Geometric comparison of five interchangeable implant prosthetic retaining screws.
Eight geometric parameters of five interchangeable prosthetic retaining screws (#1-3i Implant Innovation-gold, #2-Impla-Med-gold, #3-Nobelpharma-gold, #4-3i Implant Innovation-titanium, and #5-Implant Support Systems-titanium) were recorded with an Amray 1000-B scanning electron microscope at x20 to x200 magnification. Five screws of each type were measured and eight parameters were evaluated: (A) diameter of head, (B) screw length, (C) thread pitch, (D) major diameter, (E) neck diameter (F) length of neck, (G) crest width, and (H) root width. The Nobelpharma-gold prosthetic retaining screws served as controls. The results revealed significant differences between the control and test screws in all parameters except parameters C and G (ANOVA, p < 0.05) and Duncan's multiple range test (significance level 0.05). On the basis of these differences, it was concluded that interchanging prosthetic retaining screws can introduce unknown variables in treating patients.
Jaarda
M J
MJ
Department of Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor.
Razzoog
M E
ME
Gratton
D G
DG
D000704:Analysis of Variance; D017267:Dental Prosthesis Design / Q000592:standards*; D017268:Dental Prosthesis Retention / Q000295:instrumentation* / Q000592:standards; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D006801:Humans; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties