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KMID : 0362420130510040315
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Journal of Korean Academy of Prosthodontics
2013 Volume.51 No. 4 p.315 ~ p.322
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Effect of cyclic loading on axial displacement of abutment into implant with internal tapered connection: a pilot study
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Seol Hyon-Woo
Heo Seong-Joo
Koak Jai-Young
Kim Seong-Kyun
Han Chong-Hyun
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Abstract
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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 ± 10 N 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 ± 0.488 ㎛ in Ext group, 5.286 ± 1.604 ㎛ in Int-1 group, and 11.429 ± 1.902 ㎛ 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.
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KEYWORD
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Dental implant-abutment design, Internal tapered connection, Cyclic loading, Axial displacement, Settling effect
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