Bend testing of wrought wire removable partial denture alloys

Heat Treatment of Dental Alloys: A Review

“…These clasps can be cast as part of the entire framework, or alternatively wire clasps can be joined to the cast framework in the dental laboratory [1,2]. Both noble metal and base metal wires for clasps are available [20]. Because of their superior strength compared to the cast base metal alloys, wire clasps with smaller cross-section dimensions can be used with the frameworks, but caution is required during joining in the dental laboratory to avoid overheating that will cause loss of the wrought microstructure.…”

Guidelines for the choice of circumferential wrought wire and cast clasp arms for removable partial dentures

“…These clasps need to be flexible enough to allow the RPD to be seated and removed numerous times without permanently deforming the clasp and without damaging the tooth. 11 , 15 , 16 , 17 , 18 , 19 The flexibility of a clasp is influenced by its length, diameter, cross-sectional form, and by its material. 14 , 18 , 19 , 20 , 21 , 22 , 23 If the amount of force required to overcome an undercut is beyond the proportional limit of the clasp arm, either the tooth will be affected or the clasp arm will be permanently deformed or will fracture.…”

“…11 , 15 , 16 , 17 , 18 , 19 The flexibility of a clasp is influenced by its length, diameter, cross-sectional form, and by its material. 14 , 18 , 19 , 20 , 21 , 22 , 23 If the amount of force required to overcome an undercut is beyond the proportional limit of the clasp arm, either the tooth will be affected or the clasp arm will be permanently deformed or will fracture. 14 , 17 , 24 …”

Effect of bending on the mechanical properties of gold wrought-wire clasps: a non-linear finite element analysis

“…The wrought wire clasps exhibit some advantages because of their superior mechanical properties as compared to the cast clasps, which possess unavoidable casting defects 1,2) . From previous experiments utilizing three-point bending 3) and cantilever bending tests 4,5) , the bending flexibility, permanent deformation, and fatigue strength of 'as manufactured' straight wires have been reported 1,[3][4][5][6] . However, the mechanical properties of straight wire can change during the process of bending and manipulation 7) .…”