The Clinical Research And Three-dimensional Finite Element Analysis Of Two Different Forms Of Implant

Object:In this study, the effects of Frialit-2 implant and IMZ implant were evaluated retrospectively using radiological assessment criteria and the stress distribution of these two different types implants was analyzed using a three-dimensional finite element analysis. With these results, the effects of implant shape on the stress distribution around the interface of implant-bone were determined as a theoretical reference for implant design and clinical selection.Method: 1. 68 implants were placed, and the amount of bone loss around the implant was measured one week and half a year after the superstructure had been restored respectively. Finally, the independent t test was used to evaluate the effects of different implant shape on alveolar bone loss. 2. Frialit-2 implant and IMZ implant models were reconstructed on computer by the use of ANSYS software. Under the same condition, 200N force was loaded on the lingual side in perpendicular, oblique (45) and horizontal direction respectively to observe the stress distribution on the buccal, lingual, mesial and disto side of the interface of the implant-bone.Result: 1. There was no statistical significance difference between the bone losses of the two different types of implant (F=1.077, f=-1.802, p>0.05).2.The distributions of the Frialit-2 and IMZ were similar that the stress value was concentrated on the cortical bone area around the neck of the implant. 3. When loaded perpendicularly, the stress value of Frialit-2 is smaller than that of IMZ. The peak compressive value of Frialit-2 is 9.8N/mm2, which is smaller than that of IMZ. 4. But when loaded obliquely and horizontally, the peak compressive value of Frialit-2 is higher 4%and 4.4% than that of IMZ.Conclusion: 1. Shape factor has little effect on the bone loss around implant by comparing Frialit-2 and IMZ. 2. There is no obvious change on the stress distribution of the implant-bone interface as the change of the implant shape. 3. The effective compressive area is an important factor that makes Frialit-2 gain more bone support with less contact area. 4. In delay implantation, cylinder implant seems to be more suitable because it gain less compressive value when loaded in oblique and horizontal direction. 5. Frialit-2 is more suitable for immediate implant than IMZ, because it has a similar root-formed shape and stress value with IMZ.