Caractérisation et potentialités de matériaux de restauration dentaires avec potentiel adhésif.

par Philippe Francois

Projet de thèse en Doc sciences des materiaux

Sous la direction de Jean-Pierre Attal.

Thèses en préparation à Paris 13 , dans le cadre de École doctorale Galilée (Villetaneuse, Seine-Saint-Denis) depuis le 08-12-2019 .

Pas de résumé en français disponible.

Résumé

Today, the trend in dentistry is at the market launch of hybrid materials. Historically, 3 major families of materials have been used to carry out direct restorations in the mouth: resin composites, glass ionomer cements and amalgam. Amalgam is being less and less used because of environmental problems caused by mercury but also for reasons of biocompatibility. Composite resins are the gold standard in dentistry because of their good mechanical and optical properties but their implementation is complicated for the practitioner: they are time consuming, a good sealing is mandatory and adhesive procedures are complicated because the material does not have any intrinsic adhesion. Glass-ionomer cements (GICs) are easy to use, have an intrinsic adhesion to hard dental tissues, and are able to release fluoride but their weak mechanical properties limit their use as definitive restoration. In order to try to overcome this problem, new mechnically reinforced generations of GIC called high viscous glass ionomer cements (HV-GIC) have been lauched on the market. The goal of new "hybrid" materials, between the composite and the glass ionomer cements, is to combine the advantages of each of these families in order to offer to the greatest number of practitioners the possibility of performing efficient restorations. While this idea had been a failure twenty years ago, developments in chemistry have made possible the appearance of promising new formulations on the market in recent years. To date, little data is available on new generations of high viscous glass ionomer cements and these "hybrid materials". The purpose of this thesis is at first to understand their chemistry and to characterize their mechanical and adhesive properties. In a second time, other properties of these materials will be studied as their bioactivity, their aesthetics and their biocompatibility.