is for its part assessed by a loosening test in brief this loosening test consists in immersing the end of a monofilament in a microdrop of resin in bringing about the polymerization of the resin at ambient temperature and under an electron beam and in then exerting a tensile stress on the other end of the monofilament at the rate of 1 mm min while keeping the drop of resin stationary the tensile force is recorded over time the maximum tensile force recorded is regarded as the force necessary for the loosening of the monofilament from the cured resin drop the interfacial shear strength ifss is determined using the following formula l represents the length of monofilament initially inserted into the drop of resin in metre f represents the force necessary for the loosening of the monofilament from the cured resin drop in newton and the loosening test is carried out on several monofilaments of ims5001 fibres which have been grafted with groups comprising a thiol functional group and several monofilaments of ims5001 fibres which have not been grafted so as to be meaningful the results show that the ifss is 59 u00b1 3 mpa in the case where the ims5001 fibres were grafted to groups comprising a thiol functional group whereas it is only 49 u00b1 4 mpa in the case where the ims5001 fibres were not grafted the ifss is thus increased by 20.