Influence of occlusal collision corrections completed by two intraoral scanners or a dental design program on the accuracy of the maxillomandibular relationship.

STATEMENT OF PROBLEM Occlusal collisions of articulated intraoral digital scans can be corrected by intraoral scanners (IOSs) or dental design software programs. However, the influence of these corrections on the accuracy of maxillomandibular relationship is unclear. PURPOSE The purpose of this clinical investigation was to measure the effect of occlusal collision corrections completed by the IOSs or dental design software programs on the trueness and precision of maxillomandibular relationship. MATERIAL AND METHODS Casts of a participant mounted on an articulator were digitized (T710). The experimental scans were obtained by using 2 IOSs: TRIOS4 and i700. The intraoral digital scans of the maxillary and mandibular arches were obtained and duplicated 15 times. For each duplicated pair of scans, a bilateral virtual occlusal record was acquired. Articulated specimens were duplicated and assigned into 2 groups: IOS-not corrected and IOS corrected (n=15). In the IOS-not corrected groups, the IOS software program postprocessed the scans maintaining the occlusal collisions, while in the IOS-corrected groups, the IOS software program eliminated the occlusal collisions. All articulated specimens were imported into a computer-aided design (CAD) program (DentalCAD). Three subgroups were developed based on the CAD correction: CAD-no change, trimming, or opening the vertical dimension. Thirty-six interlandmark distances were measured on the reference and each experimental scan to compute discrepancies by using a software program (Geomagic Wrap). Root mean square (RMS) was selected to compute the cast modifications performed in the trimming subgroups. Trueness was examined using 2-way ANOVA and pairwise comparison Tukey tests (α=.05). Precision was evaluated with the Levene test (α=.05). RESULTS The IOS (P<.001), the program (P<.001), and their interaction (P<.001) impacted the trueness of the maxillomandibular relationship. The i700 obtained higher trueness than the TRIOS4 (P<.001). The IOS-not corrected-CAD-no-changes and IOS-not-corrected-trimming subgroups obtained the lowest trueness (P<.001), while the IOS-corrected-CAD-no-changes, IOS-corrected-trimming, and IOS-corrected-opening subgroups showed the highest trueness (P<.001). No significant differences in precision were found (P<.001). Furthermore, significant RMS differences were found (P<.001), with a significant interaction between Group×Subgroup (P<.001). The IOS-not corrected-trimmed subgroups obtained a significantly higher RMS error discrepancy than IOS-corrected-trimmed subgroups (P<.001). The Levene test showed a significant discrepancy in the RMS precision among IOSs across subgroups (P<.001). CONCLUSIONS The trueness of the maxillomandibular relationship was influenced by the scanner and program used to correct occlusal collisions. Better trueness was obtained when the occlusal collisions were adjusted by the IOS program compared with the CAD program. Precision was not significantly influenced by the occlusal collision correction method. CAD corrections did not improve the results of the IOS software. Additionally, the trimming option caused volumetric changes on the occlusal surfaces of intraoral scans

Study of the Influence of the polarization of the neighboring group C = X, in the kinetics of hydrogen chloride removal from b- (substituted) alkyl chlorides (X = CH2 , S, NH, PH), using the density functional theory

The elimination kinetics of the compounds 5-chloro 2-methylpentene, 5-chloropentan-2-imine, (5-chloropentan-2-ylidene) phosphine and 5-chloropenta2-thione compounds were studied using the electron structure methods: B3LYP, MW1PW91 and PBEPBE with the basis set 6-31++G(2d,p), respectively, belonging to the computational package G09W. According to the elimination products, two possible reaction mechanisms were proposed: a discrete path through a four-member transition state and a intime ion-par via a 5-membered cyclic transition state, where the C = X group assists, anchimerically, the HCl elimination. With the exception of the group X = CH2, the favorable mechanism occurs through an intimate Ion-Pair type 5-membered TS, where the breaking of the C2 - Cl1 bond is the determining step of the reaction. The concept of stabilization energy by anchimeric assistance was proposed and used to determine the following order of reactivity: S> PH> NH> O; A linear relationship between the free activation energy and the molecular polarizability of the transition states was found, suggesting that this parameter plays a pivotal role in the anchimerical assistance observed in these systems.La cinética de eliminación de los compuestos 5-cloro-2-metilpenteno, 5-cloropentan-2-imina, (5-cloropentan-2-iliden) fosfina y 5-cloropenta-2-tiona fue estudiada usando los métodos de estructura electrónica: B3LYP, MW1PW91 y PBEPBE con el set de bases 6-31++G(2d,p), pertenecientes al paquete computacional G09W. De acuerdo a los productos de eliminación, dos posibles mecanismos de reacción fueron propuestos: una vía discreta, a través de un estado de transición de cuatro miembros y una vía ión par-íntimo, vía un estado de transición cíclico de 5 miembros donde el grupo C=X asiste, anquiméricamente, la salida del átomo de cloro. Con la excepción del grupo X=CH2, el mecanismo favorable resulto ser el que ocurre a través de un TS de 5 miembros tipo Ion-Par íntimo, donde la ruptura del enlace C2 -Cl1 es el paso determinante de la reacción. El concepto de energía de estabilización por asistencia anquimérica fue propuesto y usado para determinar el siguiente orden de reactividad: S>PH>NH>O. Se encontró una relación lineal entre la energía libre de activación y la polarizabilidad molecular de los estados de transición, sugiriendo que este parámetro juega un rol fundamental en la asistencia anquimérica observada en estos sistemas

