Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 12 de 12
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Braz. j. oral sci ; 20: e219342, jan.-dez. 2021. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1253927

RESUMO

Aim: The aim of this study was to compare the microtensile bond strength (µTBS) and the characteristics of the adhesive interface of Scotchbond Universal - SU ­ etch-and-rise mode (3M ESPE) and Adper Scotchbond Multi-Purpose - MP (3M ESPE) to dentin over time. Methods: Class I cavity preparations were performed in 60 human molars that were randomly divided according to the dentin bonding system (DBS) used (n=30): (1) Acid conditioning + SU and (2) Acid conditioning + MP. For bonding strength (BS) analysis, 30 teeth (n = 15) were sectioned into sticks and submitted to the microtensile test in a universal testing machine after 24 hours and 12 months. The adhesive interface of the others 30 teeth was analyzed in a confocal microscope after 24 hours and 12 months. The data of µTBS were analyzed by two-way repeated measures ANOVA and Tukey's HSD (α = 0.05). Results: SU presented the lowest DBS compared to MP (p=0.000). Time did not influenced DBS for both adhesive systems (p=0.177). Confocal microscopy analysis showed no cracks between both adhesive systems tested. Conclusion: The results indicate that MP - µTBS showed a better performance compared to SU in total-etch mode


Assuntos
Humanos , Adesivos Dentinários , Microscopia Confocal , Dentina , Metacrilatos
2.
J Appl Oral Sci ; 29: e20200865, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33886943

RESUMO

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.


Assuntos
Candida albicans , Estomatite sob Prótese , Resinas Acrílicas , Animais , Biofilmes , Bases de Dentadura , Palato , Ratos , Ratos Wistar
3.
J Appl Oral Sci ; 28: e20200639, 2021 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-33656098

RESUMO

OBJECTIVE: To evaluate the surface morphology and in vitro leachability of temporary soft linings modified by the incorporation of antifungals in minimum inhibitory concentrations (MIC) for Candida albicans biofilm. METHODOLOGY: Specimens of soft lining materials Softone and Trusoft were made without (control) or with the addition of nystatin (Ny), miconazole (Mc), ketoconazole (Ke), chlorhexidine diacetate (Chx), or itraconazole (It) at their MIC for C. albicans biofilm. The surface analyses were performed using Confocal laser scanning microscopy after 24 h, 7 days, or 14 days of immersion in distilled water at 37ºC. In vitro leachability of Chx or Ny from the modified materials was also measured using Ultraviolet visible spectroscopy for up to 14 days of immersion in distilled water at 37ºC. Data (µg/mL) were submitted to ANOVA 1-factor/Bonferroni (α=0.05). RESULTS: Softone had a more irregular surface than Trusoft. Morphological changes were noted in both materials with increasing immersion time, particularly, in those containing drugs. Groups containing Chx and It presented extremely porous and irregular surfaces. Both materials had biexponential release kinetics. Softone leached a higher concentration of the antifungals than Trusoft (p=0.004), and chlorhexidine was released at a higher concentration than nystatin (p<0.001). CONCLUSIONS: The surface of the soft lining materials changed more significantly with the addition of Chx or It. Softone released a higher concentration of drugs than Trusoft did, guiding the future treatment of denture stomatitis.


Assuntos
Reembasadores de Dentadura , Estomatite sob Prótese , Antifúngicos , Candida albicans , Humanos , Cetoconazol , Teste de Materiais , Nistatina , Estomatite sob Prótese/tratamento farmacológico , Propriedades de Superfície
4.
J. appl. oral sci ; 29: e20200865, 2021. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1286916

RESUMO

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.

