Hasan I, Bourauel C, Keilig L, Stark H, Lückerath W
Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Welschnonnenstr. 17, 53111 Bonn, Germany.
Ann Anat. 2015 May;199:43-51. doi: 10.1016/j.aanat.2014.12.001. Epub 2015 Jan 20.
Analysing the influence of implant splinting and its relation to different framework materials is a complex issue. The stiffness of framework materials and the overload of the implant system directly affect the final transferred load of the bone around implants. A finite element model of a long-span cementable implant-supported fixed prosthesis was created. Three materials were analysed for the framework: Titanium, gold alloy, and zirconia. The connection screws were first preloaded with 200 N. Two loading conditions were studied: The implant at the molar region was first loaded without splinting to the framework, and in the second condition, the implant was splinted to the framework. A total force of 500 N and 1000 N in 30° from the long axis of the framework were applied in buccal or distal direction on the implant system. The stresses and strains within the framework materials, implant system, and bone bed around the supporting implants were analysed. Loading the implant distally was associated with high stresses within the implant system in comparison to buccal loading. By splinting the implant, the stress in the implant system was reduced from 5393 MPa to 2942 MPa. Buccal loading of the implant was more critical than the distal loading. In the splinted condition of the implant, the stresses in the cortical bone were reduced from 570 MPa to 275 MPa.
分析种植体夹板固定的影响及其与不同基托材料的关系是一个复杂的问题。基托材料的刚度和种植体系统的过载直接影响种植体周围骨组织最终承受的载荷。建立了一个大跨度可粘结种植体支持的固定义齿的有限元模型。对三种基托材料进行了分析：钛、金合金和氧化锆。连接螺钉首先预加载200N。研究了两种加载条件：首先在不与基托夹板固定的情况下对磨牙区种植体加载，在第二种情况下，种植体与基托夹板固定。在与基托长轴成30°角的方向上，分别向种植体系统施加500N和1000N的总力，方向为颊侧或远中。分析了基托材料、种植体系统以及支持种植体周围骨床内的应力和应变。与颊侧加载相比，向远中方向加载种植体时，种植体系统内的应力较高。通过将种植体夹板固定，种植体系统内的应力从5393MPa降低到2942MPa。种植体颊侧加载比远中加载更关键。在种植体夹板固定的情况下，皮质骨内的应力从570MPa降低到275MPa。
