Background: Implant primary stability is determined by screw characteristics and surgical
procedure. The aim of the present study was to evaluate, on a polyurethane model, the insertion
torque (IT), removal torque (RT), and resonance frequency analysis (RFA) of multi-scale roughness
dental implants of different diameters. Methods: Two implant sizes were tested on two polyurethane
blocks (20 pounds per cubic foot (PCF) and 30 PCF): 3.0 diameter and 13 mm length and 5.0 diameter
and 13 mmlength. The IT, RT, and RFA were assessed. Results: A significant difference of IT and
RTwaspresent in favor of wider implants at both polyurethane densities. No statistical difference
was present between the 5.0 diameter and 3.0 diameter implants at both polyurethane densities.
Astatistically increased RFA was reported for 5.0 implant 30 PCF polyurethane blocks. Conclusions:
Multi-scale roughness dental implants of both diameters showed high insertion torque and primary
stability on polyurethane blocks, which is valuable for implant loading protocols.