymerizing acrylic resin, and open tray impression was obtained. Impression procedures were repeated 6 times in each group. The working time of the two impression methods were recorded and compared. Analogs were screws into the impressions and gypsum casts were poured. The gypsum casts and the standard model were transferred to stereolithography (STL) files with model scanner. Comparative analysis of the STL files of the gypsum casts and the standard model was carried out and the root mean square (RMS) error value of the gypsum casts of the control and test groups compared with the standard model was recorded. The trueness of the two impression techniques was compared.@*RESULTS@#The work time in the test group was significantly lower than that in the control group and the difference was statistically significant [(984.5±63.3) s vs. (1 478.3±156.2) s, P < 0.05]. Compared with the standard model, the RMS error value of the implant abutments in the test group was (16.9±5.5) μm. The RMS value in the control group was (20.2±8.0) μm. The difference between the two groups was not significant (P>0.05).@*CONCLUSION@#The prefabricated rigid connecting bar can save the chair-side work time in implants immediate loading of edentulous jaw and simplify the impression process. The impression accuracy is not significantly different from the traditional impression technology. The impression technique with prefabricated rigid connecting bar system is worthy of clinical application.


Subject(s)
Acrylic Resins , Calcium Sulfate , Dental Implants , Dental Impression Materials , Dental Impression Technique , Humans , Jaw, Edentulous , Models, Dental , Mouth, Edentulous
6.
São José dos Campos; s.n; 2022. 78 p. tab, ilus, graf.
Thesis in Portuguese | LILACS, BBO | ID: biblio-1397436

ABSTRACT

Este estudo, desenvolvido em duas etapas, avaliou a ação remineralizadora da biopartícula α-wollastonita (BP), a partir da reação com H3PO4 residual Si-O-Ca + H3PO4 → SiO2 + Ca5(PO4)3(OH)n + H2O, na resistência longitudinal de união e características da interface adesiva, quando aplicada na forma de suspensão (etanol 99,5% + 10% de BP em peso) na superfície dentinária previamente condicionada com H3PO4 37%. Na primeira etapa foi realizado um estudo piloto onde, pelas características de precipitação, foi identificada a melhor concentração de biopartículas a serem inseridas na formulação da suspensão. Na segunda etapa, duzentas coroas hígidas de incisivos bovinos foram embutidas em resina acrílica, polidas para padronizar a smear layer e divididas aleatoriamente em 2 grupos (n=100), segundo a estratégia adesiva: A - controle (H3PO4 + Single Bond™ Universal (SB)); WAS ­ (H3PO4 + BP em suspensão + SB). Blocos de resina composta (Filtek Z250; 3M/ESPE) de 4mm foram confeccionados por técnica incremental sobre as áreas tratadas em todos os grupos, utilizando uma matriz de silicona. As amostras foram então seccionadas para obtenção de palitos retangulares (aproximadamente 1mm2 ), armazenadas em água deionizada a 4ºC em recipientes individuais e divididas em 2 subgrupos (n=50) de acordo com o tempo de armazenamento de 24 h (imediato) e 12 meses (longitudinal), seguidos do teste de resistência adesiva à microtração (10 kgf, 0,5mm/min). Os dados foram submetidos ao teste ANOVA 2 fatores (p< 0,05) e teste de Weibull 2 parâmetros. As interfaces adesivas foram analisadas por microscopia eletrônica de varredura (MEV) para avaliar a morfologia da interface resina-dentina, e analisadas por espectroscopia FTIR, para compreensão das interações químicas formadas na superfície dentinária. Os Resultados evidenciaram maiores valores estatisticamente significativos de resistência de união (MPa) para o grupo WAS (37,39 ± 7,48), tratado com BP e armazenado por 24 h, em comparação ao grupo A armazenado por 24 h (27,58 ± 6,43); e, para o grupo WAS armazenado por 12 meses (32,05 ± 10,64) em comparação ao grupo A armazenado por 12 meses (22,84 ± 5,76). Dados do FTIR evidenciaram o efeito da α-wollastonita na preservação do colágeno. A biopartícula mostrou ser promissora na manutenção longitudinal da qualidade da interface adesiva. (AU)


This study, developed in two stages, evaluated the remineralizing action of the αwollastonite (BP) bioparticle, from the reaction with residual Si-O-Ca + H3PO4 → SiO2 + Ca5(PO4)3(OH)n + H2O, on the longitudinal bond strength and characteristics of the adhesive interface, when applied as a suspension (99.5% ethanol + 10% BP by weight) on the dentin surface previously etched with 37% H3PO4. In the first stage, a pilot study was carried out where, due to the precipitation characteristics, the best concentration of bioparticles to be inserted in the suspension formulation was identified. In the second step, two hundred sound bovine incisor crowns were embedded in acrylic resin, polished to standardize the smear layer and randomly divided into 2 groups (n=100), according to the adhesive strategy: A - control (H3PO4 + Single Bond™ Universal (SB)); WAS ­ (H3PO4 + BP in suspension + SB). Composite resin blocks (Filtek Z250; 3M/ESPE) of 4 mm were made by incremental technique on the treated areas in all groups, using a silicone matrix. The samples were then sectioned to obtain rectangular sticks (approximately 1mm2 ), stored in deionized water at 4ºC in individual containers and divided into 2 subgroups (n=50) according to the storage time of 24 h (immediate) and 12 months (longitudinal), followed by the microtensile bond strength test (10 kgf, 0.5 mm/min). Data were submitted to 2-way ANOVA (p<0.05) and 2-parameter Weibull test. The adhesive interfaces were analyzed by scanning electron microscopy (SEM) to evaluate the morphology of the resin-dentin interface, and analyzed by FTIR spectroscopy, to understand the chemical interactions formed on the dentin surface. The results showed higher statistically significant values of bond strength (MPa) for the WAS group (37.39 ± 7.48), treated with BP and stored for 24 h, compared to group A stored for 24 h (27, 58 ± 6.43); and for the WAS group stored for 12 months (32.05 ± 10.64) compared to group A stored for 12 months (22.84 ± 5.76). FTIR data evidenced the effect of α-wollastonite on collagen preservation. The bioparticle showed promise in the longitudinal maintenance of the quality of the adhesive interface (AU)


