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3D evaluation of implant-abutment microgap after thermodynamic cycling: A Pilot Study

Purpose: To analyze three-dimensionally the micro-gap variation between hybrid abutment crowns and internal hybrid-connected implants with different taper angles before and after thermodynamic loading. Materials and Methods: Three groups were formed with 5 implants with each implant systems have different conical connection angle (15° Straumann Bone Level Implant STR , 8° GC AADVA Implant AAD and 11° Astra-Tech OsseoSpeed EV AST). A total of 15 hybrid abutment-crowns were fabricated by CAD/CAM system for implants which have different hybrid conical connection designs from polymethylmethacrylate (PMMA) blocks. The volume of the microgap value at the implant-abutment connection interface was measured before and after the thermodynamic cycle. The measurements were made by using 3-dimensional images obtained with scanning the samples with micro CT at both time points, and comparisons between groups (Kruskal-Wallis [KW]) were performed. Results: Minimum mean microgap value (%2,71) was observed in the STR group before aging. The largest mean microgap value (%9,59) belonged to the AST group. It was determined that the micro gap values of all groups increased after aging. After aging, the minimum mean microgap value (%3,16) was determined in the STR group again. There was a significant difference between the groups in terms of the increased micro gap value (KW: P = .003) (AST>AAD>STR). Conclusions: The microgaps between hybrid abutment crowns and implants increased after thermodynamic cycling. The geometry of the internal connection can affect the microgap variation.

Tuğçe Çetin
Marmara University Faculty of Dentistry
Turkey

Umut Aslan
Marmara University Faculty of Dentistry
Turkey

 


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