Surface Damage on Dental Implants with Release of Loose Particles after Insertion into Bone

BackgroundModern dental implants present surface features of distinct dimensions that can be damaged during the insertion procedure into bone. PurposeThe aims of this study were (1) to quantify by means of roughness parameters the surface damage caused by the insertion procedure of dental implants and (2) to investigate the presence of loose particles at the interface. Materials and MethodsThree groups of dental implants representing different surface topographies were inserted in fresh cow rib bone blocks. The surface roughness was characterized by interferometry on the same area before and after the insertion. Scanning electron microscopy (SEM)-back-scattered electron detector (BSD) analysis was used to identify loose particles at the interface. ResultsThe amplitude and hybrid roughness parameters of all three groups were lower after insertion. The surface presenting predominance of peaks (S-sk [skewness]>0) associated to higher structures (height parameters) presented higher damage associated to more pronounced reduction of material volume. SEM-BSD images revealed loose titanium and aluminum particles at the interface mainly at the crestal cortical bone level. ConclusionsShearing forces during the insertion procedure alters the surface of dental implants. Loose metal particles can be generated at bone-implant interface especially around surfaces composed mainly by peaks and with increased height parameters.