Subject(s)
Animals , Cattle , Acrylic Resins , Analysis of Variance , Composite Resins , Dental Cements , In Vitro Techniques , Microscopy, Electron, Scanning , Collagen
7.
Braz. dent. sci ; 25(4): 1-7, 2022. tab
Article in English | LILACS, BBO | ID: biblio-1397461

ABSTRACT

Objective: The rough surfaces of removable appliances used in pediatric dentistry or orthodontics, may result in an environment for biofilm accumulation, yielding to enamel demineralization. This study aimed to assess the effects of adding nanoparticles of bioactive glass to polymethylmethacrylate to promote the antibacterial activity in acrylic resins. Material and Methods: Acrylic resin specimens (20x20x1mm3) were prepared by adding 2% or 5% bioactive glass. The specimens in the control group without bioactive glass were prepared from the mixture of acrylic powder containing nanoparticles and liquid monomer (n=10 per group). The antibacterial activity of the specimens against Streptococcus mutans and Lactobacillus acidophilus activity in biofilm was investigated through counting colony forming units (CFU). Data were analyzed using a one-way analysis of variance and Tukey's post hoc tests at the significance level of 0.05. Results: The incorporation of 2% (p=0.001) and 5% (p<0.001) bioactive glass in acrylic resin reduced the metabolic activity and CFU of L. acidophilus. For S.mutans, antimicrobial activity was observed only with the 5% concentration of bioactive glass, and this group was statistically different from the control (p<0.001). When L. acidophilus was exposed to polymethyl methacrylate with 5% bioactive glass, significant decrease was observed compared to the control group (p<0.05). Conclusion: Adding bioactive glass nanoparticles into the acrylic resins used for fabricating removable appliances revealed a greater antibacterial effect against cariogenic bacteria tested (AU)


Objetivo: As superfícies rugosas dos aparelhos removíveis utilizados em Odontopediatria ou Ortodontia, podem resultar em um ambiente para acúmulo de biofilme, cedendo à desmineralização do esmalte. Este estudo teve como objetivo avaliar os efeitos da adição de nanopartículas de vidro bioativo ao polimetilmetacrilato para promover a atividade antibacteriana em resinas acrílicas. Material e Métodos: Amostras de resina acrílica (20x20x1 mm3) foram preparadas pela adição de 2% ou 5% de vidro bioativo. Os corpos de prova do grupo controle sem vidro bioativo foram preparados a partir da mistura de pó acrílico contendo nanopartículas e monômero líquido (n=10 por grupo). A atividade antibacteriana dos espécimes sobre a atividade de Streptococcus mutans e Lactobacillus acidophilus em biofilme foi investigada através da contagem de unidades formadoras de colônias (UFC). Os dados foram analisados por meio de análise de variância unidirecional e testes post hoc de Tukey com nível de significância de 0,05. Resultados: A incorporação de 2% (p=0,001) e 5% (p<0,001) de vidro bioativo em resina acrílica reduziu a atividade metabólica e UFC de L. acidophilus. Para S. mutans, a atividade antimicrobiana foi observada apenas com a concentração de 5% de vidro bioativo, sendo este grupo estatisticamente diferente do controle (p<0,001). Quando L. acidophilus foi exposto ao polimetilmetacrilato com 5% de vidro bioativo, foi observada diminuição significativa em relação ao grupo controle (p<0,05). Conclusão: A adição de nanopartículas de vidro bioativo nas resinas acrílicas utilizadas na fabricação de aparelhos removíveis revelou um maior efeito antibacteriano contra as bactérias cariogênicas testadas(AU)


Subject(s)
Acrylic Resins , Dental Materials , Dentists , Anti-Bacterial Agents
8.
Cambios rev. méd ; 20(2): 46-52, 30 Diciembre 2021. ilus, tabs.
Article in Spanish | LILACS | ID: biblio-1368285

ABSTRACT

INTRODUCCIÓN. Los cambios de color en los dientes acrílicos dependen de varios factores, con el humo de cigarrillo como uno de los principales agentes de igmentación de las prótesis. OBJETIVO. Valorar el grado de pigmentación en dientes acrílicos sometidos al humo del cigarrillo, mediante espectrofotometría digital. MATERIALES Y MÉTODOS. Estudio observacional, analítico, de caso y control. Muestra de 60 dientes acrílicos divididos en dos grupos: A (resina acrílica de 3 capas) y B (resina acrílica de 4 capas). Se subdividió en: grupo 1: dientes sometidos a humo de cigarrillo estándar con filtro de carbón; grupo 2: dientes sometidos a humo de cigarrillo estándar sin filtro; y, grupo 3: grupo control. Cada uno de éstos se expuso a 150 cigarrillos, 5 diarios durante 30 días y el grupo control fue mantenido a 37ºC en saliva artificial durante 30 días sin aplicación de humo de cigarrillo. Para la toma de color se empleó espectrofotómetro Vita Easyshade®. Los análisis se realizaron en el programa estadístico International Business Machines Statistical Package for the Social Sciences mediante la prueba de Kruskal-Wallis y comparaciones de Dunn. RESULTADOS. Se determinó que la pigmentación del grupo B fue mayor a la del grupo A, con una diferencia significativa entre ellos (p< 0,05). No se encontró datos estadísticamente significativos entre cigarrillos (con filtro - sin filtro). CONCLUSIÓN. La exposición al humo de cigarrillo pigmentó los dientes acrílicos de ambas propiedades siendo mayor en los dientes de resina acrílica de 4 capas.


