Hasan I, Heinemann F, Reimann S, Keilig L, Bourauel C
Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
Comput Methods Biomech Biomed Engin. 2011 Nov;14(11):979-85. doi: 10.1080/10255842.2010.503959. Epub 2011 Jun 24.
The aim of this study was to gain insight into the behaviour of the stresses and strains at the bone-implant interface of an implant-supported fixed partial prosthesis (FPP) in the premaxilla under immediate loading and osseointegrated conditions. Finite element models of a four-unit FPP were generated. An extreme condition was simulated, using only two immediately loaded implants in order to derive recommendations for possible clinical application. Straight and 20°-angled abutments and bonded or sliding contact between the bridge and abutment were simulated. In addition, two models were generated with two completely osseointegrated implants. A 150 N load to the prosthesis at a 45° angle to the long axis of each implant was applied. Minor differences were observed in implant displacements, stress and strain distributions of the two abutment designs. However, bone loading exceeded the physiological limits, including a risk of bone atrophy. A considerable decrease in implant displacements and bone loading was observed in the osseointegrated cases. An FPP supported by only two implants cannot be recommended for immediate loading.
本研究的目的是深入了解在上颌前部种植体支持的固定局部义齿（FPP）在即刻加载和骨结合条件下骨-种植体界面处应力和应变的行为。生成了一个四单位FPP的有限元模型。模拟了一种极端情况，仅使用两个即刻加载的种植体，以便为可能的临床应用得出建议。模拟了直基台和20°角基台以及桥体与基台之间的粘结或滑动接触。此外，还生成了两个具有两个完全骨结合种植体的模型。在与每个种植体长轴成45°角的方向上对义齿施加150 N的载荷。观察到两种基台设计在种植体位移、应力和应变分布方面存在微小差异。然而，骨负荷超过了生理极限，包括骨萎缩的风险。在骨结合的情况下，观察到种植体位移和骨负荷显著降低。不建议仅由两个种植体支持的FPP进行即刻加载。
