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Histomorphometric and removal torque analysis for TiO 2 hyphen;blasted titanium implants. An experimental study on dogs.
Author(s) -
Gotfredsen Klaus,
Nimb Lars,
Hjörtinghansen Erik,
Jensen Jørgen Steen,
Holmén Anders
Publication year - 1992
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1034/j.1600-0501.1992.030205.x
Subject(s) - implant , titanium , materials science , dentistry , osseointegration , surface roughness , biomedical engineering , orthodontics , medicine , composite material , metallurgy , surgery
The aim of the present study was to compare the anchorage of TiO 2 ‐blasted screw and cylindrical implants with conventionally used machine‐produced screw and cylindrical implants inserted immediately in extraction sockets on dogs. 6 adult mongrel dogs had 3rd and 4th mandibular premolars extracted bilaterally and 24 commercial pure titanium implants were placed immediately in extraction sockets and covered with mucoperiosteum. Each dog had inserted 4 implants: 1 screw implant and 1 cylindrical implant blasted with titanium‐dioxide‐particles; 1 screw implant and 1 cylindrical implant with machine‐produced (m.p.) surface (controls). After a healing period of 12 weeks, 16 implants from 4 animals were used for removal torque test, which demonstrated that significantly higher removal torque force was needed to unscrew the implants blasted with titanium‐dioxide‐particles, than the normal m.p. implants. The medians for the TiO 2 ‐blasted screw and cylindrical implants were > 150 Ncm and 10.5 Ncm, respectively, while the values for the m.p. implants were 60 Ncm and 35 Ncm, respectively. The SEM investigation demonstrated a high irregularity of the TiO 2 ‐blasted surface compared to the machined surface. The R, and R, values for surface roughness were higher for the TiO 2 ‐blasted implants than for the normal m.p. implants. Histomorphometrically, the arithmetic mean of the direct bone‐implant contact fraction was 69%. There was no significant difference in direct bone‐implant contact length fraction between TiO 2 ‐blasted implants and the control implants. The implants blasted with titanium‐dioxide‐particles in this study showed a better anchorage than implants with a machine‐produced surface. The screw implants showed a better anchorage than the cylindrical implants.