INTRODUCTION. Color changes in acrylic teeth depend on several factors, with cigarette smoke as one of the main agents of denture pigmentation. OBJECTIVE. To assess the degree of pigmentation in acrylic teeth subjected to cigarette smoke, using digital spectrophotometry. MATERIALS AND METHODS. Observational, analytical, case-control study. Sample of 60 acrylic teeth divided into two groups: A (3-layer acrylic resin) and B (4-layer acrylic resin). It was subdivided into: group 1: teeth subjected to standard cigarette smoke with charcoal filter; group 2: teeth subjected to standard cigarette smoke without filter; and, group 3: control group. Each of these was exposed to 150 cigarettes, 5 daily for 30 days and the control group was maintained at 37ºC in artificial saliva for 30 days without application of cigarette smoke. Vita Easyshade® spectrophotometer was used for color determination. The analyses were performed in the statistical program International Business Machines Statistical Package for the Social Sciences using the Kruskal-Wallis test and Dunn's comparisons. RESULTS. It was determined that the pigmentation of group B was greater than that of group A, with a significant difference between them (p< 0,05). No statistically significant data was found between cigarettes (filtered - unfiltered). CONCLUSION. Cigarette smoke exposure pigmented acrylic teeth of both properties being higher in 4-layer acrylic resin teeth.


Subject(s)
Humans , Saliva, Artificial , Pigmentation , Jaw, Edentulous , Dental Prosthesis , Color Perception , Cigarette Smoking , Students, Dental , Tobacco Smoke Pollution , Tooth Diseases , Acrylic Resins , In Vitro Techniques , Dentistry , Tooth Wear
9.
Rev. Ciênc. Méd. Biol. (Impr.) ; 20(3): 485-490, dez 20, 2021. fig
Article in Portuguese | LILACS | ID: biblio-1354357

ABSTRACT

Introdução: os dentes artificiais de resina acrílica são amplamente utilizados na confecção de próteses, por apresentarem propriedades físicas, mecânicas e biológicas, além de características de fácil manuseio. No entanto, devido sua característica de baixa resistência à abrasão, a escovação pode levar à perda de massa dos dentes artificiais e aumento da rugosidade. Objetivo: avaliar de forma qualitativa a rugosidade superficial e polimento de dentes artificiais das marcas Hereaus Premium; Trilux e Vita, após período de 1 ano de escovação, com fotografias em Lupa Estereoscópica. Metodologia: para a realização deste estudo, serão utilizados 10 dentes artificiais de cada marca comercial (Trilux, Vita e Hereaus Premium). Os dentes serão fixados com resina ortoftálica em tubo de PVC de 15 mm de espessura. Para o teste de abrasão, será usada uma máquina de escovação simulada com escovas de dentes de cerdas macias e solução de pasta de dente. As imagens serão obtidas com câmera digital acoplada a lupa estereoscópica. A rugosidade superficial e o polimento serão analisados antes da escovação simulada e após 12 meses de escovação através das imagens. Resultados: após o teste de abrasão foi observado a presença de um desgaste superficial e/ou ranhuras na superfície dos dentes artificiais em todos os grupos. Porém não houve um padrão similar entre os corpos de prova de um mesmo grupo. Conclusão: Pode-se concluir que a escovação provocou o aumento da rugosidade superficial e alteração no polimento em todos os dentes artificiais utilizados.


Introduction: acrylic resin artificial teeth are widely used in the manufacture of dentures, as they have physical, mechanical and biological properties, in addition to easy handling characteristics. However, due to its characteristic of low abrasion resistance, brushing can lead to loss of mass of artificial teeth and increase in roughness. Objective: qualitatively evaluate the surface roughness and polishing of artificial teeth of Hereaus Premium brands; Trilux and Vita, after a 1-year brushing period, with photographs using a Stereoscopic Magnifying Glass. Methodology: for this study, 10 artificial teeth of each commercial brand will be used (Trilux, Vita and Hereaus Premium). Teeth will be fixed with orthophthalic resin in a 15 mm thick PVC tube. For the abrasion test, a simulated brushing machine with soft bristle toothbrushes and toothpaste solution will be used. Images will be obtained with a digital camera coupled to a stereoscopic magnifying glass. Surface roughness and polishing will be analyzed before simulated brushing and after 12 months of brushing through the images. Results: after the abrasion test, the presence of surface wear and/ or grooves on the surface of the artificial teeth was observed in all groups. However, there was no similar pattern between the specimens of the same group. Conclusion: it can be concluded that brushing caused an increase in surface roughness and change in polishing in all artificial teeth used.


