Cone beam computed tomography (CBCT) is increasingly seen in UK dental practices, but there is no published information regarding how it is used. The aim of the study was to obtain such information using a survey. Materials and Methods:A survey on aspects of justification, optimisation and training was distributed to all dental practices having CBCT equipment and a contract with Dental X-ray Protection Services (DXPS). Results:Seventy-one completed surveys were received (49% response rate). A wide range of CBCT equipment was in use. The number of scans reported as being carried out was typically low. One third of respondents had acquired their CBCT machine within the last year. The clinical use was overwhelmingly in adult patients and related to implant dentistry. Small or medium field of view scans were most commonly used.Only 19.7% of respondents could provide detailed exposure factors. Patient protective shielding for patients was almost never used. The dentist always or mainly performed the CBCT reporting in 88.7% of practices. Conclusions:The survey provided no evidence of excessive use of CBCT in UK dental practices.The typical reported use was of small field of view scans for implant dentistry. Only 8.4% of practices performed examinations on children and young people. Some concerns were raised regarding respondents' knowledge about exposure factors and the clinical evaluation of images. IN BRIEF Presents an overview of the current use of CBCT in UK dental practices Suggests that most CBCT examinations are small field of view scans for adult patients in the context of implant dentistry Raises some questions about knowledge of exposure factors and the training for clinical evaluation of CBCT images
The present work describes the biosynthesis of silver nanoparticles (NPs) from Cassia auriculata flower extract. The existence of elemental Ag with surface plasmon resonance at 430 nm was shown by ultraviolet-visible spectroscopy. Fourier transform infrared spectroscopy was performed to identify the effective functional groups of the flower extract. Spherical, polydisperse Ag NPs with high-crystallinity face-centered cubic structure were revealed by X-ray diffraction and transmission electron microscopy. The reduction of Ag + ions and their binding energy were characterized by X-ray photoelectron spectroscopy. The Ag NPs degrade methylene blue dye to 70 % within 120 min. The quenching of O 2 , h + , and OH . was evaluated. These properties suggest that silver NPs have potential applications in environmental-related areas.
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