原著
機能下における表面処理が異なるインプラント体周囲の骨と微細血管構築
2007 年 20 巻 1 号 p. 32-40
詳細
2007 年 20 巻 1 号 p. 32-40
For the long-term functioning of an implant,it is important that the established peri-implant bone is maintained. The formation and absorption of the bone are related to the microvasculature. Therefore, we investigated the sequential changes in bone percentage and vascular percentage around rough- and smooth-surfaced implants having the same structure and under occlusal loading. We additionally elucidated the implant that showed long-term functionality.
In this study, a rough-surfaced implant produced by blasting (BI) and a smooth-surfaced implant produced by machining (MI) were used.These implants were fixed in the molar part of the mandible of three monkeys and were maintained under non-loading conditions for 14 weeks. The implants were loaded after setting up a super-structure at 14 weeks following fixation. At 14 weeks under the non-loading conditions and at 1, 4, 12, and 24 weeks under the loading conditions, bone and microvasculature specimens were prepared by the plastic injection method and were observed under a scanning electron microscope. The bone percentage and the vascular percentage in the 500-μm area surrounding each implant were calculated using image processing software.
For each week, the bone percentage of MI was higher than that of BI. The former did not change during 0-12 weeks after the loading and decreased during 12-24 weeks. The latter did not change during 0-4 weeks after the loading, increased during 4-12 weeks, and decreased remarkably during 12-24 weeks. For each week, the vascular percentage of MI was higher than that of BI. The former did not change during 0-4 weeks after the loading,increased during 4-12 weeks, and did not change during 12-24 weeks. The latter did not change during 0-4 weeks, increased during 4-12 weeks, and increased further during 12-24 weeks.
From the result that the bone percentage of MI was higher than that of BI until 24 weeks after the loading, it was suggested that the peri-implant bone of MI was maintained for a longer time than that of BI.