Subject(s)
Humans , Tooth Abrasion , Tooth, Artificial , Acrylic Resins , Toothbrushing , Review
10.
Odovtos (En línea) ; 23(2)ago. 2021.
Article in English | LILACS-Express | LILACS, SaludCR | ID: biblio-1386539

ABSTRACT

ABSTRACT: The purpose of this study was to evaluate and compare the effect of carbonated beverage on the surface microhardness of two acrylic materials used to fabricate temporary restorations. The study was experimental in vitro. Forty blocks of acrylic resins used in provisional restorations were made, 20 from Alike® (GC AMERICA INC., Lot 1712161) and 20 from Acryptemp® (Zhermack S.P.A., Lot 302334). After that, the blocks were immersed in distilled water for 24 hours. After this time, the initial surface microhardness was measured. Then the 20 samples of the experimental group were immersed in a carbonated drink (coca cola - soda) for 12 minutes per day, for 5 days. Finally, the final surface microhardness was measured using the Vickers microdurometer. Measures of central tendency and dispersion were used, and the Student's t test and ANOVA were performed. A mean surface microhardness of 8.8 and 7.2HV was found for the PMMA resin group (Initial and final respectively), and 9.5 and 8HV for the bisacrylate group. Statistically significant differences were found when comparing the beginning and end of each group and when comparing the two materials. The acrylic resin of polymethylmethacrylate (Alike® GC AMERICA INC.) Presented higher surface microhardness compared to the bis acrylic resin (Acrytemp® Zhermack S.P.A), after being exposed to a carbonated drink.


RESUMEN: El propósito de este estudio fue evaluar y comparar el efecto de la bebida carbonatada en la microdureza superficial de dos materiales acrílicos utilizados para confeccionar restauraciones provisionales. El estudio fue experimental in vitro. Se confeccionaron 40 bloques de resinas acrílicas utilizadas en provisorios, 20 de Alike® (GC AMERICA INC., Lote 1712161) y 20 de Acryptemp® (Zhermack S.P.A., Lote 302334). Posterior a ello, se sumergió los bloques en agua destilada por 24 horas. Pasado este tiempo se procedió a medir la microdureza superficial inicial. Luego las 20 muestras del grupo experimental se sumergieron en una bebida carbonatada (coca cola-gaseosa) durante 12 minutos por día, durante 5 días. Por último se midió la microdureza superficial final mediante el microdurómetro de Vickers. Se utilizaron medidas de tendencia central, dispersión y se realizaron la prueba t de Student y ANOVA. Se encontró una microdureza superficial media de 8,8 y 7,2HV para el grupo de resina PMMA (Inicial y final respectivamente), y 9,5 y 8HV para el grupo de bisacrilato. Se halló diferencias estadísticamente significativas al comparar el inicio y final de cada grupo y al comparar los dos materiales. La resina acrílica de polimetilmetacrilato (Alike® GC AMERICA INC.) presentó mayor microdureza superficial en comparación con la resina bis acrílica (Acrytemp® Zhermack S.P.A), después de ser expuestas a una bebida carbonatada.


Subject(s)
Acrylic Resins/analysis , Carbonated Beverages/adverse effects , Peru , Hardness
11.
Rev. cient. odontol ; 9(2): e054, abr.-jun. 2021. ilus, tab, graf
Article in Spanish | LILACS, LIPECS | ID: biblio-1254593

ABSTRACT

Objetivo: Comparar la microdureza superficial de discos de acrílico de autocurado y termocurado en distintos periodos de tiempo. Metodología: Este estudio experimental, un ensayo en laboratorio in vitro, incluyó 80 discos de acrílico (Vitalloy), 40 de autocurado (A) y 40 de termocurado (T) divididos en 8 subgrupos: grupo control de autocurado GA0 (n = 10), grupo control de termocurado GT0 (n = 10), grupo de autocurado almancenado 1 día GA1 (n = 10), grupo de termocurado almacenado 1 día GT1 (n = 10), grupo de autocurado almacenado 7 días GA7 (n = 10), grupo de termocurado almacenado 7 días GT7 (n = 10), grupo de autocurado almacenado 21 días GA21 (n = 10), grupo de termocurado almacenado 21 días GT21 (n = 10); luego se evaluó la microdureza superficial Vickers de los discos de resina acrílica previamente almacenados en suero fisiológico en los distintos periodos de tiempo. Posteriormente, los datos fueron analizados estadísticamente mediante test de Anova y Tukey. El nivel de significancia estadística se tomó como p < 0,05. Resultados: Los valores encontrados fueron en el GT0 (20,45 ± 0,93 VHN); GA0(16,25 ± 0,79 VHN); GT1 (20,08 ± 0,66 VHN); GA1 (15,97 ± 0,78 VHN); GT7 (19,57 ± 1,54 VHN); GA7 (14,33 ± 0,48 VHN); GT21 (19,17 ± 1,26 VHN); GA21 (14,64 ± 0,52 VHN), presentando diferencias estadísticamente significativas ambos grupos autocurado y termocurado (p < 0,001). Conclusión: Los grupos de resinas acrílicas de termocurado presentaron mejores valores de microdureza que los grupos de resinas acrílicas de autocurado en los distintos periodos de tiempo evaluados. (AU)


Objective: To compare surface microhardness of self-curing and heat-curing acrylic discs in different periods of time. Methodology: This in vitro laboratory study, consisted of 80 acrylic discs (Vitalloy), 40 self-cured (A) and 40 heat-cured (T) divided into 8 subgroups: self-cure control group GA0 (n=10), heat-cure control group GT0 (n=10), self-cure group stored 1 day GA1 (n=10), heat-cure group stored 1 day GT1 (n=10), self-cure group stored 7 days GA7 (n=10), heat-cure group stored 7 days GT7 (n=10), self-cure group stored 21 days GA21 (n=10), and heat-cure group stored 21 days GT21 (n=10). Vickers surface microhardness of the acrylic resin discs previously stored in physiological serum was then evaluated at the different time periods. Subsequently, the data was statistically analyzed using ANOVA and TUKEY tests. The level of statistical significance was set at P <0.05. Results: The values found were in GT0 (20.45±0.93 Vickers hardness number [VHN]); GA0 (16.25±0.79 VHN); GT1 (20.08±0.66 VHN); GA1 (15.97±0.78 VHN); GT7(19.57±1.54 VHN); GA7 (14.33±0.48 VHN); GT21 (19.17±1.26 VHN); GA21 (14.64±0.52 VHN), with statistically significant differences between the self-cure and heat-cure groups (P<0.001). Conclusion: The groups of heat-curing acrylic resins presented better microhardness values than the groups of self-curing acrylic resins in the different time periods evaluated. (AU)


