Abstract
Objectives: To evaluate the benefits of a novel dentin-bonding primer, namely, isocyanate-terminated urethane methacrylate precursor (UMP), which can form covalent bonds with demineralized dentin collagen. Methods: The synthesized and purified UMP monomer was characterized and tested its effects on the degree of conversion (DC) and wettability of an acetone-based dental adhesive. Then UMP primers of different concentrations were formulated and used to prepare adhesive specimens, which were compared with solvent-treated groups. Primer-treated specimens with and without aging were also compared. To evaluate the bonding interface, microtensile strength tests, nano-indentation tests and nanoleakage- eavaluation were performed using a field-emission scanning electron microscope and nano-indenter. Data were analyzed using SPSS 20.0 software with significance set at α = 0.05 using one-way analysis of variance (ANOVA) and two-way ANOVA to characterize the effects of the primer. Results: Treatment with the UMP primer promoted the DC and wettability of the adhesive on the demineralized dentin surface (P < 0.05); it also increased the bond strength of the aged dentin bonding interface (P < 0.05). Nanoleakage was reduced; the bonding interface became more stable, and the continuity and strength of the hybrid layer improved (P < 0.05) following UMP treatment. The application of 5 mM UMP as a primer for dentin bonding could lead to a stable bonding interface and long-lasting bonding effects. Significance: The use of 5 mM UMP primer developed in this study could improve dentin bonding durability and has excellent clinical application prospects.
Original language | English (US) |
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Pages (from-to) | 455-462 |
Number of pages | 8 |
Journal | Dental Materials |
Volume | 39 |
Issue number | 5 |
DOIs | |
State | Published - May 2023 |
Keywords
- Adhesive
- Dentin
- Durability
- Hybrid layer
- Isocyanate
ASJC Scopus subject areas
- General Materials Science
- General Dentistry
- Mechanics of Materials