Department of Prosthodontics, Baskent University Faculty of Dentistry, Ankara, Turkey.
Int J Oral Maxillofac Implants. 2011 Sep-Oct;26(5):961-9.
The purpose of this study was to compare the von Mises (vM), compressive, and tensile stresses occurring on implants, abutments, and surrounding bone using three-dimensional finite element analysis (FEA) in three simulations in the anterior maxilla: a single titanium implant with a titanium abutment, a single titanium implant with a zirconia abutment, and a single one-piece zirconia implant.
Three types of implants (all were 4 x 12 mm) were modeled using FEA: Astra OsseoSpeed implant with titanium abutment (ATt), Astra OsseoSpeed with zirconia abutment (ATz), and White-SKY (WS) one-piece zirconia dental implant. The anterior maxillary bone was also simulated with FEA. The implants were placed into the maxillary left central incisor region. Loading was applied horizontally and obliquely and the stresses were examined.
The vM and compressive stresses that occurred on the implant and cortical bone in the ATz model were lower than those seen in the ATt model. The tensile stress values observed in the abutment and cortical bone in the ATz and ATt models and all the stress values occurring in trabecular bone were similar. The stresses that occurred in the WS implant were lower than the stresses exerted on the ATt and ATz implants, except for tensile stresses under oblique loading.
Lower stresses occurred on the zirconia implant (WS), except for tensile stress under oblique loading. The zirconia implant generated the lowest stresses in cortical bone, and the zirconia abutment resulted in lower vM and compressive stresses than the titanium abutment in implant and cortical bone.
本研究旨在通过三种在前上颌的三维有限元分析（FEA）模拟中比较种植体、基台和周围骨上的冯·米塞斯（vM）、压缩和拉伸应力，这三种模拟分别为：带有钛基台的单个钛种植体、带有氧化锆基台的单个钛种植体和单个一体式氧化锆种植体。
使用 FEA 对三种类型的种植体（均为 4 x 12mm）进行建模：带有钛基台的 Astra OsseoSpeed 种植体（ATt）、带有氧化锆基台的 Astra OsseoSpeed 种植体（ATz）和 White-SKY（WS）一体式氧化锆牙科种植体。还通过 FEA 模拟了上颌前骨。将种植体放置在上颌左中切牙区域。施加水平和斜向载荷，并检查应力。
在 ATz 模型中，种植体和皮质骨上的 vM 和压缩应力低于 ATt 模型。在 ATz 和 ATt 模型中的基台和皮质骨中观察到的拉伸应力值以及所有在小梁骨中发生的应力值相似。在 WS 种植体中发生的应力低于在 ATt 和 ATz 种植体上施加的应力，除了斜向加载下的拉伸应力。
除了斜向加载下的拉伸应力外，氧化锆种植体（WS）上的应力较低。氧化锆种植体在皮质骨中产生的应力最低，氧化锆基台在种植体和皮质骨中产生的 vM 和压缩应力低于钛基台。
