An in vitro comparison of retentive force and deformation of acetal resin and cobalt-chromium clasps

摘要: Statement of problem The use metal clasps on anterior teeth may cause esthetic problems. Recently, acetal resins have been used as an alternative tooth-colored denture clasp material to improve esthetics. However, there are few studies support resin use. Purpose purpose this in vitro study was compare the retentive force and deformation cobalt-chromium after 36 months simulated clinical Material methods Forty each (1.2 or 2.0 mm thick) (Dentorium)(1.2 were fabricated using half-round standard prefabricated patterns. groups further subdivided (n=10) into type tooth (premolar molar model) undercut (0.25 0.50 mm). measured distilled water by a specially designed insertion-removal testing apparatus with intervals corresponding 0, 6, 12, 18, 24, 30, removable partial denture. distance between tips (mm) microscope before procedure. Comparison mean values (gram force) conducted 3-way analysis variance Least Significant Difference (LSD) multiple range test (α=.05). Results tensile load required dislodge 1.2-mm thickness (111.6 g 0.11 N) 2.0-mm (178.4 1.75 significantly lower than that Co-Cr (694.1 6.81 ( P Conclusion Within limitations study, results suggest both thicknesses evaluated less for insertion removal over 36-month period.