5.
J Indian Prosthodont Soc ; 20(3): 278-284, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33223697

RESUMO

The aim was to discuss the indications, contraindications, advantages, and disadvantages of Nonmetal clasp dentures (NMCDs), as well as the most relevant properties of its constituent materials. A search was conducted using the keywords: "nonmetal clasp dentures," "thermoplastic resin," "flexible resin removable partial denture," "polyamide," and "nylon" in databases PubMed/Medline, Lilacs, SciELO, and textbooks between 1955 and 2020. Theses and texts without reliable sources of publication were excluded. Once the analysis instruments were determined, the data were analyzed and discussed. NMCDs present high flexibility, easy adaptation to the abutments, color compatibility and biocompatibility with the oral mucosa, and absence of visible metal clasps. However, they need laboratory relining, grinding, and polishing, do not have criteria for its planning, become rougher and stained over time, and are able to traumatize supporting tissues. The association with metal components seems to be an alternative to increase the success of NMCDs by combining esthetics and biomechanical principles of conventional removable partial dentures. The lack of long-term clinical studies makes the professionals to rely solely on previous experiences or on the manufacturers' recommendations. It suggested that NMCDs must be indicated with caution when not used temporarily.

6.
J Fungi (Basel) ; 6(2)2020 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-32456172

RESUMO

Considering the high prevalence and recurrence of Candida-associated denture stomatitis (CADS), in vivo studies in animal models are necessary before those in humans to evaluate new therapeutic strategies. This study aimed to review the literature on murine models of CADS induction using acrylic intraoral devices simulating dentures. Rats are recommended as experimental animals in these models as well as the adoption of a pasty diet. For maintenance in the proper position during the experiments, intraoral appliances must be obtained by individual impressions, using and retained exclusively by cementation on the molars. The region of interest for histopathological analysis was standardized as that corresponding to the area between the first molars. However, there is no consensus among the studies on the CADS induction rat models in relation to the Candida albicans inoculation and need for immunosuppression and/or administration of antibacterial drugs of animals. The greatest difficulty of the available models refers to maintaining the course of the lesion for a sufficient period to evaluate the effectiveness of the proposed treatment, considering the rapid and efficient murine immune response to candidal colonization. Therefore, future studies are necessary for the development of a robust and reproducible CADS model.

7.
Rev. Odontol. Araçatuba (Impr.) ; 40(2): 15-21, maio/ago. 2019.
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1006531

RESUMO

O objetivo deste estudo foi discutir, por meio de uma revisão de literatura, as indicações, contraindicações, vantagens, desvantagens das alternativas reabilitadoras mais comuns utilizando PPRs e o impacto desses tratamentos na qualidade de vida relacionada à saúde bucal dos pacientes. Foi realizada uma pesquisa ampla na literatura, com a utilização dos termos "Prótese Parcial Removível", "Qualidade de Vida", "Saúde bucal"; "Satisfação do Paciente", no período entre 1990 e 2018, no Medline, Google Scholar, internet e livros didáticos. Foi demonstrado que a reabilitação com PPRs associadas a implantes resultou em melhor qualidade de vida associada à saúde bucal dos usuários, seguida por PPRs retidas por encaixe e PPRs convencionais. Entretanto, o profissional deve considerar as condições sistêmicas, bucais e econômicas de cada paciente, tendo o conhecimento biomecânico bem como a ciência dos benefícios e das desvantagens de cada tipo de tratamento para estabelecer um correto diagnóstico do caso e, assim, indicar o melhor tipo de PPR. Dessa forma, é possível oferecer o melhor tratamento para cada paciente parcialmente edêntulo, devolvendo estética e função de maneira satisfatória de modo a resultar em maior nível de satisfação e qualidade de vida(AU)


The purpose of this study was to discuss, through a review of the literature, indications, contraindications, advantages, disadvantages of the most common rehabilitation alternatives using RPDs and the impact of these treatments on patients' oral health quality of life. A broad research was conducted in the literature, using the terms "Partial Removable Prosthesis", "Quality of Life", "Oral Health"; "Patient Satisfaction" in the period between 1990 and 2018, in Medline, Google Scholar, internet and textbooks. It was demonstrated that rehabilitation with RPDs associated with implants resulted in a better oral health quality of life of users, followed by RPDs with attachments and conventional RPDs. However, the professional should consider the systemic, oral and economic conditions of each patient, based on the biomechanical knowledge, as well as the science of the benefits and disadvantages of each type of treatment to establish a correct diagnosis of the case, and thus, indicate the best type of RPD. In this way, it is possible to offer the best treatment for each partially edentulous patient, returning aesthetics and function in a satisfactory manner in order to result in a higher level of satisfaction and quality of life(AU)


