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1.
Rev. bras. odontol ; 77(1): 1-5, jan. 2020. ilus, tab
Artigo em Inglês | LILACS | ID: biblio-1117693

RESUMO

Objetivo: este estudo teve como objetivo comparar a resistência de união à dentina de um material à base de silicato de cálcio fotopolimerizável modificado por resina (TheraCal LC®; Bisco, Schaumburg, IL, EUA) com MTA branco (WMTA®; Angelus, Londrina, PR, Brasil). Materiais e Métodos: dezesseis incisivos superiores e caninos humanos foram selecionados e três discos de 1 mm foram obtidos a partir do terço médio de cada raiz. Na superfície coronal de cada disco, dois furos de 1,2 mm de largura foram perfurados na dentina. Em seguida, os buracos artificiais foram preenchidos com um dos materiais testados: WMTA® e TheraCal LC®. As fatias dentárias preenchidas foram armazenadas em uma solução salina tamponada com fosfato (PBS) (pH 7,2) por 7 dias a 37°C. Depois disso, a avaliação do push-out foi realizada com uma ponta do êmbolo de 1,0 mm. A carga foi aplicada a uma velocidade de 0,5 mm / min até o deslocamento do selador. Os resultados foram expressos em MPa. O teste U de Mann-Whitney foi aplicado para classificar os materiais quanto à resistência adesiva à dentina. O nível de significância foi estabelecido em = 5%. Resultados: todas as amostras apresentaram resultados de resistência de união à dentina mensuráveis e não ocorreram falhas prematuras. O TheraCal LC® demonstrou valores superiores de resistência de união à dentina quando comparado ao WMTA® (P<0,0001). Conclusões: existe uma vantagem do TheraCal LC® sobre o WMTA® no que diz respeito à resistência da união ao empurrar e, portanto, pode ser considerado um material reparador promissor e inovador


Objective: this study aimed to compare the dentin bond strength of a resin-modified light-curable calcium-silicate-based material (TheraCal LC®; Bisco, Schaumburg, IL, USA) with White MTA (WMTA®; Angelus, Londrina, PR, Brazil). Materials and Methods: sixteen human maxillary incisors and canines were selected and three 1-mm-discs were obtained from the middle third of each root. On the coronal surface of each disc, two 1.2-mm-wide-holes were drilled through the dentin. Then, artificial holes were filled with one of the tested materials: WMTA® and TheraCal LC®. The filled dental slices were stored in a phosphate-buffered saline (PBS) solution (pH 7.2) for 7 days at 37°C. After that, push-out assessment was performed with a 1.0-mm-plunger-tip. Load was applied at a crosshead speed of 0.5 mm/min until sealer displacement. The results were expressed in MPa. Mann-Whitney U test was applied to rank materials regarding dentin push-out bond strength. Significance level was set at a = 5%. Results: All specimens showed measurable results and no premature failure occurred. TheraCal LC® demonstrated superior push-out bond strength values to dentin when compared to WMTA® (P<0.0001). Conclusions: there is advantage of TheraCal LC® over WMTA® as regards to the push-out bond strength and, therefore it may be taken as a promising and innovative reparative material


Assuntos
Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular , Tratamento do Canal Radicular , Cimento de Silicato , Materiais Dentários , Endodontia , Cura Luminosa de Adesivos Dentários
2.
Braz Dent J ; 29(2): 195-201, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29898068

RESUMO

This study investigated the bond strength of two experimental root canal sealers based on MTA and butyl ethylene glycol disalicylate: MTAe and MTAe-HA. The reference materials used for comparison were AH Plus and MTA Fillapex. Twenty human upper incisors were selected and one 1 mm slice was obtained from the cervical third of each root. On the coronal surface of each slice, four 0.9 mm wide holes were drilled through the dentine. Standardized irrigation was performed and holes were filled with one of the four tested sealers: AH Plus, MTA Fillapex, MTAe, and MTAe-HA. The filled slices were stored in a PBS solution (pH 7.2) for 7 days at 37 °C. A push-out assessment was performed with a 0.7 mm plunger tip. Load was applied at a crosshead speed of 0.5 mm/min until sealer displacement. The results were expressed in MPa. The Kruskal-Wallis test was applied to assess the effect of each sealer on the push-out bond strength. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05. Significant differences among medians values obtained by materials were observed (p<0.001). AH Plus displayed the highest value of bond strength (p<0.001). In contrast, MTA Fillapex presented the lowest bond strength among all tested sealers (p<0.001). Experimental sealers showed intermediary bond strength values, with no statistical differences between them (p>0.05). In conclusion, experimental root canal sealers presented suitable bond strength outcomes when compared to MTA Fillapex.


Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Etilenoglicol/química , Etilenoglicóis/química , Teste de Materiais , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Salicilatos/química , Silicatos/química , Colagem Dentária/métodos , Combinação de Medicamentos , Humanos
3.
Braz. dent. j ; 29(2): 195-201, Mar.-Apr. 2018. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-951536

RESUMO

Abstract This study investigated the bond strength of two experimental root canal sealers based on MTA and butyl ethylene glycol disalicylate: MTAe and MTAe-HA. The reference materials used for comparison were AH Plus and MTA Fillapex. Twenty human upper incisors were selected and one 1 mm slice was obtained from the cervical third of each root. On the coronal surface of each slice, four 0.9 mm wide holes were drilled through the dentine. Standardized irrigation was performed and holes were filled with one of the four tested sealers: AH Plus, MTA Fillapex, MTAe, and MTAe-HA. The filled slices were stored in a PBS solution (pH 7.2) for 7 days at 37 °C. A push-out assessment was performed with a 0.7 mm plunger tip. Load was applied at a crosshead speed of 0.5 mm/min until sealer displacement. The results were expressed in MPa. The Kruskal-Wallis test was applied to assess the effect of each sealer on the push-out bond strength. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05. Significant differences among medians values obtained by materials were observed (p<0.001). AH Plus displayed the highest value of bond strength (p<0.001). In contrast, MTA Fillapex presented the lowest bond strength among all tested sealers (p<0.001). Experimental sealers showed intermediary bond strength values, with no statistical differences between them (p>0.05). In conclusion, experimental root canal sealers presented suitable bond strength outcomes when compared to MTA Fillapex.


Resumo Esse estudo investigou a resistência de união de dois cimentos endodônticos experimentais à base de MTA e butiletilenoglicol dissalicilato: MTAe e MTAe. Os materiais de referência utilizados para comparação foram os cimentos endodônticos MTA Fillapex e AH Plus. Vinte incisivos superiores humanos foram selecionados e um slice dentinário de 1 mm de espessura foi obtido do terço cervical de cada raiz. Na superfície coronária de cada slice, quatro orifícios com 0,9 mm de diâmetro foram confeccionados através da dentina. Uma irrigação padronizada foi realizada e os orifícios foram preenchidos com um dos quatro cimentos endodônticos avaliados: AH Plus, MTA Fillapex, MTAe, e MTAe-HA. Os slices preenchidos foram armazenados em solução PBS (pH 7,2) durante 7 dias a 37°C. O ensaio de push-out foi realizado por meio de um dispositivo com 0,7 mm de diâmetro. A carga foi aplicada com a velocidade de 0,5 mm/min até a obtenção de deslocamento do material obturador. Os resultados foram expressos em MPa. O teste de Kruskal-Wallis foi aplicado para avaliar o efeito da resistência de união de cada cimento endodôntico. O teste de Mann-Whitney com correção de Bonferroni foi utilizado para isolamento das diferenças. O erro do tipo-alfa foi fixado em 0,05. Diferenças significantes entre os valores de medianas obtidos pelos materiais foram observados (p<0,001). O AH Plus demonstrou os maiores valores de resistência de união (p<0,001). Em contraste, o MTA Fillapex apresentou a menor resistência de união entre todos os cimentos testados (p<0,001). Os cimentos experimentais demonstraram valores intermediários, com ausência de diferenças estatísticas entre si (p>0,05). Em conclusão, os cimentos endodônticos experimentais à base de MTA e butiletilenoglicol dissalicilato apresentaram resultados adequados de resistência de união quando comparados ao MTA Fillapex.

