Method of treating a partially or totally edentulous patient

摘要

A method of treating a patient having a toothless site (10) in a jaw comprising the steps of providing a fixture (1) for anchorage in the bone (5) of the jaw at the toothless site having a coronal end (9); anchoring the fixture in the bone such that the coronal end is submerged beneath the coronal margin (8) of the gingival layer (7) at the toothless site; providing an abutment (31a; 31b; 31c) which is securable in an operational position to the fixture through an opening (12) provided through the gingival layer to the fixture, the abutment having a transgingival structure (37) which comprises an apical section (41) which tapers outwardly from an apical end of the transgingival structure which in the operational position of the abutment is co-planar with the coronal end of the fixture to a position at which the transgingival structure has a maximum transverse dimension and a coronal section (43) contiguous with the apical section which tapers inwardly from the maximum transverse dimension to a coronal end of the transgingival structure, the apical section terminating at the position of maximum transverse dimension with a convex outer surface profile; removing material from the transgingival structure so as to form a peripheral shoulder (54) of a profile which closely follows that of the coronal margin of the gingival layer at said opening; and forming a crown structure (60; 160) which seats on the peripheral shoulder when the abutment is secured to the fixture.