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1.
Restor Dent Endod ; 42(2): 125-133, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28503478

RESUMO

OBJECTIVES: This study compared the effect of hexamethyldisiloxane (HMDSO) and ammonia (NH3) plasmas on the bond strength of resin cement to fiber posts with conventional treatments. MATERIALS AND METHODS: Sixty-five fiber posts were divided into 5 groups: Control (no surface treatment); H2O2 (24% hydrogen peroxide for 1 min); Blasting (blasting with aluminum oxide for 30 sec); NH3 (NH3 plasma treatment for 3 min); HMDSO (HMDSO plasma treatment for 15 min). After the treatments, the Ambar adhesive (FGM Dental Products) was applied to the post surface (n = 10). The fiber post was inserted into a silicon matrix that was filled with the conventional resin cement Allcem Core (FGM). Afterwards, the post/cement specimens were cut into discs and subjected to a push-out bond strength (POBS) test. Additionally, 3 posts in each group were evaluated using scanning electron microscopy. The POBS data were analyzed by one-way analysis of variance and the Tukey's honest significant difference post hoc test (α = 0.05). RESULTS: The Blasting and NH3 groups showed the highest POBS values. The HMDSO group showed intermediate POBS values, whereas the Control and H2O2 groups showed the lowest POBS values. CONCLUSION: Blasting and NH3 plasma treatments were associated with stronger bonding of the conventional resin cement Allcem to fiber posts, in a procedure in which the Ambar adhesive was used.

2.
Rev. bras. odontol ; 73(4): 283-287, Out.-Dez. 2016. ilus, tab
Artigo em Português | LILACS-Express | LILACS | ID: biblio-844043

RESUMO

Objetivo: avaliar o efeito do hipoclorito de sódio (NaOCl) na resistência de união (RU) de pinos de fibra de vidro cimentados à dentina, utilizando o cimento resinoso convencional AllCem ou o autoadesivo RelyX U200. Material e Métodos: foram utilizados 40 dentes bovinos, que tiveram suas coroas removidas e as raízes padronizadas em 7mm, referente aos terços cervical e médio. Os condutos foram preparados e as raízes divididas em 4 grupos (n = 10). Nos grupos AD/U200 e AD/AAC os condutos foram irrigados com água destilada. Nos grupos NaOCl/U200 e NaOCl/AAC, os condutos foram imersos em NaOCl a 5,25% durante 20 minutos e, em seguida, irrigados com água destilada. Os pinos foram cimentados ao conduto com o cimento RelyX U200 nos grupos AD/U200 e NaOCl/U200, e com o cimento Allcem nos grupo AD/AAC e NaOCl/AAC. As raízes foram segmentadas e os discos submetidos a ensaio de push-out. Os valores de RU foram analisados estatisticamente pelos testes de Kruskal-Wallis e Mann Whitney (α = 0,05). A análise do padrão de fratura das amostras foi realizada em lupa estereoscópica. Resultados: o NaOCl mostrou um efeito deletério na resistência adesiva para ambos os cimentos. Os valores de RU foram superiores para os grupos Âmbar/AllCem em comparação aos grupos RelyX U200. Em relação ao padrão de fratura, houve predomínio de fratura tipo I, adesiva cimento/dentina. Conclusão: o NaOCl mostrou um efeito deletério na resistência de união de pinos de fibra cimentados à dentina utilizando os cimentos RelyX U200 e Âmbar/AllCem.


