Abstract: Objective: To compare influences of attachment type and different implant sites on the stress distribution among all supporting structures. Methods: A three-dimensional finite element model of a short-implants-assisted removable partial denture was established to restore Kennedy class Ⅰ dentition defect, and nine experimental group models were constructed according to the implant positions (position A: the second premolar area, position B: the first molar area, position C: the second molar area) and attachment types (Brevis, Locator, and Magfit). A removable partial denture model was established as the control. The stress distribution of each component was analyzed, and the maximum von Mises stress values and displacement values were recorded. Results: Three-dimensional finite element models of short implant-assisted removable partial denture were established. Under vertical and oblique loads, the denture displacement was greater in the RPD group than in the experimental groups; under oblique loads, the denture displacement was greater in the Magfit groups than in the Brevis and Locator groups, while the implant-bone interface stress was smaller and the mucosa stress and cortical bone stress around the short implant were greater; the implant-bone interface stress and short implant stress were smaller, and the short implant stress was greater when the short implant was located at position C. Conclusion: Short implants-assisted removable partial dentures can significantly improve the retention and stability of the denture, and magnetic attachments are more beneficial to the long-term success of short implants. Position C is better suited for dispersion of occlusal forces.

Key words: short dental implants, attachment, implant-assisted removable partial dentures, dental implant position