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Synthesis, characterization, and aging resistance of the polyurethane dimethacrylate layer for dental restorations
Author(s) -
Guo Xiaowei,
Cheng Qiuli,
Wang Han,
Yu Gaigai,
Tian Zilu,
Shi Zuosen,
Cui Zhanchen,
Zhu Song
Publication year - 2020
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12674
Subject(s) - materials science , composite material , ultimate tensile strength , adhesive , thermal stability , bond strength , polyurethane , solubility , biocompatibility , dental bonding , composite number , layer (electronics) , chemical engineering , chemistry , organic chemistry , engineering , metallurgy
In this study, polyurethane dimethacrylate (PUDMA) was synthetized from different components and incorporated into a direct resin composite restoration system with the aim to buffer tooth–resin interfacial stresses and maintain the marginal adaptation. The tensile strength, elongation at fracture ( ε ), and thermal stability of the PUDMA layer were characterized, showing a tensile strength of 22 MPa, an ε of 112%, and a thermal decomposition temperature of about 282°C. In addition, the degree of conversion, water sorption/solubility, hydrophobicity, microtensile bond strength ( μ TBS), marginal leakage, and cytotoxicity in vitro were evaluated for the PUDMA layer. The data were analyzed using one‐way ANOVA , except for leakage depths (which were analyzed using the Wilcoxon paired‐rank test). The level of significance was set at 0.05. Compared with dental adhesives, PUDMA displayed a higher degree of conversion, lower water sorption/solubility, and improved hydrophobicity and biocompatibility in vitro . After thermocycling, the μ TBS of the restoration system containing PUDMA had increased compared with the μ TBS at 24 h. Restorations containing PUDMA showed lower leakage depths than those which did not contain PUDMA. In conclusion, because of its hydrophobic and elastic nature, the PUDMA layer, when used as an intermediate between tooth and resin restoratives, may buffer interfacial stresses, improve the stability and durability of the bonding interface, and reduce microleakage.