4.
J Endod ; 43(5): 801-804, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28292603

RESUMO

INTRODUCTION: The present study investigated the root canal dentin bond strength of 2 newly developed fast-setting mineral trioxide aggregate (MTA) and pozzolan-based cements: ENDOCEM MTA (Maruchi, Wonju, Korea) and ENDOCEM Zr (Maruchi). White MTA (Angelus, Londrina, Brazil) was used as the reference material for comparison. METHODS: Root slices (1 mm ± 0.1 mm) were obtained from the middle third of 15 maxillary incisors previously selected. Three canal-like holes (0.8 diameter) were drilled perpendicularly on the axial surface of each root slice. A standardized irrigation protocol was applied for all samples, and after drying, each hole was filled with 1 of 3 test repair materials. Finally, slices were stored in contact with phosphate-buffered saline solution (pH = 7.2) for 7 days at 37°C before the push-out assay. Data were nonparametrically evaluated at α = 5%. RESULTS: The Friedman test was unable to confirm a significant dissimilarity in push-out ranks among the tested cements (P = .220). CONCLUSIONS: The new fast-setting MTA and pozzolan-based cements ENDOCEM MTA and ENDOCEM Zr present suitable bond strength performance, which is comparable with white MTA.


Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Colagem Dentária , Cimentos Dentários/química , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Bismuto/química , Colagem Dentária/métodos , Colagem Dentária/normas , Análise do Estresse Dentário , Combinação de Medicamentos , Humanos , Zircônio/química
5.
Braz Dent J ; 27(6): 652-656, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27982174

RESUMO

The aim of the present study was to evaluate the cytotoxic effects of five endodontic sealers (AH Plus, Endomethasone N, EndoSequence BC, MTA Fillapex and Pulp Canal Sealer EWT) using a three-dimensional (3D) cell culture model. A conventional bi-dimensional (2D) cell culture model was used as reference technique for comparison. Balb/c 3T3 fibroblasts were cultured in conventional bi-dimensional cell culture and in rat-tail collagen type I three-dimensional cell culture models. Then, both cell cultures were incubated with elutes of freshly mixed endodontic sealers for 24 h. Cell viability was measured by the methyl-thiazol-diphenyltetrazolium assay (MTT). Data were statistically analyzed using ANOVA and the Tukey test at a significance level of p<0.05. All tested sealers exhibited cytotoxic effects; however, cytotoxic effect was culture model- and sealer-dependent. Sealers showed higher cytotoxicity in 2D than in 3D cell culture model (p<0.05). In both conditions, EndoSequence BC showed the lowest cytotoxicity (p<0.05). MTA Fillapex was much more cytotoxic than the other tested endodontic sealers (p<0.05), with the exception of AH Plus in the 2D cell culture model (p>0.05). Endomethasone N and Pulp Canal Sealer EWT showed lower cytotoxic effects than AH Plus in 2D cell culture model (p<0.05); however no statistical differences was observed among these sealers in 3D cell culture model. It may be concluded that cytotoxicity was higher in 2D cell culture compared to 3D cell culture. EndoSequence BC sealer exhibited the highest cytocompatibility and MTA Fillapex the lowest cytocompatibility.


Assuntos
Materiais Restauradores do Canal Radicular , Células 3T3 , Animais , Camundongos , Camundongos Endogâmicos BALB C
6.
Braz. dent. j ; 27(6): 652-656, Nov.-Dec. 2016. tab, graf
Artigo em Inglês | LILACS | ID: biblio-828068

