The experimental study of immediately implantation with different loads

Objective:To investigate the general stress distribution of immediately loading implants, we established an experimental implant model with different angled lateral loads. Methods:4 adult dogs were implanted with different angles and the 28 implants were immediately loaded. Specimens were aquired 1 and 3 months after the operation and an uncalcium technique was applied in the study. Osseointegration index (OI) and bone ingrowths fraction (BIF) were measured by quantitative histology and the data were statistically analyzed. The histological changes of the bone remodeling around implants were visible in the optical microscope. The general range and distribution of the stress around the implants were evaluated by three dimensional finite element. Implant length stress regression curve was made by SPSS10.0 software. Results:The experimental implant model with angled lateral load was successfully accomplished. None of 28 implants had been instable or fallen off and osseointegration occurred in nearly all specimens. The OI and BIF had significant difference(P<0.01). The outcome of three dimensional finite element indicates that the stress of 20 teams had significant difference compared to other teams(P<0.01). The stress distribution was the most reasonable compared to other teams. Conclusion:Loading angle is an important factor that can affect the results of clinic dental implants.