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Exploring morphometric transformations in temperature-sensitive NiTi instruments alongside real-time intracanal temperature dynamics.
Int Endod J
September 2024
Department of Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates.
Aim: This study was twofold: (i) it aimed to investigate the morphometric changes of three temperature-sensitive nickel-titanium (NiTi) instruments at different temperatures, and (ii) to conduct an in vivo real-time analysis of intracanal temperature changes.
Methods: Changes in the shape and length of XP-Endo Shaper, XP-Endo Finisher, and XP-Endo Finisher-R were evaluated in real time whilst heated in a temperature-controlled water bath from 22 to 45°C. Instruments were fixed to a laminated water-resistant 1 mm graph paper attached to a stone block.
Engineering of Chain Rigidity and Hydrogen Bond Cross-Linking toward Ultra-Strong, Healable, Recyclable, and Water-Resistant Elastomers.
Adv Mater
May 2023
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
High-performance elastomers have gained significant interest because of their wide applications in industry and our daily life. However, it remains a great challenge to fabricate elastomers simultaneously integrating ultra-high mechanical strength, toughness, and excellent healing and recycling capacities. In this study, ultra-strong, healable, and recyclable elastomers are fabricated by dynamically cross-linking copolymers composed of rigid polyimide (PI) segments and soft poly(urea-urethane) (PUU) segments with hydrogen bonds.
View Article and Find Full Text PDFExperimental Study on the Effect of Carbonation Reaction on the Properties of Imitation Site Soil.
Materials (Basel)
April 2022
School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China.
In this study, sodium methylsilicate and lime were selected to prepare the same proportion of Imitation Site Soil, and according to the principle of carbonation reaction of restoration materials, the effect of carbonation reaction on the performance of restoration soil of earthen sites was studied. The study has good significance for the conservation and restoration of earthen sites. The samples were cured with CO concentration and curing age as variables.
View Article and Find Full Text PDFRegulating the reactivity of black phosphorus via protective chemistry.
Sci Adv
November 2020
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
Rationally regulating the reactivity of molecules or functional groups is common in organic chemistry, both in laboratory and industry synthesis. This concept can be applied to inorganic nanomaterials, particularly two-dimensional black phosphorus (BP) nanosheets. The high reactivity of few-layer (even monolayer) BP is expected to be "shut down" when not required and to be resumed upon application.
View Article and Find Full Text PDFHydrogen bonds autonomously powered gelatin methacrylate hydrogels with super-elasticity, self-heal and underwater self-adhesion for sutureless skin and stomach surgery and E-skin.
Biomaterials
July 2018
Department of Plastic and Aesthetic Surgery, Nanfang Hospital of Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, Guangdong 510515, China; Department of Mechanical Engineering, Faculty of Engineerig, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; Institute of Burn Research, Southwest Hospital, Army Medical University, Chongqing, 400038, China. Electronic address:
Article Synopsis
- Researchers developed a GelMA-based double-network hydrogel using tannic acid to enhance its mechanical properties, making it suitable for biomedical use.
- The GelMA-TA hydrogels showed significant improvements in stress, compressive modulus, and elongation compared to the original GelMA hydrogels.
- In practical applications, the hydrogels effectively closed skin wounds and gastric incisions without sutures, promoting healing with minimal adhesion and showing potential as self-healing electronic skin when combined with carbon nanotubes.
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