RESUMO

Abstract The aim of the present study was to evaluate the cytotoxic effects of five endodontic sealers (AH Plus, Endomethasone N, EndoSequence BC, MTA Fillapex and Pulp Canal Sealer EWT) using a three-dimensional (3D) cell culture model. A conventional bi-dimensional (2D) cell culture model was used as reference technique for comparison. Balb/c 3T3 fibroblasts were cultured in conventional bi-dimensional cell culture and in rat-tail collagen type I three-dimensional cell culture models. Then, both cell cultures were incubated with elutes of freshly mixed endodontic sealers for 24 h. Cell viability was measured by the methyl-thiazol-diphenyltetrazolium assay (MTT). Data were statistically analyzed using ANOVA and the Tukey test at a significance level of p<0.05. All tested sealers exhibited cytotoxic effects; however, cytotoxic effect was culture model- and sealer-dependent. Sealers showed higher cytotoxicity in 2D than in 3D cell culture model (p<0.05). In both conditions, EndoSequence BC showed the lowest cytotoxicity (p<0.05). MTA Fillapex was much more cytotoxic than the other tested endodontic sealers (p<0.05), with the exception of AH Plus in the 2D cell culture model (p>0.05). Endomethasone N and Pulp Canal Sealer EWT showed lower cytotoxic effects than AH Plus in 2D cell culture model (p<0.05); however no statistical differences was observed among these sealers in 3D cell culture model. It may be concluded that cytotoxicity was higher in 2D cell culture compared to 3D cell culture. EndoSequence BC sealer exhibited the highest cytocompatibility and MTA Fillapex the lowest cytocompatibility.


Resumo O objetivo do presente estudo foi avaliar os efeitos citotóxicos de cinco cimentos endodônticos (AH Plus, Endomethasone N, EndoSequence BC, MTA Fillapex e Pulp Canal Sealer EWT) utilizando um modelo de cultura celular tridimensional (3D). Utilizou-se um modelo convencional de cultura de células bidimensionais (2D) como técnica de referência para comparação. Os fibroblastos Balb/c 3T3 foram cultivados em culturas de células bidimensionais convencionais e em modelos de cultura de células tridimensionais de colagéno de cauda de rato do tipo I. Em seguida, ambas as culturas de células foram incubadas com eluções dos cimentos endodônticos recém manipulados, durante 24 h. A viabilidade celular foi medida pelo ensaio de MTT. Os dados foram analisados estatisticamente utilizando ANOVA e o teste de Tukey com nível de significância de p<0,05. Todos os cimentos testados exibiram efeitos citotóxicos. Contudo, o efeito citotóxico foi dependente do modelo de cultura e do cimento testado. Os cimentos apresentaram maior citotoxicidade no modelo 2D do que no modelo 3D (p<0,05). Em ambas as condições, a EndoSequence BC apresentou a menor citotoxicidade (p<0,05). MTA Fillapex foi mais citotóxico do que os outros cimentos endodônticos testados (p<0,05), com exceção do AH Plus no modelo de cultura de células 2D (p>0,05). Endomethasone N e EWT mostraram efeitos citotóxicos mais baixos do que AH Plus no modelo de cultura de células 2D (p<0,05); entretanto, não houve diferenças estatísticas entre esses cimentos no modelo de cultura de células 3D. Pode concluir-se que a citotoxicidade foi maior na cultura de células 2D em comparação com a cultura de células 3D. EndoSequence BC selante exibiu a maior citocompatibilidade e MTA Fillapex a menor citocompatibilidade.


Assuntos
Animais , Camundongos , Materiais Restauradores do Canal Radicular , Células 3T3 , Camundongos Endogâmicos BALB C
7.
J Endod ; 42(11): 1656-1659, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-27641946

RESUMO

INTRODUCTION: The present study aimed to rank the bond strength to root dentin of a new injectable pozzolan-based root canal sealer, EndoSeal MTA, as compared with MTA Fillapex and AH Plus. METHODS: Eighteen dentinal slices (1 ± 0.1 mm) were obtained from the middle third of 6 maxillary incisors previously selected. Three canal-like holes with 0.8 mm diameter were drilled perpendicularly on the axial surface of each slice. Then, a standardized irrigation was applied for all holes that were subsequently filled with 1 of 3 test root canal sealers. After that, slices were stored in contact with phosphate-buffered saline solution (pH 7.2) for 7 days at 37°C before the push-out assay. Friedman test and Wilcoxon signed rank test with a Bonferroni correction were used to rank the results. Significance boundary was set at α = 5%. RESULTS: Friedman test confirmed a significant dissimilarity in push-out ranks among the tested cements (P < .01). Wilcoxon signed rank test demonstrated AH Plus had significant superior resistance to dislodgment compared with Endo Seal (P < .01) or MTA Fillapex (P < .01), whereas MTA Fillapex presented the lowest push-out values as compared with Endo Seal (P < .01) or AH Plus (P < .01). CONCLUSIONS: EndoSeal presents satisfactory bond strength performance for application in endodontic therapy compared with MTA Fillapex, and although it displays a new alternative of injectable bio-tight root canal sealer, it is not able to improve adhesion compared with AH Plus.


