Avaliação da adaptação interna, resistência de união e resistência à fratura da associação entre resinas bulk-fill e adesivos simplificados em dentes tratados endodonticamente
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Data
2019-03-21
Autores
Girotto, Aline Carvalho
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do presente estudo foi avaliar a adaptação interna (AI), resistência de união (RU) e resistência à fratura (RF) da associação entre resinas bulk-fill de alta viscosidade e adesivos simplificados, quando utilizados para restaurar dentes que foram endodonticamente tratados. Foram avaliados 4 sistemas restauradores comerciais, sendo eles Grupo Controle (GC): Scotchbond Multi-Purpose + Filtek Z350XT (3M/ESPE); (SBU/FBF) Single Bond Universal + Filtek Bulk-fill (3M/ESPE); (OBA/SF) OptBond All-in-one + Sonic Fill (Kerr) e (TBU/TBF)Tetric-N- Bond Universal + Tetric-N-Ceram Bulk-Fill (Ivoclar/Vivadent). Em 32 pré-molares humanos, a superfície oclusal foi planificada, cavidades classe I padronizadas foram confeccionadas e os dentes foram tratados endodonticamente .A irrigação foi feita com hipoclorito de sódio (NaOCl) 2,5% e EDTA 17%. Após a obturação (AH Plus, Dentsply, De Trey, Konstanz, Germany) e a limpeza da câmara pulpar com álcool 99%, foi aplicada uma fina camada de cimento de ionômero de vidro modificado por resina Ionoseal (VOCO, GmbH, Vuxhaven, Alemanha). Os dentes foram então divididos nos grupos experimentais (n=8), e as restaurações foram realizadas. Após 24 horas, os espécimes receberam um corte centralizado, as metades obtidas foram polidas e réplicas em resina epóxi para a avaliação da AI em microscopia eletrônica de varredura foram confeccionadas. Em 40 terceiros molares humanos, um corte foi feito para exposição da dentina profunda. Após a padronização da smear layer (lixa #600), este tecido foi tratado com NaOCl 2,5% por 30 min, EDTA 17% por 3 min, impregnação com cimento AH Plus o qual ficou em contato com a dentina por 5min e limpeza com álcool 99%. Os espécimes foram dividos aleatoriamente nos 4 grupos experimentais (n=10), após a aplicação do sistema adesivo um bloco com a respectiva resina foi confeccionado. Após 24horas os espécimes foram seccionados e submetidos ao teste de microtração. O ensaio foi realizado em dois tempos: após 24 horas e após 1 ano de armazenamento em água destilada. Em 50 pré-molares humanos, o tratamento endodôntico foi realizado conforme descrito anteriormente. Neste estudo além de serem avaliados os grupos experimentais também foi avaliado um controle negativo (GCN) (n=10) constituído de dentes tratados endodonticamente sem restauração. O teste de RF foi realizado na máquina de ensaios universal. Os dados foram avaliados através do teste de ANOVA e, quando necessário ao teste de Tukey, com nível de significância de 5%. Quanto à AI, a maior porcentagem de GAPs formou-se para a resina SonicFill e não houve diferença estatística entre as demais resinas estudadas (p>0,05). No período de 24 horas, não houve diferença estatisticamente significante na RU entre os sistemas adesivos estudados (p>0,05). No entanto, após o armazenamento de 1 ano, o SBU foi o único que não apresentou redução da RU (p<0,05), não houve diferença estatisticamente significante dos resultados encontrados após 24 horas (p>0,05). Os adesivos simplificados OBA e SBU apresentaram os mesmos valores de RU que o sistema SBMP (Condiciona e lava de 3 passos) (p>0,05).O TBU além de apresentar uma redução da RU após um ano, também teve os piores resultados de RU (p<0,05). Quanta à avaliação da RF o grupo controle negativo (GCN, 215,14 N) apresentou os menores valores de resistência (p<0.05). Não foram encontradas diferenças estatisticamente significantes entre os demais grupos que estavam restaurados (p>0,05). Conclui-se que a associação entre resinas bulk-fill e adesivos simplificados, comparado aos sistemas convencionais não apresentaram diferenças quanto a resistência a fratura. Quanto a adaptação interna o sistema OBA/SF apresentou os piores resultados. Por último, inicialmente não houve diferença entre os adesivos quanto a RU. Após 1 ano os adesivos simplificados OBA e SBU tiveram os mesmos valores de RU que o sistema SBMP (Condiciona e lava de 3 passos). SBU não apresentou redução da RU. TBU apresentou redução da RU e os piores resultados, comparado aos demais sistemas adesivos.
