The aim of this investigation was to compare the effect of the thread pitch, thread profile and the surface morphology on the primary stability of implants of a different diameter. Eighty test specimens of dental implants were inserted into 16 untreated pig ribs, as the maximum insertion torque (MIT), periotest values (PTV) and implant stability quotient (ISQ) were measured. Considering the results, we concluded that the higher thread profile, even with a wider thread pitch, affects the primary stability more than the rougher surface of the implants.
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