Assuntos
Cimentos para Ossos/química , Colagem Dentária , Materiais Restauradores do Canal Radicular/química , Cimento de Óxido de Zinco e Eugenol/química , Materiais Biocompatíveis/química , Compostos de Cálcio/química , Cavidade Pulpar , Dentina/química , Humanos , Irrigantes do Canal Radicular/química , Obturação do Canal Radicular/métodos , Preparo de Canal Radicular/métodos , Silicatos/química
8.
Rev. bras. odontol ; 73(3): 237-241, Jul.-Set. 2016. ilus
Artigo em Português | LILACS-Express | LILACS | ID: biblio-844035

RESUMO

Objetivo: O objetivo do presente trabalho foi revisar as publicações prévias sobre o EndoSequence BC Sealer com o intuito de avaliar os resultados obtidos por este cimento em relação às suas propriedades biológicas e físico-químicas, analisando-se, assim, de forma mais consistente, diversos âmbitos de sua atuação e possíveis desfechos de seu uso clínico realizar uma revisão de literatura sobre este material. Material e Métodos: Uma busca extensiva na literatura foi realizada para identificação de todos os artigos publicados sobre o cimento EndoSequence BC Sealer, considerando-se estudos que avaliaram suas propriedades biológicas e físico-químicas. A estratégia de busca foi fundamentada no acesso às bases de dados PubMed e Bireme. Resultados: Trinta e dois artigos satisfizeram os critérios de inclusão e foram utilizados na presente revisão. Os artigos demonstraram que o cimento possui radiopacidade, escoamento, solubilidade e alteração dimensional adequadas. Além disso, o cimento possui atividade antimicrobiana e é biocompatível. Conclusão: A avaliação dos trabalhos prévios do EndoSequence BC Sealer permite concluir que o cimento EndoSequence BC Sealer demonstrou performance satisfatória quanto as propriedades necessárias para um material obturador endodôntico.


Objective: The aim of this study was to review the previous publications of the EndoSequence BC Sealer in order to evaluate the results obtained using this sealer with regards to its biological and physicochemical properties; therefore, analyzing several areas of its performance and possible outcomes of its clinical use in a more reliable way. Material and Methods: A search of the literature was performed for the identification of all published articles using the EndoSequence BC Sealer, considering studies that evaluated its biological and physicochemical properties. The strategy of the search was based on access to the PubMed and Bireme databases. Results: Thirty-two manuscripts met the inclusion criteria and were used in this review. These manuscripts demonstrated that the sealer has adequate radiopacity, flow, solubility, and dimensional changes. Furthermore, the sealer has antimicrobial activity and is biocompatible. Conclusion: A review of the relevant literature suggests that the EndoSequence BC Sealer has demonstrated satisfactory performance in some important properties for a root canal sealer

9.
Braz Oral Res ; 30(1)2016 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-27305515

RESUMO

This study was designed to investigate the resistance to dislodgment provided by MTA HP, a new high-plasticity calcium silicate-based cement. Biodentine and White MTA Angelus were used as reference materials for comparison. Three discs 1 ± 0.1 mm thick were obtained from the middle third of the roots of 5 maxillary canines. Three 0.8-mm-wide holes were drilled on the axial surface of each root disc. Standardized irrigation was performed. Then the holes were dried with paper points and filled with one of the three tested cements. The filled dental slices were immersed in a phosphate-buffered saline (PBS) solution (pH 7.2) for 7 days before the push-out assessment. The Kruskal-Wallis test was applied to assess the effect of each endodontic cement on the push-out bond strength. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05. All specimens had measurable push-out values and no premature failure occurred. There were significant differences among the materials (p <0.05). The Biodentine specimens had the highest push-out bond strength values (p < 0.05). MTA HP had significantly higher bond strength than White MTA (p < 0.05). MTA HP showed better push-out bond strength than its predecessor, White MTA; however, Biodentine had higher dislodgment resistance than both MTA formulations.


Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Colagem Dentária/métodos , Cimentos Dentários/química , Óxidos/química , Silicatos/química , Bismuto/química , Combinação de Medicamentos , Humanos , Teste de Materiais , Reprodutibilidade dos Testes , Materiais Restauradores do Canal Radicular/química , Preparo de Canal Radicular/métodos , Estatísticas não Paramétricas , Fatores de Tempo
10.
Braz. oral res. (Online) ; 30(1): e84, 2016. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-952007

RESUMO

Abstract This study was designed to investigate the resistance to dislodgment provided by MTA HP, a new high-plasticity calcium silicate-based cement. Biodentine and White MTA Angelus were used as reference materials for comparison. Three discs 1 ± 0.1 mm thick were obtained from the middle third of the roots of 5 maxillary canines. Three 0.8-mm-wide holes were drilled on the axial surface of each root disc. Standardized irrigation was performed. Then the holes were dried with paper points and filled with one of the three tested cements. The filled dental slices were immersed in a phosphate-buffered saline (PBS) solution (pH 7.2) for 7 days before the push-out assessment. The Kruskal-Wallis test was applied to assess the effect of each endodontic cement on the push-out bond strength. Mann-Whitney with Bonferroni correction was used to isolate the differences. The alpha-type error was set at 0.05. All specimens had measurable push-out values and no premature failure occurred. There were significant differences among the materials (p <0.05). The Biodentine specimens had the highest push-out bond strength values (p < 0.05). MTA HP had significantly higher bond strength than White MTA (p < 0.05). MTA HP showed better push-out bond strength than its predecessor, White MTA; however, Biodentine had higher dislodgment resistance than both MTA formulations.

11.
Rio de Janeiro; s.n; s.n; 2015. 40 p. ilus.
Tese em Português | LILACS, BBO - Odontologia | ID: biblio-963925

RESUMO

O objetivo do presente estudo foi avaliar a influência de diferentes agentes quelantes [Ácido Etilenodiaminotetracético (EDTA) a 17%; Ácido Peracético (PA) a 2,25%; e Ácido Cítrico (CA) a 10%] na resistência ao deslocamento dos cimentos endodônticos à base de silicato de cálcio MTA Fillapex (Angelus, Londrina, Brasil) e Total Fill BC Sealer (FKG, La Chaux-de-Fonds, Suiça) após diferentes períodos de contato com tampão fosfato salino (PBS) (7 e 30 dias). O cimento à base de resina epóxica AH Plus (Dentsply DeTrey, Konstaz, Alemanha) foi utilizado como material de referência para comparação. Foram utilizados 30 incisivos humanos superiores, seccionados no terço cervical e apical, para a utilização do terço médio. O terço médio obtido foi seccionado horizontalmente, obtendo-se 3 slices de 1 mm de espessura (± 0.1 mm) de cada incisivo. Em cada slice foram usinados 3 orifícios de diâmetro 0.8 mm. As amostras foram distribuídas em 18 grupos (n=15) de acordo com a substância química auxiliar preconizada na remoção de smear layer, tipo de cimento e tempo de armazenamento em tampão fosfato salino (PBS). A irrigação foi realizada com a imersão em NaOCl a 2,5% por 15 min, água bidestilada a fim de neutralizar a ação do NaOCl e em seguida realizada a imersão no agente quelante pertinente a cada grupo por 3 min: EDTA, PA ou CA. A irrigação final foi conduzida com imersão em água bidestilada por 1 min, NaOCl a 2,5% por 1 min e água bidestilada novamente por 1 min. Os espécimes foram secos com cones de papel absorvente e cada orifício usinado foi preenchido com um dos cimentos endodônticos testados: MTA fillapex, Total Fill BC Sealer e AH Plus. As amostras foram armazenadas em ambiente umidificado com PBS (pH 7.2) sob temperatura de 37°C por 7 dias (T1) e 30 dias (T2). O ensaio de push-out utilizou um dispositivo de 0,6 mm de diâmetro e a carga foi aplicada com a velocidade de 0,5 mm/min até o deslocamento do material obturador, sendo o resultado expresso em N e convertido em MPa. A análise estatística dos valores de resistência ao deslocamento foi realizada através dos testes de Kruskal-Wallis e Mann Whitney com o nível de significância estabelecido em α=5%. Os resultados obtidos demonstraram que os agentes quelantes e os diferentes tempos de armazenamento em PBS não influenciaram significativamente a resistência ao deslocamento (P=0,846 e P=0,104, respectivamente). Em contrapartida, os cimentos endodônticos afetaram significativamente a resistência ao deslocamento (P=0,000). O AH Plus apresentou maior resistência ao deslocamento quando comparado ao Total Fill BC Sealer e MTA Fillapex (P=0,000). MTA Fillapex demonstrou os menores valores de resistência ao deslocamento (P=0,000). De acordo com os resultados descritos, pode-se concluir que os diferentes agentes quelantes empregados na remoção não influenciaram a resistência ao deslocamento dos cimentos endodônticos à base de silicato de cálcio.