Effectiveness and safety of sofosbuvir‐based regimens plus an NS5A inhibitor for patients with HCV genotype 3 infection and cirrhosis: results of a multicenter real‐life cohort

[Abstract] Patients with HCV genotype 3 (GT3) infection and cirrhosis are currently the most difficult to cure. We report our experience with sofosbuvir+daclatasvir (SOF+DCV) or sofosbuvir/ledipasvir (SOF/LDV), with or without ribavirin (RBV) in clinical practice in this population. This was a multicenter observational study including cirrhotic patients infected by HCV GT3, treated with sofosbuvir plus an NS5A inhibitor (May 2014‐October 2015). In total, 208 patients were included: 98 (47%) treatment‐experienced, 42 (20%) decompensated and 55 (27%) MELD score >10. In 131 (63%), treatment was SOF+DCV and in 77 (37%), SOF/LDV. Overall, 86% received RBV. RBV addition and extension to 24 weeks was higher in the SOF/LDV group (95% vs 80%, P=.002 and 83% vs 72%, P=.044, respectively). A higher percentage of decompensated patients were treated with DCV than LDV (25% vs 12%, P=.013). Overall, SVR12 was 93.8% (195/208): 94% with SOF+DCV and 93.5% with SOF/LDV. SVR12 was achieved in 90.5% of decompensated patients. Eleven treatment failures: 10 relapses and one breakthrough. RBV addition did not improve SVR (RR: 1.08; P=.919). The single factor associated with failure to achieve SVR was platelet count <75×10E9/mL (RR: 3.50, P=.019). In patients with MELD <10, type of NS5A inhibitor did not impact on SVR12 (94% vs 97%; adjusted RR: 0.49). Thirteen patients (6.3%) had serious adverse events, including three deaths (1.4%) and one therapy discontinuation (0.5%), higher in decompensated patients (16.7% vs 3.6%, P<.006). In patients with GT3 infection and cirrhosis, SVR12 rates were high with both SOF+DCV and SOF/LDV, with few serious adverse events

Clinical Benefit of Tamsulosin and the Hexanic Extract of Serenoa Repens, in Combination or as Monotherapy, in Patients with Moderate/Severe LUTS-BPH: A Subset Analysis of the QUALIPROST Study

To investigate whether tamsulosin (TAM) and the hexanic extract of Serenoa repens (HESr) are more effective in combination than as monotherapy in men with moderate-to-severe lower urinary tract symptoms associated with benign prostatic hyperplasia (LUTS/BPH). Subset analysis of data from a 6-month, multicenter observational study. Patients received either tamsulosin (0.4 mg/day) or HESr (320 mg/day) alone or in combination. Primary endpoints were change in symptoms and quality of life. Tolerability was also assessed. Seven hundred and nine patients were available for intention to treat (ITT) analysis, 263 treated with tamsulosin, 262 with HESr, and 184 with TAM + HESr. After 6 months, International Prostate Symptom Score (IPSS) scores improved by a mean (standard deviation) of 7.2 (5.0) points in the TAM + HESr group compared to 5.7 (4.3) points with TAM alone and 5.4 (4.6) points with HESr (p < 0.001). Quality of life showed greatest improvement with combination therapy (p < 0.02). Adverse effects were reported by 1.9% of patients receiving HESr, 13.3% receiving TAM, and 12.0% receiving TAM + HESr (p < 0.001). In men with moderate/severe LUTS/BPH, combination treatment with TAM + HESr produced more effective symptom relief and greater improvement in quality of life than with either treatment alone, with acceptable tolerability

Effectiveness, safety/tolerability of OBV/PTV/r ± DSV in patients with HCV genotype 1 or 4 with/without HIV-1 co-infection, chronic kidney disease (CKD) stage IIIb/V and dialysis in Spanish clinical practice – preliminary data Vie-KinD study

Poster presentatio

Radial evolution of the April 2020 stealth coronal mass ejection between 0.8 and 1 AU - Comparison of Forbush decreases at Solar Orbiter and near the Earth