Objective: to evaluate the effect of sodium hypochlorite (NaOCl) on the bond strength (BS) of fiberglass posts cemented to dentin using the conventional cement Allcem or the self-adhesive cement RelyX U200. Materials and Methods: forty bovine teeth had their crowns removed and the roots standardized in 7 mm, referring to the cervical and middle thirds. The root canals were prepared and roots were divided into four groups (n = 10). In AD/U200 and AD/AAC groups, the root canals were irrigated with distilled water. In NaOCl/U200 and NaOCl/AAC groups, the root canals were immersed in 5.25% NaOCl for 20 min and then irrigated with distilled water. The posts were cemented with RelyX U200 in groups AD/U200 and NaOCl/U200, and with Allcem cement in groups AD/AAC and NaOCl/AAC. The roots were segmented and discs were subjected to the push-out test. The BS values were statistically analyzed by Kruskal-Wallis and Mann-Whitney tests (α = 0.05). The fracture pattern was analyzed using a stereomicroscope. Results: the NaOCl showed a deleterious effect on bond strength for both cements. The RU values were higher for Ambar/Allcem groups compared with the U200 groups. Regarding the fracture pattern, there was a predominance of type I, adhesive cement/dentin. Conclusion: NaOCl showed a deleterious effect on the bond strength of fiber posts cemented to dentin using RelyX U200 and Allcem cements.

3.
Rev. odontol. UNESP (Online) ; 45(2): 121-126, mar.-abr. 2016. tab, graf
Artigo em Português | LILACS-Express | LILACS | ID: lil-780072

RESUMO

Resumo Introdução Os pinos de fibra de vidro são uma alternativa aos núcleos metálicos e apresentam vantagens, tais como: estética, módulo de elasticidade semelhante à dentina e cimentação imediata após o término do tratamento endodôntico. Ainda, apresentam a capacidade de aderir ao cimento resinoso e este, à dentina, por meio de técnicas adesivas. Objetivo Comparar a adesão de um cimento resinoso convencional e um autoadesivo a pinos de fibra de vidro, e os efeitos de diferentes tratamentos de superfície na resistência adesiva dos pinos. Material e método Trinta pinos foram divididos em três grupos: Controle: sem tratamento na superfície; Jateamento: jateamento com óxido de alumínio por 30 segundos, e Peróxido: imersão em peróxido de hidrogênio 24% por um minuto. Em seguida, corpos de prova foram obtidos a partir de cilindros de cimento resinoso contendo o pino de fibra posicionado no centro de seu longo eixo. Em cada grupo, cinco pinos foram associados ao adesivo Âmbar + cimento convencional AllCem Core e os outros cinco pinos, ao cimento autoadesivo RelyX U200. O conjunto pino/cimento foi segmentado e avaliado em relação à resistência de união (RU) por push-out. Os dados foram analisados estatisticamente pelos testes de ANOVA e Tukey (p<0,05). Resultado Os cimentos avaliados exibiram valores de RU semelhantes. Em relação aos tratamentos de superfície, os maiores valores de RU foram encontrados no grupo Jateamento. Conclusão O cimento convencional, AllCem Core, e o cimento autoadesivo, RelyX U200, mostraram valores de resistência de união semelhantes. Ainda, o jateamento com óxido de alumínio favoreceu a adesão dos pinos aos cimentos.


Abstract Introduction The fiberglass posts are an alternative to the metal cast, presenting some advantages, such as aesthetics, tensile modulus similar to dentin and can be placed in a single session, immediately after the endodontic treatment. It also has the ability to adhere to the resin cement and the last to dentin by means of bonding techniques. Objective To compare the adhesion of a conventional resin cement with a self-adhesive to fiberglass posts, and the effects of different surface treatments on adhesion of posts. Material and method Thirty fiber posts were divided into 3 groups: control: untreated surface; Blasting: blasting with aluminum oxide for 30 seconds and peroxide: immersion in 24% hydrogen peroxide for 1 minute. Then, the samples were obtained from resin cement cylinders containing the fiber post positioned in the center of its long axis. In each group 5 posts were associated with the adhesive Ambar+conventional cement Allcem Core and the other 5 posts with the self-adhesive cement RelyX U200. The post/cement sample was segment in discs and evaluated for bond strength (BS) by push-out test. Data were analyzed statistically by ANOVA and Tukey tests (p<0.05). Result The cements evaluated exhibited similar BS values. Regarding surface treatments, the highest BS values were found in blasting group. Conclusion Conventional cement, Allcem Core, and self-adhesive, RelyX U200, showed similar bond strength values. Also, blasting with aluminum oxide favored the adhesion of posts to cements.

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