Assuntos
Qualidade de Vida , Prótese Parcial Removível , Implantes Dentários , Saúde Bucal , Satisfação do Paciente
8.
J Prosthet Dent ; 121(2): 311-316, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30037694

RESUMO

STATEMENT OF PROBLEM: Specifications for determining acceptable limits of water sorption (WS) and solubility for interim denture resilient liners are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the WS and solubility of interim resilient materials throughout their lifespans. MATERIAL AND METHODS: Specimens (n=10) of 7 tissue conditioners, Coe-Comfort (CC), Softone (ST), Rite-Line (RL), Dura Conditioner (DC), Hydrocast (HC), Dentusoft (DS), and Visco-gel (VG) and 2 interim resilient liners, Trusoft (TS) and Coe-Soft (CS), were submitted to desorption until weight stabilization. Next, they were immersed in distilled water at 37°C for 3, 5, 7, or 14 days and then weighed, dried, and reweighed. Data (%) were analyzed using 2-way ANOVA and the Tukey honestly significant difference (HSD) test (α=.05). RESULTS: VG demonstrated the highest WS (12.06 ±0.93%-16.62 ±0.87%) and solubility (20.30 ±4.26%-23.59 ±2.24%; P<.05) percentages. Low WS values were presented by CC (2.23 ±0.53%-2.99 ±0.49%; P<.05). The WS showed no significant changes for CC, CS, and TS over 14 days (P>.05). SL presented intermediate solubility values (4.09 ±1.60%-8.80 ±1.15%), and the other materials showed values lower than 3.35 ±0.70%. CC, DC, DS, HC, RL, TS, and CS showed no changes in solubility throughout the 14-day trial. CONCLUSIONS: Over the lifespan of a tissue conditioner (7 days), CC, RL, DC, HC, DS, CS, and TS presented suitable in vitro performance. Among the tested materials, CC, CS, and TS were considered best suited for denture relining for up to 14 days.


Assuntos
Reembasadores de Dentadura , Água/química , Absorção Fisico-Química , Técnicas In Vitro , Teste de Materiais , Solubilidade , Propriedades de Superfície
9.
J Appl Oral Sci ; 26: e20170383, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29742260

RESUMO

The proper selection of polymerization cycle is important to prevent overheating of the monomer that could cause degradation, porosity and, consequently, deleterious effects on the denture base properties. Objective This study evaluated the porosity, water sorption and solubility of acrylic resins (Vipi Cril-VC and Vipi Wave-VW) after conventional or microwave polymerization cycles. Material and Methods Specimens (n = 10) were made and cured: 1-WB = 65°C during 90 min + boiling during 90 min (VC cycle - control group); 2-M25 = 10 min at 270 W + 5 min at 0 W + 10 min at 360 W (VW cycle); 3-M3 = 3 min at 550 W; and 4-M5 = 5 min at 650 W. Afterward, they were polished and dried in a dessicator until a constant mass was reached. Specimens were then immersed in distilled water at 37°C and weighed regularly until a constant mass was achieved. For porosity, an additional weight was made with the specimen immediately immersed in distilled water. For water sorption and solubility, the specimens were dried again until equilibrium was reached. Data were submitted to 2 way-ANOVA and Tukey HSD (α=0.05). Results Porosity mean values below 1.52% with no significant difference among groups for both materials were observed. Resins showed water sorption and solubility values without a significant difference. However, there was a significant difference among groups for these both properties (P<0.013). The highest sorption (2.43%) and solubility (0.13%) values were obtained for WB and M3, respectively. Conclusions The conventional acrylic resin could be polymerized in a microwave since both the materials showed similar performance in the evaluated properties. Shorter microwave cycles could be used for both the materials without any detectable increase in volume porosity.


