Dental adhesives and strategies for displacement of water/solvents from collagen fibrils
| Autor: | Ana K. Bedran-Russo, Gláucia Maria Bovi Ambrosano, Giselle Maria Marchi, A.A. Leme, Thaiane Rodrigues Aguiar, Larissa Sgarbosa de Araújo Matuda |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Evaporation Dental Cements Young's modulus 02 engineering and technology Dental bonding Composite Resins Article 03 medical and health sciences symbols.namesake 0302 clinical medicine Dental cement Tensile Strength Materials Testing Ultimate tensile strength Dentin medicine Humans General Materials Science Composite material General Dentistry Dental Bonding Water food and beverages 030206 dentistry 021001 nanoscience & nanotechnology Resin Cements medicine.anatomical_structure Mechanics of Materials Dentin-Bonding Agents Solvents symbols Collagen sense organs Adhesive 0210 nano-technology Displacement (fluid) |
| Zdroj: | Dental Materials. 32:723-731 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2016.03.009 |
| Popis: | To evaluate the influence of temperature of evaporation in adhesive systems with different solvents on the apparent modulus of elasticity and mass change of macro-hybrid layers modified by proanthocyanidins (PACs).Adhesive resin beams (A) from Single Bond Plus (SB), Excite (EX) and One Step Plus (OS) were prepared after solvent evaporation at 23°C or 40°C (n=12). Macro-hybrid layers (M) (n=12) were prepared using demineralized dentin beams sectioned from extracted human third molars. The demineralized dentin specimens were infiltrated with each one of the three adhesive systems at 23°C or 40°C; with or without prior dentin treatment with PACs for 10min. The apparent modulus of elasticity (E) and mass change (Wmc, %) of adhesives beams and resin-infiltrated specimens were assessed in dry and wet conditions after immersion in water (24h, 1, 3 and 6 months). The E was statistically analyzed by Tukey-Kramer test and the Wmc, % by Kruskal Wallis, and Dunn (α=0.05).Solvent evaporation at 40°C resulted in higher E values for adhesive resin beams at all storage conditions, regardless of the adhesive system (p0.05). Increased mass loss (3 months: -0.01%; 6 months: -0.05%) was observed in One Step resin beams (p≤0.05). In the macro-hybrid layer models the pretreatment with PACs along with solvent evaporation at 40°C increased E and decreased the Wmc, % (3 months: -2.5; 6 months: 2.75%) for adhesives evaluated over time (p0.05). No significant differences in ratio (resin/dentin) were found for the macro-hybrid layers (p0.05).Improved solvent evaporation at higher temperature, and increased collagen cross-linking induced by PACs, enhanced the mechanical properties resulting in highly stable macro-hybrid layers over 6 months storage. |
| Databáze: | OpenAIRE |
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