Are Implant Threads Important for Implant Stability? An In Vitro Study Using Low-Density Polyurethane Sheets

Different strategies are known to improve implant primary stability (PS) and the bone-to-implant contact in post-extractive conditions, such as macro-geometry of screws apical threads, which can enhance mechanical characteristics. In any case, role area design maintaining or improving PS, especially low-quality bone, still remains unclear. Thus, present study aimed at evaluating vitro Insertion Torque (IT), Removal (RT), Resonance Frequency Analysis (RFA) different threads a cylindrical (EE) three conical implants (T3, TAC, Intra-lock) inserted simulated post-extraction conditions on low-density polyurethane foams 10 20 pounds per cubic foot (PCF), with without addition cortical sheet 30 PCF density. The IT, RT, RFA values all tested were directly proportional density presence sheet, but TAC Intra-lock implants, had latest-generation thread design, always showed significantly higher (e.g., IT: 18.6 Ncm, RT: 10.8 13.7 mean: 46 43 ISQ, for Intra-lock, respectively). particular, also reached highest lowest-density foam (19 ISQ). conclusion, demonstrated that designs macro-geometries could play key determining PS polyurethane-implant artificial bone.