Aims. We present observations of the first coronal mass ejection (CME) observed at the Solar Orbiter spacecraft on April 19, 2020, and the associated Forbush decrease (FD) measured by its High Energy Telescope (HET). This CME is a multispacecraft event also seen near Earth the next day. Methods. We highlight the capabilities of HET for observing small short-term variations of the galactic cosmic ray count rate using its single detector counters. The analytical ForbMod model is applied to the FD measurements to reproduce the Forbush decrease at both locations. Input parameters for the model are derived from both in situ and remote-sensing observations of the CME. Results. The very slow (~350 km/s) stealth CME caused a FD with an amplitude of 3 % in the low-energy cosmic ray measurements at HET and 2 % in a comparable channel of the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) on the Lunar Reconnaissance Orbiter, as well as a 1 % decrease in neutron monitor measurements. Significant differences are observed in the expansion behavior of the CME at different locations, which may be related to influence of the following high speed solar wind stream. Under certain assumptions, ForbMod is able to reproduce the observed FDs in low-energy cosmic ray measurements from HET as well as CRaTER, but with the same input parameters, the results do not agree with the FD amplitudes at higher energies measured by neutron monitors on Earth. We study these discrepancies and provide possible explanations. Conclusions. This study highlights that the novel measurements of the Solar Orbiter can be coordinated with other spacecraft to improve our understanding of space weather in the inner heliosphere. Multi-spacecraft observations combined with data-based modeling are also essential to understand the propagation and evolution of CMEs as well as their space weather impacts

First year of energetic particle measurements in the inner heliosphere with Solar Orbiter's Energetic Particle Detector

Context. Solar Orbiter strives to unveil how the Sun controls and shapes the heliosphere and fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for just over a year. Aims. EPD measures suprathermal and energetic particles in the energy range from a few keV up to (near-) relativistic energies (few MeV for electrons and about 500 MeV nuc−1 for ions). We present an overview of the initial results from the first year of operations and we provide a first assessment of issues and limitations. In addition, we present areas where EPD excels and provides opportunities for significant scientific progress in understanding how our Sun shapes the heliosphere. Methods. We used the solar particle events observed by Solar Orbiter on 21 July and between 10 and 11 December 2020 to discuss the capabilities, along with updates and open issues related to EPD on Solar Orbiter. We also give some words of caution and caveats related to the use of EPD-derived data. Results. During this first year of operations of the Solar Orbiter mission, EPD has recorded several particle events at distances between 0.5 and 1 au from the Sun. We present dynamic and time-averaged energy spectra for ions that were measured with a combination of all four EPD sensors, namely: the SupraThermal Electron and Proton sensor (STEP), the Electron Proton Telescope (EPT), the Suprathermal Ion Spectrograph (SIS), and the High-Energy Telescope (HET) as well as the associated energy spectra for electrons measured with STEP and EPT. We illustrate the capabilities of the EPD suite using the 10 and 11 December 2020 solar particle event. This event showed an enrichment of heavy ions as well as 3He, for which we also present dynamic spectra measured with SIS. The high anisotropy of electrons at the onset of the event and its temporal evolution is also shown using data from these sensors. We discuss the ongoing in-flight calibration and a few open instrumental issues using data from the 21 July and the 10 and 11 December 2020 events and give guidelines and examples for the usage of the EPD data. We explain how spacecraft operations may affect EPD data and we present a list of such time periods in the appendix. A list of the most significant particle enhancements as observed by EPT during this first year is also provided.Ministerio de Economía y CompetitividadAgencia Estatal de Investigació

Effects of the lava flows associated with the eruption of the volcano ot Cumbre vieja (2021) on the insular shelf and slope of La Palma island (Canary Islands)

Peer reviewe

Effects of the lava flows associated to the Tajogaite volcano eruption (2021) on the insular shelf and slope of La Palma island

The eruption of the Cumbre Vieja volcano started on September 19, 2021, on the island of La Palma, following a seismic swarm that affected the southern half of the island. The lava flowed westward and reached the coastline 8 days later in the area between Punta de la Bombilla and Tazacorte harbour. Four oceanographic cruises on board the research vessels Ramón Margalef and Ángeles Alvariño (Spanish Institute of Oceanography, IEO-CSIC) aimed to (i) characterizing the petrologic features prior to the arrival of the lava flows into the coastline, (ii) assessing the variations of the water-magma system when the lava flowed into the sea, and (iii) evaluating the main changes in the system after the end of the eruption. High-resolution bathymetric maps obtained with the multibeam echosounder EM710, combined with submarine high- definition ROV LIROPUS images and rocks samples collected from the sea bottom, showed that lava flowed down the shelf and upper slope as block (aa) and pillow lava flows, being conditioned by small gullies on the upper slope. Significant morphological changes have been defined in the subaerial northern and southern lava deltas (areas of 5,4 and 43 ha, respectively), and on a submarine area of ~30 ha. Volcanic material has been identified as far as 1.2 km from the original coastline at ~305 m seawater depth. Preliminary petrographic studies determine that the began as tephrites and later evolved intro basanites with olivine, pyroxene, amphibole and plagioclase phenocrysts within a glassy matrix with variable number of vesicles. The total volume of lava reaching the submarine environment is estimated of around 3 Mm3 with maximum thickness ca. 40 m along previous submarine slope gullies. Integrated with multidisciplinary analyses of the water column and ecosystem changes, this study will improve the knowledge of the magmatic evolution from depth up to eruption and will be useful for the risk management of future eruptive events.Peer reviewe