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Related Experiment Video

Updated: Dec 9, 2025

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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In vitro performance of 2-step, total etch adhesives modified by thiourethane additives.

J Puppin-Rontani, A P P Fugolin, A R Costa

    International Journal of Adhesion & Adhesives
    |September 9, 2020
    PubMed
    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.

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    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.
    Keywords:
    Dental adhesivesMechanical properties of adhesivesMicro-tensileThio-urethane

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  • 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.