Mobile robotic teleguide based on video images

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Design of Luminescent Materials with "Turn-On/Off" Response for Anions and Cations

The detection of biologically important and environmentally pollutant anions and cations has become an essential task in many fields such as clinical, biomedical, and environmental monitoring, agriculture, and process controlling. The determination and control of them are of great interest to many scientists including chemists, biologists, clinical biochemists, and environmentalists since they play important roles. To date, a variety of analytical methods have been used in the detection of anions and cations. But, these methods require expensive analytical instruments and sophisticated experimental instrumentation and are timeconsuming due to a sample collection, transportation, and pretreatment. In the past years, the development of luminescent materials for the detection of anions and cations has received great attention. Fluorescence detection provides several advantages such as high sensitivity, simple instrumentation, facile analysis, intrinsic selectivity, and the capacity for rapid, real-time monitoring over other mentioned methods and generally involves the design and synthesis of a luminoionophore containing more than one binding sites and a signaling unit. A number of selective luminescent probes on the basis of the nature of the luminophore including rhodamine, triphenylamine, coumarin, calixarene, pyrene, BODIPY, 8-hydroxy-quinoline, anthraquinone, BINOL, and salicylicnaphthaldehyde units have been reported. The present article does not, however, attempt to cover all of the different approaches to luminescent materials for anions and cations. © 2017 Scrivener Publishing LLC. All rights reserved

Clinical behavior of second-generation zirconia monolithic posterior restorations: Two-year results of a prospective study with Ex vivo analyses including patients with clinical signs of bruxism.

OBJECTIVES: This study aimed to investigate (1) clinical outcomes of second-generation zirconia restorations, including patients with bruxism clinical signs, and (2) the material wear process. METHODS: A total of 95 posterior monolithic zirconia tooth-elements in 45 patients were evaluated, 85 on implants and 10 on natural teeth, and 20.3% of restorations being fixed partial dentures (FPDs). Occlusal contact point areas were determined and half of those areas were left unglazed and just polished. Restorations were clinically evaluated following criteria of the World Dental Federation and antagonistic teeth were examined at each evaluation time. Wear ex vivo analyses using SEM and 3D laser profilometry were performed at baseline and after 6 months, 1year, and 2 years respectively, temporarily removing the prostheses. RESULTS: The Kaplan-Meier survival rate of restorations was 93.3% (100% for FPDs) and the success rate was 81.8%, with 4 abutment debondings, 3 tooth-supported crown debondings (provisional cement use), 1 restoration fracture, 1minor chipping, 1 core fracture, 1 root fracture, and 2 implant losses. 80% of catastrophic failures occurred in patients with clinical signs of bruxism (61.7% of patients). Complications were also observed on antagonistic teeth (3 catastrophic failures). Clinical evaluation of the restorations showed good results from the aesthetic, functional, and biological perspective. Zirconia wear was inferior to 15mum, while glaze wear was observed on all occlusal contact areas after 1year. CONCLUSIONS: Monolithic zirconia FPDs are promising but the failure rate of single-unit restorations was not as high as expected in this sample including patients with bruxism clinical signs. CLINICAL SIGNIFICANCE: Within study limitations, FPDs showed excellent short-term results but further research is needed for single-unit restorations considering samples, which do not exclude bruxers. The weak link is the restoration support or the antagonist tooth, one hypothesis being that zirconia stiffness and lack of resilience do not promote occlusal stress damping