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http://dx.doi.org/10.4047/jkap.2013.51.4.315

Effect of cyclic loading on axial displacement of abutment into implant with internal tapered connection: a pilot study  

Seol, Hyon-Woo (Department of Prosthodontics, School of Dentistry, Seoul National University)
Heo, Seong-Joo (Department of Prosthodontics, School of Dentistry, Seoul National University)
Koak, Jai-Young (Department of Prosthodontics, School of Dentistry, Seoul National University)
Kim, Seong-Kyun (Department of Prosthodontics, School of Dentistry, Seoul National University)
Han, Chong-Hyun (Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.51, no.4, 2013 , pp. 315-322 More about this Journal
Abstract
Purpose: To evaluate the axial displacement of implant-abutment assembly after cyclic loading in internal tapered connection system. Materials and methods: External butt-joint connection implant and internal tapered connection implant were connected with three types of abutment for cement-retained prostheses, i.e. external type abutment (Ext group), internal tapered 1-piece abutment (Int-1 group), and internal tapered 2-piece abutment (Int-2 group). For each group, 7 implants and abutments were used. The implantabutments assemblies were clamped into the implant holder for vertical loads. A dynamic cyclic loading was applied for $150{\pm}10N$ at a frequency of 4 Hz. The amount of axial displacement of the abutment into the implant was calculated at each cycle of 0, 5, 10, 50, 100, 1,000, 5,000, and 10,000. A repeated measures analysis of variance (ANOVA) for the overall effect of cyclic loading and the pattern analysis by linear mixed model were used for statistical analysis. Differences at P<.05 were considered statistically significant. Results: The mean axial displacement after 10,000 cycles were $0.714{\pm}0.488{\mu}m$ in Ext group, $5.286{\pm}1.604{\mu}m$ in Int-1 group, and $11.429{\pm}1.902{\mu}m$ in Int-2 group. In the pattern analysis, Int-1 and Int-2 group showed continuous axial displacement at 10,000 cycles. There was no declining pattern of axial displacement in the Ext group. Conclusion: The pattern of linear mixed model in Ext group showed no axial displacement. There were continuous axial displacements in abutment-implant assemblies in the Int-1 and Int-2 group at 10,000 cycles. More axial displacement was found in Int-2 group than in Int-1 group.
Keywords
Dental implant-abutment design; Internal tapered connection; Cyclic loading; Axial displacement; Settling effect;
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