2020 Volume 33 Issue 1 Pages 45-51
Several previous studies have demonstrated that platform-switching is effective for preventing the resorption of peri implant bone and its surrounding soft tissue. This approach requires two adjacent implants at least 3 mm apart. This study aimed to clarify the effect of platform-switching on the bone between two adjacent implants when the inter-implant distance is shorter than 3 mm.
In adult macaques (Macaca fascicularis), two adjacent implants that were 1.5 mm (mesiodistal distance) apart were placed in close proximity to the mandibular posterior tooth site, and temporary abutments were used such that one was a platform switching implant and the other was a non-platform-switching implant.
After 8 weeks, the tissue between the implants was observed under a scanning electron microscope and an optical microscope. In the non-platform-switching group, the alveolar bone was resorbed in the horizontal and vertical directions near the platform. However, in the platform-switching group, the alveolar bone was vertically preserved near the platform, and a new bone was horizontally formed ; the range considered to represent the infiltration of inflammatory cells was further reduced.
These results suggest that the use of platform-switching may help to preserve healthy peri-implant tissue even when the distance between two adjacent implants is less than 3 mm.