The objective of this study was to evaluate internal adaptation (IA), bond strength (BS), and fracture resistance (FR) of the combination of high-viscosity bulk-fill resins and simplified adhesives in the restoration of endodontically-treated teeth. Four commercial restoration systems were evaluated, which were the control group (CG) in which Scotchbond Multi-Purpose + Filtek Z350XT (3M/ESPE) was used, (SBU/FBF) Single Bond Universal + Filtek Bulk-fill (3M/ESPE); (OBA/SF) OptBond All-in-one + Sonic Fill (Kerr), and (TBU/TBF)Tetric-N- Bond Universal + Tetric-N-Ceram Bulk-Fill (Ivoclar/Vivadent). In 32 human pre-molars, the occlusal surface was flattened, standard class I cavities were created, and the teeth were treated endodontically. Irrigation was performed using 2.5% sodium hypochlorite (NaOCl) and 17% EDTA. After the fillings (AH Plus, Dentsply, De Trey, Konstanz, Germany) and cleaning of the pulp chamber with 99% ethanol, a thin layer of ionoseal resin-modified glass iomer luting cement was applied (Voco, GmbH, Vuxhaven, Germany). The teeth were then divided into the experimental groups (n=8) and the restorations were performed. After 24 hours, the specimens were sectioned in the middle and the halves obtained were polished, and replicas were made in epoxy resin to evaluate IA using scanning electron microscopy. In 40 human molar thirds, a cut was made to expose the deep dentin. After standardization of the smear layer (file # 600), the tissue was treated with 2.5% NaOCl for 30 min and 17% EDTA for 3 min. It was then impregnated with AH Plus cement, which was in contact with the dentin for 5 min. Finally, the samples were cleaned with 99% ethanol. The specimens were randomly divided into the four experimental groups (n=10). After the application of the adhesive system, a block was made with the respective resin. After 24 hours the specimens were sectioned, and the microtraction test was applied. The assay was performed in two stages: after 24 hours and after 1 year of storage in distilled water. In 50 human premolars, endodontic treatment was performed as previously described. In addition to the experimental groups, a negative control (n=10) consisting of endodontically treated teeth without restoration was also evaluated. The FR test was performed using the universal testing machine. The data were evaluated using the ANOVA test and, if necessary, Tukey’s test, with a significance level of 5%. In the case of AI, the highest percentage of GAPs was formed for the SonicFill resin, and there were no statistical differences between the other resins studied (p>0.05). After 24 hours, there were no statistically significant differences in μTBS between the adhesive systems studied (p>0.05). However, after 1 year of storage, just the Single Bond Universal did not presented reduccion in μTBS and were not significant different from the results obtained after 24 hours (p<0.05). The simplified adhesives OBA and SBU showed similar μTBS values than the 3 step etch- and-rinse adhesive system SBMP (p>0,05). As for the FR assessment, the negative control group (NCG, 215.14 N) exhibited the lowest resistance values (p<0.05). No statistically significant differences were found between the other groups that were restored (p>0.05). It was concluded that the association between bulk-fill resins and universal adhesives did not differ in fracture resistance when compared to conventional systems. When internal adaptation was considered, the OBA/SF system exhibited the worst results. Finally, after 24 hours there were no difference in μTBS values between the adhesives systems studied. After one year the simplified adhesives OBA and SBU showed similar μTBS values than the 3 step etch-and-rinse adhesive system SBMP. SBU did not presented μTBS reduction and TBU presented the worst results between the adhesive systems studied.