Assuntos
Resinas Acrílicas/química , Bases de Dentadura , Polimerização , Água/química , Análise de Variância , Teste de Materiais , Micro-Ondas , Porosidade , Reprodutibilidade dos Testes , Solubilidade , Fatores de Tempo
10.
J. appl. oral sci ; 26: e20170383, 2018. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-893710

RESUMO

Abstract The proper selection of polymerization cycle is important to prevent overheating of the monomer that could cause degradation, porosity and, consequently, deleterious effects on the denture base properties. Objective This study evaluated the porosity, water sorption and solubility of acrylic resins (Vipi Cril-VC and Vipi Wave-VW) after conventional or microwave polymerization cycles. Material and Methods Specimens (n = 10) were made and cured: 1-WB = 65°C during 90 min + boiling during 90 min (VC cycle - control group); 2-M25 = 10 min at 270 W + 5 min at 0 W + 10 min at 360 W (VW cycle); 3-M3 = 3 min at 550 W; and 4-M5 = 5 min at 650 W. Afterward, they were polished and dried in a dessicator until a constant mass was reached. Specimens were then immersed in distilled water at 37°C and weighed regularly until a constant mass was achieved. For porosity, an additional weight was made with the specimen immediately immersed in distilled water. For water sorption and solubility, the specimens were dried again until equilibrium was reached. Data were submitted to 2 way-ANOVA and Tukey HSD (α=0.05). Results Porosity mean values below 1.52% with no significant difference among groups for both materials were observed. Resins showed water sorption and solubility values without a significant difference. However, there was a significant difference among groups for these both properties (P<0.013). The highest sorption (2.43%) and solubility (0.13%) values were obtained for WB and M3, respectively. Conclusions The conventional acrylic resin could be polymerized in a microwave since both the materials showed similar performance in the evaluated properties. Shorter microwave cycles could be used for both the materials without any detectable increase in volume porosity.

11.
Rev. odontol. UNESP (Online) ; 46(5): 261-266, Sept.-Oct. 2017. tab, graf
Artigo em Português | LILACS-Express | LILACS | ID: biblio-902676

RESUMO

Resumo Introdução Os dentes acrílicos artificiais devem apresentar característica de resistência aos ácidos, a fim de assegurar a manutenção de suas propriedades, ao longo de sua vida útil. Entretanto, não há estudos disponíveis na literatura pertinente sobre as propriedades superficiais de dureza e rugosidade das diferentes camadas de resina acrílica que compõem os dentes artificiais submetidos a ensaios de erosão simulada. Objetivo Avaliar a dureza e rugosidade superficiais das camadas externa e interna de dentes artificiais acrílicos reforçados submetidos a desafio ácido. Metodologia Molares (SR Postaris e Trilux) seccionados transversalmente foram avaliados inicialmente quanto à dureza Vickers e rugosidade. Esses ensaios foram repetidos após metade das amostras de cada tipo de dente (n=10) ser imersa em água destilada (controle) e outra metade em vinagre durante 15 min/dia por 28 dias. Os resultados foram analisados por ANOVA 2-critérios e teste de Tukey (α=0,05). Resultado A dureza inicial da camada externa dos dois diferentes tipos de dente não sofreu alteração significativa pelo desafio ácido (p>0,05) e a imersão em vinagre não causou efeito deletério à dureza inicial da camada interna dos dois tipos de dentes avaliados (p>0,05). Após 28 dias, a rugosidade inicial de ambos os tipos de dentes estudados, para as duas camadas, não foi alterada com água ou vinagre (p>0,05). Conclusão Os dentes acrílicos reforçados foram resistentes ao desafio ácido uma vez que suas camadas interna e externa não apresentaram alteração significativa de dureza e rugosidade superficiais.


