Abstract
This study was conducted to provide an understanding of the biomechanical behavior ofdifferent diameters MDIs and compare it with conventional diameter implants when supportingan overdenture . Three different models were designed .The first model has two standard diameterimplants (3.8x12mm) (D1), the second (D2) has 2 mini-dental implants (2.4x12mm) and the thirdmodel (D3) has 2 of ultra-small diameter (1.8 x 12mm) all implants were placed at canines region.3D finite elements stress analysis was performed to evaluate biomechanical situation in both theimplants and the peri-implant bone under vertical and oblique loading of the overdentures. It can beconcluded that the stress values affecting the peri-implant bone and the implants are reciprocal todental implant diameter and the use of MDIs as overdenture abutments should be limited to caseswith limited bone quantity.
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