The objective of this study was to evaluate internal adaptation (IA), bond strength (BS), and fracture resistance (FR) of the combination of high-viscosity bulk-fill resins and simplified adhesives in the restoration of endodontically-treated teeth. Four commercial restoration systems were evaluated, which were the control group (CG) in which Scotchbond Multi-Purpose + Filtek Z350XT (3M/ESPE) was used, (SBU/FBF) Single Bond Universal + Filtek Bulk-fill (3M/ESPE); (OBA/SF) OptBond All-in-one + Sonic Fill (Kerr), and (TBU/TBF)Tetric-N- Bond Universal + Tetric-N-Ceram Bulk-Fill (Ivoclar/Vivadent). In 32 human pre-molars, the occlusal surface was flattened, standard class I cavities were created, and the teeth were treated endodontically. Irrigation was performed using 2.5% sodium hypochlorite (NaOCl) and 17% EDTA. After the fillings (AH Plus, Dentsply, De Trey, Konstanz, Germany) and cleaning of the pulp chamber with 99% ethanol, a thin layer of ionoseal resin-modified glass iomer luting cement was applied (Voco, GmbH, Vuxhaven, Germany). The teeth were then divided into the experimental groups (n=8) and the restorations were performed. After 24 hours, the specimens were sectioned in the middle and the halves obtained were polished, and replicas were made in epoxy resin to evaluate IA using scanning electron microscopy. In 40 human molar thirds, a cut was made to expose the deep dentin. After standardization of the smear layer (file # 600), the tissue was treated with 2.5% NaOCl for 30 min and 17% EDTA for 3 min. It was then impregnated with AH Plus cement, which was in contact with the dentin for 5 min. Finally, the samples were cleaned with 99% ethanol. The specimens were randomly divided into the four experimental groups (n=10). After the application of the adhesive system, a block was made with the respective resin. After 24 hours the specimens were sectioned, and the microtraction test was applied. The assay was performed in two stages: after 24 hours and after 1 year of storage in distilled water. In 50 human premolars, endodontic treatment was performed as previously described. In addition to the experimental groups, a negative control (n=10) consisting of endodontically treated teeth without restoration was also evaluated. The FR test was performed using the universal testing machine. The data were evaluated using the ANOVA test and, if necessary, Tukey’s test, with a significance level of 5%. In the case of AI, the highest percentage of GAPs was formed for the SonicFill resin, and there were no statistical differences between the other resins studied (p>0.05). After 24 hours, there were no statistically significant differences in μTBS between the adhesive systems studied (p>0.05). However, after 1 year of storage, just the Single Bond Universal did not presented reduccion in μTBS and were not significant different from the results obtained after 24 hours (p<0.05). The simplified adhesives OBA and SBU showed similar μTBS values than the 3 step etch- and-rinse adhesive system SBMP (p>0,05). As for the FR assessment, the negative control group (NCG, 215.14 N) exhibited the lowest resistance values (p<0.05). No statistically significant differences were found between the other groups that were restored (p>0.05). It was concluded that the association between bulk-fill resins and universal adhesives did not differ in fracture resistance when compared to conventional systems. When internal adaptation was considered, the OBA/SF system exhibited the worst results. Finally, after 24 hours there were no difference in μTBS values between the adhesives systems studied. After one year the simplified adhesives OBA and SBU showed similar μTBS values than the 3 step etch-and-rinse adhesive system SBMP. SBU did not presented μTBS reduction and TBU presented the worst results between the adhesive systems studied.
Descrição
Palavras-chave
Adesivos dentinários, Endodontia, Restauração dentária permanente, Dentina, Dentin-bonding agents, Endodontics, Dental restoration, permanent, Dentin