Prosthodontist, Gumushane Sehit Ebe Kevser Ceylan Public Oral Health Center, Gumushane, Turkey.
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Ordu University, Ordu, Turkey.
J Prosthet Dent. 2018 Mar;119(3):417-425. doi: 10.1016/j.prosdent.2017.04.024. Epub 2017 Jun 20.
Narrow diameter implants were developed to allow placement in narrow alveolar ridges. Clinicians may have concerns about the durability and function of such implants.
The purpose of this finite element study was to compare the stress values occurring on the implant and at the implant bone interface after the application of the static and dynamic forces on narrow diameter, titanium and titanium-zirconia implants in the maxillary and mandibular second premolar region.
Titanium (Ti) and titanium-zirconium (Ti-Zr) narrow diameter implants (3.3 mm in diameter, 10 mm in length) were simulated in the maxillary and mandibular second premolar region, and metal-ceramic crown restorations were designed. Forces of 100 N were applied to crowns in a vertical and oblique (45-degree angle to the long axis) direction. Maximum and minimum principal stresses in the cortical and trabecular bone and the von Mises stresses and fatigue strength of the implants were evaluated with 3-dimensional finite element analysis.
In vertical and oblique static loading, Ti and Ti-Zr implants showed similar stress distribution within the same jaw models. However, the von Mises stresses in Ti-Zr implants were slightly higher than for Ti implants in all models. In oblique static and dynamic loading, all stresses were found higher than vertical loading, and fatigue failure results were found to be more critical than vertical forces.
Based on a numerical simulation, Ti and Ti-Zr alloys can be used successfully as narrow diameter implants in the second premolar area.
为了能够在狭窄的牙槽嵴中进行植入，开发了直径较细的种植体。临床医生可能会对这些种植体的耐用性和功能存在担忧。
本有限元研究的目的是比较在上颌和下颌第二前磨牙区域，静态和动态力作用于钛和钛锆窄直径种植体时，种植体和种植体骨界面上的应力值。
在上颌和下颌第二前磨牙区域模拟了直径为 3.3 毫米、长度为 10 毫米的钛（Ti）和钛锆（Ti-Zr）窄直径种植体，并设计了金属陶瓷冠修复体。在垂直和倾斜（与长轴成 45 度角）方向上向牙冠施加 100 N 的力。使用三维有限元分析评估皮质骨和小梁骨中的最大和最小主应力、von Mises 应力和种植体的疲劳强度。
在垂直和倾斜静态加载下，Ti 和 Ti-Zr 种植体在相同的颌骨模型中表现出相似的应力分布。然而，在所有模型中，Ti-Zr 种植体的 von Mises 应力略高于 Ti 种植体。在倾斜静态和动态加载下，所有的应力都比垂直加载高，疲劳失效的结果比垂直力更关键。
根据数值模拟，Ti 和 Ti-Zr 合金可以成功地用作第二前磨牙区域的窄直径种植体。
