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Background. Considerations about heat generation, wear, and corrosion due to some macrostructural bur components (e.g., cutting lips, rake angle, flute, and helix angle) have been widely reported. However, little is known about how the microstructural components of the implant drill surface can influence the implant drill lifetime and clinical performance. Aim. To investigate accurately the surface morphology of surgical bone drill, by means of multivariate and multidimensional statistical analysis, in order to assess roughness parameters able to predict the evolution of tribological phenomena linked to heat development, wear, and corrosion occurring in clinical use. Materials and Methods. The surfaces of implant drills approximately 2.0mm in diameter made by five manufacturers were examined by means of confocal microscope with white light laser interferometry, obtaining several surface roughness parameters. Statistical multivariate analysis based on discriminant analysis showed, for each cut-off, the parameters which discriminate the manufacturers. Results. The microstructural parameters used by discriminant analysis evidenced several differences in terms of drill surface roughness between the five manufacturers. Conclusions. The observed surface roughness difference of drills is able to predict a different durability and clinical performance especially in heat generation and wear onset.

Clinical Influence of Micromorphological Structure of Dental Implant Bone Drills