Related Experiment Video
Updated: Dec 9, 2025
09:06
Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
Published on: July 3, 2020
7.6K
In vitro performance of 2-step, total etch adhesives modified by thiourethane additives
International Journal of Adhesion & Adhesives
|September 9, 2020
Summary
Thio-urethane (TU) oligomers improved conversion in dental adhesives but reduced mechanical properties after water storage. Bond strength remained unaffected at 24 hours and 6 months, indicating TU’s potential despite mechanical drawbacks.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Thio-urethane (TU) oligomers enhance mechanical properties in dental composites and cements.
- Investigating TU's potential in dental adhesives is crucial for improved material performance.
Purpose of the Study:
- To evaluate the effects of incorporating thio-urethane (TU) oligomers into dental adhesive matrices and as filler functionalization.
- To analyze the impact of TU on polymerization conversion and mechanical properties of experimental dental adhesives.
Main Methods:
- Experimental adhesives were formulated with BisGMA/HEMA, TU oligomers (matrix or filler functionalization), and methacrylate-functionalized fillers.
- Mechanical properties (flexural, microtensile bond strength), polymerization kinetics, water sorption/solubility, and viscosity were assessed.
- Statistical analysis included one-way ANOVA and Tukey post-hoc tests.
Main Results:
- TU addition to the matrix increased monomer conversion but decreased yield strength and flexural modulus after water storage.
- Polymerization rate (Rpmax) varied, with some TU-containing groups showing lower rates.
- Microtensile bond strength and water sorption/solubility remained unaffected by TU incorporation.
Conclusions:
- Incorporating TU into the adhesive matrix enhances monomer conversion but compromises mechanical properties post-water storage.
- Despite reduced mechanical strength, TU did not negatively impact the bond strength of dental adhesives at 24 hours or 6 months.
