In order to minimize the damage caused by the 2D structures, several research have been done on more complex structures (3D-preforms) which have more interesting mechanical characteristics. Divers textile technologies are used to manufacture 3D preforms such as weaving, knitting, stitching, z-pinning, tufting… This kind of reinforcement aims to achieve a balance between the in-plane and out-of-plane properties. Recently, the tufting technology shows more opportunities to develop 3D reinforcements especially with the advances in robotics. The present paper focuses not only on the various technologies of reinforcement through the thickness but also on the mechanical behaviour of a tufted preform in a stamping process.

To date, nonwoven fabrics made with natural fibres and thermoplastic commingled fibres have been extensively used in the composite industry for a wide variety of applications. This paper presents an innovative study about the effect of the manufacturing parameters on the mechanical behaviour of flax/PP nonwoven reinforced composites. The mechanical properties of nonwoven fabric reinforced composites are related directly to the ones of dry nonwoven reinforcements, which depend strongly on the nonwoven manufacturing parameters, such as the needle-punching and areal densities. Consequently, the influence of these manufacturing parameters will be analysed through the tensile and flexural properties. The results demonstrated that the more areal density the nonwoven fabric has, the more the mechanical behaviour can be tested for composites. By contrast, it has a complex influence on needle-punching density on the load-strain and bending behaviours at the composite scale.

Background: Bioceramic materials have emerged as a significant advancement in endodontics, offering excellent biocompatibility, sealing ability, and bioactivity. Their use has expanded in recent years, particularly for pulp capping, perforation repair, and regenerative procedures. Objectives: This study aimed to assess the knowledge of bioceramics among private practice dentists, evaluate the frequency of use of sealing and filling bioceramics, and examine the applied clinical protocols as well as potential shortcomings. Materials and methods: This cross-sectional study was conducted according to Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines, based on an epidemiological Knowledge, Attitudes, and Practices (KAP) survey. It was carried out among Tunisian private practice dentists. Data were processed and analyzed using Excel 2007 and Statistical Package for the Social Sciences (SPSS) Statistics 21.0. The sample size was calculated using the standard formula for estimating a proportion in a cross-sectional study, and participants were randomly selected. Participation was voluntary, anonymous, and confidential. Results: A total of 200 dentists participated. Only 54.5% reported using sealing bioceramics, with 35.05% using them in all cases, 19.94% for periapical lesions, and 16.92% for root perforations. Approximately half of the dentists (53.01%) observed faster healing when using these sealers. Regarding filling bioceramics, 67.5% of participants used them, with a preference for MTA. These materials were indicated for various clinical situations, including repair of floor perforations, pulp capping, apexification of immature permanent teeth, and repair of root perforations. However, 45.61% of participants reported treatment failures when using these bioceramics, with failure to adhere to one of the endodontic treatment steps identified as the primary cause. Conclusion: This study concluded that younger dentists tend to use bioceramics more frequently, filling bioceramics are better known than sealing ones, and most participants are familiar with the clinical indications of these materials. It is essential to provide further guidance and recommendations on the clinical application of bioceramics to optimize treatment outcomes.

The presence of the tufts has direct influence on the permeability of textile preforms. In this paper, new insights are presented into the mechanisms responsible for changes to the in-plane permeability of tufted preforms according to three different tufting patterns relative to flow direction with a constant tufting distance. The saturated permeabilities are measured based on the rectilinear flow in a tool constituted by a steel base, a transparent PMMA top, and steel supports. Beforehand, the permeability measurements of textile preform composed of eight layers of plain weave glass fabric without tufting are conducted at three different cavity heights. The results show that the in-plane permeability values for the tufted preforms are lower than the permeability values of the preform without tufting. The paper reveals the significant influence of the tufting patterns on the permeability values for three different fibre volume fractions.

ESAFORM is an association with the mission to stimulate applied and fundamental research in the field of material forming. Its annual conference, the International ESAFORM Conference on Material Forming, is used to achieve one of the main goals of ESAFORM: to spread scientific and technological information related to material forming within academic and industry. The next conference will be held online on 14-16 April 2021.