Objective. The aim of this study was to assess the influence of the interim plant distance on the implant primary stability (ISQ)\nby Resonance Frequency Analysis (RFA). Method. Forty-five implants were placed in the mandible of human cadavers and 108 in\nartificial bone substrates in the form of polyurethane foam blocks. Primary implant stability was successively measured first by\nRFA immediately after the placement of the first implant (A) and then after two other implants (B and C) proximal and distal to\nthe first implant. The interim plant distances were defined from 1 to 6mm and the three primary stability values measured were\ncompared. Results. On the mandibles, no correlation was observed between the interim plant distances and primary stability. On\nthe polyurethane foam block, the primary stability of implant A increased significantly (
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