Journal List > J Korean Assoc Oral Maxillofac Surg > v.37(1) > 1032499

Kim, Lee, Yu, Lee, Moon, and Sohn: Comparative study of removal torque of 3 different hydroxyapatite coated implants in the femur of rabbits

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.

Conclusion

These results suggest that HAPTITE increases the strength of osseointegration significantly as determined by the resistance to reverse torque rotation.

References

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Fig. 1.
Digital torque meter used to measure the peak value of resistance to reverse torque rotation in N cm.
jkaoms-37-49f1.tif
Fig. 2.
Mean removal torque values (N cm) of implants 4 weeks after implantation.(TSV: Tapered Screw-Vent)
jkaoms-37-49f2.tif
Fig. 3.
Mean removal torque values (N cm) of implants 8 weeks after implantation.(TSV: Tapered Screw-Vent)
jkaoms-37-49f3.tif
Table 1.
Experimental design
  Right femur (n=20) Left femur (n=20) N Number of Rabbits
Group A HAPTITE (n=10) TSV (n=10) 10
Group B HAPTITE (n=10) BioTite-H (n=10) 10

(TSV: Tapered Screw-Vent)

Table 2.
Removal torque values in Newton's
Group Weeks Implant Removal torque (N cm) Mean±SD
A 4 HAPTITE 121.0 63.5 40.5 50.0 78.5 70.7±31.6
    TSV 50.0 8.5 34.0 25.0 27.0 28.9±15.1
  8 HAPTITE 55.0 114.5 66.5 109.0 94.5 87.9±26.2
    TSV 36.5 72.5 46.5 84.5 34.5 54.9±22.4
B 4 HAPTITE 47.5 108.5 32.0 56.5 45.5 58.0±29.6
    BioTite-H 39.5 53.0 14.5 42.0 39.5 37.7±14.1
  8 HAPTITE 36.5 86.5 153.0 122.5 58.5 91.4±47.1
    BioTite-H 29.5 44.5 33.0 17.0 30.0 30.8±9.8

(SD: standard deviation, TSV: Tapered Screw-Vent)

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