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Abstract
Introduction
This study compared the strength of osseointegration as determined by the resistance to reverse torque rotation of three different hydroxyapatite coated implants in the rabbit femur model.
Materials and Methods
Three hydroxyapatite coated implants (HAPTITE), Tapered Screw-Vent (TSV) and BioTite-H - were used. A total of 40 implants were placed in the femur of 20 adult male rabbits. The animals were divided into two groups. In group A (n=10); one HAPTITE was placed into each right femur and one TSV was placed into each left femur. In group B (n=10); one HAPTITE was placed into each right femur and one BioTite-H was placed into each left femur. Five rabbits of each group were sacrificed at 4 and 8 weeks. The implants were removed by reverse torque rotation using a digital torque-measuring device. A total of 40 implants in 20 rabbits were used for the removal torque measurements.
Results
In the Group A, 4 weeks after implant placement, the mean removal torque for the HAPTITE and TSV was 70.7±31.6 N cm and 28.9±15.1 N cm, respectively. Eight weeks after implant placement, the mean removal torque for the HAPTITE and TSV was 87.9±26.2 N cm and 54.9±22.4 N cm, respectively. In the Group B, 4 weeks after implant placement, the mean removal torque for the HAPTITE and BioTite-H was 58.0±29.6 N cm and 37.7±14.1 N cm, respectively. Eight weeks after implant placement, the mean removal torque for the HAPTITE and BioTite-H was 91.4±47.1 N cm and 30.8±9.8 N cm. HAPTITE showed a higher removal torque than the other implants.
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Fig. 1.
Digital torque meter used to measure the peak value of resistance to reverse torque rotation in N cm.
Fig. 2.
Mean removal torque values (N cm) of implants 4 weeks after implantation.(TSV: Tapered Screw-Vent)
Fig. 3.
Mean removal torque values (N cm) of implants 8 weeks after implantation.(TSV: Tapered Screw-Vent)
Table 1.
Experimental design
| Right femur (n=20) | Left femur (n=20) | Number of Rabbits | |
|---|---|---|---|
| Group A | HAPTITE (n=10) | TSV (n=10) | 10 |
| Group B | HAPTITE (n=10) | BioTite-H (n=10) | 10 |
Table 2.
Removal torque values in Newton’s
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