Traditional cold layering composite techniques can have limitations in the aesthetic rehabilitation of advanced tooth wear, with potentially high maintenance/failure rates and compromised aesthetics. This article explores advances in materials and clinical techniques involving monolithic ceramics and direct monolithic composites. These restorations satisfy the most aesthetically demanding patient, providing good to excellent aesthetics and long-term predictability.
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Load-bearing capacity of screw-retained fixed dental prostheses made of monolithic zirconia on different abutment designs and abutment-free implant connection.
J Dent
January 2025
Senior Research and Teaching Assistant, Clinic of Reconstructive Dentistry, Center for Dental Medicine, University of Zurich, Plattenstrasse 11, Zurich 8032, Switzerland. Electronic address:
Objectives: A new abutment-free implant connection allows for direct screwing of FDPs on implants to avoid complications caused by cement rests or screw loosening, which may affect to screw torque and load distribution. The objective of this study was to test the initial (Fi) and final failure (Ff) loads and torque changes of abutment-free monolithic zirconia CAD-CAM fixed dental prostheses (FDPs) compared to titanium FDPs on different abutment designs.
Methods: Three-unit screw-retained FDPs (n = 50) on two implants (n = 100) were divided into groups (n = 10) based on the implant-abutment connection and material of the supra-structure: (1) abutment-free monolithic CAD-CAM zirconia FDP (Abut-free-Zr), (2) abutment-free veneered titanium FDPs (Abut-free-Ti), (3) monolithic zirconia FDPs with titanium base abutments (Zr-Ti-Base), (4) monolithic zirconia FDPs on multi-unit abutments (Zr-MU), (5) veneered titanium FDP on multi-unit abutments (Ti-MU).
Highly Efficient Monolithic Perovskite/TOPCon Silicon Tandem Solar Cells Enabled by "Halide Locking".
Adv Mater
January 2025
Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
Perovskite/silicon tandem solar cells (TSCs) are promising candidates for commercialization due to their outstanding power conversion efficiencies (PCEs). However, controlling the crystallization process and alleviating the phases/composition inhomogeneity represent a considerable challenge for perovskite layers grown on rough silicon substrates, ultimately limiting the efficiency and stability of TSC. Here, this study reports a "halide locking" strategy that simultaneously modulates the nucleation and crystal growth process of wide bandgap perovskites by introducing a multifunctional ammonium salt, thioacetylacetamide hydrochloride (TAACl), to bind with all types of cations and anions in the mixed halide perovskite precursor.
View Article and Find Full Text PDFGaAs nano-ridge laser diodes fully fabricated in a 300-mm CMOS pilot line.
Nature
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imec, Leuven, Belgium.
Silicon photonics is a rapidly developing technology that promises to revolutionize the way we communicate, compute and sense the world. However, the lack of highly scalable, native complementary metal-oxide-semiconductor (CMOS)-integrated light sources is one of the main factors hampering its widespread adoption. Despite considerable progress in hybrid and heterogeneous integration of III-V light sources on silicon, monolithic integration by direct epitaxy of III-V materials remains the pinnacle of cost-effective on-chip light sources.
View Article and Find Full Text PDFFully 4D-Printed Near-Infrared-Actuated Lab-on-Valve Solid-Phase Extraction Devices.
Anal Chem
January 2025
Department of Chemistry, National Chung Hsing University, Taichung City 402202, Taiwan, ROC.
Four-dimensional printing (4DP) technologies can expand the functionality of stimuli-responsive devices to enable the integration of multiple stimuli-responsive parts into a compact device. Herein, we used digital light processing three-dimensional printing technique, flexible photocurable resins, and photocurable resins of the temperature-responsive hydrogels comprising -isopropylacrylamide (NIPAM), ,'-methylenebis(acrylamide) (MBA), and graphene for 4DP of a lab-on-valve (LOV) solid-phase extraction (SPE) device. This device featured flow manifolds and a monolithic packing connected by four near-infrared (NIR)-actuated temperature-responsive switching valves composed of a poly(NIPAM/MBA) (PNM) ball pushing a flexible membrane.
View Article and Find Full Text PDFArchitecting Multi-Level Structures and Regulating Hydrophilicity of Covalent Organic Framework Aerogels for Optimizing Mass Transport Capacity.
Small
December 2024
School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, 225002, P. R. China.
Architecting hierarchical structures in monolithic covalent organic frameworks (COFs) is vital for the applications of COFs in mass transport fields. The MXene-coated bilayer aerogels containing β-keto-enamine COF (MX-TpX-COF) with different chain lengths of aromatic linkers are constructed for the study. The directional freezing method endowed the COF part and MXene coating with aligned channels, and the small pores mainly exist in the former, while the larger ones in the latter.
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