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Enhancing bioactivity and stability of polymer-based materialtissue interface through coupling multiscale interfacial interactions with atomic-thin TiO2 nanosheets

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Nano Research 2023年第4期16卷 5247-5255页

作者： Rongchen Xu Xiaodan Mu Zunhan Hu Chongzhi Jia Zhenyu Yang Zhongliang Yang Yiping Fan Xiaoyu Wang Yuefeng Wu Xiaotong Lu Jihua Chen Guolei Xiang Hongbo Li Department of Stomatology The First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Stomatology The Third Medical CenterChinese PLA General HospitalBeijing 100039China Department of Stomatology Kunming Medical UniversityKunming 650500China National Clinical Research Center for Oral Diseases&Shaanxi Key Laboratory of Stomatology Department of ProsthodonticsSchool of StomatologyThe Fourth Military Medical UniversityXi’an 710032China Department of Stomatology The Strategic Support Force Medical CenterBeijing 100101China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

Stable and bioactive material-tissue interface(MTF)basically determines the clinical applications of biomaterials in wound healing,sustained drug release,and tissue engineering.Although many inorganic nanomaterials have been widely explored to enhance the stability and bioactivity of polymer-based biomaterials,most are still restricted by their stability and biocompatibility.Here we demonstrate the enhanced bioactivity and stability of polymer-matrix bio-composite through coupling multiscale material-tissue interfacial interactions with atomically thin TiO_(2)nanosheets.resin modified with TiO_(2)nanosheets displays improved mechanical properties,hydrophilicity,and stability.Also,we confirm that this resin can effectively stimulate the adhesion,proliferation,and differentiation into osteogenic and odontogenic lineages of human dental pulp stem cells using in vitro cell-resin interface model.TiO_(2)nanosheets can also enhance the interaction between demineralized dentinal collagen and resin.Our results suggest an approach to effectively up-regulate the stability and bioactivity of MTFs by designing biocompatible materials at the sub-nanoscale.

关键词： material-tissue interface TiO_(2)nanosheets pulpo-dentinal complex biomaterial resin composite

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Damage and Fatigue Failure of Conventional and Bulk-Filled resin composites

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Open Journal of Stomatology 2022年第2期12卷 62-76页

作者： Rana Alkattan Subir Banerji Sanjukta Deb Centre for Oral Clinical and Translational Sciences Faculty of Dentistry Oral and Craniofacial Sciences King’s College London London United Kingdom Department of Restorative Dental Science King Saud Bin Abdulaziz University for Health Sciences Riyadh Saudi Arabia Department of Prosthodontics University of Melbourne Melbourne Australia

Objectives: resin-based composites are the most widely used dental restorative materials. Bulk-fill resin composites are of rising interest as they can be clinically applied in thicker increments compared to conventional composites. The purpose of the study was to evaluate the flexural fatigue strength of a conventional and bulk-filled resin composite placed incrementally or non-incrementally. Methods: resin composite specimens were fabricated using either a conventional (Brilliant EverGlow?) or a bulk-fill (Fill-Up!TM) resin composite by either non-incremental filling (2 × 2 × 25 mm3) or in increments of (1 × 2 × 25 mm3). Specimens were stored in distilled water for 24 h or thermocycled for 5000 cycles. The static flexural strength (σ), flexural fatigue limit (FFL) after 105 cycles and post-fatigue flexural strength (PFσ) were measured. Data were analyzed using ANOVA, with a post-hoc Tukey’s test to compare mean FFL (p σ and PFσ compared to conventional composites regardless of incremental cure or thermocycling (p σ and FFL for conventional composites but not bulk-filled composites. There was no significant difference in PFσ compared to σ after 24 h storage, but a significant increase in PFσ after thermocycling (p composite rather than incremental placement had a greater effect on flexural strength, suggesting that operator placement technique had less influence than material selection. Thermocycling in combination with cyclic loading caused a strengthening effect in the composites, likely due to the absorption and dissipation of stresses, thereby enhancing resistance to fracture.

关键词： Cyclic Fatigue Flexural Fatigue Limit Flexural Strength Bulk-Fill resin composite Incremental Layering

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