Abstract: A bridge support (1, 60, 90, 140) for arrangement to an implant (2) has a surface abutting (30) the implant (2), and a first compressible sealing (31) integrally made with said surface (30). The bridge support (1, 60, 90, 140) has a through channel (33) ending at said surface and is shaped so that a shoulder (34) is formed inside said channel (33), and has a second compressible sealing (35) integrally made with said shoulder (33). According to a second embodiment the bridge support (1, 60, 90, 140) has external protrusion at an outside (160) integrally made with the bridge support (1, 60, 90, 140). A screw (3, 250) for fastening the bridge support (1, 60, 90, 140) to an implant has a head (230, 252) with an abutment surface (231) and a stem (232, 252), and has a compressible sealing (237) integrally made with said abutment surface (230). The stem (232, 252) has an external longitudinal recess (234) or a longitudinal through hole (251).