Association of solvents improves selected properties of experimental dental adhesives

• Main Authors: Francisbênia Alves Silvestre (Author), Vitaliano Gomes de Araújo Neto (Author), Marcelo Giannini (Author), Tainah Oliveira Rifane (Author), Karen Evellin Moura Cordeiro (Author), Samara Tabata Cavalcante Braga Medeiros (Author), Diego Lomonaco (Author), Madiana Magalhães Moreira (Author), Adyson Herbert Correia Alves (Author), Victor Pinheiro Feitosa (Author)
• Format: Book
• Published: Sociedade Brasileira de Pesquisa Odontológica, 2022-07-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 1807-3107; 10.1590/1807-3107bor-2022.vol36.0093
• Keywords: Solvents; Dental Bonding; Ethanol; Dentistry; RK1-715
• Source: Brazilian Oral Research, Vol 36 (2022)

Abstract: The aim of the study was to evaluate how the association of solvents (tetrahydrofuran [THF], dimethyl sulfoxide [DMSO], ethanol [ET] or acetone [ACT]) with experimental dental adhesives affects selected properties of experimental dental adhesives and dentin bond durability. Six adhesive combinations were prepared containing: 30 % ET, 30 % ACT, 30 % THF, 28 % ET + 2 % DMSO (ET+DMSO), 15 % ethanol + 15 % THF (ET+THF), or 28 % THF + 2 % DMSO (THF+DMSO). Thirty-six molars (n = 6) were cut to expose the coronary dentin, and were randomly divided according to the adhesives. They were restored, and then cut into resindentin sticks (1 mm²), and stored in distilled water for 24 h or 6 months, until conducting the microtensile bond strength and nanoleakage tests. Other experiments performed with adhesives included viscosity assessment using a rheometer, and degree of conversion using Fourier-transform infrared spectroscopy (FTIR). The data were analyzed statistically using two-way ANOVA and Tukey's test (p < 0.05). The adhesive formulated exclusively with THF showed the highest viscosity, followed by ET+THF, which obtained the highest degree of conversion compared to ET, and THF alone. ET+DMSO obtained the highest 24-h and aged bond strengths (p < 0.05). ET+THF increased the nanoleakage slightly after 6 months, but attained the only gap-free adhesive interface among all the groups. The combination of alternative solvents, particularly THF, with conventional ones (ET) has improved chemical properties, and the dentin bonding of experimental simplified adhesives.