title: A histomorphometric and removal torque study of screw-shaped titanium implants with three different surface topographies.
abstract: Screw-shaped implants with 3 different surface topographies, evidenced visually as well as numerically with an optical profilometer, were inserted in rabbit bone. After a healing period of 12 weeks, a statistically significant higher removal torque was needed to unscrew screws blasted with 25-microns TiO2 particles and screws blasted with 75-microns particles of AI2O3 compared with screws with a turned surface. The histomorphometric evaluation demonstrated a higher percentage of bone-to-metal contact for implants blasted with 25-microns particles of TiO2 compared with the as-machined implants. A greater surface area of bone in threads was found for the turned screws compared with screws blasted with 25-microns TiO2 particles. In the short-term follow-up, there was a better fixation of implants with an average surface roughness of 0.9-1.3-microns and with a homogeneous surface structure than of implants with an average surface roughness of 0.4 microns and with a clear direction of the surface pattern.
authors.affiliation: Biomaterials Group, Department of Handicap Research, University of Göteborg, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Wennerberg
authors.forename: T
authors.initials: T
authors.lastname: Albrektsson
authors.forename: B
authors.initials: B
authors.lastname: Andersson
authors.forename: J J
authors.initials: JJ
authors.lastname: Krol
mesh_terms: D000537:Aluminum Oxide; D000818:Animals; D001863:Bone Screws; D005269:Femur; D005500:Follow-Up Studies; D008297:Male; D016348:Osseointegration; D019736:Prostheses and Implants; D011474:Prosthesis Design; D011817:Rabbits; D012399:Rotation; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013977:Tibia; D014025:Titanium
chemical_list: C009495:titanium dioxide; D014025:Titanium; D000537:Aluminum Oxide