Chen Ye, Han Dong-wei, Xu Qi-hua
Department of Stomatology, Tongji Hospital of Tongji University, Shanghai 200065, China.
Shanghai Kou Qiang Yi Xue. 2006 Apr;15(2):206-9.
To compare the stress distributions of fixed bridge, cement-retained telescopic prostheses and extracoronal precision attachment (CEKA attachment) when connect the implants to the natural teeth, in order to find a more suitable design for it.
3-D finite element models of tooth-implant partial fixed dentures were constructed by using the ANSYS software. The partial fixed denture was supported by the second premolar and an implant (substitute the second molar). A total load of 200N was distributed to the three units of the denture in vertical and lateral (45 degree) directions.
Both of the cement-retained telescopic and the CEKA attachment made the stress of the osseous tissues surrounding the implant and the tooth declined obviously under the loads of the two directions. The stress of the cement-retained telescopic was lower under vertical load,the stress of Ceka attachment was lower under lateral load while it caused the stress of the natural tooth increasing slightly. The stress under the lateral load was higher than that under the vertical load.
Both of the cement-retained telescopic and the CEKA attachment can improve the stress distribution of tooth-implant support denture. The CEKA attachment is better under lateral loads.
比较固定桥、粘结式套筒冠义齿及冠外精密附着体（CEKA附着体）在连接种植体与天然牙时的应力分布，以便为其找到更合适的设计。
使用ANSYS软件构建牙种植体部分固定义齿的三维有限元模型。部分固定义齿由第二前磨牙和一枚种植体（替代第二磨牙）支持。将200N的总载荷沿垂直和侧向（45度）方向分布于义齿的三个单元上。
在两个方向的载荷作用下，粘结式套筒冠义齿和CEKA附着体均使种植体及牙齿周围骨组织的应力明显降低。垂直载荷下粘结式套筒冠义齿的应力较低，侧向载荷下CEKA附着体的应力较低，但其会使天然牙的应力略有增加。侧向载荷下的应力高于垂直载荷下的应力。
粘结式套筒冠义齿和CEKA附着体均可改善牙种植体支持义齿的应力分布。在侧向载荷下CEKA附着体表现更佳。
