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South African Journal of Surgery

On-line version ISSN 2078-5151

S. Afr. j. surg. vol.46 n.1 Cape Town Feb. 2008

 

MAXILLOFACIAL SURGERY

 

Torque removal force for osseointegrated implants - two experimental studies

 

 

J. F. LownieI; P. A. Betts, M.DentII; R. S. Bryant, M.DentIII; P. Cleaton-JonesIV

IPH.D., F.C.M.F.O.S. (S.A.). Divisions of Maxillofacial and Oral Surgery, and Experimental Odontology, University of the Witwatersrand, Johannesburg
II(M.F.O.S.), F.C.M.F.O.S. (S.A.). Divisions of Maxillofacial and Oral Surgery, and Experimental Odontology, University of the Witwatersrand, Johannesburg
III(M.F.O.S.), F.C.M.O.F.S. (S.A.). Divisions of Maxillofacial and Oral Surgery, and Experimental Odontology, University of the Witwatersrand, Johannesburg
IVD.SC. (DENT), F.C.D. (S.A.). Divisions of Maxillofacial and Oral Surgery, and Experimental Odontology, University of the Witwatersrand, Johannesburg

 

 


ABSTRACT

OBJECTIVE: To introduce a rabbit-based model for testing the torque removal force (TRF) of implants and to compare the TRF of a series of titanium implants.
METHODS: Two experiments were performed at the University of the Witwatersrand. In the first, a Swedish- (SSM-N) or a South African-manufactured (SSM-S) implant was implanted into the tibiae of 12 rabbits and the TRF measured at 1, 3 and 6 months. In the second experiment, the TRF of 4 South African-manufactured titanium implants in the tibia or femur of 32 rabbits were compared at 3 and 6 weeks. The implants were: 1 threaded machined (SSM-S), and 3 surface-enhanced - 1 threaded (SLA), 1 threaded tapered (MTT) and 1 pitted (RI).
RESULTS: In experiment 1, TRF increased significantly with time (p<0.05) but there was no significant difference between TRF for the South African and Swedish machined-surface implant types. In experiment 2, the TRF of the MTT implant was significantly greater (p<0.0001) than the other 3 types, which did not differ significantly from each other. Time had no significant effect.
CONCLUSION: In an internationally used rabbit-based model, South African and Swedish machined-surface titanium implants were equivalent; surface-enhanced implants produced higher TRF, and a tapered implant showed the highest TRF.


 

 

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