Subject(s)
Acrylic Resins , Hardness , In Vitro Techniques , Intervention Studies
12.
Rev. cuba. estomatol ; 58(2): e3309, 2021. tab, graf
Article in Spanish | LILACS, CUMED | ID: biblio-1289401

ABSTRACT

Introducción: Las prótesis provisionales son restauraciones usadas en prótesis fijas durante un tiempo, hasta la cementación de la prótesis definitiva. Uno de los problemas que presentan este tipo de restauraciones es el cambio de color, que afecta a la estética y, en consecuencia, produce sensación de desagrado en los pacientes. Objetivo: Evaluar, para restauraciones provisionales, con y sin el pulido final de la superficie, la estabilidad del color de dos resinas al ser sumergidas en café. Métodos: Estudio experimental in vitro, realizado en el Laboratorio de Prótesis de la Facultad de Odontología de la Universidad Nacional del Nordeste, Corrientes-Argentina, 2019. Se comparó una resina acrílica (Duralay®) con una bisacrílica (ProtempIV 3M®) para restauraciones provisionales. Se elaboraron 40 discos de resinas a partir de moldes metálicos de 25 mm de diámetro y 2 mm de espesor. Se utilizaron 20 discos para cada tipo de resina, de ellos, 10 pulidos y 10 sin pulir. Las muestras fueron almacenadas en agua destilada en estufa a 37 °C durante 24 h para hidratarlos. Luego se procedió a la toma del color. Con posterioridad, cada grupo se sumergió en café, manteniéndolos en estufa a 37 °C durante 24 h más. Seguidamente, se realizó la segunda toma del color. Se utilizó el colorímetro Kónica Minolta®, determinando la diferencia total de color ΔE. Para el análisis estadístico se utilizó ANOVA una vía y test de Tukey para identificar la diferencia entre grupos. Resultados: Se observó en el grupo de resina acrílica pulida una diferencia ΔE = 0,82 ± DS = 0,22 y de ΔE = 3,86 ± DS = 0,30 sin pulido. En el grupo de resina bisacrílica pulido se obtuvo ΔE = 4,84 ± DS = 0,25 y, para el no pulido, ΔE = 5,85 ± DS = 0,29. Conclusiones: Se comprobaron diferencias significativas en la estabilidad del color de ambas resinas. La resina bisacrílica fue la menos estable, independientemente del pulido(AU)


Introduction: Provisional prosthesis are restorations used in fixed prostheses for a while, until the definitive prosthesis is cemented. One of the problems posed by this type of restoration is the change in color, which affects esthetics and therefore creates a feeling of displeasure in patients. Objective: Evaluate, in the case of provisional restorations with and without final surface polish, the color stability of two resins when soaked in coffee. Methods: An in vitro experimental study was conducted in the Prosthesis Laboratory at the Dental School of the National University of the Northeast in Corrientes, Argentina, in the year 2019. A comparison was made of an acrylic resin (Duralay®) versus a bisacrylic resin (ProtempIV 3M®) for provisional restorations. Forty resin disks were made from metal molds 2 mm thick and 25 mm in diameter. Twenty disks were used for each type of resin, of which 10 were polished and 10 were not. The samples were stored in distilled water in a stove at 37ºC for 24 h to hydrate them. Color measurements were then taken. Next, each group was soaked in coffee and kept in the stove at 37ºC for another 24 h. A second color measurement was then taken. A Konica Minolta® colorimeter was used to determine total color difference ΔE. Statistical analysis was based on one-way ANOVA and Tukey's test was used to identify the difference between the groups. Results: In the polished acrylic resin group a difference was found of ΔE = 0.82 ± SD = 0.22, whereas in the non-polish group the difference was ΔE = 3.86 ± SD = 0.30. In the polished bisacrylic resin group the difference was ΔE = 4.84 ± SD = 0.25, whereas in the non-polish group the difference was ΔE = 5.85 ± SD = 0.29. Conclusions: Significant differences were found in the color stability of both resins. The bisacrylic resin was the least stable, regardless of polish(AU)


Subject(s)
Humans , Prostheses and Implants , Acrylic Resins/adverse effects , Cementation/methods , Dental Polishing/methods , Prosthesis Coloring/methods , Esthetics, Dental
13.
Rev. Fac. Odontol. Univ. Antioq ; 33(1): 122-132, Jan.-June 2021. graf
Article in English | LILACS | ID: biblio-1340748

ABSTRACT

Abstract Amelogenesis imperfecta (AI) refers to a group of rare genetic disorders that involve tooth development and are passed down through families. Hypoplasic AI phenotypes include the absence of enamel as a result of a defect in the secretory stage. This case report describes the diagnosis and treatment of a patient with hypoplastic AI. The clinical implications include sensitive teeth, functional problems, and aesthetic complaining. The diagnosis was done through history, clinical examination and imaging. The intervention was performed by Direct Resin Veneers. This treatment showed to improve occlusion, esthetics, and self-image of the teenager. The satisfactory clinical result has made it possible to avoid more invasive and expensive treatments.


RESUMEN La amelogénesis imperfecta (AI) se refiere a un grupo de trastornos genéticos raros que involucran el desarrollo de los dientes y se transmiten de padres a hijos. Los fenotipos de AI hipoplásicos incluyen la ausencia de esmalte como resultado de un defecto en la etapa secretora. Este reporte de caso clínico describe el diagnóstico y tratamiento de un paciente con AI tipo hipoplásica. Las implicaciones clínicas incluyen dientes sensibles, problemas funcionales y quejas estéticas. El diagnóstico se realizó mediante anamnesis, exploración clínica e imagenología. La intervención fue realizada con carillas directas de resina. Este tratamiento demostró mejoras en la oclusión, la estética y la autoimagen del adolescente. El resultado clínico satisfactorio permitió evitar tratamientos más invasivos y costosos.


Subject(s)
Amelogenesis Imperfecta , Acrylic Resins , Dental Veneers
14.
São Paulo; s.n; 20210219. 78 p.
Thesis in Portuguese | LILACS, BBO | ID: biblio-1147715

ABSTRACT

A resina acrílica é usada em larga escala nos mais diversos setores inclusive na odontologia. Apesar dessa difusão, esse material sofre um problema sério frente a adesão de microrganismos em sua superfície. Visando isso, o presente trabalho elaborou um biomaterial baseado na incorporação do biocida Poli (cloreto de dialildimetilamônio) (PDADMAC) na massa de resinas acrílicas auto e termopolimerizável, avaliou suas propriedades antifúngicas e citotoxicidade. O PDADMAC foi incorporado nas resinas acrílicas e sua atividade antifúngica foi testada frente aos fungos Candida albicans (ATCC 10231) e Aspergillus niger (ATCC 16404) seguindo os protocolos padrão G21-15 e E2149-13. Além disso, cepas isoladas da mucosa oral de pacientes sem doenças sistêmicas foram identificadas e a partir disso foram realizados os estudos de protease e de potencial antifúngico frente a essas cepas. Foram realizados também os testes de citotoxidade utilizando o ensaio de redução de MTT em células-tronco de polpa dentária cultivadas em contato com meio de cultura condicionado pelas resinas. Os resultados demostraram que ambas as resinas com PDADMAC exibiram eficácia significativa contra Candida albicans. Já com relação ao fungo Aspergillus niger, ficou evidente que esse material possui apenas eficácia fungistática. Com relação às cepas isoladas da mucosa oral de pacientes sem doenças sistêmicas, foi observado que a Candida albicans foi a mais prevalente e que independente da produção de protease produzidas por essas cepas as resinas acrescidas de PDADMAC são eficazes. Nos exames de citotoxidade a adição do biocida nas resinas não afetou a viabilidade celular quando comparada às células cultivadas em condições ideais. Portanto, conclui-se que a incorporação de PDADMAC nas resinas acrílicas foi determinante para alcançar o efeito antifúngico desejado, mantendo a biocompatibilidade. Este estudo encontrou resultados promissores para o uso futuro deste biocida em materiais odontológicos.


Subject(s)
Acrylic Resins , Dental Materials , Antifungal Agents
15.
Article in Chinese | WPRIM | ID: wpr-879449

ABSTRACT

In the process of repairing of bone defects, bone scaffold materials need to be implanted to restore the corresponding tissue structure at the injury. At present, the repair materials used for bone defects mainly include autogenous bone, allogeneic bone, metal materials, bioceramics, polymer materials and various composite materials. Different materials have demonstrated strong reconstruction ability in bone repair, but the ideal bone implants in the clinic are still yet to be established. Except for autogenous bone, other materials used in bone defect repair are unable to perfectly balance biocompatibility, bone formation, bone conduction and osteoinduction. Combining the latest advances in materials sciences and clinical application, we believe that composite materials supplementedwith Chinese medicine, tissue cells, cytokines, trace elements, etc. and manufactured using advanced technologies such as additive manufacturing technology may have ideal bone repair performance, and may have profound significance in clinical repair of bone defects of special type. This article reviewed to the domestic and foreign literature in recent years, and elaborates the current status of bone defect repair materials in clinical application and basic research in regard to the advantages, clinical options, shortcomings, and how to improve the autogenous bone, allogeneic bone and artificial bone materials, in order to provide a theoretical basis for clinical management of bone defects.


Subject(s)
Acrylic Resins , Biocompatible Materials , Bone Substitutes , Bone and Bones , Osteogenesis , Tissue Engineering , Tissue Scaffolds
16.
J. appl. oral sci ; 29: e20210024, 2021. tab, graf
Article in English | LILACS | ID: biblio-1340097

ABSTRACT

Abstract Understanding the behavior of Candida spp. when exposed to denture disinfectants is essential to optimize their effectiveness. Changes in the virulence factors may cause increased resistance of Candida spp. to disinfectant agents. Objective To evaluate the microbial load, cellular metabolism, hydrolytic enzyme production, hyphae formation, live cell and biofilm quantification of Candida albicans, Candida tropicalis and Candida glabrata after exposure to disinfectant solutions. Methodology Simple biofilms were grown on heat-polymerized acrylic resin specimens, and divided into groups according to solutions/strains: distilled water (control); 0.25% sodium hypochlorite (NaOCl 0.25% ); 10% Ricinus communis (RC 10%); and 0.5% Chloramine T (CT 0.5%). The virulence factors were evaluated using the CFU count (microbial load), XTT method (cell metabolism), epifluorescence microscopy (biofilm removal and live or dead cells adhered), protease and phospholipase production and hyphae formation. Data were analyzed (α=0.05) by one-way ANOVA/ Tukey post hoc test, Kruskal-Wallis test and Wilcoxon test. Results NaOCl 0.25% was the most effective solution. CT 0.5% reduced the number of CFUs more than RC 10% and the control. RC 10% was effective only against C. glabrata. RC 10% and CT 0.5% decreased the cellular metabolism of C. albicans and C. glabrata. Enzyme production was not affected. Hyphal growth in the RC 10% and CT 0.5% groups was similar to that of the control. CT 0.5% was better than RC 10% against C. albicans and C. tropicalis when measuring the total amount of biofilm and number of living cells. For C. glabrata, CT 0.5% was equal to RC 10% in the maintenance of living cells; RC 10% was superior for biofilm removal. Conclusions The CT 0.5% achieved better results than those of Ricinus communis at 10%, favoring the creation of specific products for dentures. Adjustments in the formulations of RC 10% are necessary due to efficacy against C. glabrata. The NaOCl 0.25% is the most effective and could be suitable for use as a positive control.


