| 1. |
- Kayser, Yves, et al.
(författare)
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Core-level nonlinear spectroscopy triggered by stochastic X-ray pulses
- 2019
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Ingår i: Nature Communications. - : Springer Nature. - 2041-1723. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- Stochastic processes are highly relevant in research fields as different as neuroscience, economy, ecology, chemistry, and fundamental physics. However, due to their intrinsic unpredictability, stochastic mechanisms are very challenging for any kind of investigations and practical applications. Here we report the deliberate use of stochastic X-ray pulses in two-dimensional spectroscopy to the simultaneous mapping of unoccupied and occupied electronic states of atoms in a regime where the opacity and transparency properties of matter are subject to the incident intensity and photon energy. A readily transferable matrix formalism is presented to extract the electronic states from a dataset measured with the monitored input from a stochastic excitation source. The presented formalism enables investigations of the response of the electronic structure to irradiation with intense X-ray pulses while the time structure of the incident pulses is preserved.
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| 2. |
- Vanden Bogarde, Leonardo, et al.
(författare)
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Immediate Function of 3.25 mm Diameter Implants in Aesthetic Regions. An 18-month Clinical, Radiographic and Resonance Frequency Analysis (RFA) Study.
- 2019
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Ingår i: Journal of Dental and Maxillofacial Research. ; 2:2, s. 1-6
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to evaluate the use of narrow implants (3.25 mm) to replace upper lateral and lower incisors according to an established immediate function protocol. A total of 49 narrow implants (Neoss Proactive 3.25 mm implants, Neoss Ltd, Harrogate, UK) in 35 patients were evaluated. Thirty-one implants were placed in the mandible and 18 in the maxilla. The mean insertion torque was measured in Ncm. Thirty-six implants were placed in fresh extraction sockets. Implant stability measurements were performed at baseline, after 2, 4, 6 weeks and 3, 6 months using resonance frequency analysis (RFA) measurements (Osstell ISQ™, Osstell AB, Gothenburg, Sweden) expressed in ISQ units (Implant Stability Quotient). The patients were followed with clinical and radiographic examinations for 18 months. One implant failed after 4 weeks giving a cumulative survival rate of 98.0 % and the marginal bone loss amounted to 0.7 + 1.0 mm after 18 months. The mean insertion torque was 36 + 9.1 Ncm. The mean ISQ values indicated firm stability at baseline in both mesial-distal and buccal-lingual directions (i.e. above 65 ISQ). The ISQ curve presented a significant drop after 2–4 weeks where after the stability recovered progressively up to 6 months. It is concluded that upper lateral and lower incisors can be replaced with 3.25 mm implants according to an immediate loading protocol with high survival rate and minimal marginal bone loss. Moreover, the immediately loaded implants showed an initial dip of stability during the first 4 weeks followed by an an increase with time.
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