Abstract Introduction Artificial acrylic teeth must be resistant to acids for ensure the maintenance of their properties throughout their useful life. However, there are no studies available in the literature about the surface properties of hardness and roughness of the different layers of acrylic resin that make up the artificial teeth submitted to simulated erosion tests. Objective To evaluate the surface hardness and roughness of external and internal layers of artificial cross-linked acrylic teeth submitted to acid challenge. Methodology First molars (SR Postaris and Trilux) transversely sectioned had its Vickers hardness and roughness initially evaluated. These tests were repeated after half of the tooth samples (n=10) be immersed into distilled water (control) and half in vinegar during 15 min/day for 28 days. Data were analyzed using 2-way ANOVA and Tukey's test (α=0.05). Result The initial external layers hardness of both was not significantly altered by acid challenge (p> 0.05) and the immersion in vinegar caused no deleterious effect on the initial internal layers hardness of the two tested teeth (p>0.05). After 28 days, the initial roughness of both teeth evaluated for the two layers was not affected by water or vinegar (p>0.05). Conclusion The reinforced acrylic teeth were resistant to acid challenge since its internal and external layers showed no significant change in hardness and surface roughness.

12.
Full dent. sci ; 8(29): 56-60, 2016. tab
Artigo em Português | BBO - Odontologia | ID: biblio-909349

RESUMO

O aumento considerável de pesquisas na literatura sobre cirurgias plásticas periodontais deve-se principalmente ao aumento da demanda de pacientes que buscam por melhoria na estética bucal. No que diz respeito às cirurgias plásticas de aumento de mucosa ceratinizada e recobrimento radicular, o tratamento padrão ouro são enxerto gengival livre e enxerto conjuntivo subepitelial. Todavia, devido a maior morbidade pós-operatória, quantidade limitada de tecido doador e maior tempo cirúrgico, a busca por um biomaterial substituto de tecido mole tem crescido substancialmente. O objetivo desta revisão de literatura foi avaliar a previsibilidade e viabilidade da matriz de colágeno suíno como um substituto dos enxertos livres autógenos nas cirurgias plásticas periodontais. Por se tratar do biomaterial substituto de tecido mole mais recentemente estudado na literatura, a matriz ainda precisa ser avaliada para melhor previsibilidade de sucesso clínico. De acordo com a literatura revisada, estudos mostram que a matriz apresenta resultados satisfatórios, tanto no aumento de mucosa ceratinizada como em recobrimento radicular. Entretanto, poucos estudos avaliam sua efetividade em longo prazo. Concluiu-se que, apesar dos estudos apontarem que a matriz Mucograft® pode ser uma alternativa aos enxertos autógenos, seu custo é bastante elevado, o que pode inviabilizar sua utilização. Devido a poucos estudos com acompanhamento longitudinal, sua previsibilidade é ainda desconhecida (AU).


The considerable increase of research in the literature on periodontal plastic surgery is mainly due to increased demand from patients looking for improved oral aesthetics. With regard to the gain of keratinized mucosa and root coverage, the gold standard treatment are free gingival graft and subepithelial connective graft respectively. However, due to increased postoperative morbidity, limited amount of donor tissue and increased surgical time, the search for a biomaterial soft tissue replacement have grown substantially. The aim of the present study was to assess the predictability and feasibility of porcine collagen matrix, as a substitute for autogenous free graft in the periodontal plastic surgery. Since it is the replacement soft tissue biomaterial most recently studied in the literature, the matrix still needs to be evaluated to better predictability of clinical success. According to the literature reviewed, studies show that the porcine matrix presents satisfactory results both in gain of keratinized tissue such as in root coverage. However, few studies have evaluated its effectiveness in an adequate follow up. Although studies suggest that Mucograft® matrix can be an alternative to autogenous bone grafts, their cost is very high, which can make it impossible to use. In addition, due to few studies with longitudinal follow-up, its predictability is still unknown (AU).


Assuntos
Colágeno , Estética Dentária , Mucosa Bucal , Procedimentos Cirúrgicos Reconstrutivos/métodos , Suínos , Transplantes/cirurgia , Brasil
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...