Les sols grossiers à matrice, matériaux contenant des grains allant du micromètre à plusieurs dizaines de centimètres, sont fréquemment utilisés dans divers projets géotechniques tels que les digues et les remblais. La détermination de la résistance au cisaillement de ces sols dans les appareils standards de laboratoire est difficile en raison de l...
The thesis is aimed at characterising the multi-scale and hydro-mechanical behaviour of lightly compacted silty sand penetrated by a turf-grass (Cynodon Dactilon). The study will allow better assessing the impact of vegetation on this compacted soil that has been used in an experimental and fully-instrumented embankment.The literature agrees that r...
Published in International orthodontics
Enamel microcrack formation has a high incidence after mechanical debonding of ceramic brackets. This may be due to high delivered shear bond strength values when enamel is priorly etched by phosphoric acid. It is still not well elucidated in the literature if laser etching affects enamel the same way. The aim of the research was to analyze differe...
Published in International orthodontics
To evaluate and compare the shear bond strength (SBS) of orthodontic molar tubes bonded using two hydrophilic primers along with a moisture tolerant adhesive system to dry and saliva-contaminated enamel surfaces; and to assess the mode of their bond failure. A total of 60 extracted human mandibular molars were randomly divided into three major grou...
Published in International orthodontics
The number of adult patients seeking orthodontic treatment has been consistently increasing. Since the placing of the final restoration must be postponed until the completion of the orthodontic treatment, provisional restoration is recommended for the duration of the orthodontic treatment. These surfaces have special chemical properties, which nece...
Published in International orthodontics
The aim of this study was to determine the effect of bleaching and desensitizing on shear bond strength (SBS) of metal brackets to enamel. One hundred extracted human premolar were randomly assigned to 5 groups of 20. In the first group (control), no bleaching or desensitizing agent was used. Groups 2 to 5 were bleached with 37.5% hydrogen peroxide...
Published in International orthodontics
There are controversies regarding the most reliable conditioning method of the aged composite surface to ensure optimum bond strength. The purpose of this study was to evaluate the shear bond strength of metal brackets to microhybrid composite restorations after different surface preparation techniques. A total of sixty microhybrid composite sample...
Le présent travail concerne une étude de valorisation des matériaux locaux de la région de Lag-houat (région du sud de l’Algérie) à base de sable calcaire (sable concassé) et de tuf, associés à la bentonite en vue d’améliorer leurs caractéristiques hydrauliques pour la réalisation des barrières ou-vragées des installations de stockage des déchets (...
The complex nature of clay has aroused great interest of researchers in its mechanical behaviour and microstructure. The objective of this research is to examine the influence of triaxial stress paths on the mechanical behaviour of remoulded clay and the mechanisms that occur at the microstructural level. The dilatancy phenomenon is particularly in...
La justification de la stabilité d'un barrage-poids existant sur une fondation rocheuse nécessite une justification de la stabilité vis-à-vis du glissement à l'interface entre béton et roche. Le comportement au cisaillement de cette interface dépend de l'effort normal appliqué, des déformabilités de la roche et du béton, de la morphologie de la sur...
