Pierre VIKTOROVITCH DR CNRS Ecole Centrale de Lyon Président Henri BENISTY Professeur Institut d’Optique Rapporteur Olivier PARRIAUX Professeur Université St-Etienne Rapporteur Joseph ZYSS Professeur Institut d’Alembert Examinateur Frank VOLLMER Ass. Professeur Max Planck Institute Examinateur Malcolm BUCKLE DR CNRS ENS Cachan Examinateur Chi Thanh NGUYEN IR CNRS ENS Cachan Encadrant de thèse I...

OBJECTIVES This study compared the mechanical properties of various instruments for canal exploration and glide-path preparations. MATERIALS AND METHODS The buckling resistance, bending stiffness, ultimate torsional strength, and fracture angle under torsional load were compared for C+ file (CP, Dentsply Maillefer), M access K-file (MA, Dentsply Maillefer), Mani K-file (MN, Mani), and NiTiFle...

Developments in the surgery of retinal detachment since the time of Gonin have led from simple to more complicated methods which are not always more effective. Among the simple methods is the cerclage operation, developed by Arruga, in which a string of Supramid thread is sewn around the eyeball on the sclera and a sharp buckle is created, thus diminishing the volume of the eye and separating t...

Multifunctional materials and devices found in nature serve as inspiration for advanced synthetic materials, structures and robotics. Here, we elucidate the architecture and unusual deformation mechanisms of seahorse tails that provide prehension as well as protection against predators. The seahorse tail is composed of subdermal bony plates arranged in articulating ring-like segments that overl...

We investigate the origin of undesirable transverse cracks often observed in thin films obtained by the layer transfer technique. During this process, two crystals bonded to each other containing a weak plan produced by ion implantation are heated to let a thin layer of one of the material on the other. The level of stress imposed on the film during the heating phase due to the mismatch of ther...

T he success of electronic paper, roll-up displays and many other potential applications of flexible electronics will depend on the availability of electronic materials that can be stretched, compressed and bent. Previous efforts to develop electronic materials that can be mechanically deformed without breaking have mainly focused on small organic molecules and polymers. Unfortunately, these ma...

OBJECTIVE Wrist buckle fractures are a frequent reason for emergency department visits. Although textbooks recommend 2 to 4 weeks of immobilization in a short arm cast, management varies. Treatment with both casts and splints is common, and length of immobilization varies. The objective was to determine if children with distal radius and/or ulna buckle fractures treated with a removable splint ...