초기 고정이 없는 임플란트의 골유착에 관한 동물실험 연구

Abstract

The primary stability of implants is an important factor to predict the osseointegration. This study evaluated the effect of poor primary stability on the osseointegration of implants. After 4 months teeth were extracted, implants were placed into the mandibular premolar areas of 6 adult mongrel dogs. To evaluate the initial healing response of bone around the implants without primary stability, implants with 3.3 mm diameter were inserted within 3.5 mm diameter bone hole at the premolar areas. In control group, implants with 3.3 mm diameter were inserted within 2.7 mm diameter at the premolar area. After the implants were inserted, the Periotestⓡ value (PTV, MEDIZINTECHNIK GULDEN, GERMANY) to measure the primary stability and the histologic findings to observe the new bone formation were analyzed at 2, 4 and 8 weeks. The results showed that PTV of experimental group was higher than that of control group at implantation. But 8 weeks later, the PTV of experimental group was similar with control group. In histologic results, the less primary stability in implant was, the later osseointegraion was occurred. Although primary stability was not obtained at initial placement, osseointegration was occurred at 8 weeks later. And the osseointegration of experimental group and control group was similar at 8 weeks later. In conclusion, this study suggests that the implant with poor initial stability could be osseointegrated as enough healing time passed.