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Gallo M, Abouelleil H, Chenal JM, Adrien J, Lachambre J, Colon P, Maire E. Polymerization shrinkage of resin-based composites for dental restorations: A digital volume correlation study. Dent Mater 2019; 35:1654-1664. [PMID: 31554599 DOI: 10.1016/j.dental.2019.08.116] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 07/24/2019] [Accepted: 08/31/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Resin-based composites are widely used in dental restorations; however, their volumetric shrinkage during polymerization leads to several issues that reduce the restoration survival rates. For overcoming this problem, a deep study of shrinkage phenomena is necessary. METHODS In this study, micro-tomography (μ-CT) is combined with digital volume correlation (DVC) to investigate the effect of several factors on the polymerization strain of dental composites in model cavities: the presence/absence of an adhesive, the use of transparent/blackened cavities, and irradiation times between 1 and 40s. RESULTS The results indicate that the presence of an adhesive at the interface between the cavity and composite does not reduce the total strain but instead limits it to a preferential direction. In addition, regardless of the conditions, the main strain is generated along the axis parallel to the polymerization irradiation (the vertical axis). Finally, the total strain appears to occur in the first 5s of irradiation, with no further evolution observed for longer irradiation times. SIGNIFICANCE This work provides new insight into resin-based composite shrinkage and demonstrates the benefit of coupling DVC and μ-CT to better understand the degradation mechanisms of these materials.
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Affiliation(s)
- Marta Gallo
- University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France
| | - Hazem Abouelleil
- Laboratoire des Multimateriaux et Interfaces, UMR CNRS 5615, Universite Lyon 1, Villeurbanne, France
| | - Jean Marc Chenal
- University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France
| | - Jérôme Adrien
- University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France
| | - Joël Lachambre
- University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France
| | - Pierre Colon
- Laboratoire des Multimateriaux et Interfaces, UMR CNRS 5615, Universite Lyon 1, Villeurbanne, France; UFR d'odontologie, Université Paris Diderot, APHP, Hôpital Rothschild, Service d'odontologie, Paris, France
| | - Eric Maire
- University of Lyon, INSA de Lyon, MATEIS UMR CNRS 5510, Bât. Saint Exupery, 23 Av. Jean Capelle, F-69621 Villeurbanne, France.
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Vieira CED, Costa PG, Caldas SS, Tesser ME, Risso WE, Escarrone ALV, Primel EG, Bianchini A, Dos Reis Martinez CB. An integrated approach in subtropical agro-ecosystems: Active biomonitoring, environmental contaminants, bioaccumulation, and multiple biomarkers in fish. Sci Total Environ 2019; 666:508-524. [PMID: 30802666 DOI: 10.1016/j.scitotenv.2019.02.209] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Revised: 02/09/2019] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
Aquatic contamination in agricultural areas is a global problem, characterized by a complex mixture of organic and inorganic pollutants whose effects on biota are unpredictable and poorly investigated. In this context, in the present study, the Neotropical fish Prochilodus lineatus was confined in situ for 120 days in two sites with different levels of anthropic impact: 1) a fish hatchery station, within the State University of Londrina (reference site - REF) and 2) an agro-ecosystem area in one of the most productive regions of southern Brazil (experimental site - EXP). We evaluated multiple biomarkers at different levels of biological organization, such as biotransformation and antioxidant enzymes, oxidative damages, DNA damages and liver histopathology. We also evaluated the occurrence of 22 organochlorine pesticides (OCPs) and 6 trace metals in water and sediment; and 33 current-use pesticides (CUPs) in the water; besides the presence of OCPs in the liver and metals in different tissues of the confined fish. The chemical analysis confirmed that the two environments presented different levels of contamination. We verified a distribution gradient of data in the principal component analysis (PCA), separating the REF fish to one side and the fish at the agricultural area (EXP) to the other side. In general, the biomarker responses were more altered in fish from the EXP than fish from the hatchery station; and this fish presented a greater accumulation of endosulfan (an increase of 18× compared to basal value) and showed oxidative, genetic, and histological damage. Through the Biomarkers Response Index (BRI), we found that the EXP fish demonstrated a decrease in health status compared with the REF fish during the confinement time, due to their exposure to a higher concentration of contaminants. In conclusion, the use of multiple biomarkers at different response levels is an important tool for environmental monitoring.