The aim of the present study was to evaluate the effect of different chelating agents [17% ethylenediaminetetraceticacid (EDTA), 2.25% peracetic acid (PA) or 10% citric acid (CA)] in the push-out bond strength of calcium silicate based sealers MTA Fillapex (Angelus, Londrina, Brazil) and Total Fill BC Sealer (FKG, La Chaux-de-Fonds, Switzerland) after immersion in PBS for 7 or 30 days. AH Plus (Dentsply DeTrey, Konstaz, Germany) an epoxy base sealer was used as a reference material for comparison. From the middle third of the roots of 30 upper incisors, three dentin discs 1 ± 0.1 mm thick were obtained by horizontal section. In each slice, three 0.8-mm-wide holes were drilled and the samples were distributed in 18 groups (n=15) according to the chelating agent, endodontic sealer and period of immersion in PBS. Irrigation was performed with 2,5% NaOCl for 15 min, bidistilled water to neutralize NaOCl and then immersion in the chelating solutions proposed to each group: EDTA, PA or CA for 3 min. The final irrigation was performed with bidistilled water for 1 min, NaOCl for 1 min, and bidistilled water for 1 min. Holes were dried with absorbent paper and filled with one of the three tested root canal sealers. The filled dental slices were stored in contact to PBS solution (pH 7.2) for 7 days (T1) or 30 days (T2) at 37°C. The push-out bond strength assessment used a 0.6 mm plunger tip and the load was applied at a crosshead speed of 0.5 mm/min until the sealer displacement. The results were recorded in Newtons, then converted and expressed in MPa. Kruskal-Wallis and Mann Whitney tests were used and cutting level for significance was set at α = 5%. Solutions and periods of immersion were found not to significantly influence the displacement resistance (P=0.846, and P=0.104, respectively). On the other hand, the type of sealer significantly affected the push-out bond strength (P=0.000). AH Plus provided a superior resistance to dislodgment compared to Total Fill BC Sealer and MTA Fillapex (P=0.000). MTA Fillapex resulted in the lowest push-out bond strenght (P=0.000). According to the results of the present study, it can be concluded that the use of different chelating agents and different periods of immersion in PBS does not influenced the push-out bond strength of endodontic sealers.


Assuntos
Humanos , Irrigantes do Canal Radicular , Calcarea Silicata/uso terapêutico , Quelantes , Adesivos , Camada de Esfregaço , Cimentos Dentários , Teste de Materiais , Estatísticas não Paramétricas , Cimentos de Resina , Incisivo
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