Effects of buccal bi‐cortical anchorages on primary stability of dental implants: a numerical approach of natural frequency analysis

Abstract

The purpose of this study was to investigate influences of buccal bi-cortical anchorages on natural frequency (NF) values of dental implants in different diameters utilizing the three-dimensional finite element method. Three degrees of buccal bi-cortical engagements were generated in D2 and D3 bone quality models, which were 0-mm engagement (i.e. implants just had contact with the buccal cortex), 0.5-mm (i.e. implants were penetrated into the buccal cortex by 0.5 mm) and 1.0-mm engagement, while only 0- and 0.5-mm engagement were simulated in D4 bone models. The uni-cortical engagement was set as the control. By the modal analysis, NF values of bending and axial vibration mode were computed as a function of different bi-cortical engagements. The results showed that buccal bi-cortical anchorages significantly enhanced bending and axial NF values. The increasing rates resulting from 0.5-mm engagement ranged from 10.5 to 42.3%, with a mean of 24.3%. From 0- to 0.5-mm engagement, the NF values maintained an increasing trend, and from 0.5- to 1.0-mm engagement, the values levelled off or even decreased. In 0.5- and 1.0-mm engagement models, increasing implant diameter resulted in small increases of NF values. In conclusion, buccal bi-cortical anchorages could significantly increase both bending and axial NF values of dental implants, but extra-buccal cortical bone engagement could not produce considerable incremental increases of NF values as anticipated. Increasing implant diameter could result in limited increases of NF values in case of implants being bi-cortically anchored.

Influence of Thread Pitch, Helix Angle, and Compactness on Micromotion of Immediately Loaded Implants in Three Types of Bone Quality: A Three-Dimensional Finite Element Analysis

“…Irrespective of the vertical or horizontal load, the comprehensive relative displacement of the implants gradually increased along with the reduction in bone density (D2 > D3 > D4). This finding is in agreement with earlier work [43]. …”

Morphometric characteristics of cortical and trabecular bone in atrophic edentulous mandibles

“…) and for additional cortical anchorage at the buccal or lingual aspect with a desired engagement of the cortical layer of 0.5–1 mm (Wang et al. ). Regarding our results, the reported higher primary implant stability in the anterior mandible (Mesa et al.…”

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“…Wang et al investigated the influence of the buccal (lingual) type of bi-cortical anchorage on the primary implant stability using 3D FE models, and further clarified the relationship between the primary stability and various bi-cortical engagements. They assumed a frictional contact to simulate the initial conditions of the implant-bone interface after implantation [21]. Thus, the in vitro model can be regarded as the immediate implantation situation, and the implant-bone interface is a non-integrated (not bonded) surface.…”