Subject(s)
Candida , Disinfectants , Acrylic Resins , Candida albicans , Biofilms , Virulence Factors
17.
J. appl. oral sci ; 29: e20200948, 2021. tab, graf
Article in English | LILACS | ID: biblio-1340105

ABSTRACT

Abstract Appropriated denture hygiene is a predictive factor for longevity of rehabilitation treatment and maintenance of the oral mucosal health. Although, disinfectant solutions are commonly used as denture cleansers, the impact of these solutions on acrylic resin-based dentures remain unclear. Objective To evaluate, in vitro, the antibiofilm activity of complete denture hygiene solutions and their effects on physical and mechanical properties of acrylic resin. Methodology For antibiofilm activity measurement acrylic resin specimens were contaminated with Candida albicans, Candida glabrata and Streptococcus mutans. After biofilm growth, the specimens were assigned to the hygiene solutions: Distilled water (Control); 0.2% Sodium hypochlorite (SH); Efferdent Power Clean Crystals (EPC) and 6.25% Ricinus communis (RC). The viability of microorganisms was evaluated by agar plate counts. In parallel, physical, and mechanical properties of the acrylic resin were evaluated after simulating a 5-year period of daily immersion in the previously mentioned solutions. The changes in surface roughness, color, microhardness, flexural strength, impact strength, sorption and solubility were evaluated. Data were compared by ANOVA followed by the Tukey test or Kruskal-Wallis followed by the Dunn test depending on the distribution (α=0.05). Results Regarding antibiofilm action, SH eliminated all microorganisms while EPC and RC exhibited moderate action against S. mutans (p=0.001) and C. glabrata (p<0.001), respectively. Relative to effects on the physical and mechanical properties of the acrylic resin, RC led to higher values of color change (p=0.030), hardness (p<0.001), surface roughness (p=0.006) and flexural strength (p<0.001). Moreover, RC induced the highest values of changes in solubility (p<0.001). EPC promoted greater changes in surface morphology, whereas immersion in SH retained the initial appearance of the acrylic resin surface. All hygiene solutions reduced the impact strength (p<0.05). Conclusion SH presented the most effective antibiofilm activity. In addition, changes on properties were observed after immersion in RC, which were considered within acceptable limits.


Subject(s)
Acrylic Resins , Denture Cleansers/pharmacology , Surface Properties , Materials Testing , Hygiene , Biofilms , Denture Bases , Denture, Complete
18.
J. appl. oral sci ; 29: e20200865, 2021. graf
Article in English | LILACS | ID: biblio-1286916

ABSTRACT

Abstract Denture stomatitis is the most frequent oral lesion in removable prosthesis wearers, with high recurrence rates and a complex treatment. Objective This study describes a protocol to obtain and to contaminate a palatal device with Candida albicans biofilm that could be used for an animal model of denture stomatitis. Methodology Acrylic resin devices (N=41) were obtained from impressions of the palates of Wistar rats with individual trays and polyether. The efficacy of microwave irradiation (MW), ultraviolet light (UV), or ultrasonic bath (US) was assessed by colony viability and spectrophotometric analyses (n=5) in order to select the most appropriate method for sterilizing the devices. Then, different devices (n=5) were contaminated with C. albicans and evaluated by CFU/mL determination, scanning electron microscopy, and laser confocal microscopy. Device stabilization was assessed with either autopolymerizing acrylic resins or a self-adhesive resin cement (n=2). The spectrophotometric data were analyzed by one-way ANOVA followed by the Tukey's HSD post-hoc test (α=0.05). Results MW was the only method capable of sterilizing the devices, and the contamination protocol developed a mature and viable C. albicans biofilm (~1.2 x 106 CFU/mL). The self-adhesive resin cement was the best stabilization material. Conclusions This acrylic resin palatal device was designed to be similar to the clinical situation of contaminated prostheses, with easy manufacturing and handling, effective stabilization, and satisfactory contamination. Thus, the acrylic device can be a valuable tool in the development of denture stomatitis in rats.


Subject(s)
Animals , Rats , Stomatitis, Denture , Candida albicans , Palate , Acrylic Resins , Rats, Wistar , Biofilms , Denture Bases
19.
Dental press j. orthod. (Impr.) ; 25(6): 43-48, Nov.-Dec. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1154053

ABSTRACT

ABSTRACT Objective: To evaluate different concentrations of Galla chinensis extract (GCE) added to poly(methyl methacrylate) (PMMA), which is widely used for fabrication of removable orthodontic appliances, regarding the effectiveness of this herbal extract on antimicrobial effect and flexural strength of PMMA. Methods: Acrylic resin samples containing 0.4%, 0.8% and 1.6% GCE were prepared. Flexural strength was investigated via three-point flexural strength test for the 15 acrylic resin blocks of each concentration. Disk diffusion test was used to evaluate antibacterial effects of incorporating the same concentrations of GCE into acrylic resin. All these three groups were compared with the control group, with no added GCE, regarding flexural strength and antibacterial properties. Results: Comparison of flexural strength between the three study groups and the control group showed significant differences between the groups (P=0.018). However, there was no significant difference between the groups containing GCE. There were significant differences in antimicrobial activity between the four groups (P=0.026). Conclusion: Within the limitations of this study, it is suggested that incorporation of GCE into PMMA would be beneficial for antimicrobial activity and flexural strength of PMMA, but further studies on other physical properties and antimicrobial effects on other bacterial strain would be beneficial prior to clinical investigations.


