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KMID : 0355620110370010049
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Journal of Korean Association of Oral and Maxillofacial Surgeons
2011 Volume.37 No. 1 p.49 ~ p.53
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Comparative study of removal torque of 3 different hydroxyapatite coated implants in the femur of rabbits
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Kim Sang-Soo
Lee Ju-Hyoung
Yu Seok-Hyun
Lee Hyung-Ju
Moon Jee-Won
Park In-Sook
Sohn Dong-Seok
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Abstract
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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.
Conclusion: These results suggest that HAPTITE increases the strength of osseointegration significantly as determined by the resistance to reverse torque rotation.
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KEYWORD
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Torque, Hydroxyapatite, Dental implants, Osseointegration, Rabbits
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