Dental adhesives and strategies for displacement of water/solvents from collagen fibrils. Issue 6 (June 2016)

• Record Type: Journal Article
• Authors: Matuda, Larissa Sgarbosa de Araújo; Marchi, Giselle Maria; Aguiar, Thaiane Rodrigues; Leme, Ariene Arcas; Ambrosano, Gláucia M.B.; Bedran-Russo, Ana Karina
• Is Part Of: Dental materials. Volume 32:Issue 6(2016)
• Page Start: 723
• Page End: 731
• Publication Date: 2016-06
• Subjects: Dentin, Collagen cross-linkers -- Dental adhesive -- Temperature volatilization -- Apparent modulus of elasticity; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2016.03.009
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract: Objectives: 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). Methods: 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 10 min. The apparent modulus of elasticity ( E ) and mass change ( W mc, %) of adhesives beams and resin-infiltrated specimens were assessed in dry and wet conditions after immersion in water (24 h, 1, 3 and 6 months). The E was statistically analyzed by Tukey–Kramer test and the W mc, % by Kruskal Wallis, and Dunn ( α = 0.05). Results: Solvent evaporation at 40 °C resulted in higher E values for adhesive resin beams at all storage conditions, regardless of the adhesive system ( p < 0.05). 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 W mc, % (3 months: −2.5; 6 months: 2.75%) for adhesives evaluated over time ( p < 0.05). No significant differences in ratio (resin/dentin) were found for the macro-hybrid layers ( p > 0.05). Significance: 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.