Evaluation of Dental Surface after De-Bonding Orthodontic Bracket Bonded with a Novel Fluorescent Composite: In Vitro Comparative Study

The use of a new fluorescent composite can reduce some of the problems related to procedures of de-bonding orthodontic bracket (enamel damage, dentine lesions, and composite residuals). The aim of the presented study was to compare the effect of fluorescent and conventional non-fluorescent composite on dental surface and composite remnants by in vitro de-bonding tests. De-bonding of florescent composite (DFC) and the de-bonding of standard composite (DSC) were performed by operators on an in vitro sample of 48 teeth under UV light (360–370 nm min 20 mW/cm2). Modified ARI (Adhesive Remnant Index), scored under 5.0×/235 magnification, was used for evaluation of dental surface after the procedure, and the duration required for de-bonding was measured. Significant differences in ARI between the two groups were observed (Pearson two-tailed p = 0.006 1.4 ± 0.1 95% C.I.), and the average duration of de-bonding was 38 s (DFC) and 77 s (DSC) per tooth, respectively (Mann–Whitney test p = 0.015; 57.7 ± 19.9 95% C.I.). The use of fluorescent composite could significantly improve the quality of de-bonding by reducing the quantity of composite residuals and visible enamel damage, while reducing time needed for successful procedure performance

Three-dimensional spin-wave dynamics, localization and interference in a synthetic antiferromagnet

Spin waves are collective perturbations in the orientation of the magnetic moments in magnetically ordered materials. Their rich phenomenology is intrinsically three dimensional, from the trajectory of the spin precession during their propagation, to the profiles of the spin-wave mode throughout the volume of the magnetic system. This gives rise to novel complex phenomena with high potential for applications in the field of magnonics. However, the three-dimensional imaging of spin waves, key to understanding and harnessing these phenomena, has so far not been possible. Here, we image the three-dimensional dynamics of spin waves excited in a synthetic antiferromagnet, with nanoscale spatial resolution and sub-ns temporal resolution, using time-resolved magnetic laminography. In this way, we map the distribution of the spin-wave modes throughout the volume of the structure, revealing unexpected depth-dependent profiles originating from the interlayer dipolar interaction. We experimentally demonstrate the existence of complex three-dimensional interference patterns, and analyze them via micromagnetic modelling. We find that these patterns are generated by the superposition of spin waves with non-uniform amplitude profiles, and that their features can be controlled by tuning the composition and structure of the magnetic system. Our results open unforeseen possibilities for the study of complex spin-wave modes and their interaction within nanostructures, and for the generation and manipulation of three-dimensional spin-wave landscapes for the design of novel functions in magnonic devices.Comment: 15 pages, 4 figure

I modelli VaR nell'attività di asset management

Si analizzano: e peculiarità della finanza strutturata e del mercato del project finance, il sistema di rating interni nel credit risk management, i modelli VaR applicati al rischio di credito, i prodotti derivati su commodities, il real estate leasing

Orthodontic movement of a dilacerated maxillary incisor in mixed dentition treatment

Dilaceration is a dental deformity characterized by an angulation between crown and root causing non-eruption of the tooth. It generally occurs following trauma to the deciduous dentition the apices of which lie close to the permanent tooth buds. Surgical extraction used to be the first choice in treating the severely dilacerated teeth. In this case report, it is described how a dilacerated central incisor was successfully moved into alignment in a young patient with proper surgical and orthodontic management avoiding use of prosthetic/implant devices. The panoramic radiograph after the traumatic injury is compared with the one at the end of treatment. The results were sustainable over long-term in both periodontal and aesthetic terms

Orthodontic treatment in elderly patients

In recent years there has been a significant increase in the number of elderly patients requesting orthodontist consultations. Masticatory performance is an important factor influencing the quality of life in independent healthy elderly subjects and only the restoration of skeletal and dental relationships in the three planes of space can assure oral health and functions with the consequential nutritional balance of the whole organism. The rehabilitation treatment in elderly subjects must comprehend orthodontic and prosthetic needs. This kind of treatment has two main goals: firstly, the restoration of oral function and secondly the restoration of facial morphology.Objective: In recent years there has been a significant increase in the number of elderly patients requesting orthodontist consultations.Masticatory performance is an important factor influencing the quality of life in independent healthy elderly subjects and only the restoration of skeletal and dental relationships in the three planes of space can assure oral health and functions with the consequential nutritional balance of the whole organism.The rehabilitation treatment in elderly subjects must comprehend orthodontic and prosthetic needs. This kind of treatment has two main goals: firstly, the restoration of oral function and secondly the restoration of facial morphology. Materials and methods: In this article three clinical cases treated with multidisciplinary approach are described showing an efficient procedure to a successful management of the elderly patients. Results: The results obtained underlined an oral cavity in good condition which facilitates adequate nutritional intake, an essential factor in the health and well-being of elderly patients and it is important for preserving physical and mental health. Conclusions: With appropriate treatment planning and selection of the patients, the orthodontic therapy can be accomplished successfully elderly patients. \ua9 2010 Societ\ue0 Italiana di Ortodonzia SIDO