Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis
The presence of porosities at the dentin/adhesive interface has been observed with the use of new generation dentin bonding systems. These porosities tend to contradict the concept that etching and hybridization processes occur equally and simultaneously. Therefore, the aim of this study was to eval...
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| Format: | Article |
| Language: | English |
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University of São Paulo
2009-01-01
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| Series: | Journal of Applied Oral Science |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572009000700005 |
| _version_ | 1818560603841626112 |
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| author | Ana Paula Martini Rodolfo Bruniera Anchieta Eduardo Passos Rocha Amilcar Chagas Freitas Junior Erika Oliveira de Almeida Renato Herman Sundfeld Marco Antonio Luersen |
| author_facet | Ana Paula Martini Rodolfo Bruniera Anchieta Eduardo Passos Rocha Amilcar Chagas Freitas Junior Erika Oliveira de Almeida Renato Herman Sundfeld Marco Antonio Luersen |
| author_sort | Ana Paula Martini |
| collection | DOAJ |
| description | The presence of porosities at the dentin/adhesive interface has been observed with the use of new generation dentin bonding systems. These porosities tend to contradict the concept that etching and hybridization processes occur equally and simultaneously. Therefore, the aim of this study was to evaluate the micromechanical behavior of the hybrid layer (HL) with voids based on a self-etching adhesive system using 3-D finite element (FE) analysis. MATERIAL AND METHODS: Three FE models (Mr) were built: Mr, dentin specimen (41x41x82 μm) with a regular and perfect (i.e. pore-free) HL based on a self-etching adhesive system, restored with composite resin; Mp, similar to M, but containing 25% (v/v) voids in the HL; Mpp, similar to Mr, but containing 50% (v/v) voids in the HL. A tensile load (0.03N) was applied on top of the composite resin. The stress field was obtained by using Ansys Workbench 10.0. The nodes of the base of the specimen were constrained in the x, y and z axes. The maximum principal stress (σmax) was obtained for all structures at the dentin/adhesive interface. RESULTS: The Mpp showed the highest peak of σmax in the HL (32.2 MPa), followed by Mp (30 MPa) and Mr (28.4 MPa). The stress concentration in the peritubular dentin was high in all models (120 MPa). All other structures positioned far from voids showed similar increase of stress. CONCLUSION: Voids incorporated into the HL raised the σmax in this region by 13.5%. This behavior might be responsible for lower bond strengths of self-etching and single-bottle adhesives, as reported in the literature. |
| first_indexed | 2024-12-14T00:40:25Z |
| format | Article |
| id | doaj.art-485523a6529243c6955533ad0f4a925a |
| institution | Directory Open Access Journal |
| issn | 1678-7757 1678-7765 |
| language | English |
| last_indexed | 2024-12-14T00:40:25Z |
| publishDate | 2009-01-01 |
| publisher | University of São Paulo |
| record_format | Article |
| series | Journal of Applied Oral Science |
| spelling | doaj.art-485523a6529243c6955533ad0f4a925a2022-12-21T23:24:24ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652009-01-0117spe192610.1590/S1678-77572009000700005Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysisAna Paula MartiniRodolfo Bruniera AnchietaEduardo Passos RochaAmilcar Chagas Freitas JuniorErika Oliveira de AlmeidaRenato Herman SundfeldMarco Antonio LuersenThe presence of porosities at the dentin/adhesive interface has been observed with the use of new generation dentin bonding systems. These porosities tend to contradict the concept that etching and hybridization processes occur equally and simultaneously. Therefore, the aim of this study was to evaluate the micromechanical behavior of the hybrid layer (HL) with voids based on a self-etching adhesive system using 3-D finite element (FE) analysis. MATERIAL AND METHODS: Three FE models (Mr) were built: Mr, dentin specimen (41x41x82 μm) with a regular and perfect (i.e. pore-free) HL based on a self-etching adhesive system, restored with composite resin; Mp, similar to M, but containing 25% (v/v) voids in the HL; Mpp, similar to Mr, but containing 50% (v/v) voids in the HL. A tensile load (0.03N) was applied on top of the composite resin. The stress field was obtained by using Ansys Workbench 10.0. The nodes of the base of the specimen were constrained in the x, y and z axes. The maximum principal stress (σmax) was obtained for all structures at the dentin/adhesive interface. RESULTS: The Mpp showed the highest peak of σmax in the HL (32.2 MPa), followed by Mp (30 MPa) and Mr (28.4 MPa). The stress concentration in the peritubular dentin was high in all models (120 MPa). All other structures positioned far from voids showed similar increase of stress. CONCLUSION: Voids incorporated into the HL raised the σmax in this region by 13.5%. This behavior might be responsible for lower bond strengths of self-etching and single-bottle adhesives, as reported in the literature.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572009000700005Hybrid layerVoidsDentinFinite element analysis |
| spellingShingle | Ana Paula Martini Rodolfo Bruniera Anchieta Eduardo Passos Rocha Amilcar Chagas Freitas Junior Erika Oliveira de Almeida Renato Herman Sundfeld Marco Antonio Luersen Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis Journal of Applied Oral Science Hybrid layer Voids Dentin Finite element analysis |
| title | Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis |
| title_full | Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis |
| title_fullStr | Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis |
| title_full_unstemmed | Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis |
| title_short | Influence of voids in the hybrid layer based on self-etching adhesive systems: a 3-D FE analysis |
| title_sort | influence of voids in the hybrid layer based on self etching adhesive systems a 3 d fe analysis |
| topic | Hybrid layer Voids Dentin Finite element analysis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572009000700005 |
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