Stress-relaxation testing. Part IV: Clasp pattern dimensions and their influence on clasp behavior

Effect of Clasp Design on Retention at Different Intervals Using Different Abutment Materials and in a Simulated Oral Condition

“…Each time the machine was set at 8 mm/sec with 3 kg load. Each specimen was cycled in 200 ml artificial saliva (38.1 mg NaCl/100 ml; 88.2 mg KCl/100 ml; 5.4 ml 100 m MKPO 4 PH7; 16 mg CaCl 2 /100 ml; Procine‐mucine 200 mg/100 ml) …”

“…Each specimen was cycled in 200 ml artificial saliva (38.1 mg NaCl/100 ml; 88.2 mg KCl/100 ml; 5.4 ml 100 m MKPO 4 PH7; 16 mg CaCl 2 /100 ml; Procine-mucine 200 mg/100 ml). 9,18 After each cycling interval, each direct retainer within the DRHD was removed from the chewing simulator device and mounted on the universal testing machine. The retention force was measured.…”

“…Various clasp designs for achieving sufficient retention for RPDs have been discussed . The long‐arm clasps (roach, back‐action, reverse back‐action, modified ring, and extended arm varieties) have more retentive force than short‐arm clasps…”

“…2 Various clasp designs for achieving sufficient retention for RPDs have been discussed. [3][4][5][6][7][8][9][10][11] The long-arm clasps (roach, back-action, reverse back-action, modified ring, and extended arm varieties) have more retentive force than short-arm clasps. 12 The integrity of the enamel surface upon which retainers are placed affects the serviceability of the prosthesis.…”

In vitro Assessment of Clasps of Cobalt-Chromium and Nickel-titanium Alloys in Removable Prosthesis

“…Morris et al also evaluated the permanent deformations in clasps tips and concluded that permanent deformation of the tip of the clasp by more than 0.25 mm may be considered as significant. 15 However, our each group had relatively small number of patients (n = 15). A further study with larger study groups is required for improving the quality of the clasps and the prognosis of the treatment.…”