It is well known that the osseointegration of the commercially pure titanium (c.p. Ti) dental implant is improved when the metal is shot blasted in order to increase its surface roughness. This roughness is colonised by bone, which improves implant fixation. However, shot blasting also changes the chemical composition of the implant surface because some shot particles remain adhered on the metal. The c.p. Ti surfaces shot blasted with different materials and sizes of shot particles were tested in order to determine their topographical features (surface roughness, real surface area and the percentage of surface covered by the adhered shot particles) and electrochemical behaviour (open circuit potential, electrochemical impedance spectroscopy and cyclic polarisation). The results demonstrate that the increased surface area of the material because of the increasing surface roughness is not the only cause for differences found in the electrochemical behaviour and corrosion resistance of the blasted c.p. Ti. Among other possible causes, those differences may be attributed to the compressive residual surface stresses induced by shot blasting. All the materials tested have an adequate corrosion and electrochemical behaviour in terms of its possible use as dental implant material.
Bibliographical noteFunding Information:
The authors would like to acknowledge Dr. Susanna Castel from the Scientific and Technical Services (Confocal Microscopy and Cellular Micromanipulation Facility) of the Universitat de Barcelona for her help in the confocal microscopy study; Dr. Carlos Sa from the Centro de Materiais da Universidade do Porto for his help in the scanning electron miscrocopy and image analysis study; Klockner Dental Implants, S.L., and Materias Primas Abrasivas, S.L. (MPA) for their technical help; and the Comisión Interministerial de Ciencia y Tecnologı́a (Grant No 2000-1736) for its financial support.
- Dental implant
- Electrochemical impedance spectroscopy
- Shot blasting