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Affiliation(s)
- Carlos Eduardo Delfino Vieira
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná, Brazil.
| | - Patrícia Gomes Costa
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Av. Itália, km8, s/n, Rio Grande, Rio Grande do Sul, Brazil
| | - Sergiane Souza Caldas
- Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av. Itália, km 8, s/n, Rio Grande, Rio Grande do Sul, Brazil
| | - Maria Eduarda Tesser
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná, Brazil
| | - Wagner Ezequiel Risso
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná, Brazil
| | - Ana Laura Venquiaruti Escarrone
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Av. Itália, km8, s/n, Rio Grande, Rio Grande do Sul, Brazil
| | - Ednei Gilberto Primel
- Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av. Itália, km 8, s/n, Rio Grande, Rio Grande do Sul, Brazil
| | - Adalto Bianchini
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Av. Itália, km8, s/n, Rio Grande, Rio Grande do Sul, Brazil
| | - Cláudia Bueno Dos Reis Martinez
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná, Brazil
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Vieira CED, Costa PG, Cabrera LC, Primel EG, Fillmann G, Bianchini A, Bueno Dos Reis Martinez C. A comparative approach using biomarkers in feral and caged Neotropical fish: Implications for biomonitoring freshwater ecosystems in agricultural areas. Sci Total Environ 2017; 586:598-609. [PMID: 28215813 DOI: 10.1016/j.scitotenv.2017.02.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 01/13/2017] [Accepted: 02/03/2017] [Indexed: 06/06/2023]
Abstract
The aim of this study was to investigate the responses of biomarkers in feral and caged fish and the capacity of these biomarkers to discriminate contamination levels along a stream located in an agricultural area in Southern Brazil. Specimens of the Neotropical fish, Astyanax altiparanae, were confined for 168h in three lakes along the stream. Additionally, during the weeks of in situ exposure, wild specimens of this species were collected from the same sites. Biochemical biomarkers were analyzed, such as phase I biotransformation enzyme 7-ethoxyresorufin-O-deethylase (EROD) and phase II biotransformation enzyme glutathione S-transferase, and we also determined hepatic and branchial levels of non-protein thiols (NPSH), oxidative damage such as lipid peroxidation (LPO), and acetylcholinesterase (AChE) activity in muscle and brain. Genetic biomarkers such as DNA breaks (comet assay), frequency of micronuclei (MN) and erythrocytic nuclear abnormalities (ENA) were also examined. The results indicate that the most sensitive biomarkers for discriminating contamination levels are DNA breaks, LPO and AChE activity. Similar results were obtained for both caged and feral fish. The biomarkers that reflect the results of cumulative events, such as ENA, were more discriminative for chronically exposed specimens (feral fishes). Analyzing biomarkers using an integrated response index showed that both approaches (using feral and caged A. altiparanae) were effective for discriminating contamination levels along the stream, corroborating the results of chemical analyses for selected pesticides. Taken together, these results highlight the importance of biomarker selection and show that both approaches (caged and feral fish) are satisfactory for evaluating water quality in streams impacted by agricultural activities.
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Affiliation(s)
- Carlos Eduardo Delfino Vieira
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná 86057-970, Brazil
| | - Patrícia Gomes Costa
- Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul 96203-900, Brazil
| | - Liziara Costa Cabrera
- Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av Itália, km 8, s/n, Rio Grande, Rio Grande do Sul 96203-900, Brazil
| | - Ednei Gilberto Primel
- Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av Itália, km 8, s/n, Rio Grande, Rio Grande do Sul 96203-900, Brazil
| | - Gilberto Fillmann
- Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul 96203-900, Brazil
| | - Adalto Bianchini
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Av Itália, km8, s/n, Rio Grande, Rio Grande do Sul 96203-900, Brazil
| | - Claudia Bueno Dos Reis Martinez
- Departamento de Ciências Fisiológicas, Universidade Estadual de Londrina, Rod. Celso Garcia Cid, km 380, Londrina, Paraná 86057-970, Brazil.
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