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000796605.pdf: 2231117 bytes, checksum: 2cb8d762ad76e855d47d13daf8e4e4f2 (MD5) === O objetivo deste estudo foi avaliar a citotoxicidade de cimentos resinosos quando aplicados sobre cultura de células odontoblastóides (MDPC-23) e pulpares humanas (HDPC). Os seguintes grupos foram formados: G1 - controle (sem tratamento); G2 - Rely X Luting 2; G3 - Rely X U200; G4 - Rely X ARC. Corpos de prova padronizados, preparados com os cimentos, foram imersos em 1 mL de meio de cultura (DMEM) por 24hs para obtenção dos extratos (DMEM + componentes liberados dos cimentos). Após aplicar os extratos sobre as células por 24hs, a viabilidade (MTT assay) e tipo de morte celular (Anexina/PI), bem como a morfologia das células (MEV) foram avaliados. Os dados obtidos foram submetidos à análise estatística de Kruskal-Wallis complementada por Mann-Whitney (α=5%). A análise química dos extratos foi realizada por cromatografia liquida de alta performance (HPLC). Nos grupos G2, G3 e G4, observou-se redução de 95,8%, 31,5% e 22,7% na viabilidade das células MDPC-23, respectivamente. Redução de 89,4% para G2 e aumento em 11,3% e 29% para G3 e G4, respectivamente, foram observados para as HDPCs. Para as células MDPC-23, redução significativa de viabilidade ocorreu em G2 e G3 quando comparado à G1; todavia, para as HDPCs esta redução foi observada apenas em G2 (p<0,05). Para ambas as culturas usadas no estudo, ocorreu 100% de morte celular por necrose apenas em G2, onde o pH do extrato era ácido. Em G3, onde uma pequena quantidade de TEGDMA foi detectado no extrato, houve reduzida morte celular por necrose e discreta alteração morfológica nas células. Todavia, nenhum dano celular ocorreu em G4. De maneira geral, a células MDPC-23 são mais sensíveis do que as HDPCs. Concluiu-se que apenas o cimento Rely X Luting 2 causou intenso efeito citotóxico para ambas culturas de células pulpares usadas neste estudo. Rely X U200 apresentou discreta citotoxicidade, enquanto o cimento Rely X ARC não foi tóxico para as células pulpares... === The aim of this study was to evaluate the cytotoxicity of luting cements on cultured MDPC-23 odontoblast-like cells and human dental pulp cells (HDPCs). The following groups were formed: G1 - control (no treatment), G2 - Rely X Luting 2, G3 - Rely X U200; G4 - Rely X ARC. Standard round specimens prepared with resin cements were immersed in 1 ml of culture medium (DMEM) for 24 hours to obtain the extract (DMEM + components released from the cement). After applying the extracts to the cells for 24 hours, the viability (MTT assay) and type of cell death (Annexin/PI) as well as cell morphology (SEM) were evaluated. The data obtained was submitted to Kruskal-Wallis statistical analysis complemented by Mann-Whitney test (α=5%). The chemical analysis of the extracts was performed by high performance liquid chromatography (HPLC). In G2, G3 and G4, there was a reduction of 95.8 %, 31.5 % and 22.7 % in the MDPC-23 cells viability, respectively. A reduction of 89.4 % for G2, as well as an increase of 11.3 % and 29% for G3 and G4 was observed for the HDPCs, respectively. Significant reduction of MDPC-23 viability occurred for G2 and G3 compared to G1. However, for HDPCs this reduction was only observed in G2 (p<0.05). For both cell cultures used in this study, there was 10 % of cell death by necrosis only in G2, in which the pH of the extract was acid. In G3, where a small amount of TEGDMA was detected in the extracts, there was reduced cell death by necrosis and a discrete morphological alteration in cells. No cellular damage occurred in G4. In general, the MDPC-23 cells are more sensitive than HDPCs against the toxicity of resin cement components. It was found that only the Rely X Luting cement caused intense cytotoxic effect for both pulp cell cultures used in this study. Rely X U200 showed mild cytotoxicity, whereas the cement Rely X ARC was not toxic to the pulp cells.
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