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1.
J Prosthodont ; 25(7): 576-579, 2016 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26489039

RESUMEN

PURPOSE: To evaluate the bond strength between two types of acrylic resin teeth and a microwave denture base resin after immersion in disinfectant solutions for 180 days. MATERIALS AND METHODS: Eighty specimens made of acrylic resin teeth (Biotone and Biotone IPN) attached to a microwave polymerized denture base resin (Nature-Cryl MC) were divided into eight groups (n = 10) according to the treatment (distilled water-control, 2% chlorhexidine digluconate, 1% sodium hypochlorite and sodium perborate solution-Corega Tabs). The shear strength tests (MPa) were carried out using a universal testing machine with a 0.5 mm/min speed. Data analysis was performed using ANOVA and multiple comparison Student-Newman-Keuls post hoc test (α = 0.05). RESULTS: Biotone IPN showed similar results among the groups (distilled water, 8.25 ± 1.81 MPa; chlorhexidine, 7.81 ± 3.34 MPa; hypochlorite, 7.75 ± 3.72 MPa; and Corega Tabs, 7.58 ± 2.27 MPa, whereas Biotone showed significantly lower shear bond strength values for the groups immersed in Corega Tabs (5.25 ± 3.27 MPa) and chlorhexidine (6.08 ± 2.35 MPa). CONCLUSIONS: Soaking the dentures in 1% sodium hypochlorite could be recommended as a disinfectant solution for dentures fabricated with conventional acrylic resin denture teeth and microwave denture base resin. For dentures fabricated with IPN teeth and microwave denture base resin, all the soaking solutions evaluated in this study could be suggested to denture wearers.


Asunto(s)
Recubrimiento Dental Adhesivo , Bases para Dentadura , Microondas , Diente Artificial , Resinas Acrílicas , Desinfectantes , Humanos , Ensayo de Materiales , Propiedades de Superficie
2.
J Prosthet Dent ; 115(4): 462-8, 2016 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-26548879

RESUMEN

STATEMENT OF PROBLEM: The difficulty of removing denture adhesive is a common problem reported by users of these products. PURPOSE: The purpose of this clinical study was to investigate the effectiveness of different cleaning protocols for removing a denture adhesive (DA) and the influence on the oral microbiota. MATERIAL AND METHODS: Twenty participants wearing well-fitting complete dentures were instructed to use a denture adhesive 3 times a day during a 4-week trial, divided into 4 stages: (A) control-3 daily denture brushings using water at ambient temperature, (B)-3 daily denture brushings using water at ambient temperature plus coconut soap, (C)-3 daily denture brushings using water at ambient temperature plus dentifrice; (D)-3 daily denture brushings using water at ambient temperature combined with immersion in sodium perborate solution for 5 minutes before nocturnal sleep. After each 1-week stage, saliva specimens were collected. A dye was used to display and quantify the remaining DA on the internal surface of the maxillary dentures as a percentage. For microbiological analysis, the saliva was diluted and plated onto Petri dishes containing a nonselective culture medium and Candida spp culture media. After the incubation period, Candida species were identified and the number of colony forming units (CFU/mL) was calculated. RESULTS: A significant difference was found among the 4 cleaning methods for the quantification of remaining DA (Friedman, P=.036). Brushing the dentures with coconut soap, dentifrice, or water combined with immersion in sodium perborate solution was more effective in removing DA than brushing with only water. The cleaning methods did not influence the quantification of microorganisms in general or Candida albicans and other Candida species in particular. CONCLUSIONS: Brushing the dentures with coconut soap, dentifrice, or water combined with immersion in sodium perborate solution was more effective for removing cream-type denture adhesive than brushing with only water.


Asunto(s)
Adhesivos/química , Biopelículas/crecimiento & desarrollo , Limpiadores de Dentadura , Boca/microbiología , Carga Bacteriana , Recuento de Colonia Microbiana , Estudios Cruzados , Cementos Dentales , Humanos , Microbiota , Jabones , Propiedades de Superficie , Cepillado Dental
3.
ROBRAC ; 18(45): 27-34, jun. 2009. ilus, tab
Artículo en Portugués | LILACS-Express | LILACS | ID: lil-528526

RESUMEN

O objetivo desse estudo foi investigar a perda mineral do esmalte não desgastado ao redor de selantesionoméricos aderidos por sistemas autocondicionantes. Trinta e dois incisivos bovinos foram distribuídosem 3 grupos segundo o tratamento da superfície de esmalte: Prompt (Pr), Xeno III (Xe), Vitremer Primer (VP)e um outro grupo (controle) utilizando resina composta (RC). Após o tratamento do esmalte, um cilindro deionômero de vidro Vitremer foi construído, com exceção do grupo RC, onde foi utilizado o compósito Z250.Os espécimes foram submetidos à desafio cariogênico e seccionados, ao final do mesmo, para realizaçãode testes de dureza. Edentações foram realizadas em 3 regiões para cada uma das faces incisal e cervical,até a profundidade de 300 μm. Apenas para o grupo RC foi observada perda mineral significante na regiãoexterna à margem esmalte-resina. Nessa mesma região, a comparação dos grupos (testes de Mann-Withney)demonstrou que os maiores valores de perda mineral foram obtidos para o grupo RC, enquanto nenhumadiferença foi observada para VP, Pr e Xe. Pôde ser concluido que a utilização de sistemas adesivosautocondicionantes simplificados não afetou de forma adversa o efeito cariostático do cimento de ionômerode vidro modificado por resina aplicado ao esmalte não desgastado.


The purpose of this study was to investigate the mineral loss of the unground enamel around resinmodifiedglass ionomer sealants bonded with one-step self-etching adhesive systems. Thirty-two bovine incisorswere randomly assigned into 4 groups according to the enamel surface treatment: Prompt (Pr), Xeno III(Xe), Vitremer (VP) or resin (RC). Followed the enamel treatment, a cylinder of Vitremer was built-up, exceptfor RC where a composite resin Z250 was used. The teeth were submitted to a cariogenic challenge and cutinto halves by the end of the cycle to enamel hardness determination. Indentations were performed in threeregions for each face, incisal and cervical, up to the depth of 300 μm. As results, only for RC it was detectedsignificant mineral loss in the external area of the enamel-resin margin. For that same area, the comparisonof the groups (Mann-Withtney tests) demonstrated the highest mineral lost for RC, while no difference wasobserved among VP, Pr and Xe. It could be concluded that the use of one-step self-etching adhesive systemsas intermediary layer to improve the retention of a resin-modified glass-ionomer sealant to the ungroundenamel did not adversely influence its cariostatic effect.

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