Ciftçi Y, Canay S
Department of Prosthodontics, Faculty of Dentistry, University of Hacettepe, Ankara, Turkey.
Int J Oral Maxillofac Implants. 2000 Jul-Aug;15(4):571-82.
In this study, the effect of various materials used in fabricating superstructures for implant-retained fixed partial dentures on stress distribution around implant tissues was investigated. Five different mathematical models consisting of 11,361 nodes and 54,598 elements were constructed to study porcelain, gold alloy, composite resin, reinforced composite resin, and acrylic resin veneering materials using the 3-dimensional finite element analysis method. MARC K7.2/Mentat 3.2 software was used for the analysis. Reference points were determined on the cortical bone, where perpendicular, oblique, and horizontal forces were applied. Stress values created by oblique and horizontal forces appeared to be higher than those created by vertical forces. Stress seemed to be concentrated at the cortical bone around the cervical region of the implant. Gold alloy and porcelain produced the highest stress values in this region. Stresses created by acrylic resin and reinforced composite resin were 25% and 15% less, respectively, than porcelain or gold alloy. Porcelain and gold alloy produced stress values at the lingual implant sites that reached the ultimate strength values of the cortical bone.
在本研究中，调查了用于制作种植体支持的固定局部义齿上部结构的各种材料对种植体周围组织应力分布的影响。使用三维有限元分析方法构建了五个不同的数学模型，包括11361个节点和54598个单元，以研究陶瓷、金合金、复合树脂、增强复合树脂和丙烯酸树脂贴面材料。分析使用MARC K7.2/Mentat 3.2软件。在皮质骨上确定参考点，并在这些点上施加垂直、斜向和水平力。斜向和水平力产生的应力值似乎高于垂直力产生的应力值。应力似乎集中在种植体颈部区域周围的皮质骨处。金合金和陶瓷在该区域产生的应力值最高。丙烯酸树脂和增强复合树脂产生的应力分别比陶瓷或金合金少25%和15%。陶瓷和金合金在种植体舌侧部位产生的应力值达到了皮质骨的极限强度值。
