Water interaction and bond strength to dentin of dye -labelled adhesive as a function of the addition of rhodamine B

Author(s)

Wang, Linda ; Bim Junior, Odair ; de Oliveira Lopes, Adolfo Coelho ; Francisconi-Dos-Rios, Luciana Favaro ; Maenosono, Rafael Massunari ; Perlatti D'Alpino, Paulo Henrique ; Honorio, Heitor Marques ; Atta, Maria Teresa

• Document type: Journal article
• Source: Journal of Applied Oral Science; v. 24, n. 4, p. 317-324, JUL-AUG 2016.
• Web of Science Citations: 4

Abstract

Objective: This study investigated the effect of the fluorescent dye rhodamine B (RB) for interfacial micromorphology analysis of dental composite restorations on water sorption/solubility (WS/WSL) and microtensile bond strength to dentin (mu TBS) of a 3-step total etch and a 2-step self-etch adhesive system. Material and Methods: The adhesives Adper Scotchbond Multi-Purpose (MP) and Clearfil SE Bond (SE) were mixed with 0.1 ring/mL of RB. For the WS/WSL tests, cured resin disks (5.0 mnn in diameter x 0.8 nnm thick) were prepared and assigned into four groups (n=10): MP, MP-RB, SE, and SE RB. For mu TBS assessment, extracted human third molars (n=40) had the flat occlusal dentin prepared and assigned into the sanne experimental groups (n=10). After the bonding and restoration procedures, specimens were sectioned in rectangular beams, stored in water and tested after seven days or after 12 months. The failure mode of fractured specimens was qualitatively evaluated under optical microscope (x40). Data from WS/WSL and mu TBS were assessed by one-way and three-way ANOVA, respectively, and Tukey's test (alpha=5%). Results: RB increased the WSL of MP and SE. On the other hand, WS of both MP and SE was not affected by the addition of RB. No significance in pTBS between MP and MP-RB for seven days or one year was observed, whereas for SE a decrease in the mu TBS means occurred in both storage times. Conclusions: RB should be incorporated into non-sinnplified DBSs with caution, as it can interfere with their physical-mechanical properties, leading to a possible misinterpretation of bonded interface. (AU)

• FAPESP's process: 11/14971-2 - Evaluation of the effect of adding fluorescent agent (Rhodamine B) in non-simplified adhesive systems.
• Grantee: Odair Bim Júnior
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 12/13160-3 - Effect of addition of fluorescent agent (Rodhamine B) to no-simplified dentin bonding agents: analisys of physical-mechanical properties
• Grantee: Linda Wang
• Support Opportunities: Regular Research Grants