2019 Volume 32 Issue 1 Pages 65-70
Purpose : The passivity of the superstructure is one of the important factors for long-term stability. The screw-retained su perstructure is an excellent method with no risk of excess cement and retrievability for long-term maintenance, but the man ufacturing procedure is complicated and the passivity may be dependent on the skill of the dentist and technician. This paper proposes a method that improves passivity by a relatively simple esthetic technique that is strong enough and not dependent on skill.
Method : Intermediate structures with an abutment form are fabricated on a regular screw-retaining type abutment, and a bridge form cast metal superstructure with screw holes is made on them for test-fitting. Fitting and occlusal adjustment are made intra-orally using the metal superstructure, then it is scanned to fabricate the zirconia superstructure. Screw-retaining intermediate structures and zirconia superstructure are cemented together intra-orally. For removing excess cement and pol ishing, the combined structure is unscrewed, then is later reinstalled with screws.
Conclusion : By using the screw retention with cementation (SRC) technique in the superstructure, it is possible to reduce complications for the patient and dentist. It will easily improve the passivity with the esthetics. In addition, it will not cause excessive cement in the gingival sulcus.
