Hamedirad Fahimeh, Ghaffari Tahereh, Mehanfar Navideh
Department of Prosthodontics, Babol University of Medical Sciences, Babol, Iran.
Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2018 Fall;12(4):258-263. doi: 10.15171/joddd.2018.040. Epub 2018 Dec 19.
For esthetic considerations in anterior regions, abutments with high-strength ceramics such as alumina and zirconia have been developed as substitutes for titanium abutments. The present study was designed to investigate the distribution of stress in prosthesis and bone components of an implant-supported FPD with different abutments by using 3D finite element analysis. Ceramic FPDs were made from the canine to the upper left second premolar with titanium fixtures. In order to investigate the stress distribution, forces of 100 and 300 N were applied at angles of 0, 15 and 35 degrees to the central fossa of the second premolar and pontic, as well as the cingulum of the canine crown. Force loading was static. After analyzing the mechanical properties of the materials, boundary conditions and loading were performed according to the existing averages, and subsequently, the results obtained from this analysis were analyzed. The highest level of stress was observed in the distal crest of the posterior implant (23.20 MPa) under lateral forces (15 and 35 degrees) in a model with both titanium abutments. Lateral forces induced higher accumulation of stress in the implant and surrounding bone, while abutment change did not affect the distribution of stress.
出于前牙区美学考虑，已开发出氧化铝和氧化锆等高强度陶瓷基台作为钛基台的替代品。本研究旨在通过三维有限元分析，研究不同基台的种植体支持固定局部义齿在修复体和骨部件中的应力分布。陶瓷固定局部义齿由犬齿至左上第二前磨牙采用钛种植体制作。为了研究应力分布，在第二前磨牙中央窝、桥体以及犬牙冠舌隆突处以0°、15°和35°的角度施加100 N和300 N的力。力加载为静态。在分析材料的力学性能后，根据现有平均值进行边界条件和加载，随后对该分析得到的结果进行分析。在双侧钛基台模型中，侧向力（15°和35°）作用下，后牙种植体远中嵴处观察到最高应力水平（23.20 MPa）。侧向力在种植体及其周围骨中引起更高的应力积聚，而基台的改变不影响应力分布。