RESUMO Objetivo: Avaliar se diferentes concentrações de extrato de Galla chinensis (EGC) adicionado ao polimetilmetacrilato (PMMA), que é amplamente utilizado para a fabricação de aparelhos ortodônticos removíveis, interferem no efeito antimicrobiano desse extrato e na resistência à flexão do PMMA. Métodos: Foram preparadas amostras de resina acrílica com concentrações de 0,4%, 0,8% e 1,6% de EGC. Para a avaliação da resistência à flexão, utilizou-se o teste de flexão em três pontos para as 15 amostras de resina em cada concentração. O teste de disco-difusão foi utilizado para avaliar os efeitos antibacterianos da incorporação das mesmas concentrações de EGC na resina acrílica. Esses três grupos foram comparados ao grupo controle, sem adição do EGC, em relação à resistência à flexão e quanto às propriedades antimicrobianas. Resultados: As comparações dos três grupos com o grupo controle mostraram diferenças significativas (p=0,018) para a resistência à flexão. Entretanto, não houve diferença significativa entre os grupos contendo EGC. Foram encontradas diferenças significativas na atividade antimicrobiana entre os quatro grupos (p=0,026). Conclusão: Dentro das limitações desse estudo, parece que a incorporação de EGC no PMMA seria benéfica para a atividade antimicrobiana e a resistência à flexão do PMMA. Porém, estudos adicionais sobre outras propriedades físicas e sobre os efeitos antimicrobianos contra diferentes cepas de bactérias seriam interessantes antes de se fazer pesquisas clínicas.


Subject(s)
Acrylic Resins , Denture Bases , Flexural Strength , Anti-Infective Agents , Anti-Bacterial Agents/pharmacology , Materials Testing , Plant Extracts/pharmacology
20.
Braz. dent. j ; 31(5): 511-515, Sept.-Oct. 2020. tab
Article in English | LILACS, BBO | ID: biblio-1132334

ABSTRACT

Abstract This study aimed to assess the physicochemical properties of a repair material in the Brazilian market, BioMTA, in comparison to other two materials currently in use (Biodentine and MTA Angelus). The initial setting time was evaluated using Gillmore needle. The pH was measured with a pH-meter after 24 h, 3, 7, 14 and 21 days. The radiopacity was determined using the equivalence in millimeters of aluminum (mm Al) from digitized occlusal radiographs. Solubility was determined after immersion in water for 7 days. The data were analyzed by one-way ANOVA and Tukey tests (a=0.05). The BioMTA initial setting time (5.2 min) was lower than the other materials (p<0.05). All materials showed an alkaline pH at 21 days. At 24 h, BioMTA was the most alkaline material (p<0.05); and at 3, 7, 14 and 21 days there was no difference between BioMTA and Biodentine (p>0.05), both being more alkaline than MTA Angelus (p<0.05). The radiopacity of BioMTA (4.2 mm Al) was significantly higher compared to Biodentine (p<0.05) and lower than MTA Angelus (p<0.05). The solubility of the materials was -4.2%, -1.6% and 4.1% for BioMTA, MTA Angelus and Biodentine, respectively, with a significant difference between them (p<0.05). Therefore, it can be concluded that BioMTA displayed a shorter setting time, an alkaline pH, a higher radiopacity, and a gain in mass.


Resumo Este estudo teve como objetivo avaliar as propriedades físico-químicas de um material reparador disponível no mercado brasileiro, BioMTA, em comparação com outros dois materiais atualmente em uso (Biodentine e MTA Angelus). O tempo de presa inicial foi avaliado usando a agulha de Gillmore. O pH foi medido com um pH-metro após 24 h, 3, 7, 14 e 21 dias. A radiopacidade foi determinada aplicando a equivalência em milímetros de alumínio (mm Al) de radiografias oclusais digitalizadas. A solubilidade foi determinada após imersão em água por 7 dias. Os dados foram analisados ​​por meio dos testes ANOVA de uma via e Tukey (a=0,05). O tempo de presa inicial do BioMTA (5,2 min) foi menor do que os outros materiais (p<0,05). Todos os materiais apresentaram pH alcalino aos 21 dias. Às 24 h, o BioMTA foi o material mais alcalino (p<0,05); e aos 3, 7, 14 e 21 dias não houve diferença entre BioMTA e Biodentine (p>0,05), sendo ambos mais alcalinos que MTA Angelus (p<0,05). A radiopacidade do BioMTA (4,2 mm Al) foi significativamente maior em comparação ao Biodentine (p<0,05) e menor que o MTA Angelus (p<0,05). A solubilidade dos materiais foi de -4,2%, -1,6% e 4,1% para BioMTA, MTA Angelus e Biodentine, respectivamente, havendo diferença significativa entre eles (p<0,05). Portanto, pode-se concluir que o BioMTA apresentou um menor tempo de presa, pH alcalino, uma alta radiopacidade e um ganho em massa.


Subject(s)
Root Canal Filling Materials , Silicates , Oxides , Solubility , Acrylic Resins , Materials Testing , Brazil , Water , Calcium Compounds , Aluminum Compounds , Drug Combinations
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