Mineral trioxyde aggregate versus calcium hydroxide in apexification of non vital immature teeth: Study protocol for a randomized controlled trial

<p>Abstract</p> <p>Background</p> <p>Pulp necrosis is one of the main complications of dental trauma. When it happens on an immature tooth, pulp necrosis implies a lack of root maturation and apical closure. A therapy called apexification is required to induce the formation of a calcified apical barrier allowing a permanent and hermetic root filling. The aim of this prospective randomized clinical trial is to compare Mineral Trioxide Aggregate(MTA)with Calcium Hydroxide(CH)as materials used to induce root-end closure in necrotic permanent immature incisors.</p> <p>Methods/Design</p> <p>This study, promoted by AP-HP, was approved by the ethics committee(CPP Paris Ile de France IV). 34 children aged from 6 to 18 years and presenting a non-vital permanent incisor are selected. Prior to treatment, an appropriate written consent has to be obtained from both parents and from children. Patients are then randomly assigned to either the MTA(experimental)or CH(control)groups. Recalls are performed after 3, 6 and 12 months to determine the presence or absence of a calcified apical barrier through the use of clinical and radiographic exams. Additional criteria such as clinical symptoms, apical radiolucencies, periapical index(PAI)are also noted.</p> <p>Trial registration</p> <p>ClinicalTrials.gov no. <a href="http://www.clinicaltrials.gov/ct2/show/NCT00472173">NCT00472173</a> (First inclusion: May 10, 2007; Last inclusion: April 23, 2009; study completed: April 15, 2010)</p

Nouvelles données sur la diversité des formes de l’habitat au Néolithique en Thessalie Orientale : le projet IGEAN

La Thessalie est une région charnière dans les voies de néolithisation européennes. Plus de 300 tells, appelés localement magoules, se répartissent sur l’ensemble de ce territoire délimité par la Mer Égée à l’Est et au Nord, les Monts du Pélion à l’Est, Antichisia et Olympe au Nord et Othrys au Sud. La plaine est divisée en plusieurs entités : la plaine de Larissa au Nord, séparée de la plaine de Karditsa au Sud par les monts de Thessalie. À l’Est, la plaine côtière d’Almyros s’étend au Sud d..

ENERGY-DISSIPATION DURING A SMALL SUBSTORM

The relative importance of the two most likely modes of input energy dissipation during the substorm of 8 May 1986, with an onset at 12:14 UT (CDAW 9E event), is examined here. The combination of data from the interplanetary medium, the magneto-tail and the ground allowed us, first of all, to establish the sequence of phenomena which compose this substorm. In order to calculate the magnetospheric energetics we have improved the Akasofu model, by adding two more terms for the total magnetospheric output energy. The first one represents the energy consumed for the substorm current wedge transformation, supplied by the asymmetric ring current. This was found to be 39% of the solar wind energy entering the magnetosphere from the start of the growth phase up to the end of the expansion phase. The second term represents the energy stored in the tail or returned to the solar wind. Our results suggest that the substorm leaves the magnetosphere in a lower energy state, since, according to our calculations, 23% of the energy that entered the magnetosphere during the whole disturbance was returned back to the solar wind. Finally, it is interesting to note that during the growth phase the driven system grow considerably, consuming 36% of the solar wind energy which entered the magnetosphere during this early phase of the substorm

Etude du colmatage de membranes minerales de microfiltration tangentielle par les macromolecules du vin

Available at INIST (FR), Document Supply Service, under shelf-number : AR 14537 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc