Endodontically treated teeth can be restored in several ways. The prognosis of these teeth does not only depend on an adequate endodontic treatment, but also on a solid restoration that protects the weakened tooth against fracture. Adhesive core build-up procedures, possibly with the application of new generation glass fibre posts, become more and more in favour. This article is dealing with the considerations that should be made when adhesive core build-up procedures are used and more specific with core build-up procedures for endodontically treated premolars.