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Results : Biomechanical effects of offset placement of dental implants in the edentulous posterior mandible [1]

Results : Biomechanical effects of offset placement of dental implants in the edentulous posterior mandible [1]

author: Yuta Shimura, Yuji Sato, Noboru Kitagawa, Miyuki Omori | publisher: drg. Andreas Tjandra, Sp. Perio, FISID

Figures 8 and 9 and Tables 2 and 3 show the results for the compressed displacement of the implants, by loading site, during the application of a 100-N vertical load in each of the models.

In all placements, the compressed displacement in the experimental models and FEA models was greatest with buccal loading and smallest with central loading at the three loading points. For both the experimental models and the FEA models, the compressed displacement during buccal loading with straight placement was significantly greater than that with the L-offset (P < 0.05). The compressed displacement during lingual loading with straight placement was significantly greater than that with the B-offset (P < 0.05).

Figure 10 shows the results for the three-dimensional displacement of the implants, by loading site, during the application of a 100-N vertical load. Displacement in the buccolingual direction (x-axis direction) during buccal loading exhibited movement such that the implant neck was displaced to the buccal side, the implant tip was displaced to the lingual side, and the implant body rotated and tilted to the loading side. There was little displacement of the implant tip during lingual loading, while the implant body showed movement with the displacement to the lingual side. The least displacement was observed during central loading. Displacement in the mesiodistal direction (y-axis direction) was such that the three implant bodies were rotated and tilted distally at all three loading sites. The three-dimensional displacement in the vertical direction (z-axis direction) was such that in all three loading sites, no. 36 was displaced the most, and the more mesial the implant body, the lesser the displacement was, and the distal parts sank. The least displacement was during central loading; buccal loading and lingual loading exhibited similar displacements. Between placements, similar trends were found, and differences in implant placement were not found to affect the three-dimensional displacement or the direction of displacement.

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