The presence of residual endodontic sealer in the pulp chamber may cause discoloration of the dental crown and interfere with the adhesion of restorative materials. The aim of this study was to compare the efficacy of different solvents in removing residues of an epoxy resin-based sealer (AH Plus) from the dentin walls of the pulp chamber, by scanning electron microscopy (SEM). Forty-four bovine incisor dental crown fragments were treated with 17% EDTA and 2.5% NaOCl. Specimens received a coating of AH Plus and were left undisturbed for 5 min. Then, specimens were divided in four groups (n = 10) and cleaned with one of the following solutions: isopropyl alcohol, 95% ethanol, acetone solution, or amyl acetate solution. Negative controls (n = 2) did not receive AH Plus, while in positive controls (n = 2) the sealer was not removed. AH Plus removal was evaluated by SEM, and a score system was applied. Data were analyzed by Kruskal-Wallis and Dunn tests. None of the solutions tested was able to completely remove AH Plus from the dentin of the pulp chamber. Amyl acetate performed better than 95% ethanol and isopropyl alcohol (p < 0.05), but not better than acetone (p > 0.05) in removing the sealer from dentin. No significant differences were observed between acetone, 95% ethanol, and isopropyl alcohol (p > 0.05). It was concluded that amyl acetate and acetone may be good options for cleaning the pulp chamber after obturation with AH Plus.

Objetivos: O objetivo do estudo foi realizar uma análise de casos clínicos, ocorridos no período de 2010 a 2022, e as condutas terapêuticas e decisões estratégias tomadas nas situações de extrusão acidental da solução de hipoclorito de sódio durante o tratamento endodôntico e estabelecer um protocolo de tratamento eficaz, por meio de evidências clínicas. Métodos: O prontuário clínico de 72 pacientes atendidos com sinais e sintomas de extravasamento apical de solução de hipoclorito de sódio foram analisados, com atenção especial ao diagnóstico e as condutas terapêuticas e estratégias clínicas realizadas. Após a análises destes parâmetros, foram selecionados os principais critérios que colaboraram para a resolução clínica, por meio de evidências clínicas, e discutidos com vistas a estabelecer um protocolo clínico racional para a resolução deste infortúnio. Resultados: A sensação dolorosa imediata foi o sinal clínico mais relatado, com o subsequente aparecimento de edema local e equimose na região acometida. Os parâmetros de imediatamente colocar o paciente na posição sentado, aspirar o conteúdo do canal radicular, prescrever imediatamente a medicação com anti-histamínico, corticosteroide e furoato de mometasona, associado com fisioterapia local com compressa fria e posterior tratamento endodôntico compreenderam os itens que contribuíram para a resolução clínica. Conclusão: A dor imediata, edema facial e equimose compreendem os principais sinais e sintomas clínicos nos casos de extravasamento apical da solução de hipoclorito de sódio. As estratégias clínicas descritas no estudo contribuem para a breve resolução, suportados por evidências clínicas dos casos solucionados.

Objetivo: Avaliar o a influência da remoção de resíduos de dois cimentos à base de resina epóxi (SPL, Sealer Plus ou S26, Sealer 26), com etanol a 95% (ETA) ou xilol (XIL), na interface de adesão entre o sistema adesivo universal (SBU, Scotchbond Universal), utilizado na estratégia condiciona-e-lava, e o substrato dentinário da coroa dental, por meio da avaliação da resistência de união (RU), avaliada pelo teste de microcisalhamento, e análise do padrão de falha adesiva. Materiais e métodos: A face vestibular de quarenta coroas de dentes bovinos ex vivo foram preparadas e dividas e quatro grupos (n=10), de acordo com a composição química do cimento endodôntico (SPL ou S26) e protocolo de remoção dos resíduos (ETA ou XIL): SPL+ETA, SPL+XIL, S26+ETA e S26+XIL. Imediatamente após a impregnação da dentina e remoção dos resíduos do cimento, de acordo com o protocolos selecionado, a superfície dentinária foi condicionada com ácido fosfórico a 27% e aplicado o adesivo universal (SBU). Em seguida, 4 corpos de prova de resina composta foram fixados no local e, 24h após, submetidos ao teste de microcisalhamento e análise do padrão de fratura. Os dados de resistência de união foram analisados pelo teste de ANOVA a 2 critérios. Resultados:S26+ETA e S26+XIL demonstraram menores valores de RU em relação a SPL+XIL e S26+XIL (P < 0,05). Não houve diferença entre SPL+ETA e S26+S26 ou SPL+XIL e S26+S26 (P > 0,05). Conclusão: O xilol é o protocolo mais favorável para a remoção de resíduos do cimento à base de resina epóxi, independentemente da composição química do material, sobre a interface de adesão com o adesivo universal (SBU), utilizado na estratégia condiciona-e-lava.

Objective: To quantify the persistence of residues after endo dontic retreatment related to the root canal obturation technique (lateral compaction or single cone) previously performed and the solvent used (xylol or EndosolvR) in the cervical and root apical segment using digital radiograph. Materials and methods:Forty root canals were prepared using the F2 instrument and filled with gutta-percha and AH Plus, 20 canals using #25 point by lateral compaction and the other 20 using F2 point by single cone. The root canals were transversely sectioned, and two segments (cervical and apical) were obtained. Radiographs were taken from the segment in buccolingual and mesiodistal direction, as well as the area that was originally filled with the root canal obturation was measured using ImageJ. After the specimens were set on special devices, the obturations were removed using the rotary system and divided into four groups (n = 10): G1 -lateral compaction and xylol; G2 -lateral compaction and EndosolvR; G3 -single cone and xylol; and G4 -single cone and Endosolv-R. A new radiograph was taken and the area occupied by residues was measured. The persistence of residues was obtained from the obturation remaining in the root canal in percentage. The data were analyzed using Kruskal-Wallis test (p = 0.05).Results: There was no difference among the examined groups, regardless of the radicular segment or the radiograph direction (p > 0.05). Conclusion:The endodontic retreatment using xylol or EndosolvR in the obturations previously performed by lateral compaction or single cone technique presented similar persis tence of residues in the root canal, regardless of the radicular segment.

Objective: The purpose of this study was to evaluate the influence of the addition of 2% chlorhexidine digluconate (CHX) associated with 5% calcium chloride (CaCl 2 ) on antimicrobial activity, setting time, pH and calcium release of gray mineral trioxide aggregate (GMTA). Materials and Methods: GMTA powder was mixed with water, 2% CHX alone or 2% CHX combined with 5% CaCl 2 . Antimicrobial activity was determined against Enterococcus faecalis (ATCC 29212) strains by agar diffusion test. Data obtained were submitted to kruskal wallis tests. Analysis of the setting time was evaluated by American society for testing and materials C266-03 requirements. The pH and calcium release analysis were evaluated, in 24 h, 7, 14 and 28 days using pH meter equipment and atomic absorption spectrophotometer, respectively. Data obtained were analyzed by ANOVA, in 5% significance level. Results: Significant differences were seen (P < 0.01) among the zones of bacterial growth inhibition produced by 5% CaCl 2 + 2% CHX combination against E. faecalis when compared with water (P < 0.05). Regarding the setting time, that combination had the shortest setting time (P < 0.05). All associations were alkaline and released calcium. No statistical difference was observed between the experimental groups at the different periods of analysis (P > 0.05). Conclusion: Combination of 5% CaCl 2 + 2% CHX reduced the setting time and enhanced the antimicrobial activity of GMTA without changing the pH and calcium release.