Oxidized, bioactive implants are rapidly and strongly integrated in bone. Part 1--experimental implants.
OBJECTIVE
The study presented was designed to investigate the speed and the strength of osseointegration of oxidized implants at early healing times in comparison which machined, turned implants.


METHODS
Screw-shaped titanium implants were prepared and divided into two groups: magnesium ion incorporated, oxidized implants (Mg implants, n=10) and machined, turned implants (controls, n=10). Mg implants were prepared using micro-arc oxidation methods. Surface oxide properties of implants such as surface chemistry, oxide thickness, morphology/pore characteristics, crystal structures and roughness were characterized with various surface analytic techniques. Implants were inserted into the tibiae of ten New Zealand white rabbits. After a follow-up period of 3 and 6 weeks, removal torque (RTQ), osseointegration speed (DeltaRTQ/Deltahealing time) and integration strength of implants were measured. Bonding failure analysis of the bone-to-implant interface was performed.


RESULTS
The speed the and strength of osseointegration of Mg implants were significantly more rapid and stronger than for turned implants at follow-up periods of 3 and 6 weeks. Bonding failure for Mg implants dominantly occurred within the bone tissue, whereas bonding failure for turned implants mainly occurred at the interface between implant and bone.


CONCLUSIONS
Oxidized, bioactive implants are rapidly and strongly integrated in bone. The present results indicate that the rapid and strong integration of oxidized, bioactive Mg implants to bone may encompass immediate/early loading of clinical implants.
Sul
Young-Taeg
YT
Department of Biomaterials/Handicap Research, Institute for Surgical Sciences, Göteborg University, Box 412, S-405 30 Göteborg, Sweden. young-taeg.sul@hkf.gu.se
Jeong
Yongsoo
Y
Johansson
Carina
C
Albrektsson
Tomas
T
D000818:Animals; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003461:Crystallography; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D004563:Electrochemistry; D004577:Electron Probe Microanalysis; D008274:Magnesium / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D016348:Osseointegration / Q000502:physiology*; D010084:Oxidation-Reduction; D016062:Porosity; D011817:Rabbits; D013314:Stress, Mechanical; D013499:Surface Properties; D013977:Tibia / Q000601:surgery / Q000648:ultrastructure; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D019415:Torque; D014945:Wound Healing / Q000502:physiology
D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D003764:Dental Materials; D014025:Titanium; D008274:Magnesium